People v. Nieves ( 2021 )


Menu:
  •         IN THE SUPREME COURT OF
    CALIFORNIA
    THE PEOPLE,
    Plaintiff and Respondent,
    v.
    SANDI DAWN NIEVES,
    Defendant and Appellant.
    S092410
    Los Angeles County Superior Court
    PA030589-01
    May 3, 2021
    Chief Justice Cantil-Sakauye authored the opinion of the
    Court, in which Justices Corrigan, Liu, Cuéllar, Kruger,
    Groban and Jenkins concurred.
    PEOPLE v. NIEVES
    S092410
    Opinion of the Court by Cantil-Sakauye, C. J.
    A jury convicted Sandi Dawn Nieves of the first degree
    murder of her daughters Nikolet Amber Nieves, Rashel Hollie
    Nieves, Kristl Dawn Folden, and Jaqlene Marie Folden (Pen.
    Code, § 187),1 attempted murder of her son, F.D. (§§ 664, 187),
    and arson (§ 451, subd. (b)). The jury found true the special
    circumstance allegations that defendant committed multiple
    murders, and that each murder was committed while lying in
    wait and while engaged in the crime of arson. (§ 190.2, subds.
    (a)(3), (a)(15), (a)(17).) Following the penalty phase of trial, the
    jury returned a verdict of death. The trial court denied
    defendant’s motion to modify the death penalty verdict and her
    motion for a new trial (§ 190.4, subd. (e)) and sentenced her to
    death. This appeal is automatic.
    We affirm Nieves’s convictions but reverse her death
    sentence due to the trial court’s misconduct.
    I.   BACKGROUND
    A. Guilt Phase Evidence
    Defendant called 911 to report a fire at her home in early
    July 1998. When paramedics arrived, the fire had been out for
    some time and defendant was covered in soot and sitting in the
    living room with her 14-year-old son F.D. Defendant’s four
    1
    All further statutory references are to the Penal Code
    unless otherwise indicated.
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    daughters, ages 12, 11, 7, and 5, were lying on sleeping bags on
    the kitchen floor and had all died of smoke inhalation. The oven
    was open with burned items inside and gasoline had been
    poured and lit in the hallway and bedrooms.
    1. Relevant relationships
    The father of F.D. and defendant’s two older daughters
    was her first husband Fernando Nieves.2 Defendant had two
    daughters with her second husband, David Folden, who
    eventually adopted her three older children. Some years later,
    as defendant was divorcing Folden, she had an affair with
    Fernando. When he ended the affair, defendant sent Fernando
    her will and life insurance policies and told him she wanted him
    to have custody of all the children if she died. Later, unhappy
    about the end of the affair, she sent an angry letter telling
    Fernando he could no longer have contact with her or the
    children.
    Defendant began seeing Scott Volk several months before
    the crime.     They dated briefly before Volk ended the
    relationship. Upset over the breakup, defendant threatened to
    commit suicide; she sent the children to stay with their fathers
    and wrote a suicide note but did not end her life. When she faced
    eviction for unpaid rent, defendant moved to the town where
    Volk lived and they eventually resumed a relationship. Volk
    broke up with defendant again after learning she was pregnant.
    2. Events surrounding the fire
    Defendant had an abortion on a Thursday the week before
    the fire. She told Volk’s mother that abortion had been out of
    2
    Given his shared surname with defendant, we will refer to
    Fernando Nieves by his first name to avoid confusion.
    2
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the question until she began to think of suicide as a solution to
    her circumstances. The weekend after the abortion, attorneys
    served defendant with notice that Folden intended to revoke his
    adoption and child support for her three older children. When
    Fernando spoke to defendant afterward, she was “furious” at the
    prospect of losing child support.
    Defendant sent a note to Folden that was postmarked on
    the day of the fire. She wrote: “Now you don’t have to support
    any of us! FUCK YOU you are scum!” In a letter to Volk that
    he received a few days after the fire, defendant wrote: “I was
    always here for you — you just couldn’t see it. Now you never
    will. [¶] I can’t live without you in my life . . . I have nothing
    left you took it all[.]”
    Defendant’s son F.D. testified that on the night of the fire
    defendant declared they would have a “slumber party” in the
    kitchen. F.D. did not want to sleep in the kitchen but defendant
    insisted. Sometime in the night during the fire, defendant shook
    F.D. and his sisters to wake them up. She told them to breathe
    into their pillows and stay where they were because the fire
    could be coming from outside. F.D. lost consciousness, but later
    got up and could see his mother and sisters lying on the floor.
    He lay down again and when he awoke it was light outside and
    his mother was up but did not answer when he asked what had
    happened.
    3. Defense case
    Defendant’s friends testified that defendant was active in
    the Mormon Church and was a caring and devoted mother.
    Defendant was very depressed after her abortion and regretted
    it. Those who spoke to defendant just before the fire said she
    3
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    was upset about recent events but had plans for the immediate
    future and did not seem to be thinking about suicide.
    When defendant testified, the prosecutor asked about her
    interview with a defense expert, whose notes showed that
    defendant reported writing letters to Folden and Volk the night
    of the fire and going to the post office to mail them at
    approximately 1:00 a.m. When testifying, defendant said she
    did not remember writing and mailing the letters or telling the
    expert about it. She claimed that she lay down near her children
    to warm her feet on the oven, woke up with no idea where the
    fire was coming from, and did not remember anything else about
    the night of the fire. She thought she dreamed about holding a
    lighter and seeing flames, but when she saw scorched hair on
    the back of her hand she realized it was not a dream.
    Defendant said she had been hysterical about having an
    abortion; subsequently, she started taking phentermine, a diet
    medication, and the antidepressant Zoloft. A toxicology report
    after the fire confirmed that defendant had phentermine in her
    system but no screen had been done for Zoloft.
    The experts who testified for the defense included two
    psychiatrists, Dr. Philip Ney and Dr. Gordon Plotkin, and a
    neuropsychologist, Dr. Lorie Humphrey.
    Dr. Ney testified that a combination of Zoloft and
    phentermine could cause serotonin syndrome, a condition
    capable of triggering seizures. Defendant’s descriptions of the
    night of the fire, and history of seizures in early childhood, were
    consistent with having had a seizure. Dr. Ney explained that a
    seizure could have induced a dissociative state, which would
    cause a person to be “basically unconscious” even while engaged
    in complex behaviors.
    4
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Dr. Plotkin confirmed that Zoloft and phentermine could
    trigger serotonin syndrome and seizures and result in delirium
    that might cause a person to do “unusual” things. On cross-
    examination, Dr. Plotkin conceded that actions such as writing
    letters and driving to the post office were not consistent with
    delirium. He testified that a seizure or serotonin syndrome
    would not cause dissociation, as Dr. Ney had claimed.
    Dr. Humphrey administered neuropsychological tests to
    assess defendant for brain damage. Results showed some
    impairment that made it harder for defendant to function under
    stress, rendered her more impulsive, and affected her memory.
    4. Rebuttal
    A psychiatrist testifying for the prosecution disputed Dr.
    Ney’s testimony that defendant was in a dissociative state on
    the night of the fire: there was too much she remembered; her
    memory was selective; and the diagnosis was inconsistent from
    one examiner to another. Prosecution experts also included a
    neurologist and a medical toxicologist, who found no evidence
    that defendant experienced serotonin syndrome, a seizure, or
    any type of unconscious state at the time of the fire. Two experts
    on psychological testing also disputed Dr. Humphrey’s
    conclusions. They found evidence that defendant tried to
    manipulate the psychological testing and identified mistakes
    and omissions throughout Dr. Humphrey’s report.
    B. Penalty Phase Evidence
    1. Prosecution case
    Fernando Nieves, his wife Charlotte Nieves, and his
    mother Minerva Serna gave victim impact statements on the
    deaths of the children and the funeral. Fernando also recounted
    how, within a month of the crimes, defendant tried to have F.D.
    5
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    removed from Fernando’s custody and sent to live with a
    maternal relative in Indiana whom F.D. had never met. Serna
    expressed her belief during cross-examination that defendant
    was “vicious and malicious” in the way she had tried to break up
    Fernando’s relationships and keep him from seeing his children.
    David Folden described coping with his daughters’ deaths
    and his resentment at defendant’s efforts to turn her older
    children against him. He felt that one thing F.D. gained from
    the deaths of his sisters was freedom — his mother had been so
    controlling she would not even let the children play in the front
    yard.
    In addition to victim impact testimony, the prosecution
    showed a video of defendant’s children playing in various
    settings and displayed poster boards mounted with photographs
    of the victims engaged in activities with family members.
    2. Defense case
    The defense presented one expert witness, Dr. Robert
    Suiter, who evaluated defendant and Folden during their
    divorce proceedings. He explained his recommendation from
    that time, approximately a year before the crime, that defendant
    was best suited to have custody of the children.
    Character witnesses included a number of defendant’s
    friends, defendant’s maternal aunt, stepfather, and a bishop
    from defendant’s church. They described defendant’s mother as
    verbally and physically abusive during defendant’s childhood
    and noted that defendant had experienced previous periods of
    severe depression.     Defendant’s life revolved around her
    children and she was an active and loving mother. The
    witnesses believed defendant could not have been in her right
    mind if she killed her children; they concluded she must have
    6
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    been very depressed and viewed her as a “good mother who lost
    touch with reality.”
    A chaplain from the county jail testified concerning
    defendant’s remorse and her desire to repair her relationship
    with her son.
    3. Rebuttal
    The prosecution introduced a letter to defendant from one
    of her daughters who threatened to run away and expressed
    feeling ignored and unloved. Testimony from a neighbor and
    staff from the victims’ school characterized defendant as a
    controlling, overbearing, and manipulative parent whose
    children seemed to fear her. Neighbors who knew defendant
    and Folden during their divorce concluded that defendant lied
    about the relationship and tried to turn her children against
    Folden.     Defendant seemed extremely angry, especially
    regarding Folden.
    II.   DISCUSSION
    A. Jury Selection
    Defendant contends the trial court erred by conducting
    voir dire that was inadequate to reveal prospective jurors’
    disqualifying attitudes about the death penalty in violation of
    her Fifth, Sixth, Eighth, and Fourteenth Amendment rights.
    Specifically, defendant claims the jury questionnaire was
    deficient because it omitted defense questions about the impact
    that evidence concerning young victims would have on
    prospective jurors’ decisionmaking, and it used questions that
    were too confusing to elicit meaningful information about
    prospective jurors’ views. Defendant also contends the trial
    court’s “rushed” voir dire and restrictions on defense
    questioning was inadequate to inform defendant’s exercise of
    7
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    challenges for cause and use of peremptory challenges. We find
    no merit to these claims.
    1. Background
    The trial court prepared a jury questionnaire that
    incorporated proposals from defense and prosecution drafts.
    The defense proposed amendments to the court’s draft
    questionnaire, addressing case-specific issues such as the
    impact of unpleasant photographs and defendant’s abortion.
    The defense also requested additional questions about whether
    a crime involving four young victims would cause prospective
    jurors to vote for the death penalty regardless of mitigating
    evidence. The trial court incorporated most of the defense
    amendments but rejected additional questions about the age of
    the victims, which was instead referenced in a preamble to
    questions about the death penalty.
    The trial court rejected a defense motion to include two
    revised questions referencing the age of the victims but agreed
    to defense counsel’s alternate request to have bolded references
    to the victims’ ages appear in close proximity to particular
    questions. The defense then expressed agreement with two
    bolded references to the victims’ ages and their location in the
    questionnaire.
    The final jury questionnaire contained eleven death
    penalty questions. Question Nos. 60 to 63 asked if prospective
    jurors felt the death penalty was used too much or too little, had
    changed their view on the death penalty over the years, or
    belonged to groups that advocated increased use or abolition of
    the death penalty. After question No. 63, the questionnaire
    explained the guilt and penalty phases of a capital trial,
    informed     prospective      jurors     concerning       the   special
    8
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    circumstances defendant faced, and explained the jury’s
    responsibility to determine the penalty.    The guidance
    concluded in bolded print set apart from the preceding
    paragraph: “Also assume for the purposes of questions 64–
    67, that the evidence may tend to show that the four
    deceased victims were the children of the defendant and
    ranged in age from age five to age twelve.”
    Question Nos. 64 to 66 asked whether prospective jurors
    would, because of their views on capital punishment, refuse to
    find the defendant guilty of first degree murder or special
    circumstances to avoid deliberating on a penalty phase, or if
    they would automatically vote for life without parole without
    considering any aggravating or mitigating factors. Appearing a
    second time in bold print directly before question No. 67 was the
    instruction: “Assume for purposes of question 67 that the
    evidence may tend to show that the four deceased
    victims were the children of the defendant and ranged in
    age from age five to age twelve.”
    Question No. 67 asked if prospective jurors would
    automatically vote for the death penalty: “Assume for the sake
    of this question only, that the jury has found the defendant
    guilty of first degree murder and has found one or more of the
    special circumstances true and that you are in the penalty
    phase. Would you, because of any views that you may have
    concerning capital punishment, automatically refuse to vote in
    favor of the penalty of life imprisonment without the possibility
    of parole and automatically vote for a penalty of death, without
    considering any of the evidence, or any of the aggravating and
    mitigating factors (on which you will be instructed) regarding
    the facts of the crime and the background and character of the
    defendant?”
    9
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The remaining questions asked prospective jurors:
    whether those who would automatically vote for a particular
    penalty would change their approach if ordered by the court to
    consider and weigh the evidence and the aggravating and
    mitigating factors; whether they could set aside their feelings
    about what the law ought to be and follow the law as instructed
    by the court; and what they understood the meaning of life in
    prison without the possibility of parole to be.
    The jury questionnaire instructed prospective jurors to
    mark questions they did not understand with a question mark
    or by writing “I don’t understand” and informed them that the
    trial court and counsel would question them about any
    difficulties they had filling out the questionnaire. Before
    prospective jurors filled out the questionnaire, the trial court
    orally advised them to mark the questionnaire when they did
    not understand something or wanted to answer in a confidential
    manner, provided them a written summary of the charges,
    explained trial court procedures for death penalty cases in
    California and the jury’s role in determining the penalty, and
    verbally reiterated that the charges included the murder of
    children.
    For oral voir dire, the trial court required the parties to
    submit any proposed followup questions in writing, and the trial
    court then determined whether to include them in the oral
    examination. The court did not intend to question prospective
    jurors about their views on the death penalty when no basis for
    disqualification appeared in their questionnaires.
    The trial court identified for individual questioning
    prospective jurors whose questionnaire answers appeared
    facially disqualifying or raised questions about death
    10
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    qualification. Defense counsel identified additional prospective
    jurors for questioning based on their questionnaires. The trial
    court then individually questioned these prospective jurors in
    the jury box. The defense participated in questioning a majority
    of the prospective jurors, though there were some for whom the
    court completed questioning without defense input, and others
    the defense did not question, although offered an opportunity to
    do so.
    During selection of the sitting jury, the trial court excused
    nine prospective jurors for cause based on their views about the
    death penalty, five who would always vote for the death penalty,
    and four who would always vote against it. The court also
    excused some prospective alternate jurors for cause, and no
    alternate jurors ultimately deliberated in defendant’s trial.3
    The defense used 13 of its 20 peremptory challenges.
    2. Analysis
    Prospective jurors are disqualified from serving on a
    capital jury when their views about capital punishment would
    prevent or substantially impair the performance of their duties
    in accordance with their instructions and oath. (Wainwright v.
    Witt (1985) 
    469 U.S. 412
    , 424 (Witt).) This standard does not
    require bias to be “ ‘unmistakably clear’ ” and is met when “the
    trial judge is left with the definite impression that a prospective
    juror would be unable to faithfully and impartially apply the
    law.” (Id. at pp. 425–426.) A trial court’s ruling in this regard
    is entitled to deference given its ability to consider demeanor, “a
    3
    Any error in excluding a prospective alternate juror for his
    or her views on capital punishment is harmless beyond a
    reasonable doubt when no alternate juror participates in jury
    deliberations. (People v. Jones (2012) 
    54 Cal.4th 1
    , 44–45.)
    11
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    factor of critical importance in assessing the attitude and
    qualifications of potential jurors.” (Uttecht v. Brown (2007) 
    551 U.S. 1
    , 9.)
    Under the two-part inquiry of Lockhart v. McCree (1986)
    
    476 U.S. 162
    , it is important to consider not only whether a
    prospective juror’s views on capital punishment would
    “generally lead to an automatic vote, one way or the other,” but
    also “the possibility that such a juror might be able to set aside
    those views and fairly consider both sentencing alternatives, as
    the law requires.” (People v. Leon (2015) 
    61 Cal.4th 569
    , 592
    (Leon); see also Lockhart, at p. 176.) “A juror might find it very
    difficult to vote to impose the death penalty, and yet such a
    juror’s performance still would not be substantially impaired
    under Witt, unless he or she were unwilling or unable to follow
    the trial court’s instructions.”      (People v. Stewart (2004)
    
    33 Cal.4th 425
    , 447, italics omitted; People v. Armstrong (2019)
    
    6 Cal.5th 735
    , 764.)
    To ensure meaningful and reliable death-qualifying voir
    dire, “both the [trial] court and counsel ‘must have sufficient
    information regarding the prospective juror’s state of mind,’. . .
    [citation],” though the trial court retains “broad discretion over
    the number and nature of questions about the death penalty.”
    (People v. Stitely (2005) 
    35 Cal.4th 514
    , 540; see also People v.
    Amezcua and Flores (2019) 
    6 Cal.5th 886
    , 901.) Ultimately,
    death-qualification voir dire “must not be so abstract that it fails
    to identify those jurors whose death penalty views would
    prevent or substantially impair the performance of their duties
    as jurors in the case being tried” and “it must not be so specific
    that it requires the prospective jurors to prejudge the penalty
    issue based on a summary of the mitigating and aggravating
    evidence likely to be presented.” (People v. Cash (2002)
    12
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    
    28 Cal.4th 703
    , 721–722.) In striking this balance, the trial
    court may not categorically deny the defense an opportunity to
    inform prospective jurors of case-specific factors that could
    invariably cause them to vote for death. (People v. Carasi (2008)
    
    44 Cal.4th 1263
    , 1287 (Carasi); Cash, at p. 721.) Unless voir
    dire is so inadequate as to render the ensuing trial
    fundamentally unfair, it is not a basis for reversal. (People v.
    Salazar (2016) 
    63 Cal.4th 214
    , 235.)
    a. Adequacy of the juror questionnaire
    Defendant claims the questionnaire should have included
    specific inquiries about the impact of young victims on
    prospective jurors’ decisionmaking and more questions about
    the death penalty in general. She also argues that the questions
    posed were too confusing to uncover bias.
    Preliminarily, the People argue that defense counsel’s
    willingness to do away with or significantly limit use of a jury
    questionnaire at trial constitutes invited error. Although
    defense counsel did agree to dispose of the questionnaire, the
    trial court rejected this approach and proceeded to create a
    questionnaire with the input of both parties. The record
    therefore does not establish that “ ‘defense counsel intentionally
    caused the trial court to err,’ ” and no invited error appears.
    (People v. Coffman and Marlow (2004) 
    34 Cal.4th 1
    , 49.)
    The People also contend that defendant forfeited claimed
    inadequacies in the jury questionnaire by failing to object to
    them. Defendant argues that the defense continued objecting to
    the questionnaire and attempted to question jurors about the
    effect of young victims on their decisionmaking. In this context,
    defense counsel’s concession to using the questionnaire after his
    efforts to limit and amend it failed does not forfeit defendant’s
    13
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    claim that the trial court erred in omitting proposed defense
    questions. (People v. Landry (2016) 
    2 Cal.5th 52
    , 83.)
    A trial court’s discretion regarding the scope of voir dire
    extends to the wording of the questionnaire. (Leon, supra,
    61 Cal.4th at p. 586.) Here, “[w]here the court exercises its
    discretion to exclude certain questions from the questionnaire,
    we will affirm unless the voir dire was so inadequate that the
    resulting trial was fundamentally unfair.” (Ibid.) We find no
    such inadequacy. The final questionnaire conveyed sufficient
    case-specific information, twice instructing prospective jurors to
    consider the number and age of the victims when answering
    death-qualification questions — facts the trial court also
    highlighted in oral instructions regarding the questionnaire.
    After receiving these case-specific factors before death
    qualification, it is “logical to assume” that when prospective
    jurors are asked whether they would automatically vote for life
    or death, “they have answered the question with those case-
    specific factors in mind.” (Carasi, 
    supra,
     44 Cal.4th at p. 1287;
    see also Leon, at p. 587.)
    Defendant argues that the questionnaire did not elicit
    sufficient information about death qualification, comparing the
    number and types of questions in her questionnaire to more
    extensive model questioning endorsed by the Judicial Council
    after defendant’s trial. In People v. Covarrubias (2016) 
    1 Cal.5th 838
    , we addressed challenges to excusals for cause based on
    written questions that were identical to question Nos. 66
    through 69 on defendant’s jury questionnaire. (Id. at pp. 861–
    862.) There, we determined that the trial court’s handling of
    ambiguous responses to the questions was error but recognized
    that the questions themselves “called for responses that could
    adequately inform the trial court whether a prospective juror
    14
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    was substantially impaired within the meaning of Witt.” (Id. at
    p. 864.) Although subsequent formulations may have expanded
    upon these questions, we accept, as we did in Covarrubias, that
    they were adequate for assessing prospective jurors’ views about
    the death penalty.
    Defendant also contends that the death qualification
    questions were “practically unintelligible,” citing problems such
    as compound questions, confusing language, and “legalese”
    above the education level of most prospective jurors. The People
    are correct that defendant did not object to the wording of
    questions as compound or confusing, and any claimed
    inadequacies on that basis have thus been forfeited. Even if
    preserved, the claim would not establish error.
    Defendant cites United States v. Littlejohn (D.C. Cir. 2007)
    
    489 F.3d 1335
    , 1341–1342, and Cabe v. Superior Court (1998)
    
    63 Cal.App.4th 732
    , 742, in support of her argument that the
    questionnaire was confusing; however, problems with compound
    questions addressed in those cases were not present in
    defendant’s questionnaire.
    Defendant also points to prospective jurors who left death-
    qualification questions blank or could not answer questions as
    an indication that the questionnaire must have caused
    confusion. The examples defendant cites are unconvincing.
    Some of the prospective jurors who failed to answer death-
    penalty questions had trouble throughout the questionnaire,
    reflecting a broader difficulty not specific to the death-
    qualification questions. One prospective juror who left some
    questions blank responded to other, more complex, questions to
    indicate that she would automatically vote for the death
    penalty, a position she reiterated in oral voir dire. Another
    15
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    prospective juror did not answer questions “yes” or “no” as
    prompted but gave narrative responses reflecting her
    uncertainty. The record thus reflects difficulties that, “ ‘ “[g]iven
    the juror’s probable unfamiliarity with the complexity of the
    law, coupled with the stress and anxiety of being a prospective
    juror in a capital case, . . . should be expected.” ’ ” (People v.
    Wilson (2008) 
    44 Cal.4th 758
    , 779.)
    The questionnaire also accounted for the fact that some
    prospective jurors might find it confusing and instructed them
    to mark questions they did not understand so that the trial court
    and counsel could address them in individual voir dire. The
    record shows that whether marked or not, the trial court
    individually questioned prospective jurors about missing,
    incomplete, or equivocal responses, an appropriate approach to
    an adequate voir dire. (People v. Robinson (2005) 
    37 Cal.4th 592
    , 618.)
    Defendant also asserts that the wording of question
    No. 67, which asked whether prospective jurors would
    “automatically vote for a penalty of death, without considering
    any of the evidence,” was inadequate to identify unqualified,
    death-oriented jurors. Defendant argues that the disqualifying
    condition in question No. 67 — voting without “considering”
    evidence — was more stringent than the appropriate standard
    of automatically voting “regardless of” the evidence. This claim
    of deficiency is not persuasive.
    The standard enunciated in Witt recognizes that “[a] juror
    who will automatically vote for the death penalty in every case
    will fail in good faith to consider the evidence of aggravating and
    mitigating circumstances as the instructions require him to do.”
    (Morgan v. Illinois (1992) 
    504 U.S. 719
    , 729, italics added.)
    16
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Although the wording used in defendant’s questionnaire is
    consistent with this standard, and past model juror
    questionnaires in California have relied on the same phrase
    (People v. Stewart, supra, 33 Cal.4th at p. 447, fn. 12), the high
    court has also explained that “[r]elevant voir dire questions
    addressed to [death qualification] need not be framed
    exclusively” by reference to “a particular verb” (Witt, 
    supra,
     469
    U.S. at pp. 433–434). The trial court’s questionnaire here
    adequately reflected the proper standard.
    b. Adequacy of oral voir dire
    Defendant contends that the trial court’s “rushed” voir
    dire denied the defense an opportunity to learn about
    prospective jurors’ potential biases, prevented the selection of
    an impartial jury, and resulted in an inadequate record
    concerning the ensuing grant or denial of challenges for cause.
    Defendant also contends the trial court erred by denying defense
    efforts to ask direct questions about whether prospective jurors’
    ability to vote for a life or death sentence would be affected by
    crimes involving a mother’s murder of her four children. We
    reject these claims.
    As evidence of a generally “cursory” voir dire, defendant
    points to the length of death qualification, which took somewhat
    less than two days.         We have determined that death
    qualification lasting “approximately three hours and 20
    minutes” was not “unduly rapid or otherwise improper” where
    the record showed that the trial court was “merely efficient.”
    (People v. Robinson, 
    supra,
     37 Cal.4th at p. 618.) Nothing in the
    length of the death qualification of defendant’s jury, standing
    alone, points to inadequate voir dire.
    17
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Defendant asserts the trial court’s limitations on defense
    questioning during voir dire prevented adequate examination of
    prospective jurors’ views. In one instance defendant cites, the
    trial court found Prospective Juror No. 7166’s written answers
    concerning the death penalty questions sufficient for death
    qualification where he responded unequivocally that he would
    not automatically vote for life or death, his other answers were
    not disqualifying, and his only written remark was that the
    “punishment should fit the crime.” The court denied defense
    counsel’s request to ask the prospective juror whether the
    nature of the crimes in defendant’s case would cause him to
    automatically vote for the death penalty.
    We have observed that “parsimony in death qualification
    voir dire is not commendable.” (Leon, supra, 61 Cal.4th at
    p. 589; see also People v. Cash, 
    supra,
     28 Cal.4th at p. 721.)4
    Recognizing, however, that “the trial court has broad discretion
    over the number and nature of questions about the death
    penalty,” we have found no error where courts have relied
    heavily on general questions tracking death qualification
    standards and when “the court and/or counsel asked additional
    questions to clarify ambiguous responses.” (People v. Stitely,
    supra, 35 Cal.4th at p. 540.) Here, the prospective juror’s
    responses to adequate written questions were not ambiguous
    and the questionnaire twice instructed him to consider the
    4
    At the time of defendant’s trial, Code of Civil Procedure
    former section 223 dictated voir dire be conducted by the trial
    court, with supplemental questioning from the parties allowed
    upon a showing of good cause; later amendments to the statute
    allowed “each party an expanded but not unlimited right to
    examine prospective jurors through direct oral questioning.”
    (People v. Salazar, supra, 63 Cal.4th at p. 233, fn. 10.)
    18
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    nature of the charged crimes when answering. The trial court
    did not abuse its discretion by declining to repeat questions in
    oral voir dire that had already been answered. “Counsel are
    entitled to ascertain a prospective juror’s true views on the
    death penalty. Once those views have been made clear, the
    court is not obliged to question them further.”               (People v.
    Salazar, supra, 63 Cal.4th at p. 236.)
    Defendant claims the trial court also prevented adequate
    voir dire of Prospective Juror Nos. 3801 and 8318, who gave
    equivocal answers. Defendant relies on United States v.
    Gonzalez (9th Cir. 2000) 
    214 F.3d 1109
    , 1114, to support her
    argument that equivocal answers are not sufficient to dispel
    potential bias. This federal decision is not binding on us and
    does not relate to death qualification; it addressed standards for
    reviewing bias in a non-capital case under circumstances not
    present here.
    A trial court’s ruling on a prospective juror’s death
    qualification “ ‘may be upheld even in the absence of clear
    statements from the juror that he or she is impaired because
    “many veniremen simply cannot be asked enough questions to
    reach the point where their bias has been made ‘unmistakably
    clear.’ ” ’ ” (People v. Wilson, 
    supra,
     44 Cal.4th at p. 779.)
    “ ‘ “ ‘On review, if the juror’s statements are equivocal or
    conflicting, the trial court’s determination of the juror’s state of
    mind is binding.’ ” ’ ” (People v. Winbush (2017) 
    2 Cal.5th 402
    ,
    429; see 
    id.
     at pp. 427–428.) The trial court did not limit defense
    questioning of Prospective Juror No. 8318, who indicated that
    she would have difficulty imposing the death penalty. The trial
    court also allowed defense questioning of Prospective Juror
    No. 3801, who was not sure she could consider a life sentence
    but would “try.” We find the trial court’s voir dire in these
    19
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    instances adequate and defer to its determination of the
    prospective jurors’ qualifications, as we must.
    Finally, defendant argues that voir dire was inadequate
    because the trial court was unwilling to allow additional oral
    questioning regarding prospective jurors’ views in light of the
    number and age of the victims. We reject this claim. The trial
    court orally advised prospective jurors of the number and age of
    the victims and the questionnaire itself prominently conveyed
    that information. Accordingly, the court could properly assume
    the jurors had those factors in mind when asked, either orally
    or in writing, whether they would automatically vote for life or
    death. (Carasi, supra, 44 Cal.4th at p. 1287.)
    The record demonstrates that voir dire in defendant’s case
    was not so cursory that it constituted an abuse of discretion or
    deprived her of a fundamentally fair trial. The trial court
    properly “err[ed] on the side of caution” to question prospective
    jurors whose responses to the written questionnaire were
    ambiguous or potentially disqualifying. (People v. Wilson,
    
    supra,
     44 Cal.4th at p. 790.)
    B. Guilt Phase Issues
    1. Access to impeachment evidence
    Defendant contends the trial court erred by refusing to
    enforce defense subpoenas for records and witnesses related to
    her son’s statements and mental health following the fire. She
    argues the trial court’s errors violated Evidence Code section
    912, as well as her Sixth and Fourteenth Amendment rights.
    We conclude there was no error.
    20
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    a. Background
    Before trial, defendant issued subpoenas for F.D.’s mental
    health records to a Dr. Jacobs, and to county social workers who
    interviewed F.D. and his father after the fire.
    During a hearing in which he asserted F.D.’s privilege to
    prevent disclosure of records from Dr. Jacobs, Fernando Nieves
    testified that he took F.D. and other family members to the
    doctor for therapy following the deaths of F.D.’s sisters. When
    defendant petitioned to have F.D. removed from Fernando’s
    custody, Dr. Jacobs wrote a letter to the dependency court on
    behalf of Fernando; the letter provided brief observations about
    F.D.’s adjustment to living with Fernando’s family and noted
    F.D.’s desire remain with them. By the time of defendant’s trial,
    Fernando had been named F.D.’s legal guardian.
    The trial court rejected defendant’s argument that
    Fernando waived F.D.’s psychotherapist-patient privilege by
    having Dr. Jacobs submit a letter to the dependency court and
    found no defense interests sufficient to override the privilege.
    F.D. later testified in the prosecution’s case-in-chief and was
    excused subject to recall.
    When counsel for the social workers appeared to oppose
    defense counsel’s subpoena for their records, the trial court
    ruled that section 827 of the Welfare and Institutions Code
    required defendant to petition the juvenile court for access to the
    records. The defense filed a petition with the juvenile court a
    few days later. When the social workers later responded to
    subpoenas to testify for the defense, they again asserted state
    confidentiality protections. Defense counsel provided the trial
    court with a copy of the social workers’ report but declined to
    21
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    elaborate on how their testimony was relevant, and the trial
    court sustained the claims of confidentiality.
    Later in the trial, defense counsel announced that the
    juvenile court had granted his petition for access to records from
    the social workers and Dr. Jacobs. When the defense sought to
    impeach the rebuttal testimony of Fernando Nieves with
    statements from the social workers’ report, the trial court
    sustained the prosecution objection that the witness’ prior
    statements could not be used because they did not qualify as
    inconsistent statements.
    b. Analysis
    A patient has a privilege to refuse to disclose, and to
    prevent another from disclosing, a confidential communication
    between the patient and his or her psychotherapist. (Evid.
    Code, §§ 1014, 1012.) Waiver of the privilege occurs when the
    holder of the privilege has disclosed a significant part of the
    communication or consented to disclosure. (Evid. Code, § 912,
    subd. (a).) The “ ‘holder of the privilege’ ” is the patient, or a
    guardian or conservator of the patient. (Evid. Code, § 1013.)
    A person invoking the psychotherapist-patient privilege has the
    initial burden of showing that the privilege is presumptively
    applicable. The burden then shifts to the party seeking
    disclosure to establish that the privilege is inapplicable. (People
    v. Gonzales (2013) 
    56 Cal.4th 353
    , 372.) The psychotherapist-
    patient privilege is to be liberally construed in favor of the
    patient. (People v. Wharton (1991) 
    53 Cal.3d 522
    , 554.)
    Section 827 of the Welfare and Institutions Code contains
    protections concerning the confidentiality of juvenile records,
    whether or not they are covered by other state or federal
    privileges, and vests the juvenile court with exclusive authority
    22
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    to determine the extent to which those records may be released
    to third parties. (Welf. & Inst. Code, § 827; T.N.G. v. Superior
    Court (1971) 
    4 Cal.3d 767
    , 778.)
    When a defendant proposes to impeach a critical
    prosecution witness with privileged information, the trial court
    may be called upon to balance the defendant’s rights under the
    Sixth Amendment to access such material at trial against the
    state policies supporting the privilege. (Davis v. Alaska (1974)
    
    415 U.S. 308
    , 319; People v. Hammon (1997) 
    15 Cal.4th 1117
    ,
    1127 (Hammon).) In Hammon, we concluded that a Sixth
    Amendment right to access protected information does not
    extend to pretrial disclosure, given the possibility that
    subsequent developments may eliminate the justification for
    invading a patient’s statutory privilege. (Ibid.)
    Defendant concedes that the Sixth Amendment does not
    confer a right to discover privileged psychiatric records before
    trial. (Hammon, supra, 15 Cal.4th at p. 1128.) She argues
    instead that F.D.’s father waived the privilege for family
    therapy records when he asked Dr. Jacobs to submit a letter in
    connection with dependency proceedings. The trial court did not
    err in sustaining the psychotherapist-patient privilege with
    regard to these records.
    The letter from Dr. Jacobs to the dependency court did not
    disclose a “significant part” of communications between F.D.
    and his doctors that would constitute waiver. (Evid. Code, § 912,
    subd. (a).) But even if there had been a significant disclosure of
    protected communications, we would not conclude on this record
    that F.D. or his legal guardian consented to it. When, as here,
    a guardian ad litem is required for dependency proceedings (In
    re Josiah Z. (2005) 
    36 Cal.4th 664
    , 679), we would not assume
    23
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    that Fernando Nieves, or defendant, could legally waive the
    psychotherapist-patient privilege during their custody dispute
    (see In re Cole C. (2009) 
    174 Cal.App.4th 900
    , 911, fn. 3), and
    disclosure by Dr. Jacobs did not otherwise constitute waiver
    (Roberts v. Superior Court (1973) 
    9 Cal.3d 330
    , 341).
    Defendant contends the trial court violated her Sixth
    Amendment and due process rights by preventing her from
    impeaching F.D. with records or testimony from the social
    workers. Defendant failed to preserve these constitutional
    claims. They also lack merit.
    Defendant argues that the trial court should have
    reviewed the social workers’ records to determine their
    materiality to the defense, citing Pennsylvania v. Ritchie (1987)
    
    480 U.S. 39
    , 58–60 and People v. Webb (1993) 
    6 Cal. 4th 494
    ,
    517. In Webb, we recognized that due process requires the
    government to provide a defendant with material exculpatory
    evidence in its possession even when it is subject to a state
    privacy privilege. (Id. at p. 518.) Those principles do not apply
    here, however, where defendant already had the social workers’
    report. We discern no error in the trial court’s ruling “when
    defendant made no offer of proof at trial explaining why the
    witness[es] should have been permitted to [testify].” (People v.
    Lightsey (2012) 
    54 Cal.4th 668
    , 727, fn. omitted; see also Evid.
    Code, § 354 (a); People v. Case (2018) 
    5 Cal.5th 1
    , 44–45.)
    Defendant argues that the trial court continued to sustain
    confidentiality protections after the juvenile court granted
    defendant’s petition for disclosure of the social workers’ report,
    denying her the opportunity to introduce impeachment
    evidence. The record does not bear this out. After the juvenile
    court’s ruling, defendant did not try to use the report to impeach
    24
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    F.D. at all, though he was still subject to recall. (People v.
    Johnson (2018) 
    6 Cal.5th 541
    , 583 [inconsistent out-of-court
    statement admissible when witness is subject to recall].) The
    defense did attempt to use the report to impeach Fernando
    Nieves, but rather than resolving that effort based on
    confidentiality protections, the trial court ruled that the prior
    statements were not inconsistent.
    We also reject defendant’s claim that the trial court erred
    by allowing the prosecution to address questions of privilege
    related to F.D.’s records. We have held that a trial court may
    entertain argument from the opposing party on third party
    discovery and that a prosecutor’s submission of argument in
    such a matter — as occurred in defendant’s trial — is not
    improper. (People v. Superior Court (Humberto S.) (2008)
    
    43 Cal.4th 737
    , 750–754; see also Facebook, Inc. v. Superior
    Court (Touchstone) (2020) 
    10 Cal.5th 329
    , 358 [reiterating
    legitimate role of prosecution concerning third party discovery
    disputes].)
    Defendant argues that, as a witness for the prosecution,
    Fernando Nieves had a conflict of interest that should have
    disqualified him from asserting a privilege on behalf of F.D.
    Defendant did not raise this issue at trial and thus forfeits it on
    appeal. Defendant also argues that she should have been
    granted access to F.D.’s records based on her status as his
    parent. (Fam. Code, § 3025 [non-custodial parents may access
    minor child’s records].) We have no need to examine this claim
    when the record shows that defendant either obtained the
    records she sought or was entitled to access them by order of the
    juvenile court.
    25
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    2. Compelled psychological testing of defendant
    Defendant contends the trial court erred by requiring her
    to submit to psychological examination by prosecution experts
    and rejecting her request to have a defense expert attend that
    examination. Defendant argues that after she declined to
    submit to the examination, the trial court further erred by
    instructing the jury concerning her refusal and by allowing the
    prosecution to comment on it. We reject each of these claims.
    a. Background
    Before trial, the defense conducted evaluations of
    defendant and provided the prosecution with reports from six
    defense experts. The trial court executed orders pursuant to
    Evidence Code section 730 authorizing the appointment of four
    prosecution experts to interview defendant, analyze test results
    from defense experts, and provide other assistance to the
    prosecution.
    When the parties addressed defendant’s examination by
    prosecution experts, defendant agreed to submit to the
    examinations provided that a defense expert could be present to
    observe them. The trial court held a hearing to address the
    implications of having a defense representative present during
    prosecution interviews and concluded that such presence would
    be unnecessary, inappropriate, and might invalidate
    prosecution expert results.
    Defense counsel did not object to the examination by
    prosecution experts but continued to argue for the presence of a
    defense expert. The trial court reiterated its order that
    defendant was required to submit to interviews without defense
    monitoring at those interviews and ultimately found that the
    26
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    continued defense objections constituted a refusal by defendant
    to be examined.
    The prosecution later proposed an instruction regarding
    defendant’s refusal: if jurors found defendant had refused to
    submit to prosecution examinations, they could consider that as
    consciousness of any required mental state. The trial court said
    that if the prosecution wanted such an instruction, the jury
    would need to hear evidence of refusal, which could be
    established through testifying witnesses.
    Over objections, a prosecution expert testified that he had
    been told that defendant refused to be evaluated by him. On
    cross-examination, the defense attempted to ask the expert
    whether he would have any concerns about the conditions
    defendant requested for examination by a prosecution expert.
    The trial court sustained objections to this questioning and
    admonished the jury: “I am going to tell the jury at this point
    that the defendant — when the defendant submits their mental
    state as an issue in the case, the defendant must submit to
    examination by the prosecution experts without any conditions.
    That was not forthcoming this this case.” Two more prosecution
    experts then testified that defendant refused their requests for
    an examination.
    Ultimately, the trial court rejected instructions submitted
    by the defense and prosecution seeking to address defendant’s
    response to examinations by prosecution experts and concluded
    that the issue was a matter for argument to the jury. During
    closing argument, the prosecution repeated the court’s
    comments that defendant was required to submit to
    examination by prosecution experts and, without objection,
    argued that her refusal could be viewed as an attempt to
    27
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    suppress or conceal evidence, affect the weight given to defense
    expert opinions, and undermine the validity of defense claims.
    b. Analysis
    In Verdin v. Superior Court (2008) 
    43 Cal.4th 1096
    (Verdin), we held that courts may not compel a defendant’s
    mental examination by a prosecution expert unless “authorized
    by some . . . ‘express statutory provision[]’ (§1054, subd. (e).)”
    (Id. at p. 1109.) This ruling applies retroactively to defendant’s
    trial in 2000. (People v. Clark (2011) 
    52 Cal.4th 856
    , 939.) “We
    have made clear that even in cases governed by Verdin, trial
    courts had the power to order defendants to submit to a
    psychological examination by a court-appointed expert pursuant
    to Evidence Code section 730.” (People v. Banks (2014)
    
    59 Cal.4th 1113
    , 1193, italics omitted.)
    Defendant claims the trial court did not have authority
    under Penal Code section 1054 to order her examination by
    prosecution experts. The record shows, however, that the trial
    court exercised its authority under Evidence Code section 730,
    an appropriate basis for compelling her psychological
    examination. (People v. Banks, supra, 59 Cal.4th at p. 1193.)
    Defendant insists the trial court also erred by requiring
    her to submit to an “unconditional” examination, one without a
    defense representative present. We have recognized that the
    presence of defense counsel or other third parties during a court-
    ordered psychological examination may invalidate its results (In
    re Spencer (1965) 
    63 Cal.2d 400
    , 411; Edwards v. Superior Court
    (1976) 
    16 Cal.3d 905
    , 911) and have concluded that the presence
    of counsel at such an examination is not constitutionally
    required (In re Spencer, at p. 412; People v. Ledesma (2006)
    
    39 Cal.4th 641
    , 698 (Ledesma)). The trial court therefore did not
    28
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    abuse its discretion by rejecting defendant’s request to have a
    defense expert present.
    We also reject defendant’s argument that the trial court’s
    admonition and the prosecutors’ arguments violated her
    constitutional rights and her rights under Evidence Code
    section 913.5 Once defendant placed her mental state at issue,
    she waived her Fifth and Sixth Amendment rights to object to
    the prosecution examinations. (People v. Gonzales (2011)
    
    51 Cal.4th 894
    , 929.) Subsequent testimony about defendant’s
    refusal to cooperate did not violate those rights (People v.
    McPeters (1992) 
    2 Cal.4th 1148
    , 1190), and the jury could
    properly consider the refusal (People v. Carpenter (1997)
    
    15 Cal.4th 312
    , 413).
    Defendant argues the trial court erred by failing to
    instruct the jury that her refusal was insufficient to establish
    guilt, and that this had the effect of lessening the prosecution’s
    burden. Defendant forfeited this claim by failing to request a
    clarifying instruction at trial (People v. Guerra (2006) 
    37 Cal.4th 1067
    , 1134), but it would nonetheless fail on the merits. The
    trial court properly instructed the jury concerning the
    reasonable doubt standard and there is no reasonable likelihood
    the jury would have interpreted the trial court’s limited
    comment to indicate that defendant’s refusal to submit to
    examination was sufficient to prove her guilt. (Ibid.)
    Defendant also claims that the trial court erred by
    allowing the prosecution to reference defendant’s refusal during
    5
    Evidence Code section 913 provides that no comment can
    be made or inference drawn from the invocation of a privilege
    not to testify or to disclose any matter. (Evid. Code, § 913, subd.
    (a).)
    29
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    closing argument. This argument is forfeited by defendant’s
    failure to object at trial (People v. Gamache (2010) 
    48 Cal.4th 347
    , 372), and in any event it lacks merit. The prosecutor
    argued that evidence of defendant’s refusal was relevant to the
    weight of defense expert testimony, a consideration we have
    recognized as proper. (People v. Carpenter, 
    supra,
     15 Cal.4th at
    p. 412.) Defendant cites no authority for her view that she did
    not personally refuse to be examined, and she offers no reason
    to dispel the general rule that absent complaint at trial, the acts
    of her counsel are imputed to her. (People v. Marsden (1970)
    
    2 Cal.3d 118
    , 125.)
    3. Scope of expert testimony
    Defendant contends the trial court imposed limitations on
    mental health testimony by defense experts in violation of her
    federal constitutional rights to a fair trial, to present a defense,
    and to a reliable penalty determination. Specifically, she claims
    the court erred by striking testimony by arson expert Del
    Winter, precluding other experts from relying on hearsay
    statements about her background, and sustaining objections to
    testimony about her mental condition at the time of the fire
    pursuant to Penal Code sections 28 and 29.6 We assume some
    error only concerning the court’s mental state rulings but find it
    harmless.
    a. Background
    The trial court struck a portion of testimony by defense
    expert Del Winter, a retired fire investigator. Winter testified
    6
    Section 28 allows for the admission of evidence of mental
    impairment related to whether the accused “actually formed” a
    required mental state (§ 28, subd. (a)), but section 29 prohibits
    expert testimony on that question (§ 29).
    30
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    that the fire at defendant’s house was set in several places and
    that a very small amount of gasoline was used. He found it odd
    that the fire was set where it was not likely to cause significant
    damage and the gas can was put back in its place after use. He
    concluded that “the fire didn’t make a lot of sense.” Winter could
    not recall a similar type of fire, stating, “This is pretty unusual.”
    Addressing scorched items in the oven, Winter testified that
    “[i]t’s just like the rest of this case. It just doesn’t make any
    sense as far as logic.”
    At the conclusion of his testimony, Winter identified
    several classifications of arson, such as insurance fraud and
    crime cover-up and a category he called “psycho fires,” in which
    the motive for the fire is obscure. Although Winter was allowed
    to opine over objection that defendant’s fire fell into the “psycho”
    category, the next day the trial court revisited the ruling and
    struck the testimony.
    Addressing defendant’s mental health experts, the trial
    court ruled that they would not be allowed to recount hearsay
    statements during their testimony. The experts relied on
    statements by defendant and her friends and family members
    for information about her background, including anoxia (lack of
    oxygen) at birth, epilepsy and hospitalization at an early age, a
    difficult upbringing, and use of antidepressant and diet
    medication shortly before the fire. The trial court determined
    that the underlying statements and predicate facts did not
    reflect indicia of reliability and would have to be established
    through live witness testimony.
    Following the court’s ruling, defendant testified
    concerning details leading up to the fire, including her use of
    diet medication and Zoloft after having an abortion. The defense
    31
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    also recalled defendant’s stepfather Albert Lucia to testify about
    defendant’s childhood seizures and verbal and physical abuse by
    her mother.
    Dr. Humphrey then testified regarding defendant’s
    background and possible traumas to her brain, stating that the
    sources she considered to reach her opinion included interviews
    with defendant and letters written by her, interviews with
    Albert Lucia and defendant’s aunt, consultations with a non-
    testifying expert (Dr. Kaser-Boyd), defense team members who
    spoke to other witnesses, and records such as police reports and
    prior assessments. The trial court sustained an objection to Dr.
    Humphrey referencing defendant’s anoxia at birth, but Dr.
    Humphrey went on to testify that defendant experienced other
    risk factors consistent with brain damage early in life: being hit
    hard in the head by her mother several times a day; an incident
    at age 18 months that Dr. Humphrey interpreted as consistent
    with seizure disorder; and fainting after the seizure incident
    consistent with brain malfunction.
    Dr. Ney conducted two examinations of defendant. He
    testified that he relied on the examinations and interviews with
    defendant, transcripts of witness testimony, reports by Drs.
    Humphrey and Kaser-Boyd, police reports, statements by
    defendant and her son to law enforcement, and statements from
    defendant’s friends. Although the defense argued that Dr. Ney
    should be allowed to explain defendant’s statements to him, the
    trial court reiterated its prior ruling that experts would not be
    allowed to repeat inadmissible hearsay.
    During Dr. Ney’s testimony, the trial court also sustained
    numerous objections under section 29. Dr. Ney testified that he
    considered the possibility that defendant was trying to commit
    32
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    suicide on the night of the fire. The trial court sustained section
    29 objections to several additional questions on this topic and
    struck an answer in which Dr. Ney began to testify that he found
    defendant’s actions consistent with suicide. The court overruled
    a section 29 objection concerning whether defendant “was in a
    depressive state” at the time of the fire but sustained section 29
    objections to questions about whether she experienced a seizure,
    serotonin syndrome, or dissociative state at the time of the fire
    and to questions regarding defendant’s general mental condition
    at the time of the fire. The court also struck Dr. Ney’s comment
    that “it’s quite apparent that this was an organically determined
    dissociative state.”
    Despite these rulings, Dr. Ney testified about factors
    affecting defendant at the time of the fire and his opinion that
    they could have induced a seizure and related dissociation that
    would render a person effectively unconscious. Dr. Ney testified
    that defendant heard a roaring on the night of the fire, which he
    interpreted as an epileptic “aura” preceding a seizure.
    On surrebuttal, when Dr. Plotkin testified concerning
    defendant’s increased risk for experiencing seizures and
    delirium, the court sustained a section 29 objection to defense
    counsel’s question that began by asking Dr. Plotkin to assume
    that someone was in a dissociative state when lighting the fire.
    b. Analysis
    i. Arson expert
    Defendant claims that the trial court’s decision to strike
    Del Winter’s opinion about a “psycho” fire was erroneous under
    sections 28 and 29, and that it was improper for the court to
    make the ruling on its own motion. The trial court had broad
    discretion to determine the relevance of the testimony and
    33
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    assess whether it was unduly misleading under Evidence Code
    section 352. (People v. Sanchez (2019) 
    7 Cal.5th 14
    , 54.) The
    trial court could also properly limit questions and interpose its
    own objections under Penal Code section 1044, which outlines a
    judge’s duty to control trial proceedings and limit the
    introduction of evidence to relevant and material matters.
    (People v. Sturm (2006) 
    37 Cal.4th 1218
    , 1241 (Sturm).)
    The trial court was well within its discretion to exclude
    Winter’s opinion as misleading and irrelevant. We found no
    abuse of discretion when, as here, the trial court excluded as
    irrelevant mental state testimony offered by a detective “who
    was not a psychologist or a psychiatrist, was not qualified to
    render an opinion as to whether defendant suffered from a
    mental illness at the time [of the crime,]” and was not “qualified
    to testify generally about the relationship between mental
    illness and certain types of behavior.” (People v. Vieira (2005)
    
    35 Cal.4th 264
    , 292.) Winter was similarly unqualified to
    suggest that the person who set the fire in defendant’s home was
    mentally unwell, or “psycho.”
    Instructing the jury to disregard Winter’s “psycho” label
    did not undercut the defense claim that the motive behind the
    fire was mysterious or missing, as defendant contends. Winter
    testified that the fire in defendant’s case was intentionally but
    poorly set, unusual, and did not make sense. The trial court’s
    limited instruction to disregard the reference to a “psycho” fire,
    which Winter had added to those attributes, was not error.
    ii. Expert reliance on hearsay statements
    When an expert testifies concerning case-specific out-of-
    court statements to explain the bases for his or her opinion,
    those statements must be properly admitted through an
    34
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    applicable hearsay exception or admitted through an
    appropriate witness and presented to the expert through a
    properly worded hypothetical question. (People v. Sanchez
    (2016) 
    63 Cal.4th 665
    , 684.) In Sanchez, we disapproved of the
    conclusion in prior decisions such as People v. Gardeley (1996)
    
    14 Cal.4th 605
    , 618, that expert testimony about case-specific
    hearsay is not admitted for its truth and thus not subject to
    hearsay rules. (Sanchez, at p. 686, fn. 13.) Gardeley nonetheless
    correctly reflected the fundamental rule that “any material that
    forms the basis of an expert’s opinion testimony must be
    reliable” (Gardeley, at p. 618) and recognized that a trial court
    “ ‘has considerable discretion to control the form in which the
    expert is questioned to prevent the jury from learning of
    incompetent hearsay.’ ” (id. at p. 619).
    Defendant contends the trial court’s rulings prevented
    defense experts Drs. Humphrey and Ney from relying on
    hearsay statements that described defendant’s background —
    an essential element of her mental state defense.           Drs.
    Humphrey and Ney both testified, however, that they relied on
    a variety of out-of-court statements in reaching their opinions.
    Dr. Humphrey testified about specific background and risk
    factors she identified from those sources and Dr. Ney testified
    that defendant’s history and symptoms fit the diagnoses
    underlying the defense.
    What the trial court did limit was testimony regarding
    specific hearsay it found unreliable, such as defendant’s post-
    arrest statements about her own background and medication
    use. This was well within the court’s discretion. (Evid. Code,
    § 1252; People v. Jurado (2006) 
    38 Cal.4th 72
    , 129–130.)
    Defendant also contends the trial court’s rulings prevented Dr.
    Kaser-Boyd from testifying at all, but the trial court did not rule
    35
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    on the admissibility of her testimony and there is no evidence in
    the record to indicate why — among many possible reasons —
    the defense decided not to call her.
    iii. Mental state testimony
    Penal Code sections 28 and 29 “permit introduction of
    evidence of mental illness when relevant to whether a defendant
    actually formed a mental state that is an element of a charged
    offense, but do not permit an expert to offer an opinion on
    whether a defendant had the mental capacity to form a specific
    mental state or whether the defendant actually harbored such a
    mental state.” (People v. Coddington (2000) 
    23 Cal.4th 529
    ,
    582.) Under these sections, an expert may testify to establish
    “defendant’s mental disorders at the time of the commission of
    the crimes” and “whether the defendant’s conduct in committing
    the crimes was consistent with the expert’s diagnosis of the
    defendant’s mental condition.” (People v. Samayoa (1997) 
    15 Cal.4th 795
    , 836–837.) Thus, for example, “[a]n expert’s opinion
    that a form of mental illness can lead to impulsive behavior is
    relevant to the existence vel non of the mental states of
    premeditation and deliberation.” (Coddington, at pp. 582–583.)
    Defendant argues the trial court erred by limiting
    questioning of Drs. Ney and Plotkin that would have allowed the
    jury to infer that defendant did not premeditate or deliberate
    murder. She also asserts the conditions at issue — serotonin
    syndrome, a dissociative state, and epilepsy — are not mental
    diseases, defects, or disorders within the scope of section 29
    limitations. Defendant did not raise her contention about the
    scope of section 29 at trial, where she successfully argued that
    all of her conditions were mental disorders that the jury should
    36
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    consider in determining required mental states. This aspect of
    defendant’s claim is therefore forfeited.
    We need not decide whether all the trial court’s limitations
    on defense questioning under section 29 were justified because
    any error was harmless. Defendant claims the trial court
    “eviscerated the defense” by preventing Drs. Ney and Plotkin
    from testifying about the psychological and medical factors
    affecting her at the time of the crimes, but the record reveals
    otherwise.
    Although the trial court struck Dr. Ney’s opinion that
    defendant was suicidal, defense experts were otherwise able to
    testify concerning the substance of what defendant sought to
    present.     Dr. Ney testified that defendant was likely
    experiencing a combination of factors — depression, hormonal
    changes, serotonin syndrome caused by diet and antidepressant
    drug interactions, and seizure activity — that induced a
    dissociative state on the night of the fire. Dr. Plotkin testified
    that these factors would have caused delirium, a condition
    distinct from dissociation, and provided additional medical
    evidence of a seizure close to the time of the fire. Both experts
    testified that such factors could cause a person to be unconscious
    or semi-conscious while engaged in complex-seeming behavior.
    Dr. Ney’s opinion that defendant was suicidal not only
    conflicted with evidence defendant presented from several other
    witnesses that she was not considering suicide, but it also
    supported the prosecution theory that defendant had a suicidal
    plan to kill herself and her children to spite her ex-husbands
    and boyfriend. Precluding defense questioning on this topic, and
    limiting questioning about defendant’s other conditions, did not
    prejudice the defense.
    37
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    4. PET scan evidence
    Defendant contends the trial court erred by excluding
    evidence of her positron emission topography (PET) scan.7
    Although the trial court erred in ruling PET scan evidence
    inadmissible under the Kelly rule,8 the court also excluded the
    PET scan evidence as irrelevant and misleading, a conclusion
    that was not an abuse of discretion.
    a. Background
    Dr. Michael Gold conducted a neurological examination of
    defendant. He reviewed her PET scan and determined it
    showed impairment in some regions of her brain. Based on the
    neuropsychological assessment by Dr. Humphrey, Dr. Gold
    concluded that the impairments shown on the PET scan
    predated defendant’s carbon monoxide poisoning and were
    mostly likely related to a prior head trauma.
    The prosecution orally requested a Kelly hearing on the
    admissibility of PET scan evidence and the trial court granted
    its request and set the hearing the following week to
    accommodate a prosecution expert’s schedule. The trial court
    dismissed defense counsel’s concern about the availability of
    defense experts and rejected a subsequent defense motion to
    7
    We address post, in part II.C.1.b., defendant’s claims
    regarding the exclusion of PET scan evidence in the penalty
    phase.
    8
    Formerly known as the Kelly-Frye rule, based on the
    rulings of People v. Kelly (1976) 
    17 Cal.3d 24
     (Kelly) and Frye v.
    United States (D.C. Cir. 1923) 
    293 F. 1013
    , the rule is now the
    Kelly rule in California after changes to the Federal Rules of
    Evidence that superseded Frye. (People v. Bolden (2002) 
    29 Cal.4th 515
    , 545.)
    38
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    either reconsider the need for a hearing or to continue the
    hearing and allow the defense time to prepare for it.
    After receiving a written motion from the prosecution a
    few minutes before the Kelly hearing was to begin, defendant
    asked the court to strike the last-minute motion or give the
    defense an opportunity to review the cases it cited. In addition
    to arguments to exclude the PET scan under Kelly, the
    prosecution motion claimed the PET scan was irrelevant or
    unduly prejudicial under Evidence Code section 352. The
    prosecution also stated that several articles filed with the trial
    court, which discussed hearings in California and other
    jurisdictions challenging the use of PET scans, supported
    exclusion of the evidence. The trial court determined that the
    hearing would begin immediately, would be framed by the
    prosecution motion, and would settle all issues regarding
    admissibility of the proposed PET scan evidence.
    The defense presented three experts, Dr. Gold, Dr. Arthur
    Kowell, and Dr. Mark Mandelkern. They testified that PET
    scans had been in use since the 1970s and were accepted in the
    scientific community as a legitimate measure of brain function,
    particularly for specific conditions such as temporal lobe
    epilepsy.
    Drs. Gold and Mandelkern found abnormalities in
    defendant’s PET scan that were consistent with temporal lobe
    epilepsy. The abnormal regions of her brain were responsible
    for judgment, memory, and verbal functions, they affected the
    way a person would act and interpret data, and they were
    consistent with indications of defendant’s impairment shown by
    neuropsychological testing. Although it was not possible to
    determine when defendant’s brain was injured, the
    39
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    abnormalities were consistent with defendant’s childhood
    trauma and were not patterns that would occur from carbon
    monoxide poisoning. Dr. Mandelkern testified that the PET
    scan could not explain defendant’s functioning on the night of
    the crimes or indicate whether she had seizures.
    The prosecution presented testimony from Dr. Helen
    Mayberg and Dr. Edwin Amos, who confirmed that PET scans
    were used to identify temporal lobe epilepsy. They did not find
    defendant’s PET scan consistent with epilepsy, however, and
    questioned whether it showed any abnormality at all. Both
    experts testified that defendant’s PET scan was presented in a
    way that exaggerated abnormalities that might be trivial, thus
    skewing the results. They explained that any abnormality on a
    PET scan would not provide information about defendant’s past
    behavior or events in defendant’s case.
    The trial court concluded that the PET scan did not meet
    the Kelly test, ruling that there was no substantial agreement
    in the scientific community about its reliability for the uses
    defendant intended. The trial court also found the evidence had
    little if any relevance because it was highly speculative — there
    was dispute whether the PET scan showed abnormality at all,
    and, moreover, any perceived abnormality could not be linked to
    any impact on defendant at the time of the crimes. The court
    ruled that under Evidence Code section 352 any relevance was
    outweighed by the undue consumption of time, confusion of the
    issues for the jury, and undue prejudice.
    Defendant moved for reconsideration, arguing that she did
    not have time to prepare for the Kelly hearing nor notice that
    the prosecution would argue that proper procedures for
    administering and reading the PET scan were not followed. She
    40
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    also reiterated arguments that the PET scan was admissible in
    the guilt and penalty phases of her trial. The trial court denied
    the motion for reconsideration for the guilt phase and deferred
    a decision on admissibility for the penalty phase.
    b. Analysis
    Under the Kelly rule, “ ‘when faced with a novel method of
    [scientific] proof, [we] have required a preliminary showing of
    general acceptance of the new technique in the relevant
    scientific community’ before the scientific evidence may be
    admitted at trial.” (People v. Daveggio and Michaud (2018) 
    4 Cal.5th 790
    , 831, quoting Kelly, supra, 17 Cal.3d at p. 30.) Kelly
    “renders inadmissible evidence derived from a ‘new scientific
    technique’ unless the proponent shows that (1) ‘the technique is
    generally accepted as reliable in the relevant scientific
    community’; (2) ‘the witness testifying about the technique and
    its application is a properly qualified expert on the subject’; and
    (3) ‘the person performing the test in the particular case used
    correct scientific procedures.’ ” (People v. Jackson (2016) 
    1 Cal.5th 269
    , 315–316.) The party offering the evidence has the
    burden of proving its admissibility by a preponderance of the
    evidence. (People v. Ashmus (1991) 
    54 Cal.3d 932
    , 970.) We
    review de novo the trial court’s evaluation regarding whether a
    new scientific technique is generally accepted as reliable in the
    relevant scientific community. (Id. at 971.)
    Defendant proposed using the PET scan to corroborate
    defendant’s history of seizure disorder and related cognitive
    impairment. At the Kelly hearing, expert testimony established
    that PET scans had been used for decades to evaluate brain
    abnormality, and defense and prosecution experts alike testified
    that PET scans were widely accepted and reliable for identifying
    41
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    brain abnormalities caused by temporal lobe epilepsy. That the
    experts disagreed about whether defendant’s PET scan showed
    such abnormality was a difference of opinion going to the weight
    of the evidence, not to its admissibility. (People v. Fierro (1991)
    
    1 Cal.4th 173
    , 214; People v. Jones (2013) 
    57 Cal.4th 899
    , 953.)
    The People argue there was evidence that defense experts
    did not use correct scientific procedures when manipulating the
    PET scan images to highlight deficits. Yet prosecution expert
    Dr. Mayberg testified that the type of manipulation seen in
    defendant’s PET scan images was something radiologists did
    “all the time.” The record does not support a finding that correct
    scientific procedures were lacking.
    Although the trial court erred in its ruling under Kelly, the
    court did not abuse its discretion by excluding the PET scan
    under Evidence Code section 352. The trial court retains
    discretion to exclude even relevant evidence when its probative
    value is substantially outweighed by the probability that its
    admission will either necessitate undue consumption of time or
    create substantial danger of undue prejudice, confusing the
    issues, or misleading the jury. (People v. Young (2019) 
    7 Cal.5th 905
    , 931.) “We review a trial court’s decision to admit or exclude
    evidence ‘for abuse of discretion, and [the ruling] will not be
    disturbed unless there is a showing that the trial court acted in
    an arbitrary, capricious, or absurd manner resulting in a
    miscarriage of justice.’ ” (People v. Powell (2018) 
    5 Cal.5th 921
    ,
    951.) A trial court does not abuse its discretion by excluding
    evidence that produces only speculative inferences. (People v.
    Cornwell (2005) 
    37 Cal.4th 50
    , 81, disapproved on other grounds
    in People v. Doolin (2009) 
    45 Cal.4th 390
    , 421, fn. 22.)
    42
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    In excluding evidence of the PET scan, the trial court
    found it minimally relevant because it was highly speculative.
    The court cited consensus among the experts that any abnormal
    feature on the PET scan could not be linked to defendant’s
    condition or actions at the time of the fire. After three days of
    testimony from experts who disagreed about what, if anything,
    defendant’s PET scan showed, it was not an abuse of discretion
    for the trial court to determine that undue consumption of time
    and confusion of issues for the jury outweighed what limited
    relevance the PET scan might have.
    Defendant claims exclusion of PET scan evidence violated
    her right to present a defense. We have explained, however,
    that “the ordinary rules of evidence, including the application of
    Evidence Code section 352, do not infringe on the accused’s due
    process right to present a defense.” (People v. Frye (1998)
    
    18 Cal.4th 894
    , 948.) “ ‘Although we recognize that a criminal
    defendant has a constitutional right to present all relevant
    evidence of significant probative value in [her] favor
    [citations], “. . . the proffered evidence must have more than
    ‘slight-relevancy’ to the issues presented.” ’ ” (People v. Homick
    (2012) 
    55 Cal.4th 816
    , 865.) Here, defense experts agreed the
    PET scan could not shed light on whether defendant
    experienced a seizure on the night of the fire. Furthermore, any
    abnormality affecting defendant’s judgment or impulsivity had
    no apparent bearing on the guilt-phase defense, which was
    based on defendant’s allegedly unconscious actions. Under
    these circumstances, the PET scan had little probative value
    and its exclusion did not violate defendant’s constitutional
    rights.
    Defendant contends the trial court abused its discretion by
    denying her request for a continuance to prepare for the Kelly
    43
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    hearing, and that any insufficient showing by the defense was
    caused by the court forcing counsel to proceed, resulting in a
    fundamentally unfair hearing. Exclusion of the evidence under
    section 352, however, was not the result of an inadequate
    showing by the defense. Defendant’s experts unequivocally
    endorsed key facts that supported the trial court’s section 352
    ruling: the PET scan could not be correlated to particular
    conditions or behaviors at the time of the fire or used to conclude
    that defendant had experienced a seizure. There is no evidence
    on this record to suggest that additional time to prepare would
    have altered these conclusions.
    Defendant argues that the trial court also abused its
    discretion and deprived her of due process by allowing the
    prosecution to challenge the relevance of PET scan evidence and
    to seek its exclusion pursuant to Evidence Code section 352
    without proper notice to the defense. This argument is forfeited
    by defendant’s failure to raise it in the trial court. (People v.
    Riggs (2008) 
    44 Cal.4th 248
    , 304.) It also lacks merit. In her
    motion to reconsider the PET scan exclusion, defendant
    acknowledged that she had notice of prosecution challenges to
    relevance and prejudicial effect. The prosecution motion raised
    these issues, the trial court expressed its intent to address them,
    and defendant ultimately presented evidence and argument on
    them.
    Finally, defendant contends discovery statutes did not
    authorize prosecution cross-examination of defense experts
    outside the Kelly framework. Evidence Code sections 403 and
    402 plainly permit the trial court to preview evidence and hear
    testimony before ruling on questions of admissibility.
    Furthermore, “ ‘[i]n determining the admissibility of evidence,
    the trial court has broad discretion.’ ” (People v. Jackson, supra,
    44
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    1 Cal.5th at p. 320.) “ ‘When the relevance of proffered evidence
    depends upon the existence of a preliminary fact, the trial court
    must determine whether the evidence is sufficient to permit the
    jury to find the preliminary fact true by a preponderance of the
    evidence.’ ” (Id. at p. 321.) Discovery of potential testimony, by
    both parties, was an unavoidable consequence of the court’s
    proper function.    (Cf. Hawkins v. Superior Court (1978)
    
    22 Cal.3d 584
    , 588 [discovery benefit to accused is incidental to
    preliminary hearing for probable cause determination].)
    5. Failure to disqualify a prosecution expert
    Defendant contends the trial court erred when it allowed
    Dr. Alex Caldwell, whose company scored defendant’s
    psychological testing, to testify on rebuttal for the prosecution.
    Defendant argues that Dr. Caldwell’s appointment allowed
    prosecutors access to confidential and privileged information
    and violated her Fifth, Sixth, Eighth, and Fourteenth
    Amendment rights. We conclude that no error occurred.
    a. Background
    Defense psychologist Dr. Kaser-Boyd administered
    psychological tests to defendant in 1999 that included the
    Minnesota Multiphasic Personality Inventory-2 (MMPI-2). Dr.
    Kaser-Boyd sent the MMPI-2 results to Dr. Caldwell’s scoring
    service and obtained a computer-generated report that scored
    and interpreted them according to his proprietary algorithm.
    Dr. Kaser-Boyd’s report analyzed the 1999 testing and the
    results of another MMPI-2 administered to defendant in 1997
    during family court proceedings.
    Defense counsel’s disclosures to the prosecution included
    Dr. Kaser-Boyd’s report, the MMPI-2 test results, and Dr.
    Humphrey’s report, which indicated that she reviewed Dr.
    45
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Kaser-Boyd’s report and the MMPI-2 testing. After defense
    counsel announced he would call Dr. Humphrey to testify, the
    prosecutors obtained the appointment of Dr. Caldwell pursuant
    to Evidence Code section 730 to assist them and prepare to
    provide rebuttal testimony regarding the MMPI-2. The trial
    court denied defendant’s motion to vacate Dr. Caldwell’s
    appointment.
    During cross-examination, Dr. Humphrey confirmed that
    she reviewed Dr. Caldwell’s report. She acknowledged that his
    report found a strong possibility that defendant had
    exaggerated her test responses or falsified them, a detail Dr.
    Humphrey had not mentioned in her own report or direct
    testimony. Dr. Humphrey also acknowledged that the 1997
    MMPI-2 found defendant trying hard to present herself in a
    favorable light, likely invalidating the profile. Dr. Caldwell
    testified on rebuttal that the 1999 and 1997 results were
    “strikingly opposite” and suggestive of someone consciously
    distorting the results.
    b. Analysis
    Defendant claims the trial court erred by refusing to
    vacate     Dr.    Caldwell’s    appointment,     arguing    that
    disqualification was required because he received confidential
    and privileged information from the defense. Defendant relies
    primarily on federal civil cases to support her theory that
    disqualification was required for “a ‘switching sides’ expert —
    an expert who is initially retained by one party, dismissed, and
    employed by the opposing party in the same or related
    litigation.” (Erickson v. Newmar Corp. (9th Cir. 1996) 
    87 F.3d 298
    , 300.) Defendant has forfeited this argument by failing to
    present it to the trial court. The civil disqualification concerns
    46
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    are also inapplicable in this setting, in which Dr. Caldwell’s
    report and the underlying data were plainly confidential and yet
    were voluntarily disclosed to the prosecution pursuant to
    criminal discovery obligations.
    We reject defendant’s argument that the trial court
    violated her right against self-incrimination by allowing the
    prosecution to retain Dr. Caldwell and use confidential
    information in his report against her. “By presenting, at trial, a
    mental-state defense to criminal charges or penalties, a
    defendant waives his or her Fifth Amendment privilege to the
    limited extent necessary to allow the prosecution a fair
    opportunity to rebut the defense evidence.         Under such
    circumstances, the Constitution allows the prosecution to
    receive unredacted reports of the defendant’s examinations by
    defense mental experts, including any statements by the
    defendant to the examiners and any conclusions they have
    drawn therefrom.”      (Maldonado v. Superior Court (2012)
    
    53 Cal.4th 1112
    , 1125.) Once a defendant calls a defense expert
    to the stand, she waives “any protections that the attorney-
    client privilege, the attorney work product doctrine, and the
    privilege against self-incrimination afforded [her] regarding all
    matters that [her testifying experts] considered or on which they
    relied.” (People v. Combs (2004) 
    34 Cal.4th 821
    , 864 (Combs);
    see also Ledesma, 
    supra,
     39 Cal.4th at p. 695.)
    Furthermore, an expert witness may be cross-examined
    concerning “the matter upon which his or her opinion is based
    and the reasons for his or her opinion.” (Evid. Code, § 721, subd.
    (a)(3).) “The scope of cross-examination permitted under section
    721 is broad, and includes examination aimed at determining
    whether the expert sufficiently took into account matters
    arguably inconsistent with the expert’s conclusion.” (Ledesma,
    47
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    supra, 39 Cal.4th at p. 695.) The prosecution may not only cross-
    examine a defense expert about an otherwise privileged report
    the expert considered, but also may call the non-testifying
    author of such a report to testify as a rebuttal witness for the
    prosecution. (Combs, 
    supra,
     34 Cal.4th at p. 864; People v.
    Alfaro (2007) 
    41 Cal.4th 1277
    , 1323.)
    Defendant cites Rodriguez v. Superior Court (1993)
    
    14 Cal.App.4th 1260
    , 1270, to support her argument that she
    did not waive her privilege against self-incrimination when she
    disclosed Dr. Caldwell’s report.        The appellate court in
    Rodriguez did not address Fifth Amendment protections, ruling
    instead that attorney-client privileges applied to pretrial
    discovery and that defendant’s statements about the charged
    offense could properly be redacted from an otherwise
    discoverable defense expert’s report.           (Ibid.)      Such
    considerations are not relevant here, where defense counsel
    voluntarily disclosed all reports related to MMPI-2 testing to the
    prosecution.
    Defendant also claims that Dr. Humphrey’s testimony did
    not result in a waiver of privileges because Dr. Humphrey did
    not base her opinions on Dr. Caldwell’s report and the defense
    did not “open the door” by asking Dr. Humphrey about the
    report during direct examination. This argument, which
    defendant raises for the first time in her reply briefing, is one
    we have rejected. (Combs, supra, 34 Cal.4th at p. 864.) When
    testifying experts have “read and considered” a non-testifying
    expert’s report, all privileges regarding the report are waived.
    (Ibid.; Ledesma, 
    supra,
     39 Cal.4th at p. 696.)
    Here, the trial court correctly ruled that defendant waived
    her Fifth Amendment rights and other privileges regarding Dr.
    48
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Caldwell’s report when she presented the testimony of Dr.
    Humphrey.      Dr. Humphrey testified that she considered
    defendant’s MMPI-2 reports but she ignored the implications
    they raised about defendant’s truthfulness. The prosecution
    was entitled to call Dr. Caldwell as a witness to address “all the
    circumstances involved in the testing, not merely the truncated
    version defendant desire[d].” (People v. Cooper (1991) 
    53 Cal.3d 771
    , 824; see also People v. Alfaro, supra, 41 Cal.4th at p. 1326.)
    Defendant claims Dr. Caldwell’s appointment to assist the
    prosecution was improper because it preceded Dr. Humphrey’s
    testimony, but defendant points to no authority to suggest that
    the prosecution is prohibited from preparing for anticipated
    rebuttal. On the contrary, such preparation, even before trial,
    does not violate defendant’s constitutional rights or other
    privileges. (People v. Maldonado, 
    supra,
     53 Cal.4th at pp. 1132–
    1133.) Under Evidence Code section 730, the authority under
    which Dr. Caldwell was appointed, trial courts may appoint
    experts to assist the prosecution with rebuttal concerning a
    mental state defense. (People v. Banks, supra, at p. 1193;
    Maldonado, at p. 1125.)
    Defendant also contends the trial court’s decision to allow
    Dr. Caldwell to testify against her violated her Sixth and
    Fourteenth Amendment rights to the assistance of counsel and
    the ancillary services of mental health experts. “A criminal
    defendant has the due process right to the assistance of expert
    witnesses, including the right to consult with a psychiatrist or
    psychologist, if necessary, to prepare his [or her] defense. (Ake
    v. Oklahoma (1985) 
    470 U.S. 68
    , 83.) The Sixth and Fourteenth
    Amendments to the United States Constitution also guarantee
    a defendant’s right to present the testimony of these expert
    witnesses at trial.” (People v. San Nicolas (2004) 
    34 Cal.4th 614
    ,
    49
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    661–662.)
    These propositions, focusing on a defendant’s access to
    confidential expert assistance to prepare a defense, are
    inapposite here, where the record reveals at least eight experts
    who assisted the defendant with her mental state defense.
    6. Asserted prosecutorial misconduct
    Defendant contends that the prosecutor committed
    misconduct by asking Dr. Plotkin to opine about the credibility
    and veracity of defense witness testimony by Albert Lucia and
    defendant. Defendant argues that the questioning constituted
    misconduct under California law and violated her federal
    constitutional rights to a fair trial. We reject these claims.
    a. Background
    Albert Lucia, defendant’s stepfather, spoke to her the day
    before the fire and testified about her state of mind at that time.
    After the trial court ruled that defense experts would not be
    allowed to relate Lucia’s description of defendant’s childhood,
    the defense recalled him to testify concerning defendant’s
    history of seizures, hospitalization, and loss of consciousness as
    a child.
    Defendant testified regarding events before, during, and
    after the fire. She testified that she began taking Zoloft after
    her abortion. She also claimed that she did not recall writing
    letters just before the fire that various people received from her;
    she said that obscenities in one letter, which said “fuck you,”
    were not her “normal way of talking.”           During cross-
    examination, the prosecutor highlighted defense expert notes
    indicating that defendant did recall writing the letters and in
    rebuttal presented evidence that a code defendant used to access
    her pager messages was “fuck you.” The prosecution also
    50
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    questioned defendant’s veracity during its case-in-chief,
    presenting evidence that when renting her home defendant
    falsely stated that she was married with three, rather than five,
    children, and forged her ex-husband’s signature on the rental
    application.
    Dr. Plotkin testified on surrebuttal that defendant’s
    childhood health issues, as described by Lucia, were consistent
    with childhood seizures, which contributed to his opinion that
    defendant’s actions could have been affected by a seizure at the
    time of the fire. On cross-examination, Dr. Plotkin explained
    that Lucia’s testimony was compelling because it was unlikely a
    lay person could give the proper sequence of events to reflect
    seizure disorder. In response to questions suggesting that Lucia
    could have been coached before he returned to testify a second
    time, Dr. Plotkin agreed that without more information it was
    as likely as not that he was coached.
    Dr. Plotkin also described the potential effects of
    defendant’s medication interactions, basing his conclusions on
    defendant’s claim that she took Zoloft. The prosecutor asked
    whether it would affect Dr. Plotkin’s view of defendant’s
    truthfulness to know that she had a history of malingering on
    psychological tests, as established by Dr. Caldwell’s analysis of
    her MMPI-2 test results, and had fabricated a rental agreement
    and committed fraud on her landlord. Apparently referencing
    the testimony regarding defendant’s use of obscenities and her
    pager code, the prosecutor asserted that defendant lied and
    committed perjury on the witness stand and that physical
    evidence proved her to be a liar. Dr. Plotkin conceded that if
    defendant had lied in the past she might lie again.
    51
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    b. Analysis
    “A prosecutor who uses deceptive or reprehensible
    methods to persuade the jury commits misconduct, and such
    actions require reversal under the federal Constitution when
    they infect the trial with such ‘ “unfairness as to make the
    resulting conviction a denial of due process.” ’ [Citations.]
    Under state law, a prosecutor who uses such methods commits
    misconduct even when those actions do not result in a
    fundamentally unfair trial. [Citation.] In order to preserve a
    claim of misconduct, a defendant must make a timely objection
    and request an admonition; only if an admonition would not
    have cured the harm is the claim of misconduct preserved for
    review.” (People v. Alfaro, supra, 41 Cal.4th at p. 1328; see also
    People v. Chatman (2006) 
    38 Cal.4th 344
    , 380 [objection to
    misconduct at trial must be timely “and on the same ground” as
    that raised on appeal].)
    Defendant first argues that the prosecution committed
    misconduct by eliciting speculative and irrelevant testimony
    from Dr. Plotkin about Lucia’s veracity. Defendant’s failure to
    object on this basis at trial forfeits the claim. Defendant argues
    that she adequately preserved the misconduct claim with
    objections that the prosecution misstated the evidence, but this
    unrelated objection did not give the trial court “an opportunity
    to correct the asserted abuse.” (People v. Young (2005)
    
    34 Cal.4th 1149
    , 1186.) Even were the claim preserved, we
    would conclude that it lacks merit.
    “ ‘[I]t is well settled that the scope of cross-examination of
    an expert witness is especially broad.’ ” [Citation.]” (People v.
    Peoples (2016) 
    62 Cal.4th 718
    , 746.) It is therefore permissible
    to “cross-examine an expert witness more extensively and
    52
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    searchingly than a lay witness, and . . . to attempt to discredit
    the expert’s opinion.” (People v. Dennis (1998) 
    17 Cal.4th 468
    ,
    519; accord People v. Alfaro, supra, 41 Cal.4th at p. 1325.) “ ‘In
    cross-examining a psychiatric expert witness, the prosecutor’s
    good faith questions are proper even when they are, of necessity,
    based on facts not in evidence. [Citation.]’ ” (People v. Wilson
    (2005) 
    36 Cal.4th 309
    , 358.)
    Defendant asserts an expert witness may not express an
    opinion on witness credibility and that questions concerning
    that topic improperly called for irrelevant testimony. We have
    recognized, however, that “[t]here is no reason to categorically
    exclude” such questioning.        (People v. Chatman, 
    supra,
    38 Cal.4th at p. 382.) Dr. Plotkin accepted Lucia’s testimony as
    credible because he doubted Lucia could fabricate a sequence of
    events indicative of seizure disorder.         The prosecutor’s
    subsequent questioning about whether Lucia could have been
    coached was a “plausible alternative” to Dr. Plotkin’s
    interpretation that was relevant and permissible in order to
    explore those assertions. (People v. Anderson (1990) 
    52 Cal.3d 453
    , 479; see also Chatman, at p. 382.)
    Defendant next contends the prosecution committed
    misconduct when questioning Dr. Plotkin about defendant’s
    credibility by stating that she had lied and committed perjury.
    Defendant argues that by objecting to such questions as
    misstating or mischaracterizing the evidence, she preserved the
    claim. Even if that were case, we would conclude that the claim
    lacks merit.
    “An expert witness may be cross-examined on, among
    other subjects, the matter upon which his or her opinion is based
    and the reasons for the opinion, including any statements by the
    53
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    defendant that formed the basis for the expert’s opinion.”
    (People v. Coffman and Marlow, supra, 34 Cal.4th at p. 85; Evid.
    Code, § 721, subd. (a).) Although it is misconduct to misstate
    evidence during witness questioning (People v. Hill (1998)
    
    17 Cal.4th 800
    , 825), a prosecutor may address the credibility of
    witnesses by reference to facts in the record (People v. Peoples,
    supra, 62 Cal.4th at p. 796). “Prosecutors tread on dangerous
    ground, however, when they resort to epithets to drive home the
    falsity of defense evidence.” (People v. Ellis (1966) 
    65 Cal.2d 529
    , 539.)
    Characterizing defendant as a liar and perjurer based on
    an obscene pager code was questionable; defendant’s testimony
    on cross-examination, however, raised the possibility that she
    attempted to falsely deny responsibility for writing a highly
    inculpatory note to her ex-husband. We conclude that the
    “single reference” to alleged perjury (People v. Ellis, supra,
    65 Cal.2d at p. 540) did not rise to the level of “ ‘deceptive or
    reprehensible methods’ ” that amounted to misconduct (People
    v. Friend (2009) 
    47 Cal.4th 1
    , 29), and the prosecutor’s other
    questions — about defendant’s exaggerated or false MMPI-2
    responses and misrepresentation and forgery in her rental
    application — were proper subjects for cross-examination based
    on evidence before the jury.
    7. Instructional error related to discovery violations
    Defendant contends the trial court erred when it
    instructed the jury that she concealed and failed to timely
    disclose material related to defense experts and lay witnesses.
    Although the trial court erred, we conclude the error was
    harmless.
    54
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    a. Background
    Before trial, the defense disclosed reports from its arson
    expert and experts addressing defendant’s mental state. The
    prosecutors moved for additional discovery of interviews and
    other materials considered by defense experts, with defendant
    arguing that they were not entitled to pretrial discovery of such
    information. The trial court’s pretrial discovery order tracked
    the language of section 1054.3, requiring defendant to disclose,
    among other things, names, addresses, written statements, and
    reports of statements by witnesses the defense intended to call
    and expert reports and the results of any physical or mental
    examinations the defense intended to offer in evidence at trial.
    As trial approached, the prosecution continued requesting
    discovery from defense experts, including material they relied
    upon, notes about their testing and communications with other
    experts, and the methodology experts used to obtain and analyze
    test results. The defense disclosed some of its experts’ notes
    concerning the tests administered to defendant but again
    argued that other notes and materials were protected until the
    experts testified. The trial court ruled that defendant was
    entitled to withhold additional privileged information at least
    until the prosecution rested.
    At the close of the prosecution’s case-in-chief, defense
    counsel provided what he claimed was all remaining discovery
    from the defense experts, including notes, interviews, testing,
    and communications with defendant. The prosecution asked for
    a month-long continuance to review the new material and
    prepare to cross-examine defense experts. The prosecution also
    complained that some of the experts’ handwritten notes were
    55
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    illegible and the prosecutors would need time to review them
    with its experts.
    At the same time, it came to light that defense counsel had
    not disclosed statements by the first lay witnesses he intended
    to call, Debbie Wood and Rhonda Hill. Counsel then turned over
    interview notes for Hill and Wood, and for Albert Lucia and
    Penny Lucia, claiming he overlooked them because they were in
    his paralegal’s files. The trial court ruled that those defense
    witnesses would not be allowed to testify until the court could
    determine what sanctions to impose for the discovery violations:
    “It may be that there’s no prejudice to the prosecution, but I am
    not going to know that until I have a hearing on it.”
    The trial court then informed the jury: “Ladies and
    gentlemen, under the law in California, the laws of discovery
    require that the prosecution and the defense are required to
    disclose to each other before trial the evidence each intends to
    present at trial. The reason for doing that is to promote the
    ascertainment of truth, save court time, and avoid surprise
    which may arise during the course of trial. [¶] Disclosures of
    evidence are required to be made at least 30 days in advance of
    trial. Any new evidence discovered within 30 days of trial must
    be disclosed immediately. [¶] This morning, and in one case
    this afternoon, [defense counsel] provided the prosecution for
    the first time statements of witnesses that should have been
    disclosed 30 days before trial. [¶] Because it is late disclosure
    the court is going to give the People sufficient time to prepare as
    to one witness, and the court will consider what will happen as
    the other two or more witnesses. . . . I’ll give you further
    instructions on this discovery noncompliance later on when the
    issues are more clarified.”
    56
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The prosecutors’ primary concern regarding the lay
    statements was whether the defense experts had considered
    them. After determining that those experts had not considered
    the Wood and Hill statements, the prosecutors stated that they
    were prepared to cross-examine them without delay but
    requested additional time to prepare for the testimony of Albert
    and Penny Lucia. The trial court decided the testimony would
    proceed as scheduled, with the prosecution allowed to recall the
    Lucias to address any issues raised by the new discovery. The
    untimely statement from Albert Lucia was brief, and addressed
    an incident involving defendant’s mother.           During his
    testimony, the court sustained objections to the incident as
    irrelevant.
    Regarding newly disclosed expert materials, the trial
    court stated that the options were to preclude defense expert
    testimony entirely or grant a continuance to allow the
    prosecution time to prepare. The court faulted the defense for
    the prospect of a two to four week continuance it found
    “outrageous.” To avoid further delay during which time the
    prosecution would attempt to decipher experts’ notes, the trial
    court ordered one of the defense experts to provide the
    prosecution with a typed transcription of his notes and ordered
    two others to dictate their notes to court reporters, who would
    then provide a transcription.
    The trial court then informed the jury there would be a
    two-week recess: “And I wanted to tell you the reason why we’re
    taking this two-week delay. [¶] The defense has indicated their
    intention to call psychologists and/or psychiatrists in the
    defense. The People were provided with the information from
    their experts — and they need to prepare for this presentation
    — fairly recently. [¶] And the timing of that disclosure, which
    57
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    is permitted by law; in other words, the defense doesn’t have to
    provide that information until the witnesses testify. But the
    delay in the disclosure has necessitated a need to continue this
    case so that the People can prepare to examine the witnesses.
    [¶] Also the time is needed because the notes of some of their
    experts are indecipherable to a great degree, and there’s going
    to be a need for time to get those notes put into some kind of a
    form where they can be read and interpreted by the People’s
    experts.”
    The trial court then immediately proceeded to address the
    discovery violation regarding the lay witnesses, advising the
    jury with CALJIC former No. 2.28 that “defendant has
    concealed and failed to timely disclose evidence regarding
    witness statements — witness statements of Debbie Woods,
    Rhonda Hill, Al Lucia, Penny Lucia, Delores Morris, and Aunt
    Lenore.”9 The court also imposed a $500 monetary sanction on
    defense counsel under Code of Civil Procedure section 177.5.
    9
    The full instruction provided the following: “Also a slightly
    different issue, and I gave you an instruction on this, I believe,
    last week. [¶] That is that the prosecution and defense are
    required to disclose to each other before trial evidence each
    intents to present at the trial so as to promote the ascertainment
    of truth, save court time, and avoid any surprise which may
    arise during the course of the trial. [¶] Concealment of evidence
    and delay in the disclosure of evidence may deny a party a
    sufficient opportunity to subpoena necessary witnesses or
    produce evidence which may exist to rebut the non-compliant
    party’s evidence. [¶] Disclosure of evidence is required to be
    made at least 30 days in advance of trial. Any new evidence
    discovered within 30 days of trial must be disclosed
    immediately. [¶] In this case, the defendant has concealed and
    failed to timely disclose evidence regarding witness statements
    — witness statements of Debbie Woods, Rhonda Hill, Al Lucia,
    58
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Defense counsel objected to the court referencing the
    statements of Morris and Lenore Frey — their statements came
    from defense expert files but they were not defense witnesses.
    Defense counsel later raised additional objections to the
    discovery sanction, to the court’s remarks to the jury about the
    two-week delay, and to the trial court “lump[ing] everything
    together” when it addressed the continuance and discovery
    violations at the same time.
    During Dr. Humphrey’s cross-examination, she revealed
    that she did not use standard normative data to score one of the
    tests she administered to defendant. She acknowledged that
    she had been told to provide prosecutors with everything she
    consulted, but she had not given them information about the
    new data.
    Just before Dr. Ney testified, the defense turned over the
    doctor’s recent interview with Albert Lucia, several pages of
    research articles he considered, and a package of material he
    planned to reference that included his opinions about a number
    of conditions and differential diagnoses.          Dr. Ney also
    acknowledged that he interviewed defendant the night before
    testifying, and, at defense counsel’s suggestion, did not take
    notes. The prosecution informed the court that there was a
    Penny Lucia, Delores Morris, and Aunt Lenore. [¶] Although
    this concealment and failure to timely disclose evidence was
    without lawful justification, the court will, under the law,
    permit the production of this evidence during the trial. [¶] The
    weight and significance of any concealment and delay of
    disclosure are matters for your consideration. [¶] However,
    when you do start to deliberate in this case, you should consider
    whether the concealed and untimely disclosed evidence pertains
    to a fact of importance, something trivial, or subject matters that
    are established by other credible evidence.”
    59
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    “huge amount” of new information in the recently disclosed
    material.
    The trial court concluded that the recent disclosures
    appeared to violate the court’s ruling made a week prior,
    requiring Dr. Ney to produce everything he relied upon in
    forming his opinion. The court then explained to the jury that,
    given the new disclosure, “I am going to have to make a decision
    on whether this is a violation of the discovery rules.”
    Upon further examination, it appeared the disclosures
    included a prior, undisclosed report of Dr. Ney’s conclusions and
    a “pregnancy loss questionnaire” regarding defendant that he
    had not turned over to the prosecution. The court ordered the
    defense to make Dr. Ney’s entire file available to the prosecution
    for review, which in turn revealed additional reports, notes, and
    articles not previously disclosed. The prosecutor stated that she
    was not inclined to ask for more time to review the material
    because doing so would not be fair to the jury, but she requested
    monetary sanctions against both Dr. Ney and defense counsel,
    as well as a jury instruction, which the defense opposed.
    The trial court denied the request for sanctions against Dr.
    Ney but agreed over additional defense objections to instruct the
    jury with CALJIC No. 2.28. The trial court rejected the
    prosecution’s argument that the initial mid-trial disclosure of
    defense expert material, and two-week delay, justified the
    instruction. The prosecutors also conceded the instruction was
    not appropriate with regard to Penny Lucia’s statement, which
    they received before her testimony, or for statements from
    Morris and Frey, who did not testify. The trial court stated that
    the wording of violations pertaining to Drs. Ney and Humphrey
    60
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    was meant to be broad enough to address Dr. Ney’s failure to
    take notes when interviewing defendant.
    When giving guilt phase instructions, the trial court read
    to the jury CALJIC former No. 2.28, describing defendant’s
    violations as concealing and failing to timely disclose “[w]itness
    statements of Debbie Wood, Rhonda Hill, and Al Lucia” and to
    provide “[r]eadable notes and reports and other materials relied
    upon [by] witnesses Dr. Philip Ney and Dr. Lorie Humphrey.”
    The prosecution also referenced the instruction in closing
    argument: “You also received an instruction with respect to
    discovery violations and the failure to produce evidence 30 days
    prior to trial. [¶] [The] People, along with the Sheriff’s
    Department, gave all the evidence to the defense in accordance
    with the law. We can’t say the same for the defense. [¶] The
    point of it is you can’t find defendant guilty because they hid
    stuff. The point is why. Why hide? Why hide your defense? [¶]
    I[’ll] tell you why. Desperation. The evidence in this case is so
    overwhelming, so enormous, and so vast, what are you going to
    do? [¶] It’s in order to prevent the prosecution from being able
    to prepare; in order to gain a strategic advantage.”
    b. Analysis
    Defendant claims the trial court erred when it sanctioned
    her for failing to provide the prosecution with items the criminal
    discovery statutes did not obligate her to disclose and for
    discovery violations that did not hinder the prosecution. She
    also argues that the particular instruction given, CALJIC
    former No. 2.28, was flawed in several respects.
    i. Scope of discovery violations
    Defendant argues preliminarily that there was no
    discovery violation related to the disclosure of statements from
    61
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    witnesses Morris and Frey, “readable” notes from defense
    experts, and materials relied upon by defense experts. We agree
    that defendant’s disclosure of these items did not violate the
    criminal discovery statute or the trial court’s pretrial discovery
    rulings. Defendant also contends that discovery violations that
    did occur were limited and of little consequence, a
    characterization we find incomplete in that it refers only to
    disclosures regarding lay witness.
    First, defendant claims that her disclosure of the Morris
    and Frey statements did not constitute a discovery violation
    because she did not intend to call them as witnesses in the guilt
    phase. The record indicates that the statements were among
    the disclosed files of a defense expert, but Morris and Frey did
    not testify during the guilt phase, and the prosecutors later
    conceded that guilt phase instructions about discovery
    violations should not reference Morris and Frey.
    The People argue that the statements were discoverable
    because defense experts relied on them.          Although the
    prosecution was entitled to material upon which testifying
    experts relied (Ledesma, supra, 39 Cal.4th at p. 695), the trial
    court ruled that defendant’s disclosure of expert materials
    shortly before their testimony was lawful. There was no
    discovery violation because the statements did not pertain to
    witnesses the defense intended to call (§ 1054.3) and the defense
    disclosed them as a basis for expert opinion at a time the trial
    court condoned. The People assert defendant forfeited her
    argument by disclosing the Morris and Frey statements without
    objection, but this does not establish forfeiture of the claim that
    discovery sanctions were unwarranted, an objection defendant
    raised at trial.
    62
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The People also argue that the defense improperly delayed
    disclosures related to Frey. They assert that because she was
    later called as a penalty phase witness, her statements should
    have been disclosed 30 days before the guilt phase. The trial
    court addressed discovery violations related to Frey’s
    statements during the penalty phase when they arose but this
    posed no discovery violation with regard to the guilt phase, as
    the prosecution ultimately acknowledged.
    Second, defendant claims that because she was not
    required to disclose notes and other material relied upon by
    defense experts until they were called to testify, there was no
    discovery violation that warranted the trial court’s instruction
    that she concealed and failed to disclose “readable” notes.
    The People assert that the criminal discovery statute
    requires defendants to disclose an expert’s raw written notes,
    citing Verdin, supra, 
    43 Cal.4th 1096
    , 1103–1104, and
    Thompson v. Superior Court (1997) 
    53 Cal.App.4th 480
    , 486.
    These cases do not support such a broad proposition. In Verdin
    we addressed compelled pretrial examination of a defendant by
    prosecution experts and merely observed that the defendant in
    that case did not object to disclosing “written or recorded
    information” possessed by the defense expert; we also
    determined that the description of discovery in Penal Code
    sections 1054.1 and 1054.3 did not exclude other types of
    materials from the reach of the criminal discovery statutes.
    (Verdin, at pp. 1103–1104.) In Thompson, the appellate court
    determined that raw notes of a witness interview constituted
    witness statements for purposes of Penal Code sections 1054.1
    and 1054.3. (Thompson, at p. 485.)
    63
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Defense counsel’s pretrial disclosures included expert
    notes concerning their testing of defendant. The notes at issue
    regarding the later disclosures included defendant’s statements
    to experts and consultations among defense experts and other
    defense team members, information normally protected from
    disclosure until presentation of the expert’s testimony waives
    applicable privileges. (Ledesma, supra, 39 Cal.4th at p. 695;
    § 1054.6; see also Evid. Code, § 721, subd. (a).)
    Although an expert’s handwritten notes may be
    discoverable pursuant to section 1054.3 under some
    circumstances (People v. Hajek and Vo (2014) 
    58 Cal.4th 1144
    ,
    1233), the trial court here ruled that defense counsel was not
    required to disclose privileged information and work product
    before trial and acknowledged that defendant was entitled to
    delay disclosure of notes and other expert materials until her
    experts testified. We therefore conclude that regardless of their
    legibility, defendant was not required to disclose the expert
    notes before trial. “Rather, because the record does not
    demonstrate the [defendant] failed to disclose any discoverable
    material, and the undisclosed . . . information fell outside the
    scope of the discovery statute, no discovery violation appears.”
    (People v. Tillis (1998) 
    18 Cal.4th 284
    , 290–291.)
    The People contend that defendant did not object to her
    experts creating legible versions of their notes and thus forfeited
    the claim. This point, which defendant disputes, does not relate
    to defendant’s claim that disclosure of the notes was not
    untimely. The claim is not forfeited when, as here, defense
    counsel consistently argued that he was entitled to withhold
    experts’ notes until they testified.
    64
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Third, defendant contends there was no discovery
    violation regarding “other materials relied upon” by Drs. Ney
    and Humphrey. Defendant does not challenge the trial court’s
    ruling that Dr. Humphrey withheld test data from the
    prosecution in violation of section 1054.3. We do not identify
    other discovery violations at issue relating to Dr. Humphrey and
    the parties do not point to any. Regarding disclosures from Dr.
    Ney, the People argue that “other materials” refers to his notes
    on defendant’s mental state — not, as defendant argues, to texts
    or reference works. Neither party offers a citation to the record
    on this point.
    The trial court stated that disclosures from Dr. Ney
    violated the court’s order, issued shortly before his testimony,
    that he produce all material on which he relied. This was
    consistent with the trial court’s earlier rulings that prosecutors
    were not entitled to outstanding defense expert materials until
    they testified and reflected the prosecution’s right to access the
    information for cross-examination, pursuant to Evidence Code
    section 721, rather than for pretrial discovery, pursuant to
    Penal Code section 1054.3. (Cf. People v. Jones (2003) 
    29 Cal.4th 1229
    , 1264 [trial court may order disclosure of unredacted
    defendant statements before testimony of an expert the defense
    “ ‘definitely’ ” will call]; Ledesma, 
    supra,
     39 Cal.4th at p. 695.)
    The trial court also indicated that the discovery sanction
    addressed Dr. Ney’s failure to take notes when interviewing
    defendant just before he testified, a concern similarly outside
    the scope of the discovery statute. We therefore conclude that
    defendant did not violate her discovery obligations regarding
    “materials relied upon” by Dr. Ney.
    Finally, defendant claims the trial court’s instructions
    were unnecessary when the statements that were not timely
    65
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    disclosed were brief, uncomplicated, and in some respects
    unrelated to the guilt phase. Defendant’s argument focusses on
    statements from lay witnesses — Woods, Hill, Albert Lucia, and
    Penny Lucia. After receiving late disclosure of statements from
    Wood and Hill, the prosecutors determined that they did not
    need additional time to prepare to cross-examine them. The
    untimely statement from Albert Lucia addressed an incident the
    court later ruled was irrelevant.       And the prosecutors
    determined that having received Penny Lucia’s statement
    before she testified, no further sanction was warranted.
    Although defendant does not address the impact of withholding
    Dr. Humphrey’s normative data or Dr. Ney’s reports, it appears
    the prosecution had little trouble managing the late disclosure
    of lay statements.
    To summarize, the trial court twice instructed the jury
    concerning discovery violations regarding lay witnesses: the
    first time naming Woods, Hill, Albert Lucia, Penny Lucia,
    Morris, and Lenore Frey; and the second time naming just
    Woods, Hill, and Albert Lucia. We have concluded that there
    was no discovery violation regarding statements from Morris
    and Frey and, as we have just observed, the prosecutors at trial
    appeared unaffected by delayed statements from the remaining
    four lay witnesses.
    Regarding expert witnesses, the trial court instructed the
    jury that defendant failed to timely disclose “[r]eadable notes
    and reports and other materials relied upon” by Drs. Ney and
    Humphrey. We have concluded that the notes at issue here were
    not discoverable pursuant to section 1054.3, readable or
    otherwise. We have also determined that there was no discovery
    violation in defense counsel’s disclosure of “other materials
    relied upon” by Dr. Ney. In other words, discovery violations
    66
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    regarding defense expert materials were limited to reports by
    Dr. Ney and test data from Dr. Humphrey.
    ii. Instruction on specific discovery violations
    Defendant contends that by citing alleged defense failures
    that were not discovery violations and referring to discovery
    violations that did not hinder the prosecution, the trial court’s
    instructions to the jury were arbitrary, disproportionate,
    unwarranted, and deprived her of a fair trial and due process.
    Defendant further claims that the trial court erred by
    instructing the jury with CALJIC former No. 2.28.
    The trial court commented generally on discovery
    compliance and delays by the defense and also instructed the
    jury about specific discovery violations. We address the trial
    court’s general comments relating to discovery compliance in
    conjunction with defendant’s claims regarding judicial
    misconduct, post, part II.D. Concerning the specific discovery
    violations, we conclude that it was error to instruct the jury with
    CALJIC former No. 2.28, given the deficiencies we have
    identified in that instruction (People v. Thomas (2011)
    
    51 Cal.4th 449
    , 483 (Thomas)) and the scope of discovery
    violations in defendant’s case.
    First, the instruction informed the jury that the
    “defendant” concealed and failed to timely disclose evidence
    when there was no indication defendant played any such role.
    It was therefore “ ‘misleading to suggest that “the defendant”
    bore any responsibility’ [citation] for [her] attorney’s failure to
    provide discovery.” (Thomas, 
    supra,
     51 Cal.4th at p. 483.)
    Second, although the instruction indicated that
    concealment and late disclosure could affect the prosecution,
    there was no evidence that this “had actually deprived the
    67
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    prosecutor ‘of the chance to subpoena witnesses or marshal
    evidence in rebuttal.’ ” (Thomas, 
    supra,
     51 Cal.4th at p. 483.)
    This was particularly true in defendant’s case, where the trial
    court instructed jurors to consider late disclosures: for Morris
    and Frey, although there was no discovery violation related to
    their statements; for Wood, Hill, and Penny Lucia, although the
    prosecution claimed it was unaffected by the timing of their
    disclosures; for Albert Lucia, whose statement the court later
    found irrelevant; and for a broadly articulated category of
    “readable notes” and “other material” from Drs. Humphrey and
    Ney that was, on review, inapplicable.
    Finally, the instruction “was deficient in informing the
    jury that ‘ “[t]he weight and significance of any delayed
    disclosure are matters for your consideration,” ’ because it
    offered ‘no guidance on how this failure might legitimately affect
    their deliberations.’ ” (Thomas, supra, 51 Cal.4th at p. 483.)
    iii. Prejudice
    Defendant asserts the erroneous discovery instructions
    constitute structural error. “ ‘[M]ost constitutional errors can be
    harmless.’ [Citation.] ‘[I]f the defendant had counsel and was
    tried by an impartial adjudicator, there is a strong presumption
    that any other [constitutional] errors that may have occurred
    are subject to harmless-error analysis.’ ” (Neder v. United States
    (1999) 
    527 U.S. 1
    , 8.) We have therefore recognized that
    structural error is limited to circumstances in which the error
    “necessarily affected the whole framework within which the
    trial proceeded” or “defies analysis for prejudice.” (People v.
    Mendoza (2016) 
    62 Cal.4th 856
    , 901.)            Neither of these
    conditions apply here.
    68
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    We conclude that it is not reasonably probable that an
    outcome more favorable to defendant would have resulted
    absent the error (People v. Watson (1956) 
    46 Cal.2d 818
    , 836),
    and any federal constitutional error was harmless beyond a
    reasonable doubt (Chapman v. California (1967) 
    386 U.S. 18
    ,
    24).
    Defendant did not dispute starting the fire that killed her
    children and instead testified that she did not remember
    starting it or sending letters that appeared to reference her
    planned murder-suicide. There were significant reasons to
    doubt her defense of experiencing a dissociative state that
    rendered her unconscious on the night of the fire. Defense
    experts gave different explanations for defendant’s condition, at
    times contradicting each other. There was evidence that
    defendant wrote letters, drove to the post office, and poured and
    lit gasoline throughout her house, all while allegedly
    unconscious. Defendant also displayed a selective memory of
    the evening, remembering some events but not others.
    Defendant’s son testified regarding her apparent planning for
    the crime, describing her insistence that the children sleep
    together in the kitchen the night she set the fire. The jury took
    less than a day to reach its verdict.
    The prosecution briefly referenced the discovery violations
    in closing and argued that the defense was trying to obstruct the
    prosecution’s preparation. We conclude, however, that when, as
    here, the defense was “highly improbable,” the case was “not
    close,” and the jury reached its verdict quickly, the erroneous
    instruction was harmless. (Thomas, 
    supra,
     51 Cal.4th at
    p. 484.)
    69
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    8. Failure to instruct on lesser included offenses
    Defendant contends the trial court erred by failing to
    instruct the jury on involuntary manslaughter as a lesser
    included offense of murder. She claims the jury could have
    (1) concluded that she was unconscious due to her voluntary
    intoxication or (2) found her guilty of a misdemeanor for
    unlawfully causing a fire, and that either of these findings
    supported the lesser included offense of involuntary
    manslaughter. We reject these claims.
    Investigators found two beer bottles and two wine cooler
    bottles in defendant’s trash following the fire. Defendant
    testified that she did not remember how much she drank and
    her friend also “had a couple of drinks” while at her house. The
    trial court found no evidence that defendant was unconscious
    due to her ingestion of alcohol. Defense counsel initially sought
    an involuntary manslaughter instruction but later argued the
    instruction was not warranted because defendant did not
    anticipate the use of prescription medication would cause
    delirium or unconsciousness, a result experts explained was
    quite rare.
    The trial court did not give an involuntary manslaughter
    instruction but instructed the jury to consider defendant’s
    voluntary intoxication in deciding whether defendant possessed
    the required specific intent or mental state at the time of the
    charged crimes and special circumstances. The trial court also
    instructed the jury that if defendant was not conscious but
    acting “while asleep or while suffering from a delirium, a fever,
    or because of an attack of epilepsy, a blow on the head, the
    involuntary taking of drugs, or the involuntary consumption of
    intoxicating liquor, or any similar cause” she could not be found
    70
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    guilty.
    Defense counsel requested instruction on the lesser
    included offense of arson, arguing that defendant could be found
    guilty of negligently spilling gasoline, a misdemeanor. The trial
    court found no evidence to support a lesser included offense and
    rejected counsel’s argument as “ridiculous.”
    “A trial court must instruct the jury on a lesser included
    offense, whether or not the defendant so requests, whenever
    evidence that the defendant is guilty of only the lesser offense is
    substantial enough to merit consideration by the jury.” (People
    v. Halvorsen (2007) 
    42 Cal.4th 379
    , 414, fn. omitted.) The
    obligation to give an instruction on lesser included offenses
    exists even when a defendant expressly objects to it. (People v.
    Souza (2012) 
    54 Cal.4th 90
    , 114.) We review de novo the trial
    court’s determination. (People v. Cole (2004) 
    33 Cal.4th 1158
    ,
    1218.)
    Involuntary manslaughter is “the unlawful killing of a
    human being without malice . . . in the commission of an
    unlawful act, not amounting to a felony; or in the commission of
    a lawful act which might produce death, in an unlawful manner,
    or without due caution and circumspection.” (§ 192, subd. (b).)
    “Unconsciousness,      if    not    induced      by    voluntary
    intoxication, is a complete defense to a criminal charge.” (People
    v. Halvorsen, 
    supra,
     42 Cal.4th at p. 417; see also Penal Code,
    § 26.) However, “[w]hen a person renders himself or herself
    unconscious through voluntary intoxication and kills in that
    state, the killing is attributed to his or her negligence in self-
    intoxicating to that point, and is treated as involuntary
    manslaughter.” (People v. Ochoa (1998) 
    19 Cal.4th 353
    , 423;
    People v. Rangel (2016) 
    62 Cal.4th 1192
    , 1227.) Intoxication
    71
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    may not be voluntary when an individual used prescription
    medication but “did not know or have reason to anticipate the
    drug’s intoxicating effects.”   (People v. Mathson (2012)
    
    210 Cal.App.4th 1297
    , 1313; see also People v. Chaffey (1994)
    
    25 Cal.App.4th 852
    , 856.)
    A person is guilty of arson when “she willfully and
    maliciously sets fire to or burns . . . any structure, forest land,
    or property.” (§ 451.) A person is guilty of “unlawfully causing
    a fire” when she “recklessly sets fire to or burns or causes to be
    burned, any structure, forest land or property.” (§ 452.) Under
    section 452, it is a felony to unlawfully cause a fire that results
    in great bodily injury (§ 452, subd. (a)), burns an inhabited
    structure or inhabited property (§ 452, subd. (b)), or sets fire to
    a structure or forest land (§ 452, subd. (c)), and it is a
    misdemeanor to cause a fire to property (§ 452, subd. (d)).
    We conclude there was insufficient evidence to support an
    involuntary manslaughter instruction based on voluntary
    intoxication. There is no substantial evidence of alcohol
    intoxication; instead, the record reflects that defendant
    consumed “relatively small amounts of alcohol” (People v.
    Flannel (1979) 
    25 Cal.3d 668
    , 685) and no evidence suggested
    that it affected her consciousness. As defense counsel argued,
    any intoxication defendant experienced from prescription
    medications was involuntary as a matter of applicable law if
    defendant was unaware of a potentially intoxicating and rare
    drug interaction. (People v. Chaffey, supra, 25 Cal.App.4th at
    p. 856.) The trial court properly instructed the jury that
    involuntary intoxication, if proved, would be a complete defense.
    We also find no evidence to support a misdemeanor for
    causing the fire. Even if we were to assume that unlawfully
    72
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    setting fire to the house is a lesser included offense of arson
    (People v. Cole, 
    supra,
     33 Cal.4th at p. 1218) and that
    defendant’s actions were reckless rather than willful, the
    evidence established that a fire set to burn an inhabited
    structure killed four children, thus constituting felonies under
    section 452.       Although we have recognized that “an
    unintentional homicide committed in the course of a
    noninherently dangerous felony may properly support a
    conviction of involuntary manslaughter” (People v. Burroughs
    (1984) 
    35 Cal.3d 824
    , 835), setting fire to an inhabited structure
    “ ‘by its very nature . . . cannot be committed without creating a
    substantial risk that someone will be killed’ ” (People v. Howard
    (2005) 
    34 Cal.4th 1129
    , 1135–1136) — and is hence inherently
    dangerous (see Cole, at p. 1218).
    9. Lying-in-wait special circumstance
    Defendant initially contends the lying-in-wait special
    circumstance is unconstitutional because it fails to adequately
    perform the narrowing function required by the Eighth
    Amendment. We have repeatedly rejected this claim (People v.
    Smith (2018) 
    4 Cal.5th 1134
    , 1178; People v. Delgado (2017)
    
    2 Cal.5th 544
    , 576; People v. Casares (2016) 
    62 Cal.4th 808
    , 849),
    and decline to reconsider the issue here. Defendant also argues
    that the evidence at her trial was insufficient to support the
    lying-in-wait special circumstances because the jury would have
    had to speculate about the timing of relevant events to find those
    allegations true. We reject this argument as well.
    “To determine whether the evidence supports a special
    circumstance finding, we must review ‘ “the entire record in the
    light most favorable to the judgment to determine whether it
    discloses evidence that is reasonable, credible, and of solid value
    73
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    such that a reasonable jury could find” ’ the special circumstance
    allegation true ‘ “beyond a reasonable doubt.” ’ ” (People v.
    Becerrada (2017) 
    2 Cal.5th 1009
    , 1028.)
    At the time of defendant’s crime, “the special circumstance
    of murder while lying in wait (former § 190.2, subd. (a)(15))
    required     ‘an   intentional   murder,     committed      under
    circumstances which include (1) a concealment of purpose, (2) a
    substantial period of watching and waiting for an opportune
    time to act, and (3) immediately thereafter, a surprise attack on
    an unsuspecting victim from a position of advantage.’ ” (People
    v. Casares, supra, 62 Cal.4th at p. 827.) “ ‘ “If there is a clear
    interruption separating the period of lying in wait from the
    period during which the killing takes place, so that there is
    neither an immediate killing nor a continuous flow of the
    uninterrupted lethal events, the special circumstance is not
    proved.” ’ ” (People v. Streeter (2012) 
    54 Cal.4th 205
    , 248.)
    Evidence is insufficient to support a lying-in-wait special
    circumstance when the theory of surprise requires a specific
    sequence of events that “cannot be pinpointed” by the evidence.
    (People v. Carter (2005) 
    36 Cal.4th 1215
    , 1262; see also People v.
    Becerrada, supra, 2 Cal.5th at p. 1029.)
    Defendant argues that evidence of lying in wait was
    insufficient because the evidence did not establish when the fire
    began or what defendant was doing immediately before it
    started.    Given the evidence, however, “the jury could
    reasonably find no lapse in defendant’s culpable mental state
    between the homicide and the period of watchful waiting.”
    (People v. Streeter, supra, 54 Cal.4th at p. 249.)
    On the night of the fire, defendant announced a “slumber
    party” in the kitchen, which was unusual. Defendant’s son,
    74
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    F.D., did not want to sleep in the kitchen but she insisted.
    During the evening, defendant wrote and mailed letters that
    appeared to reveal a plan to kill herself and her children. F.D.
    did not think he had been asleep for very long when he and his
    sisters woke up coughing from the fire and his mother told them
    to stay where they were. From this evidence the jury could
    reasonably find a “continuous flow” of lethal events in which
    defendant concealed her purpose and waited until her children
    fell asleep so that she could set a fire to kill them and herself.
    This satisfies the elements of the charged lying-in-wait special
    circumstances.
    10. Arson-murder special circumstance
    Defendant contends the evidence was insufficient to
    support the “independent felonious intent required for the
    arson-murder special circumstance.” (People v. Mendoza (2000)
    
    24 Cal.4th 130
    , 183 (Mendoza).) “The requirement of an
    independent felonious purpose applies to felony-murder special-
    circumstance findings under section 190.2, subdivision (a)(17).
    [Citation.] This subdivision authorizes a special circumstance
    finding when the murder ‘was committed while the defendant
    was engaged in . . . the commission of [or] the attempted
    commission of’ various other specified felonies. (§ 190.2, subd.
    (a)(17).)” (People v. Powell, supra, 5 Cal.5th at p. 953.)
    As we explained in Mendoza, “[a] felony-murder special
    circumstance, such as arson murder, may be alleged when the
    murder occurs during the commission of the felony, not when
    the felony occurs during the commission of a murder.
    [Citations.]   Thus, to prove a felony-murder special-
    circumstance allegation, the prosecution must show that the
    defendant had an independent purpose for the commission of
    75
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the felony, that is, the commission of the felony was not merely
    incidental to an intended murder.” (Mendoza, 
    supra,
     24 Cal.4th
    at p. 182.) “Concurrent intent to kill and to commit an
    independent felony will support a felony-murder special
    circumstance.” (Id. at p. 183; see also People v. Raley (1992)
    
    2 Cal.4th 870
    , 903.) We must therefore determine whether,
    viewing the evidence in the light most favorable to the
    prosecution, “any rational trier of fact could have concluded that
    defendant had a purpose for the arson apart from the murder.”
    (Mendoza, at p. 183.)
    Defendant argues that the prosecution was required to
    show that she committed murder “to advance” the independent
    purpose of committing arson, citing People v. Green (1980)
    
    27 Cal.3d 1
    , 61. In Green, we concluded that a murder “to
    advance an independent felonious purpose” satisfied special
    circumstance requirements whereas a felony “merely incidental
    to the murder” did not. (Ibid.) We have explained, however,
    that “[t]here is nothing magical about the phrase ‘to carry out or
    advance’ the felony.” (People v. Horning (2004) 
    34 Cal.4th 871
    ,
    908.) A jury “ ‘ “is not required to assign a hierarchy to the
    defendant’s motives . . . [and] need only determine whether
    commission of the underlying felony was or was not merely
    incidental to the murder.” ’ ” (People v. Powell, supra, 5 Cal.5th
    at p. 955.)
    Here, there is substantial evidence from which the jury
    could have concluded that defendant’s “purpose for the arson
    apart from the murder” was suicide.             (Mendoza, 
    supra,
    24 Cal.4th at p. 183.) In a note to her ex-husband sent just
    before the fire, defendant wrote, “Now you don’t have to support
    any of us!” She sent a letter to her ex-boyfriend at the same
    time, stating, “I can’t live without you in my life.” After lighting
    76
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    gasoline throughout the house, defendant lay down with her
    children and stayed with them while the fire and smoke
    overwhelmed them; at one point when he regained
    consciousness, defendant’s son saw that she was unconscious on
    the floor with his sisters.     In her testimony, defendant
    acknowledged that she had contemplated suicide most of her
    life.
    Because killing oneself is a purpose separate from killing
    one’s victims, we conclude the evidence is sufficient to establish
    that defendant committed arson with “independent, albeit
    concurrent, goals” of killing herself and killing her children.
    (Mendoza, 
    supra,
     24 Cal.4th at p. 183.)
    Defendant also argues that the arson-murder special
    circumstance instructions regarding the “independent felonious
    purpose” requirement were confusing and misleading and failed
    to adequately advise the jury of the applicable law. The trial
    court modified CALJIC No. 8.81.17, adding a sentence to
    indicate that the arson-murder special circumstance could be
    established when there was a concurrent intent to kill and to
    commit arson: “To find that the special circumstance referred
    to in these instructions as murder in the commission of arson is
    true, it must be proved: (1) the murder was committed while the
    defendant was engaged in the commission of arson, and; (2) the
    murder was committed in order to carry out or advance the
    commission of the crime of arson, or to facilitate the escape
    therefrom, or to avoid detection.         Moreover, this special
    circumstance is still proven if the defendant had the separate
    specific intent to commit the crime of arson, even if she also had
    the specific intent to kill.      In other words, the special
    circumstance referred to in these instructions is not established
    if the arson was merely incidental to the commission of the
    77
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    murder.”
    Defendant acknowledges that the added, italicized
    language was a correct statement of the law, but argues that, as
    a whole, the instruction misled the jury into thinking that a
    concurrent intent to commit arson and to kill could mean that
    the arson was not “merely incidental” to the murder. If the
    jurors reached this conclusion, and they apparently did, it was
    permissible under the law. “We have repeatedly held . . . that a
    defendant’s possession of the intent to kill concurrently with the
    intent necessary to support a predicate felony does not
    necessarily render commission of the predicate felony incidental
    to the murder.” (People v. Powell, supra, 5 Cal.5th at 954.)
    We reject defendant’s claim that the instruction allowed
    the jury to find the arson-murder special circumstance true
    without finding a separate and independent purpose for
    committing arson. “[W]e have never suggested that . . . any
    precise language was required to explain the concept [of
    independent felonious purpose] to the jury” (People v. Horning,
    
    supra,
     34 Cal.4th at p. 908), and we find that the instruction
    given here adequately conveyed the applicable law and
    requirements of the arson-murder special circumstance.
    Defendant argues that the modified instruction given to
    her jury was deficient for the same reasons we found to be error
    in People v. Brents (2012) 
    53 Cal.4th 599
    , 613 (Brents). There,
    the trial court modified the standard instruction, CALJIC
    No. 8.81.17, so that it referred to two different target offenses,
    assault by force and kidnapping. In that context, the first and
    second sentences of the second paragraph did not refer to the
    same target offense and created confusion about what findings
    were required. (Brents, at p. 613.) There could have been no
    78
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    such confusion here. The instructions focused on the proper
    predicate felony — arson — and correctly informed the jury that
    “the special circumstance referred to in these instructions is not
    established if the arson was merely incidental to the commission
    of the murder.” The danger in Brents, that the jury may have
    found the special circumstance satisfied without finding true the
    correct predicate felony, was not present in this trial.
    C. Penalty Phase Issues
    Defendant raises evidentiary challenges to the penalty
    phase of the trial and contends the death penalty was
    disproportionate to her individual culpability. Because we
    ultimately reverse the penalty verdict due to the trial court’s
    misconduct, we need not address each of these challenges.
    (People v. Peterson (2020) 
    10 Cal.5th 409
    , 477.) Instead, we
    discuss here the errors that shed light on the trial court’s
    misconduct — improper exclusion of mitigating evidence and
    erroneous instruction regarding discovery violations — and
    address their prejudicial impact in our analysis of the judicial
    misconduct claim.
    1. Exclusion of mitigation evidence
    Defendant claims the trial court erred when it excluded
    evidence related to neuropsychological testing and PET scan
    results, and erred when it sustained objections to lay witness
    testimony about defendant’s good character. We agree that the
    trial court’s exclusion of this evidence was error.
    “ ‘The Eighth and Fourteenth Amendments require the
    jury in a capital case to hear any relevant mitigating evidence
    that the defendant offers, including “ ‘any aspect of a
    defendant’s character or record and any of the circumstances of
    the offense that the defendant proffers as a basis for a sentence
    79
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    less than death.’ ” ’ ” (People v. Rogers (2013) 
    57 Cal.4th 296
    ,
    346.) “However, while the range of constitutionally pertinent
    mitigation is quite broad [citation], it is not unlimited.” (Carasi,
    
    supra,
     44 Cal.4th at p. 1313). Trial courts retain the authority
    to “ ‘apply[] ordinary rules of evidence to determine whether
    such evidence is admissible’ ” (People v. McDowell (2012)
    
    54 Cal.4th 395
    , 434) and “to exclude, as irrelevant, evidence that
    has no logical bearing on the defendant’s character, prior record,
    or the circumstances of the capital offense” (Carasi, at p. 1313).
    a. Neuropsychological testing expert
    Defendant contends the trial court violated her rights
    under the Eighth and Fourteenth Amendments when it
    excluded testimony by Dr. Kyle Boone regarding defendant’s
    neuropsychological test results and cognitive impairment.
    i. Background
    Before the penalty phase began the trial court noted that
    jurors were “getting a little antsy.” After excusing an alternate
    juror for preplanned travel, and after hearing of a sitting juror’s
    personal scheduling problems, the trial court worried about
    losing jurors and stated its belief that “penalty phase witnesses
    should not take very long.”
    On the first day of defense testimony, counsel informed
    the court and prosecutors that he would be calling a new
    neuropsychological expert, Dr. Kyle Boone, that afternoon. Dr.
    Boone’s report acknowledged that Dr. Humphrey used incorrect
    normative data but concluded that the testing revealed
    “consistent evidence” of defendant’s impaired memory, frontal
    lobe skills, and math ability, but otherwise showed average
    scores and intelligence. The defense estimated Dr. Boone’s
    testimony would take about 45 minutes and would rehabilitate
    80
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Dr. Humphrey’s findings, show the impact of defendant’s
    impairment on her life, evoke sympathy, and explain, if not
    excuse, the crime.
    The prosecutors strenuously objected to Dr. Boone’s
    testimony. They argued that Dr. Humphrey’s testimony had
    already addressed section 190.3, factor (k) evidence and that
    they would need a lengthy continuance to prepare if Dr. Boone
    testified.
    The trial court ruled that Dr. Boone’s testimony would be
    cumulative, “take days,” and involve an undue consumption of
    time, noting that, at any rate, Dr. Boone would not be allowed
    to testify about how Dr. Humphrey obtained the wrong
    normative data because such testimony would be speculative.
    ii. Analysis
    In excluding Dr. Boone’s testimony, the trial court
    implicitly engaged in analysis under Evidence Code section 352
    and found that concerns regarding delay “substantially
    outweighed” the probative value of the evidence. (Evid. Code,
    § 352; People v. Villatoro (2012) 
    54 Cal.4th 1152
    , 1168.) A trial
    court may exclude from the penalty phase “ ‘ “particular items
    of evidence” . . . [that are] misleading, cumulative, or unduly
    inflammatory.’ ” (People v. Smith (2005) 
    35 Cal.4th 334
    , 357),
    although evidence “ ‘identical in subject matter to other
    evidence should not be excluded as “cumulative” when it has
    greater evidentiary weight or probative value.’ ” (People v.
    McKinnon (2011) 
    52 Cal.4th 610
    , 669; see also Skipper v. South
    Carolina (1986) 
    476 U.S. 1
    , 8).
    Defendant cites People v. Lucero (1988) 
    44 Cal.3d 1006
    , in
    support of her claim that she was entitled to have the jury
    consider Dr. Boone’s testimony. There, we addressed the
    81
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    exclusion of expert testimony about a defendant’s mental
    condition in the penalty phase. Although one defense expert
    was allowed to testify about the condition, we declined to find
    similar testimony by a second expert cumulative when there
    was “considerable debate” regarding the methods by which the
    first examiner reached his conclusions. (Id. at pp. 1031–1032.)
    We also observed that when the prosecution seeks to impeach
    the testimony of the first defense expert, it might be “very
    important for defendant to be able to show that not only one, but
    two mental health experts” had reached the same conclusion.
    (Id. at p. 1031.)
    Dr. Humphrey was the only expert to testify about
    cognitive impairment that may have been related to defendant’s
    childhood abuse and seizures. The People argue that Dr.
    Boone’s testimony was properly excluded because it would have
    merely repeated Dr. Humphrey’s conclusions. As defendant
    argued, however, Dr. Boone’s testimony would have addressed
    defendant’s mental condition as a mitigating factor and was
    therefore distinct from evidence presented in the guilt phase.
    Furthermore, impeachment and rebuttal of Dr. Humphrey’s
    testimony raised significant questions about her credibility. (Cf.
    People v. Kennedy (2005) 
    36 Cal.4th 595
    , 632.) Testimony from
    Dr. Boone had the potential to carry greater evidentiary weight
    and was not merely cumulative. (People v. McKinnon, supra, 52
    Cal.4th at p. 669; People v. Lucero, supra, 44 Cal.3d at p. 1031.)
    The probative value of Dr. Boone’s testimony was also
    relatively substantial, given that expert assessment of
    neuropsychological test data was both necessary and relevant to
    establishing mitigating factors related to defendant’s mental
    functioning. (People v. Steele (2002) 
    27 Cal.4th 1230
    , 1282–
    1283.) The high court has reiterated that “ ‘ “defendants who
    82
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    commit criminal acts that are attributable . . . to emotional and
    mental problems, may be less culpable than defendants who
    have no such excuse.” ’ ” (Abdul-Kabir v. Quarterman (2007)
    
    550 U.S. 233
    , 251–252.) This concern is reflected in section
    190.3, factor (k), which directs the jury to consider “ ‘any other
    circumstance which extenuates the gravity of the crime,’ [and]
    therefore allows consideration of any mental or emotional
    condition.” (People v. Cox (2003) 
    30 Cal.4th 916
    , 966.) The
    testimony was also probative of defendant’s state of mind under
    section 190.3, factor (a). (People v. Guerra, 
    supra,
     37 Cal.4th at
    p. 1154.)
    We next consider whether undue consumption of time
    “substantially outweighed” the probative value of Dr. Boone’s
    testimony. (Evid. Code, § 352.) In People v. Fuiava (2012)
    
    53 Cal.4th 622
    , we concluded the trial court did not err when it
    excluded mitigation evidence regarding the settlement of
    lawsuits that alleged misconduct by sheriff’s deputies and was
    offered to support defendant’s reasonable fear of them. (Id. at
    p. 723.) The probative value of such evidence depended on
    establishing the merits of the lawsuits notwithstanding the
    settlement, and we concluded the trial court acted well within
    its discretion to prevent “trials within a trial” that would have
    required an undue investment of time and “might have
    unreasonably distracted the jury.” (Ibid.)
    No such similar complications accompanied the
    presentation of Dr. Boone’s testimony, which was directly
    related to relevant mitigating considerations. The trial court
    indicated that it would not allow Dr. Boone to address Dr.
    Humphrey’s reasons for using improper normative data and
    could have further limited other potentially distracting
    testimony that focused on Dr. Humphrey’s reputation rather
    83
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    than defendant’s test results and functioning. The defense
    estimated that direct testimony would take under an hour. The
    trial court anticipated that the prosecution response and other
    issues related to the testimony would extend the time needed to
    a matter of days. The trial court worried about having to excuse
    jurors, but three alternate jurors were available to “guard
    against the risk of a mistrial [had] a juror become unable to
    serve.” (People v. Cottle (2006) 
    39 Cal.4th 246
    , 258; see also
    § 1089; Larios v. Superior Court of Ventura County (1979)
    
    24 Cal.3d 324
    , 332 [no legal necessity for mistrial when
    alternate juror is available].)
    “ ‘A trial court’s exercise of discretion under [Evidence
    Code] section 352 will be upheld on appeal unless the court
    abused its discretion, that is, unless it exercised its discretion in
    an arbitrary, capricious, or patently absurd manner.’ ” (People
    v. Johnson (2019) 
    8 Cal.5th 475
    , 521.) When “a specific statute
    affects the extent and nature of a trial court’s discretion, we
    examine a trial court’s actions in light of the specific law bearing
    on that discretion.” (People v. Rodriguez (2016) 
    1 Cal.5th 676
    ,
    685.) Section 190.3 expressly authorizes the presentation of
    “any matter” relevant to mitigation, including “defendant’s
    character, background, history, mental condition and physical
    condition” (§ 190.3), and a trial court’s discretion to limit
    mitigating evidence is informed by this broad charge (see People
    v. Spencer (2018) 
    5 Cal.5th 642
    , 680). In this context, we
    conclude the trial court’s exclusion of relevant, non-cumulative,
    expert testimony about defendant’s mental condition was an
    abuse of discretion.
    84
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    b. PET scan results
    Defendant contends the trial court’s ruling excluding PET
    scan evidence from the penalty phase denied her rights to
    present a meaningful defense, to offer mitigating evidence, and
    to a reliable sentence in violation of the Sixth, Eighth, and
    Fourteenth Amendments.
    Defense experts concluded that defendant’s PET scan
    showed abnormality in regions of her brain that could affect her
    judgment, memory, and ability to interpret data, among other
    functions, and that impairment in those areas would be
    consistent with defendant’s neuropsychological testing. In
    arguing for the admission of PET scan evidence in the penalty
    phase, the defense stated that “[w]e are not trying to present a
    diagnosis of a particular mental illness or disease. [¶] . . . If
    they feel sympathy for her because she has a defect or an
    abnormality in her brain, even though, hypothetically, we could
    not reliably show a connection with the crime or even her day-
    to-day behavior, they could still feel sympathy for her.” The
    prosecution objected to the evidence under Kelly and Evidence
    Code section 352.
    The trial court determined that the PET scan evidence
    could be used only if scientific consensus recognized a reliable
    correlation between the scan and a particular condition, and
    that although mental and emotional conditions were admissible
    under factor (k), the PET scan did not reliably show any such
    condition. The trial court ruled that the evidence would also be
    excluded under Evidence Code section 352 because it had little
    probative value and would cause undue consumption of time
    and confusion of issues.
    85
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    As we observed when addressing the exclusion of PET
    scan results from the guilt phase, the evidence established that
    PET scans had been used for decades to evaluate brain
    abnormality. The trial court’s reliance on Kelly to exclude the
    evidence from the penalty phase, as in the guilt phase, was
    therefore error. We concluded the evidence of brain abnormality
    had little probative value in the guilt phase because it was not
    possible to associate it with any condition or behavior affecting
    defendant at the time of the crime. The scope of mitigating
    evidence admissible in the penalty phase differs, however, and
    is “quite broad.” (Carasi, 
    supra,
     44 Cal.4th at p. 1313; see
    § 190.3.)
    Thus, whether or not specifically related to her crime,
    evidence of defendant’s brain damage was relevant in the
    penalty phase (see People v. Smith, 
    supra,
     35 Cal.4th at p. 359),
    and it would have contributed to defense efforts to portray
    defendant as a woman of limited mental resources who broke
    down in a time of adversity. “Because ‘at the penalty phase the
    jury decides a question the resolution of which turns . . . on the
    jury’s moral assessment,’ ‘[i]t is not only appropriate, but
    necessary, that the jury weigh the sympathetic elements of
    defendant’s background against those that may offend the
    conscience.’ ” (People v. Spencer, supra, 5 Cal.5th at p. 680.)
    Given “how circumscribed is the court’s discretion to exclude
    evidence at the penalty phase” (id.), we conclude that the trial
    court erred when it excluded defendant’s PET scan results.
    c. Character witness testimony
    Defendant contends the trial court erred in sustaining
    objections to defense questioning of lay witnesses and thus
    86
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    excluded relevant mitigating testimony in violation of her
    federal constitutional rights.
    Defendant asserts the trial court erred by preventing
    defense witnesses from telling the jury what they valued about
    defendant. The trial court sustained relevance objections to
    questions posed to three of defendant’s friends regarding what
    they would miss about her and the value she brought to their
    lives, and to questions for a jail chaplain and Albert Lucia
    addressing whether defendant could be a help to others.
    Defense counsel argued that such testimony was relevant under
    section 190.3, factor (k), and that witnesses should be allowed to
    express their feelings about defendant “as a friend, as a
    companion.”
    Evidence that a defendant “ ‘is loved by family members
    or others, and that these individuals want him or her to live . . .
    is relevant because it constitutes indirect evidence of the
    defendant’s character.’ ” (People v. Rices (2017) 
    4 Cal.5th 49
    , 88.)
    It was therefore error to exclude as irrelevant testimony that
    witnesses valued defendant’s friendship and felt she had
    potential to help others. (People v. Whitt (1990) 
    51 Cal.3d 620
    ,
    647 [questions were “not facially irrelevant” when the “range of
    constitutionally pertinent mitigation is so broad”].)
    The trial court also sustained objections based on
    relevance when defense counsel tried to elicit testimony from
    defendant’s friends that she was a nonviolent person and that
    the crime was out of character for her. As we have noted,
    however, “ ‘[t]he Eighth and Fourteenth Amendments require
    the jury in a capital case to hear any relevant mitigating
    evidence that the defendant offers, including “ ‘any aspect of a
    defendant’s character . . . that the defendant proffers as a basis
    87
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    for a sentence less than death.’ ” ’ ” (People v. Rogers, supra,
    57 Cal.4th at p. 346.) Character evidence regarding defendant’s
    nonviolence was relevant in mitigation and it was error to
    exclude it.
    A chaplain from the jail testified about defendant’s
    remorse.     Defendant contends the trial court improperly
    sustained relevance objections to questions supporting the
    chaplain’s credibility — including how infrequently she testified
    for the thousands of inmates to whom she ministered and
    whether she believed in the death penalty. We agree. Such
    questions were relevant and admissible (Evid. Code, §§ 210,
    351, 780, subds. (c), (f), (j)) and should have been allowed.
    2. Instructional error related to discovery violations
    Defendant contends the trial court erred by finding that
    the defense violated discovery obligations and by instructing the
    jury to consider those alleged violations, and that these asserted
    errors violated her statutory and constitutional rights. We
    conclude that giving the instruction was indeed error.
    Less than a week before the start of the penalty phase, the
    defense for the first time provided contact information for eight
    penalty witnesses, along with their corresponding statements
    and documents, most of which were one to two years old.
    Counsel explained that when the trial court excluded the PET
    scan evidence from the penalty phase, the defense decided to call
    additional witnesses, prompting the new disclosures. The trial
    court found the explanation implausible and concluded the
    defense had willfully delayed disclosure. The trial court stated
    it would initiate contempt proceedings against defense counsel
    for discovery violations and instruct the jury with CALJIC
    No. 2.28 regarding the late disclosure.
    88
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    When the prosecutors subsequently notified the defense of
    ten new witnesses, the trial court rejected defense counsel’s
    request for a continuance to investigate them. Dismissing
    counsel’s argument that the prosecution should be sanctioned
    for late discovery, the trial court stated, “[M]aybe they will just
    call Mr. Folden and Mr. Nieves, and these are people that you’ve
    known about for two years.” Prosecutors later confirmed their
    intention to call three of the new witnesses.
    The trial court included CALJIC former No. 2.28 among
    the penalty phase instructions, informing the jury as follows: “In
    this case, the defendant failed to timely disclose the following
    evidence: [¶] 1. The name and address of witnesses Lelia
    Mrotzek and Lynn Jones. [¶] 2. The name and address and
    statements of witnesses Shirley Driskell, Cindy Hall, Carl Hall,
    Shannon North, Tammy Pearce and Tricia Mulder. [¶] . . . .
    The weight and significance of any delayed disclosure are
    matters for your consideration. [¶] However, you should
    consider whether the untimely disclosed evidence pertains to a
    fact of importance, something trivial, or subject matters already
    established by other credible evidence.”
    “A trial court’s discovery rulings are reviewed for abuse of
    discretion. [Citation.] The trial court possesses the discretion
    to determine what sanction is appropriate to ensure a fair trial.”
    (People v. Mora and Rangel (2018) 
    5 Cal.5th 442
    , 466.) We
    review for substantial evidence the trial court’s decisions
    regarding compliance with discovery disclosure requirements.
    (People v. Riggs, 
    supra,
     44 Cal.4th at p. 306.)
    Preliminarily, we note that under section 1054.5 court
    discretion to advise the jury about untimely disclosures is
    conditional “upon a showing that the moving party complied
    89
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    with the informal discovery procedure.” (§ 1054.5, subd. (b).)
    Here the record reflects late discovery disclosures by the
    prosecution, the moving party — yet the record reflects no
    explanation for that delay. The necessary showing of informal
    discovery compliance by the moving party is not apparent.
    Under these circumstances, it appears the trial court exceeded
    its discretion by advising the jury of late disclosures.
    The trial court erred by instructing the jury pursuant to
    CALJIC former No. 2.28. The deficiencies we identified with the
    instruction in the guilt phase were also present in the penalty
    phase: the instruction was misleading by twice informing the
    jury that “defendant” was at fault for delayed disclosure,
    suggesting without evidence that the delay affected the
    prosecution case, and by directing the jurors to consider
    defendant’s unlawful conduct without guidance concerning how
    it might legitimately affect their deliberations. (Thomas, supra,
    51 Cal.4th at pp. 483–484.)
    Defendant contends that by faulting her for discovery
    violations during the penalty phase, the instruction also
    impermissibly set forth a nonstatutory aggravating factor for
    the jury’s consideration. We agree. “The penalty jury may
    consider in aggravation only matters coming within one of
    section 190.3’s factors.” (People v. Cordova (2015) 
    62 Cal.4th 104
    , 140.) Accordingly, “ ‘[a]ggravating evidence must pertain
    to the circumstances of the capital offense (§ 190.3, factor (a)),
    other violent criminal conduct by the defendant (id., factor (b))
    or prior felony convictions (id., factor (c)); only these three
    factors, and the experiential or moral implications of the
    defendant’s age (id., factor (i)), are properly considered in
    aggravation of penalty. . . . ’ ” (People v. Nelson (2011) 
    51 Cal.4th 198
    , 222.) The trial court therefore erred by using an instruction
    90
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    during the penalty phase that put before the jury bad acts
    attributed to defendant but unrelated to statutorily permissible
    considerations. (People v. Carter (2003) 
    30 Cal.4th 1166
    , 1202;
    People v. Avena (1996) 
    13 Cal.4th 394
    , 439.)
    Although we have engaged in harmless error analysis
    concerning similarly erroneous instructions in the guilt phase
    (Thomas, 
    supra,
     51 Cal.4th at p. 484; Riggs, 
    supra,
     44 Cal.4th
    at p. 311), we have not addressed such error in the penalty phase
    of a capital trial (cf. People v. Peoples, supra, 62 Cal.4th at
    p. 767). Defendant argues that the instruction in the penalty
    phase constitutes structural error, citing Sullivan v. Louisiana
    (1993) 
    508 U.S. 275
    . In Sullivan, the high court ruled that
    erroneous instruction on the meaning of “reasonable doubt”
    deprived the defendant of a jury verdict on guilt, a structural
    defect that “ ‘def[ied] analysis by “harmless-error” standards.’ ”
    (Id. at p. 281.)
    Regarding penalty phase errors, the high court has
    condoned the use of harmless error analysis concerning
    instructions that directed a jury to consider an invalid
    aggravating factor (Clemons v. Mississippi (1990) 
    494 U.S. 738
    ,
    741; see also People v. Lewis (2008) 
    43 Cal.4th 415
    , 531), and we
    have reviewed for harmlessness a trial court’s error in
    instructing a penalty phase jury on witness credibility (People v.
    Mitchell (2019) 
    7 Cal.5th 561
    , 587). The instructional error here
    is akin to these circumstances and is not a structural error that
    “rendered the trial ‘fundamentally unfair’ ” or was “ ‘necessarily
    unquantifiable and indeterminate.’ ” (People v. Aranda (2012)
    
    55 Cal.4th 342
    , 366, italics omitted.)
    We consider the prejudicial effect of this instructional
    error, and the errors we have identified in the exclusion of
    91
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    mitigating evidence, in the following sections concerning the
    trial judge’s misconduct.
    D. Judicial Misconduct
    Defendant contends the trial judge was “impatient,
    undignified, and discourteous” to the defense, engaging in
    conduct that established bias and misconduct in violation of her
    state and federal constitutional rights.10 The People argue that
    the trial judge’s apparent intemperance must be viewed in light
    of defense counsel’s “shenanigans,” and indeed, the judge
    characterized the defense as “one of the most unprofessional
    performances” he had ever seen. The trial judge’s response to
    this challenge, however, failed to maintain the high standards
    of fairness we demand.
    We have cautioned that “[t]rial judges ‘should be
    exceedingly discreet in what they say and do in the presence of
    a jury’ ” (Sturm, 
    supra,
     37 Cal.4th at p. 1237) and their
    comments “ ‘must be accurate, temperate, nonargumentative,
    and scrupulously fair’ ” (id. at 1232). “ ‘Although the trial court
    has both the duty and the discretion to control the conduct of the
    trial [citation], the court “commits misconduct if it persistently
    makes discourteous and disparaging remarks to defense counsel
    so as to discredit the defense or create the impression it is
    allying itself with the prosecution” [citation]. Nevertheless, “[i]t
    is well within [a trial court’s] discretion to rebuke an attorney,
    sometimes harshly, when that attorney asks inappropriate
    questions, ignores the court’s instructions, or otherwise engages
    in improper or delaying behavior.” ’ ” (People v. Woodruff (2018)
    
    5 Cal.5th 697
    , 768.)
    10
    The trial judge is now deceased.
    92
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    As the following section details, the trial judge here
    frequently employed a variety of strategies to properly manage
    defense counsel’s noncompliance with court procedures.
    Throughout the trial, however, the trial judge also made
    inappropriately disparaging and sarcastic remarks to defense
    counsel, impugning his performance, chastising him for
    improper behavior, and sanctioning and citing him for contempt
    in front of the jury.
    The trial judge also directed improper comments and
    questions to witnesses, openly doubting the credibility of one
    defense expert by asking argumentative and hostile questions
    and remarking on the possibility that another defense expert
    “just doesn’t know what he’s talking about.” When confronted
    with a juror who had been exposed to extrajudicial information
    that was likely to enhance the credibility of a prosecution expert,
    the trial court revealed the information to the entire jury. In
    the penalty phase, the trial judge needlessly reprimanded and
    belittled a lay witness who testified for the defense.
    We conclude that this conduct by the trial judge reflects “a
    pattern of disparaging defense counsel and defense witnesses in
    the presence of the jury, and convey[ing] the impression that he
    favored the prosecution,” and it therefore constitutes
    misconduct. (Sturm, supra, 37 Cal.4th at p. 1238.) Although
    the misconduct did not prejudicially affect the guilt
    determination, we conclude that it was prejudicial in the penalty
    phase and requires reversal of the penalty judgment.
    1. Treatment of defense counsel
    Defendant contends the trial judge committed misconduct
    by expressing “deep hostility” toward defense counsel at the
    outset of the case and making disparaging comments to him
    93
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    throughout the trial. The record shows that the trial judge spent
    considerable effort attempting to control counsel’s disregard for
    evidentiary rules and orders; it also reveals frequent
    breakdowns in the trial judge’s composure as he faced this
    challenge.
    Although the trial judge’s admonishments to counsel were
    often measured, he also made comments in front of the jury that
    portrayed counsel as engaging in deliberately improper tactics,
    wasting the court’s and jury’s time, purposely misleading the
    jury, and engaging in unlawful conduct subject to sanctions and
    contempt. As we have indicated, we must conclude that the trial
    court’s persistent, discourteous commentary constituted
    misconduct.
    a. Background
    At a break in defense counsel’s opening statement outside
    the presence of the jury, the trial judge warned that much of the
    statement was argument and the he would begin to sustain
    objections on that basis if raised. After sustaining the first
    objections, the judge sent the jury out to warn defense counsel
    again that his opening statement was “way over the line as far
    as argument.”
    During the remaining two hours of the defense opening
    statement, the trial judge sustained 15 of 18 objections to
    improper argument. In the jury’s presence, the judge initially
    reminded counsel to avoid argument with a brief comment:
    “let’s confine ourselves to a statement of what you believe the
    evidence will show, not argument.” When counsel continued to
    draw objections, the judge became more pointed, exclaiming,
    “that is pure argument. Stop it.” As the opening statement
    continued, the judge became sarcastic — after counsel’s
    94
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    reference to evidence showing that defendant had demons to
    overcome, the judge twice chided counsel by asking, “You’re
    going to present evidence of a demon?”
    Throughout the trial, the trial judge regularly but briefly
    admonished defense counsel for violating the court’s rule
    against speaking objections and for making other extraneous or
    argumentative comments. When defense counsel failed to
    observe the rules of evidence during his examination of
    witnesses, the trial judge made periodic comments in front of
    the jury to highlight proper legal parameters. The judge also
    curtly admonished defense counsel to “move on” to a different
    area of questioning on numerous occasions, including when:
    counsel did not have related exhibits ready; after sustaining
    objections to counsel’s questions; when evidentiary issues
    needed to be resolved outside the presence of the jury; and when
    the judge sought to limit topics he found cumulative or an undue
    consumption of time.
    In addition to regular, brief admonitions and other
    comments to control defense counsel’s questioning and
    presentation of evidence, the trial judge periodically expressed
    general impatience and irritation with counsel’s courtroom
    behavior with comments such as: “Why don’t you just ask a
    simple question[?]”; “[D]on’t talk, except to ask a question”; “You
    don’t listen do you?”; “Stop saying ‘ah’ every time you get an
    answer”; “Don’t say ‘okay’ anymore”; “Just ask the question in a
    proper way”; and “What does it take to get the point that you
    can’t talk at the same time [as the witness?]”
    At other times, the trial judge more pointedly portrayed
    defense counsel as inept or wasting time: remarking, “[y]ou are
    using valuable court time for something that doesn’t need to be
    95
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    used”; responding to counsel’s question about an exhibit number
    by stating, “Look at the tag on the front; it might give you a
    clue”; responding to counsel’s question that began, “I appreciate
    the fact that . . .” with, “[w]hat your appreciation level is, is not
    pertinent or helpful”; observing that defense could have done “a
    little legwork” to develop the evidence “rather than doing some
    kind of guessing game”; characterizing counsel’s “ridiculous
    question” as appropriate only for “comic books or the movies”;
    noting counsel was unprepared to examine witnesses;
    exclaiming, “Why didn’t you say that when the jury was out?”;
    referring to counsel’s “tongue wagging” and admonishing him to
    “get on to something meaningful”; urging counsel, “if you get to
    some questions that are proper, you might finish sooner rather
    than later”; noting, “[i]f you thought there was going to be a
    problem, you should have addressed it when we don’t have to
    keep the jury waiting”; raising the court’s own objection to
    counsel’s “nonsensical question”; commenting that the witness
    cannot answer counsel’s question “unless he’s superman and has
    x-ray eyes”; and exclaiming, “Can’t you figure that out before we
    resume?”, among other comments.
    The trial judge also reprimanded counsel in front of the
    jury for offering improper comments and questions, often
    referencing counsel’s violation of prior rulings: “If you don’t
    understand my rulings, I’ll stop the examination now”; “I’ve
    ruled on this in chambers . . . I will not permit you to question
    him further”; “If I have to tell you one more time about no
    speaking objections, we’re going to have a problem, you and I”;
    “That is improper, and you know it”; “You don’t want to [read
    the entire prior question to the witness], so I will to make sure
    it’s accurate”; “Well, you’re wrong . . . just ask questions rather
    than expressing your beliefs”; “[Counsel’s question is] in
    96
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    violation of the court’s order at the 402 hearing”; “I warned you
    repeatedly that you’re not to make extrinsic comments”; “You’re
    not to comment on the evidence, and don’t do it again”; You are
    admonished not to editorialize[] or make gratuitous comments”;
    “[Counsel’s questioning] contravenes the court’s prior ruling”;
    “I’ve warned you repeatedly. Don’t editorialize. Don’t make
    gratuitous comments”; “I have already advised you that you
    can’t say that, and you’re disobeying a lawful court order”;
    “[Counsel’s question is] false and misleading”; “[T]his is a
    violation of the court’s order before the jury came in”; “[D]on’t
    ask questions that call for irrelevant responses and are
    improper questions”; “I warned you not to ask any questions
    that call for hearsay”; and “I’ve warned you, [counsel]. You’re
    not to make any statements in front of the jury. You’re not to
    make speaking objections. You’re not to make comments.”
    The trial judge made a point of telling jurors when counsel
    had been reprimanded outside their presence for his conduct in
    the courtroom — “He’s not supposed to do it[,] I admonished him
    not to do it again” — and when the judge had concerns about
    counsel’s discovery compliance. Although the trial judge later
    decided to formally instruct the jury on discovery violations by
    the defense, upon learning of late disclosures, he immediately
    notified the jury of counsel’s potential wrongdoing, noting that
    he would have to provide “further instructions on this discovery
    noncompliance later on when the issues are more clarified,” and
    stating, “I am going to have to make a decision on whether this
    is a violation of the discovery rules.” After counsel lawfully
    disclosed expert materials midtrial, the trial judge nonetheless
    informed the jury that counsel’s “delay in the disclosure” was to
    blame for a two-week continuance.
    97
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Two times during defense counsel’s opening statement for
    the penalty phase, the trial judge interrupted to reprimand
    counsel in front of the jury. When defense counsel argued in his
    penalty phase closing that defendant’s “personal background
    and the manner and method which she was brought up by her
    mother . . . is also a factor to consider in mitigation,” the trial
    court sustained an objection that counsel misstated the law and
    also remarked that “[t]he statement is a misstatement. The jury
    will disregard it.” The following morning, concluding that the
    defense improperly attempted to count each piece of mitigating
    evidence as a separate statutory factor, the trial court further
    instructed the jurors, informing them that defense counsel was
    “wrong” to suggest that there were numerous “factors” involved
    in factor (k) mitigating evidence.
    Outside the jury’s presence, the trial judge took additional
    measures to control what he viewed as improper behavior,
    threatening to cut off defense questioning he deemed
    inappropriate, requiring additional hearings to preview defense
    evidence and testimony, and imposing sanctions. After repeated
    warnings, the trial judge imposed a $500 sanction pursuant to
    Code of Civil Procedure section 177.5 for defense counsel’s
    speaking objections. The trial judge explained: “I rarely impose
    sanctions on a lawyer, that is not my rule, generally. [¶] But I
    have warned you over and over and over again in this trial no
    speaking objections, and I don’t accept the proposition that you
    don’t understand it. I do not accept the proposition that you are
    incapable of complying with it. You’re not an inexperienced
    attorney, you have trial skills, if you care to use them.”
    The trial judge imposed six additional monetary sanctions
    on defense counsel — one for a discovery violation, three more
    for speaking objections, and two for commenting on testimony
    98
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    and evidence. After observing that the monetary sanctions had
    no effect, the trial judge later cited counsel for contempt for
    additional discovery violations and for commenting on the
    evidence. 11
    Some of the sanctions were levied in the presence of the
    jury. In one instance, the trial judge imposed monetary
    sanctions on counsel for violating a court order. In another,
    after counsel disagreed with a witness, the trial judge informed
    counsel, “I’m citing you for misconduct for making that
    comment, and I’ll cite you later for contempt. . . . I have warned
    you repeatedly about stating your opinion in front of this jury.”
    In eight motions for mistrial and a motion to disqualify the
    trial judge, the defense asserted judicial bias. Near the end of
    the prosecution case-in-chief, defense counsel made an oral
    motion for mistrial, in which he asserted that the trial judge
    believed he was a liar and was therefore placing unfair
    limitations on his cross-examination of witnesses. In another
    motion for mistrial, defense counsel accused the trial judge of
    having a “personal vendetta” against him and denying
    defendant a fair trial. In subsequent motions and objections,
    defense counsel claimed the trial judge: violated defendant’s
    federal and state constitutional rights by demeaning and
    showing animosity to the defense, among other misconduct;
    limited and chastised the defense during examination of
    witnesses while allowing the prosecution “excessive leeway”;
    belittled counsel and referred to sanctions in front of the jury;
    11
    After the jury returned with a death sentence, the trial
    court set aside all pending sanctions and contempt proceedings
    against defense counsel, except the first, noting that “given the
    jury’s verdict in this case, I think that’s probably enough.”
    99
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    made counsel look bad by reprimanding him in front of the jury;
    and indicated to the jury that defense counsel’s comment about
    access to a prosecution expert was “false and misleading.”
    The defense also moved to disqualify the trial judge under
    Code of Civil Procedure section 170.1, citing the requirement of
    disqualification when “[a] person aware of the facts might
    reasonably entertain a doubt that the judge would be able to be
    impartial.” (Code Civ. Proc., § 170.1(a)(6)(A)(iii).) Citing his
    authority to do so under Code of Civil Procedure section 170.1,
    subdivision (c), the trial judge ordered the trial to continue
    notwithstanding the motion.
    The trial judge made it clear outside the jury’s presence
    that he disapproved of defense counsel’s conduct. He believed
    counsel was dishonest, refused to “play by the rules,” and was
    trying to inject error into the case. Late in the trial, the judge
    noted: “[I]f there was ever a case in my experience that stood for
    a proposition that appellate courts have to give great deference
    to the trial court’s ruling, this is the case, because if you read
    the sterile record in this case, you don’t get the flavor of what
    [counsel] is trying to do.”
    b. Analysis
    The People acknowledge that “there was indeed an
    argumentative, contentious atmosphere during the trial
    between [counsel] and the trial judge” but contend that because
    the court was responding to defense counsel’s “relentless
    gamesmanship” and efforts to inject error into the trial, the trial
    judge cannot be viewed as having committed misconduct.12
    12
    The People do not assert forfeiture of misconduct claims
    premised on the trial court’s allegedly disparaging treatment of
    100
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Although the People focus at some length on defense counsel’s
    conduct, our cases have never suggested that a trial court is
    relieved of its obligation to remain temperate and impartial
    when confronted with a lawyer’s provocative or improper
    behavior.
    A trial court’s “frustration and irritation at counsel’s
    repeated efforts” to violate evidentiary rules can be viewed as
    “ ‘friction between court and counsel, [that] while not desirable,
    [is] virtually inevitable in a long trial.’ [Citation.]” (People v.
    Blacksher (2011) 
    52 Cal.4th 769
    , 825.) Furthermore, “isolated
    comments in a lengthy trial in which the court exhibited some
    impatience with counsel’s argumentative comments and
    questions do not demonstrate misconduct or bias.” (People v.
    Woodruff, supra, 5 Cal.5th at p. 772; see also People v. Geier
    (2007) 
    41 Cal. 4th 555
    , 614 [“four fleeting remarks” during
    lengthy trial did not constitute judicial misconduct]; People v.
    Bell (2007) 
    40 Cal.4th 582
    , 605 [“momentary and isolated
    expression of irritation” did not indicate bias]; People v. Snow
    (2003) 
    30 Cal.4th 43
    , 79 [“occasional impatience” with defense
    questions did not convey bias].)
    We do not fault the trial judge here for the brief
    admonitions he gave to enforce court rules and procedures. And
    defense counsel. Although defense counsel did not object to each
    instance of claimed misconduct, or objected only generally, the
    discord between the trial judge and defense counsel, and the
    number of admonitions and remarks at issue, would have made
    it “unfair to require defense counsel to choose between
    repeatedly provoking the trial judge . . . or, alternatively, giving
    up his client’s ability to argue misconduct on appeal.” (Sturm,
    supra, 37 Cal.4th at p. 1237.) On this record, we conclude the
    claim is preserved.
    101
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    some of the court’s expressions of impatience and frustration
    with defense counsel might be excused as inevitable given the
    demands of controlling what the trial judge viewed as an
    exceptionally unprofessional performance. There are numerous
    instances, however, in which the trial judge disparaged counsel
    in a manner we cannot condone.
    The trial court directed stern remarks and periodic
    sarcasm toward defense counsel that impugned counsel’s
    competence and “inevitably conveyed to the jury the message
    that the trial court thought that defense counsel was wasting
    the court’s — and the jury’s — time by asking inappropriate
    questions.” (Sturm, 
    supra,
     37 Cal.4th at p. 1242.) Indeed, the
    court commented on counsel wasting “valuable court time,”
    referred to counsel asking “ridiculous” and “nonsensical”
    questions, admonished counsel to move onto “meaningful”
    matters, urged counsel to ask “proper” questions to save time,
    and commented about counsel inconveniencing the jury.
    This was not a case in which the trial court also expressed
    sarcasm, impatience, and annoyance toward the prosecution,
    which might have “indicat[ed] its comments were a matter of
    personal style, not the result of a belief that any of the attorneys
    was incompetent or that the defense case lacked merit.” (People
    v. Abel (2012) 
    53 Cal.4th 891
    , 914; see also People v. Bell, supra,
    
    40 Cal.4th 582
    , 605 [court made remarks critical of defense
    counsel but also expressed annoyance at prosecutor]; People v.
    Snow, 
    supra,
     30 Cal.4th at p. 79 [noting the trial judge
    “frequently addressed the prosecutors in an equally brusque
    manner”].) Instead, the trial court spared the prosecution such
    treatment while “repeatedly and improperly disparaging
    defense counsel, which conveyed to the jury the message that
    102
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the court was allied with the prosecution.” (Sturm, 
    supra,
     37
    Cal.4th at p. 1240.)
    A trial court may not “impl[y] to the jury that defense
    counsel was deliberately asking improper questions in order to
    place inadmissible evidence in front of the jury.” (Sturm, 
    supra,
    37 Cal.4th at p. 1240.) “ ‘It is completely improper for a judge to
    advise the jury of negative personal views concerning the
    competence, honesty, or ethics of the attorneys in a trial . . . .’
    [Citation.] This principle holds true in instances involving a
    trial judge’s negative reaction to a particular question asked by
    defense counsel, regardless of whether the judge’s ruling on the
    prosecutor’s objection was correct; even if an evidentiary ruling
    is correct, ‘that would not justify reprimanding defense counsel
    before the jury.’ ” (Ibid.)
    Here, the trial judge not only reprimanded counsel for
    posing improper questions, but, by referencing proceedings
    outside the jury’s presence in which the court had ruled against
    the defense, implied that counsel deliberately attempted to skirt
    the court’s rulings. When the trial judge chastised counsel for
    speaking objections and other extraneous comments, he
    highlighted the repeated warnings and admonitions counsel had
    violated, again conveying to the jury that counsel was flouting
    court rules to inject impermissible matters into the trial. By
    voicing concerns about counsel’s discovery compliance and
    blaming counsel’s lawful disclosures for a delay in the
    proceedings, the trial judge contributed to the impression that
    he doubted counsel’s honesty and found his conduct improper.
    The trial judge also commented concerning defense
    counsel misstating the law during his penalty phase closing
    argument and admonished the jury to disregard counsel’s
    103
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    statement that aspects of defendant’s background could be
    considered mitigating. Focusing on counsel’s reference to
    multiple “factors” to consider under section 190.3, factor (k),
    instead of using the word “circumstances,” the trial court
    informed the jury that counsel had been “wrong” to suggest that
    each piece of evidence was a separate factor to consider.
    Particularly when the jury was instructed with CALJIC
    No. 8.88, which used “factor” and “circumstance” synonymously
    in the course of addressing the consideration of aggravating and
    mitigating evidence, the trial judge’s comments needlessly
    suggested additional wrongdoing by defense counsel and
    implied that the defense was trying to improperly inflate the
    case in mitigation.
    On a few occasions, the trial court directly accused counsel
    of trying to place inaccurate or inadmissible evidence before the
    jury, telling counsel, “That is improper, and you know it,”
    referring to another of counsel’s representations as “false and
    misleading,” and remarking that counsel did not want to provide
    the jury with an accurate version of evidence. In his remarks in
    the presence of the jury, the trial judge informed counsel that he
    would be sanctioned and cited him for misconduct and contempt.
    “Jurors rely with great confidence on the fairness of
    judges, and upon the correctness of their views expressed during
    trials. For this reason . . . a judge should be careful not to throw
    the weight of his judicial position into a case, either for or
    against the defendant.” (People v. Mahoney (1927) 
    201 Cal. 618
    ,
    626–627 (Mahoney).)       With his disparaging commentary
    regarding counsel’s performance, and “by accusing counsel of
    unethical and unlawful conduct in front of the jury, the court
    overstepped the bounds of propriety.” (People v. Banks, supra,
    59 Cal.4th at p. 1203.) These were not “relatively brief and
    104
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    mild” references (People v. Melton (1988) 
    44 Cal.3d 713
    , 754) or
    showings of “occasional impatience” (People v. Snow, 
    supra,
    30 Cal.4th at p. 79), but persistent, discourteous, and improper
    remarks that amounted to misconduct (Sturm, 
    supra,
     37 Cal.4th
    at p. 1233).
    Although we conclude that the trial court engaged in
    misconduct, we do not agree with all of defendant’s contentions
    regarding the court’s assertedly improper treatment of defense
    counsel. As explained below, we reject some of defendant’s
    claims in this regard.
    Defendant contends the trial judge violated her federal
    constitutional rights by unfairly curtailing defense questioning.
    Defendant points to no state law error in the examples she cites
    (People v. Linton (2013) 
    56 Cal.4th 1146
    , 1202; People v. Abilez
    (2007) 
    41 Cal.4th 472
    , 503), and “ ‘ “[a] trial court’s numerous
    rulings against a party — even when erroneous — do not
    establish a charge of judicial bias, especially when they are
    subject to review” ’ ” (People v. Buenrostro (2018) 
    6 Cal.5th 367
    ,
    405). Defendant also asserts that the trial judge admonished
    the defense more frequently than the prosecution to “move on.”
    than it did to the prosecution. “[A] numerical disparity between
    sua sponte interventions . . . does not on its own constitute
    misconduct.” (Sturm, 
    supra,
     37 Cal.4th at pp. 1241–1242.) The
    remarks, which the trial judge also made to the prosecution,
    were within the court’s discretion in controlling the conduct of
    the trial. (People v. Snow, 
    supra,
     30 Cal.4th at p. 79.)
    We also reject defendant’s argument that the trial judge
    showed bias by assertedly treating the defense and prosecution
    unequally in witness scheduling, discovery compliance, and
    expert funding. The trial judge played no role in defense expert
    105
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    funding (Pen. Code, § 987.9, subd. (a)), and his other rulings are
    not sufficient to establish judicial bias, particularly when they
    are subject to review (People v. Buenrostro, supra, 6 Cal.5th at
    p. 405). We have separately addressed defendant’s claims
    regarding discovery, and defendant does not assert error in the
    court’s rulings regarding witness scheduling.
    Defendant argues the trial court exhibited bias by having
    ex parte communications with the prosecution about disclosure
    obligations regarding impeachment evidence and brief
    exchanges concerning the order of witnesses, the status of sealed
    material, and prosecution expert funding.         In People v.
    Thompson (2016) 
    1 Cal.5th 1043
    , noting that section 1054.7
    “contains no express prohibition on ex parte hearings,” we
    concluded there was no violation of state law when the trial
    court held an ex parte hearing to address discovery obligations,
    as the court did here. (Id. at p. 1099.) Although defendant
    contends the trial judge improperly advised the prosecution on
    discovery obligations, “[t]he judge’s fleeting comment was at
    most a suggestion, rather than the rendition of advice.”
    (Mendoza, 
    supra,
     24 Cal.4th at p. 197.) The ex parte discussion
    of impeachment evidence related to a defense expert who never
    testified, and other issues briefly addressed were not improper.
    (Ibid.)
    2. Treatment of witnesses
    Defendant contends the trial judge engaged in misconduct
    and violated her federal constitutional rights when: he
    assertedly disparaged defense experts Drs. Humphrey, Ney,
    Plotkin, and Suiter, and lay witness Carl Hall; “glamorized” a
    prosecution expert; and humiliated defendant when she was on
    the stand. We agree that some of the trial judge’s remarks and
    106
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    questions were improper — those regarding Drs. Plotkin and
    Ney, Carl Hall, and the prosecution expert — and reject
    defendant’s other claims.
    a. Background
    i. Dr. Plotkin
    Dr. Plotkin testified for the defense that a diet drug and
    antidepressant interaction could have provoked a seizure that
    impaired defendant’s volitional functioning at the time of the
    fire. On cross-examination, Dr. Plotkin explained that he
    conducted a search of medical literature, a “PubMed” search,
    and found a number of articles indicating, contrary to testimony
    by a prosecution expert, that the diet drug and antidepressant
    interaction could cause “serotonin syndrome,” which in turn
    could result in seizures. Echoing the prosecutor, the trial court
    stated, “[a] lot of these PubMeds deal with rats and monkeys
    and other animals other than humans, correct?”
    When Dr. Plotkin explained that a “volume of literature”
    documented the drug interaction resulting in serotonin
    syndrome, the trial court interrupted and the following
    exchange occurred:
    “The court: Wait, Wait. Please. [¶] When you say that
    you found volumes of articles, do you mean to say that you found
    volumes of abstracts of articles?
    “The witness: That’s correct.
    “The court: And you haven’t read any of the articles
    themselves; is that correct?
    “The witness: Right. All from the same search. . . .
    107
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    “The court: Didn’t you see when you were online on the
    internet that you can simply log on and order the document by
    e-mail[?]
    “The witness: Well, I did this Saturday.
    “The court: Didn’t you see that when you were online that
    all [sic] do you have do is log on and become a user and you can
    order the articles online? [¶] Did you see that?
    “The witness: I don’t think you can log on on a Saturday
    to become a user. But it didn’t phase [sic] me to do that. I had
    enough data, I felt, to make that opinion. . . . The [prosecution]
    expert testified that he based his opinion on a PubMed search
    and not reading articles which explained it. . . .
    “The court: But he is a board certified toxicologist, correct?
    “The witness: This is about serotonin syndrome. . . . He’s
    not an expert in that.”
    In further cross-examination, the prosecutor asked Dr.
    Plotkin to confirm that it was a “medical certainty” that
    defendant did not have serotonin syndrome, noting that a Dr.
    Ordog had examined her at the time of the fire and ruled out the
    syndrome. Dr. Plotkin observed that the only evidence about
    Dr. Ordog’s opinion was that two years after the fire a
    prosecution expert, Dr. Phillips, testified that he spoke to Dr.
    Ordog, who claimed to have ruled out serotonin syndrome. The
    trial court then intervened:
    “The court: Well, why would you assume that Dr. Ordog is
    making something up two years later?
    “The witness: Your Honor, that’s absolutely not what I
    said.
    “The court: Well, what are you saying?
    108
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    “The witness: I am saying that in my reading of Dr.
    Ordog’s notes, at the time it was not considered in the
    differential. [¶] So how can I say that he ruled it out at the
    time?
    “The court: But how do you know that Dr. Ordog doesn’t
    have an independent recollection of what happened that may
    not be reflected in [his] notes?
    “The witness: As I said before, I believe that Dr. Phillips
    in good faith represented his conversation with Dr. Ordog, who
    said two years later that he ruled it out. . . . But I am saying
    here that I — that how can you say that a hundred percent, if I
    am a third party in this?”
    The prosecutor later asked Dr. Plotkin a series of
    questions about his failure to personally interview defendant,
    despite his ethical obligations to strive to do so. When Dr.
    Plotkin explained that it would have been best to interview
    defendant but he did not have enough time, the trial court
    asked, “Then why did you accept the appointment?” Dr. Plotkin
    stated that in retrospect he should not have taken the
    appointment, in part because “the defense experts have been
    suggested as liars to begin with, and had I known that, I
    wouldn’t have taken on the personal insults the way I have.”
    On redirect, Dr. Plotkin testified that after a seizure a
    person would experience a state of delirium; he believed the
    defense expert Dr. Ney misspoke when he referred to the effect
    of a seizure as “dissociation.” The trial court then interrupted,
    and the following exchange occurred:
    “The court: When you say you believed he misspoke, you
    never talked to him, did you?
    “The witness: No. From reading his testimony.
    109
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    “The court: For all you know, he said exactly what he
    meant to say and he just doesn’t know what he’s talking about.
    [¶] You don’t know that, do you?
    “The witness: That’s correct. . . .
    “The court: So why don’t you confine your answers to that,
    and don’t assume what is in Dr. Ney’s mind if you’re [sic] never
    talked to the man.”
    The trial court also reprimanded Dr. Plotkin outside the
    presence of the jury; after Dr. Plotkin remarked that he had not
    been allowed to explain his answers, the trial court threatened
    to have him removed from the county panel of approved experts.
    ii. Dr. Ney
    During cross-examination, the prosecutor attempted to
    impeach Dr. Ney by referencing his prior testimony that he had
    not previously qualified as an expert on relevant topics. In
    response to repeated defense objections to the questioning, the
    trial court advised the prosecutor to “just ask a direct question,
    and if it’s inconsistent then you can impeach him with the
    transcript.” After Dr. Ney gave equivocal answers to questions
    about his qualifications, the trial court allowed the prosecutor
    to read the prior testimony in which Dr. Ney acknowledged that
    he had never qualified to testify as an expert concerning
    epilepsy, neurology, or carbon monoxide poisoning.
    Dr. Ney gave evasive responses to many other prosecution
    questions and denied or claimed not to remember making
    statements in his report and prior testimony. Prosecutors
    accused Dr. Ney of making inappropriate faces and gestures
    while testifying, and the trial court admonished him to stop
    mumbling to himself on the stand. Dr. Ney’s testimony about a
    variety of unusual conditions was disjointed, with many
    110
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    nonresponsive tangents, and appeared to suggest inconsistent
    theories concerning defendant’s behavior. Some of his claims
    strained credulity: he testified that some dissociation could go
    on for months, during which time a person could unknowingly
    travel or take a job; he also maintained that abortion interfered
    with a mother’s instinct to protect her offspring and made her
    more likely to kill her other children.
    During a hearing on discovery matters held outside the
    presence of the jury, the trial court asked Dr. Ney questions
    regarding his affiliation with “pro-life” organizations and later
    marked as a People’s exhibit three items from the internet that
    referenced Dr. Ney’s work, which the court found when
    researching Dr. Ney’s background. In another hearing outside
    the jury’s presence, the trial court threatened to have Dr. Ney
    arrested after learning of suggestions that he might not return
    to court to testify as ordered.
    iii. Dr. Humphrey
    Dr. Humphrey testified on cross-examination that she
    used nonstandard normative data for one of the tests she
    administered; she explained that the unpublished data was new
    and that she had obtained it from the test authors. During her
    testimony, the trial judge admonished Dr. Humphrey three
    times to refrain from interrupting the prosecutor’s questions
    before he sent the jury out and informed her that he would
    impose sanctions against her if she did not stop interrupting.
    At a hearing regarding her normative data held outside
    the jury’s presence, Dr. Humphrey acknowledged that the data
    was not new, as she had testified. She nonetheless defended her
    reliance on the data, claiming that one of the test authors, Dr.
    Satz, had recommended it to her.             When the prosecutor’s
    111
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    questioning suggested that Dr. Humphrey might be
    contradicting Dr. Satz’s version of events, the trial court
    warned, “If you’re not sure, you can say that. But if you
    specifically deny that and it’s not true, you have a problem.” The
    trial court ordered Dr. Humphrey to leave the courtroom before
    a prosecution expert testified that Dr. Satz had denied making
    any suggestion to Dr. Humphrey regarding the use of
    unpublished data.
    At the conclusion of the hearing, the trial court asserted
    that Dr. Humphrey was “an out-and-out liar” and stated that he
    found her explanations “inherently unbelievable.” The court
    concluded it was “clear” that Dr. Humphrey had committed
    perjury and if she testified further the prosecution might want
    to have someone from Attorney General’s office present to avoid
    a conflict in prosecuting her. The court added that if Dr.
    Humphrey returned to testify, “[m]aybe someone wants to
    advise her of her right to have an attorney present. I am not
    going to do that, because I don’t want to interfere with the
    defense and dissuade a witness, and that’s one of the reasons I
    asked her to step outside.”
    On rebuttal, the prosecution expert highlighted a number
    of mistakes in Dr. Humphrey’s report and recounted
    information from the hearing that had occurred outside the
    jury’s presence, explaining that the data Dr. Humphrey
    characterized as new was in fact outdated and that Dr. Satz and
    another test author had refuted Dr. Humphrey’s claim that they
    had advised her to use nonstandard normative data. Although
    the defense had planned to reopen Dr. Humphrey’s testimony,
    she did not return to testify for any portion of the trial.
    112
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    At the penalty phase, the defense made an offer of proof
    regarding testimony by a new neuropsychologist, Dr. Boone,
    arguing that Dr. Boone was needed to rehabilitate Dr.
    Humphrey’s psychological testing because the prosecution had
    so undermined her competence and integrity before the jury.
    The defense also represented that the circumstances of Dr.
    Humphrey “being called a liar and a perjurer, and the distress
    she was in over all of that” prevented the defense from relying
    on her further as a witness.
    iv. Defendant’s testimony
    On cross-examination, defendant testified that she did not
    remember seeing her deceased daughters on the kitchen floor
    and thought they were asleep. She remembered going into the
    backyard after the fire, which she would have accessed by going
    through a sliding door near the kitchen. The prosecution
    attempted to challenge defendant’s testimony by showing her
    photographs of the victims that reflected how she would have
    had to step over their bodies to go through the sliding door.
    Defendant testified that she did not remember stepping over her
    children. When she would not turn to look at the display of
    photographs, the trial court ordered, “Put it in front of her then.”
    After defense counsel objected to the placement of the
    photographs, the court responded, “All right. Put it back on the
    board. [¶] Miss Nieves, you’re ordered to turn around and look
    at the photographs.” When defendant again refused, stating, “I
    am not looking at my children if they’re dead,” the court
    reiterated, “I am ordering you to turn around and look at the
    photos.” When defendant would not comply, the court sent the
    jury out and ordered defendant to look at the photographs and
    be questioned regarding them or be found in contempt of court.
    113
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The court denied counsel’s request to allow defendant a moment
    to compose herself before bringing the jury back in.
    When cross-examination resumed, defense counsel
    objected to the form of the prosecutor’s cross-examination and
    her continued reference to photographs of the victims. The court
    overruled the objections and denied counsel’s request for a
    recess due to defendant being distraught. The prosecutor then
    ended her examination and the jury was excused.
    v. Dr. Suiter
    Dr. Suiter was the court-appointed expert in defendant’s
    divorce and custody proceedings. During the penalty phase, he
    testified about evaluating defendant and her family and the
    bases for his recommendation in 1997, approximately a year
    before the crime, that she receive custody of her children.
    On cross-examination, the prosecution tried to impeach
    facts that defendant provided to Dr. Suiter during his
    evaluation, such as her high school grades. The trial court
    sustained an objection to the relevance of one such question and
    interposed its own objection to another, stating: “How would he
    know that? There is no foundation.” After sustaining another
    objection to similar questioning, the court stated, “He’s here to
    talk about what happened in 1997,” and to Dr. Suiter added,
    “[Y]ou don’t have a crystal ball, do you?”
    The trial judge then questioned Dr. Suiter himself,
    reminding Dr. Suiter of defendant’s conviction for killing four of
    her children and asking: “[Y]ou would probably want to change
    your opinion made back in 1997, wouldn’t you, if you could do
    it?” The trial judge appeared surprised when Dr. Suiter said he
    would not change his opinion, responding, “You wouldn’t?” Dr.
    Suiter explained that he stood by his recommendation, which
    114
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    was based on the data available to him at the time. The trial
    judge then instructed the prosecutor to “get on to something
    else.”
    When the prosecutor continued to ask whether
    defendant’s high school record might cause Dr. Suiter to change
    his 1997 opinion, the trial court sent the jury out and
    admonished the prosecutor to stop the line of questioning:
    “I asked him the most extreme question and it doesn’t change
    his opinion. So anything subsidiary to that, that’s argument.”
    The trial court added, “[T]he point is . . . this jury is getting tired
    of hearing evidence. Let’s just get on with it. A lot of this
    examination is unnecessary.”
    In response to a subsequent prosecution question
    concerning whether he was afraid of being sued for his custody
    recommendation, Dr. Suiter responded: “No. . . . I had no
    crystal ball. . . . I mean, of course anybody in retrospect, I would
    think, would not have the children present with the mother at
    all . . . given what happened. [¶] But again, as I stated earlier,
    given the data that I had at the particular time, I am confident
    of my recommendation. [¶] There was not even any appreciable
    complaint about the mother on the part of Mr. Folden.”
    The prosecution, which had aggressively sought to prevent
    the introduction of Folden’s statements about defendant’s
    parenting, quickly moved to strike Dr. Suiter’s final comment as
    nonresponsive. The trial court responded to the prosecutor, “Yes
    it is, [counsel]. It is overruled.” Noting Dr. Suiter’s confusion at
    the interruption, the court assured him, “You didn’t do anything
    wrong. [¶] Have you finished your answer?” The court then
    allowed Dr. Suiter to further explain:           “There were no
    allegations made to me by Mr. Folden that the children were at
    115
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    any risk [from] being with their mother in terms of being
    physically harmed. Those were not the elements of the
    evaluation as, quite frankly, is often the case.”
    vi. Carl Hall
    During Hall’s penalty phase testimony about his
    friendship with defendant, the trial court struck several of his
    answers as nonresponsive or irrelevant and admonished Hall
    not to expound on his answers: “I think you’ve answered the
    question”; “If the answer calls for yes or no, just try to answer it
    that way, okay?”; and finally, “Look, just answer the question.
    Don’t add all the other information, okay?” After Hall again
    began a nonresponsive answer, the trial court sent the jury out
    and told Hall, “If you answer another question like you just did
    . . . and try to get before this jury improper evidence that I’ve
    already ruled upon, I will hold you in contempt of court, put you
    in jail for five days, fine you up to $1,000 or impose monetary
    sanctions of up to $1,500. . . . Do you understand that?”
    When the jurors returned, the trial court informed them,
    “The last statement of the witness was stricken, and I have
    admonished the witness not to get anything else before the jury
    that is not responsive to the question.” When Hall resumed
    testifying, he began to answer a question while an objection was
    pending. Defense counsel advised Hall, “You have to wait,” and
    the trial court added, “Do you understand when there’s an
    objection, you’re not supposed to answer the question? [¶] Do
    you understand that?” When Hall answered, “Okay,” the trial
    court continued: “Then why did you just make that response
    when there was an objection raised? [¶] Why did you just make
    that response when there was objection? [¶] You don’t know do
    you?” Hall stated that he was very nervous.
    116
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    During cross-examination, Hall testified that defendant
    would not have killed her children if she were in her right mind.
    The prosecutor twice asked who suggested defendant was not in
    her right mind without receiving a direct answer, after which
    the trial court interjected, “Why don’t you just answer the
    question. [¶] Who told you that?” When Hall replied, “Nobody
    told me,” the trial court remarked, “[T]hen why didn’t you just
    answer the question that way?”
    vii. Prosecution expert
    John Dehaan testified as a fire reconstruction expert for
    the prosecution. During that testimony, Juror No. 7 relayed to
    the bailiff that he recognized Dehaan from a television program,
    possibly on the Discovery Channel, but that it would not
    influence how he viewed Dehaan’s testimony. The bailiff wrote
    a note to the court conveying this information.
    At the conclusion of Dehaan’s testimony, in the presence
    of the jurors, the trial court asked Dehaan whether he had
    appeared on the Discovery Channel.             Dehaan replied
    affirmatively, adding he had also appeared on the Fox Family
    Channel. The court then excused all jurors save Juror No. 7 and
    elicited the juror’s assurances that he would not be influenced
    by recognizing Dehaan on television. Defense counsel objected
    to the court questioning Dehaan, argued it suggested a pro-
    prosecution bias, and moved for a new trial, which the trial court
    denied without comment.
    The prosecution later advised the court that Dehaan was
    scheduled to appear on the Fox Channel the following day. At
    the end of the day, the court told jurors, “[T]here’s going to be a
    program [on television] that involves one of the witnesses who
    has testified in this case.” The court ordered jurors not to watch
    117
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the Fox Channel at 9:00 p.m. the next day, or to otherwise “get
    information from anybody else that may have looked at it. Just
    avoid it at all costs.”
    b. Analysis
    We reiterate that judicial questioning and comment
    during witness testimony should be “temperate rather than
    argumentative.” (People v. Cook (1983) 
    33 Cal.3d 400
    , 408.)
    “A trial court has both the discretion and the duty to ask
    questions of witnesses, provided this is done in an effort to elicit
    material facts or to clarify confusing or unclear testimony.
    [Citations.] The court may not, however, assume the role of
    either the prosecution or of the defense” and “it must not convey
    to the jury the court’s opinion of the witness’s credibility.”
    (People v. Cook (2006) 
    39 Cal.4th 566
    , 597; see also Sturm,
    
    supra,
     37 Cal.4th at p. 1238.)
    Defendant asserts the trial court’s questioning
    undermined Dr. Plotkin’s testimony and improperly assisted the
    prosecution. The People contend defendant forfeited this claim
    by failing to object at trial. By the time Dr. Plotkin testified,
    however, the trial court had denied six defense motions for
    mistrial based on the court’s asserted bias against the defense,
    and it was proceeding with trial while the defense motion to
    disqualify the court was pending. In this context, we agree with
    defendant that additional objections likely would have been
    futile. (Sturm, 
    supra,
     37 Cal.4th at p. 1237.)
    The trial court’s initial question to Dr. Plotkin about his
    PubMed searches underscored the prosecutor’s point that
    research articles supporting the defense were not based on
    human studies, a point of clarification within the court’s
    discretion to elicit. It was strikingly inappropriate, however, for
    118
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the court to disparage Dr. Plotkin’s review of online literature
    with repeated, argumentative questions about the ease with
    which he could have downloaded articles (Sturm, 
    supra,
    37 Cal.4th at pp. 1238–1239), and to do so by making personal
    observations about access to articles on the PubMed website —
    facts that had not been presented to the jury (People v. Abel,
    
    supra,
     53 Cal.4th at p. 917 [trial court erred by using personal
    knowledge to comment on testimony]; People v. Gonzales and
    Soliz (2011) 
    52 Cal.4th 254
    , 323 [same]). In response to Dr.
    Plotkin’s observation that the prosecution expert had also relied
    on abstracts of research, the trial court’s comment, “[b]ut he is a
    board certified toxicologist,” implied the court’s belief that the
    prosecution expert had greater expertise than Dr. Plotkin and
    contributed to the impression that the court discounted Dr.
    Plotkin’s testimony.
    The trial court’s questions posed to Dr. Plotkin about Dr.
    Ordog, rather than merely clarifying testimony, reprimanded
    Dr. Plotkin for questioning the prosecution evidence. When Dr.
    Plotkin cited a lack of contemporaneous documentation for Dr.
    Ordog’s conclusions, the court’s response — “how do you know
    that Dr. Ordog doesn’t have an independent recollection of what
    happened that may not be reflected in [his] notes?” — was
    accusatory, disparaging, and a pointed defense of the
    prosecution’s evidence. By contrast, the trial court’s remarks
    about Dr. Ney — “[f]or all you know, he said exactly what he
    meant to say and he just doesn’t know what he’s talking about”
    — were highly improper, both harsh and demeaning to Dr.
    Plotkin and blatantly contemptuous of Dr. Ney. If there were
    any question about the tenor of the trial court’s remarks, Dr.
    Plotkin’s unchallenged comment that defense experts had been
    119
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    made out to be liars provided further indication of their hostile
    and disparaging impact.
    The trial court also improperly chastised and demeaned
    penalty phase witness Carl Hall. The People claim that Hall
    was a “recalcitrant witness” whose behavior the trial court
    properly attempted to control. It is not clear why the court
    believed Hall attempted to flout a prior ruling limiting his
    testimony, but it was improper for the court to tell the jury that
    it had admonished Hall “not to get anything else before the jury
    that is not responsive to the question.” (See Sturm, 
    supra,
    37 Cal.4th at p. 1239.) It is also not apparent whether Hall
    understood he should refrain from testifying while an objection
    was pending, but we see no reason for the trial court to berate
    him for it in front of the jury. “The court’s questioning must be
    ‘ “temperate, nonargumentative, and scrupulously fair” ’
    [citation], and it must not convey to the jury the court’s opinion
    of the witness’s credibility.” (People v. Cook, 
    supra,
     39 Cal.4th
    at p. 597.) The trial court’s failure to maintain such composure
    when addressing Hall was improper.
    Defendant contends the trial court improperly
    “glamorized” prosecution expert John Dehaan, demonstrating a
    pro-prosecution bias.   The trial court was addressing a
    circumstance in which a juror had been exposed to extraneous
    facts about Dehaan’s credentials that may have added to his
    credibility. (Cf. In re Richards (2016) 
    63 Cal.4th 291
    , 313.) Our
    cases establish that a “juror’s ‘receipt of information about a
    party or the case that was not part of the evidence received at
    trial,’ ” even if “passive or involuntary,” constitutes juror
    misconduct. (People v. Cowan (2010) 
    50 Cal.4th 401
    , 507.)
    Rather than simply dispel any potential prejudice from the
    juror’s inadvertent exposure (People v. Linton, supra, 
    56 Cal.4th 120
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    at p. 1213), the trial court elicited and highlighted Dehaan’s
    television appearances for the entire jury, a matter unnecessary
    to the clarity or completeness of his testimony. In this context,
    the trial court’s questioning of Dehaan was improper, “even if no
    impropriety was intended.” (People v. Geier, 
    supra,
     41 Cal.4th
    at p. 614.)
    Defendant advances additional claims about the trial
    court’s allegedly improper treatment of defense witnesses. We
    find no merit in defendant’s remaining contentions.
    Defendant argues that the court’s treatment of the defense
    neuropsychologist, Dr. Humphrey — particularly, the
    suggestion the court made outside the presence of the jury, that
    she committed perjury — prevented her from returning to
    testify and thus violated defendant’s right to present a defense.
    “The government violates a defendant’s constitutional right to
    compulsory process when it interferes with the exercise of a
    defendant’s right to present witnesses on [her] own behalf.”
    (People v. Capers (2019) 
    7 Cal.5th 989
    , 1008.) Our cases require
    a defendant to show that interference was “egregious and
    improper” (People v. DePriest (2007) 
    42 Cal.4th 1
    , 55), “was a
    substantial cause of [the] witness’s refusal to testify,” and “ ‘at
    least a reasonable possibility that the witness could have given
    testimony that would have been both material and favorable.’ ”
    (Capers, at p. 1008). Defendant does not meet this burden.
    Defense counsel offered two reasons why he did not bring
    Dr. Humphrey back to testify.          First, the prosecution
    questioning and rebuttal — which showed that she used
    incorrect data, was apparently dishonest about it, and made
    other mistakes and omissions in her report — undermined Dr.
    Humphrey’s credibility to the extent that she could not
    121
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    effectively defend her testing and conclusions before the jury.
    Second, Dr. Humphrey was distressed by the trial court’s
    suggestions that she had lied and committed perjury.
    It is not apparent on this record that the trial court’s
    remarks were “a substantial cause” for Dr. Humphrey’s failure
    to return to testify for the defense. (People v. Capers, supra,
    7 Cal.5th at p. 1008.) Moreover, considering defense counsel’s
    observation that the prosecution successfully impeached Dr.
    Humphrey’s credibility with the jury, defendant has not
    established that the trial court’s remarks “deprived defendant
    of beneficial testimony.” (People v. DePriest, 
    supra,
     42 Cal.4th
    at p. 56.) We thus see no reasonable possibility that further
    testimony by Dr. Humphrey would have been favorable to the
    defense, notwithstanding any impropriety in the trial court’s
    remarks or their possible role in deterring her testimony.
    (People v. Capers, supra, 7 Cal.5th at p. 1008.)
    Defendant asserts the trial court committed misconduct
    when it threatened Dr. Humphrey and other defense witnesses.
    The trial court’s threat of sanctions and comments regarding Dr.
    Humphrey’s veracity took place outside the presence of the jury,
    as did its threats to Dr. Ney, Dr. Plotkin, and Hall. Although
    several of the remarks were excessively punitive, we cannot
    conclude that they amounted to misconduct when the record
    does not demonstrate how they might have influenced the jury
    or otherwise affected the trial.        (People v. Peoples, supra,
    62 Cal.4th at p. 790.)
    For similar reasons, we reject defendant’s claim that the
    trial court’s research into Dr. Ney’s views on abortion was
    misconduct. Each of the cases defendant cites in support of her
    argument addressed a judicial officer injecting extrajudicial
    122
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    evidence into key fact finding, a circumstance not present here.
    Although the trial court marked material it found as People’s
    exhibits, they were not received into evidence and there is no
    indication the court’s research and questioning outside the
    presence of the jurors affected their consideration of Dr. Ney’s
    testimony or other matters in the trial. (People v. Peoples, supra,
    62 Cal.4th at p. 790.)
    Defendant claims the trial court’s comment about
    impeaching Dr. Ney’s testimony suggested to the jury that Dr.
    Ney might lie on the stand. The People argue that defendant
    forfeited the claim by failing to object at trial. Even if the claim
    were preserved, we would conclude that it lacks merit. It was
    not improper for the trial court to make a single remark to
    forestall additional objections by the defense and oblige the
    prosecutor to lay a foundation for impeaching Dr. Ney. (People
    v. Monterroso (2004) 
    34 Cal.4th 743
    , 783; People v. Melton,
    supra, 44 Cal.3d at p. 736.)
    Citing Deck v. Missouri (2005) 
    544 U.S. 622
    , 630, and
    other shackling cases, defendant argues that when the trial
    court ordered her to look at a photo of her deceased children the
    court undermined her dignity and presumed innocence by
    “figuratively pointing” to her guilt in a manner akin to visibly
    shackling her in front of the jury. Defendant does not claim any
    error regarding the prosecutor’s questions and use of
    photographic evidence but argues that it was improper for the
    trial court to order her to respond to them when there were “less
    cruel” ways of eliciting the same information. We do not
    condone the trial court’s harsh tenor in addressing defendant’s
    apparent distress. Once defendant became a witness, however,
    the prosecution could attempt to impeach her credibility by
    confronting her with photographic evidence (cf. People v. Batts
    123
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    (2003) 
    30 Cal.4th 660
    , 693), defendant had a “duty to testify in
    accordance with the rules of evidence,” and it was within the
    trial court’s discretion to enforce that duty (People v. Smith
    (2003) 
    30 Cal.4th 581
    , 624; see also § 166, subd. (a)(6); § 1044).
    Defendant also contends that during cross-examination of
    her penalty phase expert, Dr. Suiter, the trial court intervened
    to assist the prosecution and interfered with defendant’s ability
    to present mitigating evidence.        The People argue that
    defendant forfeited this claim by failing to object to the trial
    court’s question. Assuming the issue was preserved, we find no
    impropriety.
    Although the trial court’s question — whether Dr. Suiter
    would want to change his 1997 opinion in light of the charges
    against defendant — might appear dismissive of the doctor’s
    prior opinion, it is not improper when viewed in context. (People
    v. Boyette (2002) 
    29 Cal.4th 381
    , 460.) “While it is ordinarily the
    better practice for the trial court to let counsel develop the case,
    a trial court properly may ‘undertake the examination of
    witnesses . . . when it appears that relevant and material
    testimony will not be elicited by counsel.’ ” (People v. Guerra,
    
    supra,
     37 Cal.4th at p. 1125.) Here, where the prosecutor
    appeared poised to exhaustively challenge Dr. Suiter’s prior
    opinion with minor details such as defendant’s high school
    grades, the trial court’s effort to reframe the point directly and
    limit argumentative questioning was not improper.             (Ibid.;
    People v. Nguyen (2015) 
    61 Cal.4th 1015
    , 1061.)
    The trial court ultimately limited prosecution efforts to
    impeach Dr. Suiter, allowed him to strengthen the basis for his
    1997 recommendation by referencing the absence of complaints
    about defendant’s parenting, and provided him an opportunity
    124
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    to reiterate the court’s point that he did not have a “crystal ball”
    and to acknowledge the obvious, that he would not have made
    the same recommendations if he had known defendant would
    kill her children. In all, the result underscored Dr. Suiter’s
    professionalism and bolstered his testimony that defendant
    appeared to be a suitable caretaker before the fire.
    3. Structural error
    Defendant contends the trial judge’s conduct reflected bias
    and constitutes structural error. 13 “ ‘A criminal defendant has
    due process rights under both the state and federal
    Constitutions to be tried by an impartial judge.’ ” (People v.
    Peoples, supra, 62 Cal.4th at p. 788.) Establishing a violation of
    this right requires “an objective assessment of the
    circumstances in the particular case” and “ ‘ “the probability of
    actual bias on the part of the judge or decisionmaker [that] is
    too high to be constitutionally tolerable.” ’ ” (Freeman, supra, 47
    Cal.4th at p. 996; Rippo v. Baker (2017) ___ U.S.___ [
    137 S.Ct. 905
    , 907]; Peoples, at p. 788.) “[I]t is the exceptional case
    presenting extreme facts where a due process violation will be
    found.” (Freeman, at p. 1005.)
    13
    In addition to asserting violation of her constitutional
    rights, defendant references her statutory right under Code of
    Civil Procedure section 170.1.         This statutory right to
    impartiality is raised through a motion to disqualify an
    assertedly biased judge (Code Civ. Proc., § 170.6), the resolution
    of which is reviewable only by writ of mandate (Code Civ. Proc.,
    § 170.3, subd. (d)). (People v. Peoples, supra, 62 Cal.4th at
    p. 786; People v. Freeman (2010) 
    47 Cal.4th 993
    , 999–1000.)
    (Freeman).) Because section 170.3, subdivision (d) provides the
    exclusive procedure for resolving statutory claims, we address
    only defendant’s constitutional due process contention.
    (Peoples, at p. 787.)
    125
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The “controlling principle” of unconstitutional bias rests
    on a “general concept of interests” that may prevent
    adjudicators from remaining “ ‘disinterested in the conviction or
    acquittal of those accused.’ ” (Caperton v. A. T. Massey Coal Co.
    (2009) 
    556 U.S. 868
    , 878, 880; see also Freeman, 
    supra,
     47
    Cal.4th at p. 1005.) Though traditionally focused on pecuniary
    influences (Freeman, at pp. 1001–1002), the high court has
    explained that there may be a disqualifying interest in the
    outcome of criminal proceedings that “rests on the relationship
    between the judge and the defendant.” (Caperton, at p. 881.) A
    judge would be unlikely to remain neutral, for example, when
    presiding over criminal contempt proceedings involving a
    defendant with whom the judge had a “ ‘running, bitter
    controversy.’ ” (Ibid.) Appellate opinions we cited in Freeman
    provide additional examples of bias that reflect a judge’s
    relationship to the parties before it (Freeman, at p. 1006, fn. 4):
    in those cases, trial judges made inappropriate comments about
    women, in cases decided against women (Catchpole v. Brannon
    (1995) 
    36 Cal.App.4th 237
    ; In re Marriage of Iverson (1992) 
    11 Cal.App.4th 1495
    ), about lawyers, when the defendant was an
    attorney (Hall v. Harker (1999) 
    69 Cal.App.4th 836
    , 840–841),
    and about noncitizens, when one party was a foreign national
    (Hernandez v. Paicius (2003) 
    109 Cal.App.4th 452
    , 460–461).
    We therefore consider whether the trial judge’s
    inappropriate comments reflect a constitutionally intolerable
    possibility that he harbored an interest in the outcome of
    defendant’s trial. We conclude that they do not. The judge did
    not express bias toward defendant or a group to which she
    belonged, as in the appellate cases just cited. Nor has there been
    a showing of past controversy between the judge and defendant,
    pecuniary interests, or other “influence at issue.” (Caperton,
    126
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    supra, 556 U.S. at p. 884.) Ultimately, the judge’s comments
    disparaging the performance of defense counsel and witnesses,
    though highly inappropriate, did not convey an interest in
    defendant’s conviction or sentence; the misconduct thus falls
    short of the “extreme facts” that would raise an objective
    likelihood that the trial judge here was actually biased against
    the defendant. (Freeman, supra, 47 Cal.4th at p. 1005.)
    Accordingly, we find no structural error, and will assess the
    court’s misconduct for prejudice. (People v. Abel, 
    supra,
    53 Cal.4th at p. 914; Sturm, 
    supra,
     37 Cal.4th at p. 1243.)
    4. Prejudice
    We consider the cumulative effect of the trial judge’s
    misconduct in order to assess prejudice that may arise from a
    variety of factors. (Sturm, 
    supra,
     37 Cal.4th at p. 1243.) We
    have observed that the timing of a judge’s improper remarks
    may increase their potential for prejudice, such as comments
    made during counsel’s closing argument (People v. Abel, 
    supra,
    53 Cal.4th at p. 916) and comments that interfere with the
    defense presentation of evidence (Sturm, at p. 1241). The
    frequency of improper comments is another consideration. In
    Sturm, where the trial court interjected in the defense
    presentation of mitigation more than 30 times and made
    additional remarks that disparaged defense counsel and
    witnesses (ibid.), we concluded that the “numerous instances of
    misconduct created an atmosphere of unfairness” that
    contributed to prejudice (id. at p. 1243). We found the trial
    court’s misconduct in Sturm prejudicial, in part, because the
    penalty verdict “was by no means a foregone conclusion” and
    there was evidence the jury could have credited to reach a
    different outcome. (Id. at p. 1244.) Evidence beneficial to the
    defense is therefore another factor that informs our analysis.
    127
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The substance of comments is also an important measure —
    improper remarks may be particularly prejudicial when the trial
    court has “interjected itself unnecessarily and inappropriately
    into the adversary process” or “undermined the defense theory
    of the case.” (Id. at p. 1243.)
    In reviewing the record, the trial court’s disdain for and
    distrust of defense counsel is inescapable — as is the perception
    the court found evidence from Dr. Ney, Dr. Plotkin, and Hall “ ‘to
    be questionable, at best.’ ” (Sturm, supra, 37 Cal.4th at p. 1243.)
    Although we conclude that the court’s misconduct could not
    have altered the jury’s guilt determination, we are unable to
    reach that conclusion regarding the penalty trial, thus finding
    prejudicial misconduct that requires reversal of the penalty
    judgment.
    a. Guilt phase
    The prosecution case against defendant included her
    surviving son F.D. describing how she gathered his sisters
    together to sleep in the kitchen and insisted that F.D. join them
    when he resisted. Defense and prosecution experts agreed the
    fire was intentionally set and defendant essentially admitted
    starting the fire. There was also compelling evidence that just
    before the fire defendant sent a note to her ex-husband angrily
    taunting him with her plan of murder-suicide and sent a letter
    to her ex-boyfriend appearing to blame their breakup for her
    impending acts.
    Defendant’s testimony that she lay down with her
    children, turned the oven on to warm her feet, and remembered
    little else, was difficult to credit. The prosecution effectively
    impeached defendant’s claimed memory loss with notes from a
    defense expert that documented defendant’s description of
    128
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    events, including writing letters to her ex-husband and ex-
    boyfriend late in the evening, driving to the post office to mail
    them, and holding a lighter and seeing a flash of flames.
    The defense relied on the jury accepting a theory, set forth
    in testimony by Drs. Ney and Plotkin, that defendant may have
    had a seizure or suffered from a medical syndrome that caused
    her behavior and lack of memory. Dr. Ney was a psychiatrist
    with unusual credentials who had never qualified to testify as
    an expert regarding the medical conditions he addressed. He
    was cavalier, and on basic details shown to be inaccurate, in his
    far-reaching claims about the medical and mental health
    processes that might have affected defendant’s behavior. The
    trial court’s suggestion that Dr. Ney “just doesn’t know what
    he’s talking about,” though egregious, ultimately was not
    prejudicial given the other factors that independently, and
    severely, undermined Dr. Ney’s credibility — his questionable
    expertise, evasive and inconsistent testimony, unprofessional
    demeanor, substantial impeachment, and dubious claims that
    undermined the defense, including his suggestion that
    defendant was more likely to kill her children after having an
    abortion.
    We closely examine the prejudicial effect of the trial
    judge’s inexcusably hostile questioning and commentary during
    the testimony of Dr. Plotkin, who was potentially more credible
    than Dr. Ney. Dr. Plotkin found evidence to suggest that
    defendant had a seizure on the night of the fire. If true, it was
    possible that she was unaware of some of her actions due to a
    seizure-induced delirium. Dr. Plotkin also explained, however,
    that a person in a delirium would not be capable of complex
    behavior and thought.
    129
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    The evidence that defendant deliberately set a fire to kill
    her family included testimony that she planned ahead to compel
    her children sleep together on the kitchen floor, wrote letters
    indicating that she intended to kill herself and her children,
    drove to the post office to mail her letters, and intentionally
    poured and lit gasoline throughout the house. Confronted with
    this evidence on cross-examination, Dr. Plotkin agreed that a
    person could not engage in such activities while experiencing
    delirium. Under these circumstances, even if the jury fully
    credited Dr. Plotkin’s testimony, it did not offer a theory that
    reduced defendant’s culpability.
    The trial judge’s misconduct included pervasive
    mistreatment of defense counsel that began at the outset of trial.
    The judge disparaged defense counsel during his opening
    statement for suggesting that defendant had demons to
    overcome. The timing of those remarks and their substance —
    sarcasm about defendant’s troubled history — increased their
    potential for prejudice. (People v. Abel, 
    supra,
     53 Cal.4th at
    p. 916.) The many inappropriate remarks that followed focused
    on defense counsel’s violation of court rules, lack of preparation,
    and improper cross-examination of prosecution witnesses; and
    disparaging and erroneous comments about defense counsel’s
    discovery violations also suggested that the defense was trying
    to obstruct the prosecution.        Nonetheless, the improper
    comments were not as numerous as in Sturm, and the
    misconduct did not directly implicate defense theories or
    interfere with the presentation of defendant’s case-in-chief.
    (Cf. Sturm, supra, 37 Cal.4th at pp. 1241, 1243.)
    In Mahoney, supra, 
    201 Cal. 618
    , we concluded that the
    trial judge’s misconduct resulted in a “miscarriage of justice,”
    referring to former section 4½ of article VI of the California
    130
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    Constitution (id. at pp. 626–627) — the basis for our state
    harmless error standard (People v. Watson, supra, 46 Cal.2d at
    pp. 835–836). There, the trial judge disparaged defense counsel
    and witnesses and on numerous occasions “took to himself the
    task of examining witnesses.” (Mahoney, at p. 622.) The judge’s
    examination of witnesses focused on his belief in the defendant’s
    guilt, “eliminating the possibility” of defenses the witnesses
    might otherwise have endorsed. (Id. at p. 623.) Similarly, in
    Sturm, we observed that the trial court, by making more than
    30 sua sponte objections to the defense presentation of evidence
    (Sturm, 
    supra,
     37 Cal.4th at p. 1241), “interjected itself
    unnecessarily and inappropriately into the adversary process”
    (id. at p. 1243). The trial court informed the jury that
    premeditation was a “ ‘gimme’ ” in the penalty retrial, when the
    lack of premeditation was central to defendant’s case in
    mitigation, and thus “also substantively undermined the
    defense theory of the case.” (Ibid.)
    As we noted in Mahoney, “[t]he fact that a record shows a
    defendant to be guilty of a crime does not necessarily determine
    that there has been no miscarriage of justice.” (Mahoney, supra,
    201 Cal. at p. 627.) When the trial court disparages defense
    counsel and witnesses and “discredits the cause of the defense”
    (ibid.) with recurring, substantive interventions, “ ‘[w]hatever
    the degree of guilt of [the defendant] . . . those who know the
    circumstances surrounding his [or her] conviction are likely to
    feel that the verdict resulted from the conduct of the judge and
    not from the evidence.’ ” (Id. at p. 626.)
    Although the trial judge here expressed doubts about the
    credibility of key defense experts and disparaged the
    performance of defense counsel, this was not the persistent,
    direct interference with the presentation of defense evidence
    131
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    that we saw in Mahoney and Sturm. Considering the entirety
    of the guilt phase evidence and argument, we are not persuaded
    “ ‘that the verdict resulted from the conduct of the judge and not
    from the evidence.’ ” (Mahoney, supra, 201 Cal. at p. 626.)
    Defense counsel presented inconsistent and implausible
    theories that gave the jury little, if any, reason to doubt
    defendant’s guilt. We express no view concerning the adequacy
    of counsel’s performance. We simply observe that defendant has
    not shown that the trial judge’s inappropriate conduct was to
    blame for this performance or that the judge undermined
    defense evidence the jury might have credited to reach a more
    favorable result. (Sturm, at pp. 1243–1244; Mahoney, at p. 623.)
    Considered “in the context of the trial as a whole” (People v. Abel,
    
    supra,
     53 Cal.4th at p. 916), we can say under either the
    Chapman or Watson standards of review (Chapman v.
    California (1967) 
    386 U.S. 18
    , 24; People v. Watson (1956)
    
    46 Cal.2d 818
    , 836) that the jury would have reached the same
    verdict in the absence of the court’s misconduct.
    b. Penalty phase
    Our prejudice inquiry is more difficult with respect to the
    penalty phase, where the jury’s role “is not merely to find facts,
    but also — and most important — to render an individualized,
    normative determination about the penalty appropriate for the
    particular defendant.” (People v. Brown (1988) 
    46 Cal.3d 432
    ,
    448.)
    In the penalty phase closing arguments, the prosecutor
    highlighted evidence to counter the view that defendant had
    been a warm, caring person: school staff believed that defendant
    was overbearing and cold; a family member thought defendant’s
    children feared her; neighbors felt defendant lied during her
    132
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    divorce and tried to turn her children against Folden; and
    Fernando Nieves described defendant’s efforts to have F.D.
    removed from his custody after the fire and sent to live in
    another state. In seeking the death penalty, the prosecutor
    argued that defendant’s actions were manipulative and
    calculating — and that her suicide note to Folden revealed not
    depression, but anger, revenge, spite, and control.         The
    prosecutor urged jurors to reject any suggestion that defendant
    was mentally unstable and noted that defense experts had not
    found evidence of psychosis when they examined her.
    Reiterating defendant’s plan to burn her children to death, the
    prosecutor argued that defendant “tried to kill herself because
    she knew her own crimes were so hideous she didn’t want to be
    around for the aftermath.”
    Abandoning the position that defendant acted in an
    unconscious delirium, in the penalty phase defense counsel
    reiterated evidence that defendant was distraught over her
    relationships, abortion, and finances and argued that she had
    come “unglued.” Defense counsel portrayed defendant as an
    emotionally fragile woman troubled by an abusive childhood,
    devoted to her children, and overcome by depression and
    thoughts of suicide. Pointing to defendant’s intent to commit
    suicide as extreme mental and emotional disturbance, counsel
    asked the jury to show mercy for “a tortured soul who all the
    days of her life will have to relive an act of madness, and the . . .
    nightmares that go with it.”
    Evidence of mental disturbance from the guilt trial, which
    defendant’s claim of unconsciousness had rendered superfluous,
    lent some support to her penalty phase argument. (See People
    v. Gonzales, 
    supra,
     51 Cal.4th at p. 953, fn. 34.) Defendant’s son
    testified that she woke the children during the fire to help them
    133
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    avoid breathing the smoke, a fact the defense highlighted to
    show defendant’s confusion after setting the fire and her desire
    to protect the children from it. The defense reiterated the
    conclusion of a prosecution expert that defendant could be
    vulnerable to psychotic episodes that might arise due to
    depression or bipolar disorder. Dr. Plotkin later noted that in
    addition to her depression, defendant had been diagnosed with
    bipolar disorder and was being treated for it in jail. The defense
    also highlighted research by a prosecution expert showing that
    most women who killed their children were not “coldhearted”
    but experienced psychosis, depression, and other mental health
    disorders. On cross-examination during the guilt phase, and
    contrary to her defense, defendant admitted that she had been
    thinking about suicide her entire life.
    Defense counsel began his opening penalty phase
    statement by remarking on his disappointment in the jury’s
    guilt verdict, the challenge of appearing before the jury again
    after his guilt phase arguments had been rejected, and his
    respect for the jury’s guilt phase decision. After sustaining
    objections to each of counsel’s remarks as improper argument,
    the trial judge admonished counsel in front of the jury: “If you
    can’t tell us what you expect the evidence will show, sit down
    and don’t say anything more.”
    Later in the opening statement, dismissing counsel’s
    insistence that he was addressing matters the evidence would
    establish, the trial judge sustained additional objections to
    improper argument when defense counsel began to comment on
    defendant’s relationship with her ex-husband. The judge then
    abruptly demanded to know, “How much more do you have?” As
    counsel responded — stating, “I would respectfully ask for the
    court’s indulgence. I am trying to put in what I believe . . .” —
    134
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    the court interrupted: “[D]on’t explain to me what you are trying
    to do. [¶] I am telling you what you cannot do. If you continue
    to do it, I will terminate your opening statement.” The trial
    judge’s display of such disregard for counsel as he made his
    initial plea to spare defendant’s life increased the potential for
    prejudice flowing from the judge’s comments. (People v. Abel,
    
    supra,
     53 Cal.4th at p. 916.)
    As noted earlier, in comments before the jury during the
    guilt phase, the trial judge ridiculed defense counsel, portrayed
    him as wasting the jury’s time, highlighted his violation of court
    rules, accused him of purposely misleading the jury, and
    announced the imposition of a monetary sanction. The trial
    judge suggested that a key defense expert did not know what he
    was talking about, and his hostile questioning led another
    defense expert to remark that the defense experts were made
    out to be liars. Though we concluded that this misconduct was
    not prejudicial in the guilt phase, it undoubtedly impressed
    upon the jury the court’s disdain and served to “discredit[] the
    cause of the defense.” (Mahoney, supra, 201 Cal. at p. 627;
    People v. Woodruff, supra, 5 Cal.5th at p. 768.)
    In the penalty phase, the trial judge continued to impugn
    defense counsel’s performance and cited him for misconduct and
    contempt in front of the jury. We have observed that when a
    judge regularly denigrates the performance of counsel “ ‘it is not
    the lawyer who pays the price, but the client.’ ” (Sturm, 
    supra,
    37 Cal.4th at p. 1240; cf. Sacher v. United States (1952) 
    343 U.S. 1
    , 10 [to “pronounce [a lawyer] guilty of contempt is not unlikely
    to prejudice his client”].) When defendant’s friends testified, the
    prosecution exhibited pictures of the deceased victims and
    mocked the witnesses for voicing fondness, admiration, and
    sympathy for defendant following her conviction. The trial
    135
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    judge appeared to echo this contempt when he chastised Carl
    Hall and accused him of wrongdoing.
    The trial judge erroneously sustained objections to
    questions that sought to bolster the testimony of a chaplain
    attesting to defendant’s remorse for the crimes; the judge also
    repeatedly and erroneously sustained objections to questions
    about defendant’s nonviolence and the value she brought to the
    lives of others. The “very act” of sustaining those objections
    “tended to mislead the jury” (People v. Hill (1992) 
    3 Cal.4th 959
    ,
    1009) — by minimizing defendant’s mitigating evidence and
    communicating that defendant’s valued attributes were “not
    worth considering” (Sturm, 
    supra,
     37 Cal.4th at p. 1239). The
    trial judge’s hostility and impatience with the defense were
    further evident in the judge’s erroneous exclusion of whole
    categories of mitigating evidence — Dr. Boone’s testimony
    regarding defendant’s neuropsychological test results and
    cognitive impairment and PET scan results portraying brain
    injury consistent with defendant’s childhood traumas and
    neuropsychological testing.
    The trial court also improperly instructed the jury to
    consider the “weight and significance” of defendant’s failure to
    provide timely discovery concerning eight of twelve penalty
    phase witnesses — an error we earlier found harmless when
    viewed in isolation. Because the trial court repeatedly chastised
    defense counsel and expressed doubts about the defense,
    however, the erroneous instruction and improper aggravating
    factor were apt to contribute to the perception that defendant
    was manipulative and that her mitigating evidence was not to
    be trusted. (Sturm, supra, 37 Cal.4th at p. 1243.)
    136
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    During defense counsel’s closing argument, the trial judge
    unnecessarily remarked about defense counsel misstating the
    law and admonished the jury to disregard counsel’s argument
    that aspects of defendant’s background were mitigating. The
    judge later gave a cautionary instruction that gratuitously
    implied that defense counsel was improperly characterizing the
    case in mitigation. As with the judge’s remarks during counsel’s
    opening statement, the timing of these interventions increased
    their prejudicial effect. (People v. Abel, 
    supra,
     53 Cal.4th at
    p. 916.)
    “Considered in the aggregate,” the impact of the trial
    judge’s misconduct grew as his inappropriate comments
    continued throughout the trial; the judge’s improper remarks
    also increased in frequency during the short span allowed for
    the penalty trial — not quite five days from start to finish — and
    included threats and disparaging comments whose timing
    interfered with both the opening statement and closing
    argument for the defense. (Sturm, supra, 37 Cal.4th at p. 1243.)
    Ultimately, the trial judge’s conspicuous disdain for defense
    counsel and witnesses, and his repeated references to their
    improper or untrustworthy conduct, lent credence to the
    prosecution’s argument that defendant was manipulative and
    deceitful. These were the very characteristics the prosecution
    highlighted to justify the death penalty. The trial judge
    effectively threw “the weight of his judicial position” (Mahoney,
    supra, 201 Cal. at p. 627) behind the prosecution’s case and
    erroneously excluded relevant and potentially beneficial
    mitigating evidence, thus “undermin[ing] the defense theory of
    the case.” (Sturm, at p. 1243).
    We rely on a capital sentencing jury to “confront and
    examine the individuality of the defendant” and consider any
    137
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    “ ‘compassionate or mitigating factors stemming from the
    diverse frailties of humankind.’ ” (Caldwell v. Mississippi (1985)
    
    472 U.S. 320
    , 330.) That critical function was compromised
    here, where “numerous instances of misconduct created an
    atmosphere of unfairness and were likely to have led the jury to
    conclude that ‘the trial court found the People’s case against
    [defendant] to be strong and [defendant]’s evidence to be
    questionable, at best.’ ” (Sturm, supra, 37 Cal.4th at p. 1243.)
    We consider how the jury “might have responded
    differently” (People v. Smith (2015) 
    61 Cal.4th 18
    , 60) in
    undertaking its sentencing decision in a trial unaffected by such
    misconduct. It is not difficult to imagine the horror a jury might
    feel in response to defendant’s actions. Nonetheless, a juror
    could regard the stunning enormity of the crime, and the fact
    that defendant intended to take her own life, as a sign of
    significant mental instability.       Absent the trial judge’s
    persistent, disparaging remarks, a juror might have viewed
    these circumstances with greater sympathy and concluded the
    crime was a tragedy lacking the moral culpability to warrant
    death. A juror might also have given greater weight to
    defendant’s remorse and evidence she had been a loving mother
    to conclude that life in prison, confronted each day with what
    she had done to her children, was a fitting punishment.
    Although we cannot be certain the jury would have reached a
    different verdict in the absence of the judge’s commentary, we
    are unable to say the penalty “verdict was ‘ “surely
    unattributable” ’ to the trial court’s [misconduct].” (People v.
    Grimes (2016) 
    1 Cal.5th 698
    , 723.) Instead, we find “a
    ‘reasonable (i.e., realistic) possibility’ ” (ibid.) that the outcome
    would have been different without the weight of judicial
    138
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    authority favoring the prosecution and hence we must set aside
    the judgment of death.
    E. Cumulative Error
    Defendant contends that claims considered harmless in
    isolation are nonetheless cumulatively prejudicial. We have
    found or assumed seven errors: (1) erroneous guilt phase
    instructions regarding discovery violations; (2) error limiting
    mental state testimony by defense experts in the guilt phase;
    (3) exclusion of a neuropsychological expert in the penalty
    phase; (4) exclusion of defendant’s PET scan results from the
    penalty phase; (5) exclusion of mitigating evidence from lay
    witnesses; (6) erroneous penalty phase instructions regarding
    discovery violations; and (7) judicial misconduct, which we have
    concluded was prejudicial in the penalty phase.
    Regarding the guilt phase, we have held that the
    erroneous discovery violation instruction and limitation on
    expert testimony were harmless when considered individually.
    We concluded that experts were not prevented from addressing
    the bulk of information the defense sought to convey and that
    the erroneous instruction did not affect the outcome of this trial.
    Considered cumulatively, these errors do not warrant reversal
    of the guilt judgment.
    Although we need not address the cumulative effect of
    penalty phase errors given our resolution of the judicial
    misconduct claim, we note that the prejudicial impact of
    additional penalty phase errors — the improper exclusion of a
    neuropsychological expert, PET scan results, and mitigating
    testimony from lay witnesses, and the erroneous instruction
    related to penalty phase discovery violations — increases when
    139
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    considered in conjunction with the judicial misconduct, an effect
    we have noted in our prejudice discussion for that claim.
    F. Restitution
    Defendant contends the trial court violated her rights to
    due process and to confront evidence against her when, in her
    absence, it imposed a restitution fine and ordered payment of
    victim restitution. She claims the trial court further erred by
    failing to make findings concerning her ability to pay.
    During defendant’s sentencing, the trial court neglected to
    impose a restitution fine required by section 1202.4, subdivision
    (b) or order direct victim restitution as required by section
    1202.4, subdivision (f).      Defendant was not present at
    subsequent hearings that addressed restitution: one in which
    the trial court imposed a maximum $10,000 fine, and another in
    which the court ordered victim restitution of $24,579.99
    regarding claims already filed and left some future claims to be
    determined. There were no reasons given for defendant’s
    absence and no indication she waived her presence at the
    hearings. Defense counsel opposed the restitution fine, citing
    defendant’s inability to pay, and challenged the direct victim
    restitution on several bases, including by offering a showing
    that victims’ family members had already received payments
    from life insurance policies maintained by defendant.
    A criminal defendant has a “constitutional and statutory
    right to be present at [a] sentence modification hearing and
    imposition of sentence.” (People v. Robertson (1989) 
    48 Cal.3d 18
    , 60; see also Cal. Const., art. I, § 15; Pen. Code, §§ 977, subd.
    (b)(1), 1193.)    We have acknowledged restitution as “a
    significant aspect of a criminal sentence.” (Briggs v. Brown
    (2017) 
    3 Cal.5th 808
    , 831; see also People v. Tillman (2000)
    140
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    
    22 Cal.4th 300
    , 301 [judgment of conviction includes restitution
    fine]; cf. Oregon v. Ice (2009) 
    555 U.S. 160
    , 171 [sentencing
    determinations include “statutorily prescribed fines and orders
    of restitution”].) And we have confirmed defendant’s right to be
    present when the trial court imposes restitution. (See People v.
    Frederickson (2020) 
    8 Cal.5th 963
    , 1027 [striking restitution not
    imposed in open court and in defendant’s presence].)
    The People argue that any rights defendant had to be
    present at either of the restitution hearings were forfeited by
    defense counsel’s failure to object to her absence. A defendant
    may waive her constitutional right to be present for sentencing
    “as long as [her] waiver is voluntary, knowing and intelligent.”
    (People v. Davis (2005) 
    36 Cal.4th 510
    , 531.) “[A] defendant’s
    statutory ability to waive [her] presence in a capital case is more
    circumscribed than the associated ability to waive [her]
    constitutional right.” (People v. Rundle (2008) 
    43 Cal.4th 76
    ,
    135.) There is no indication that defendant made any valid
    waiver of her right to be present, and counsel’s failure to object
    does not forfeit the claim. (People v. Penunuri (2018) 
    5 Cal.5th 126
    , 162.)
    We therefore consider whether the error prejudiced
    defendant. (People v. Penunuri, supra, 5 Cal.5th at p. 163;
    People v. Davis, 
    supra,
     36 Cal.4th at p. 532.) The People observe
    defense counsel was present at both hearings, raised
    defendant’s inability to pay the restitution fine, and disputed
    payment of victim restitution, and they assert that defendant
    would not have made any additional contributions if present.
    Defendant claims that she was in the best position to address
    her ability to pay and details about her life insurance policy.
    141
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    There is nothing in the record to indicate that defendant
    would have added any significant information about her
    inability to pay beyond that presented by defense counsel.
    Defense counsel received notice of the proposed victim
    restitution almost two months prior to the hearing and thus
    “had ample opportunity to discuss the contents with defendant
    and to seek [her] assistance . . . . Assuming [counsel] did so,
    defendant’s presence at the hearing would have added little to
    [her] attorney[’s] ability to argue” the propriety of the victim
    restitution payments. (People v. Davis, 
    supra,
     36 Cal.4th at
    p. 533.)   We conclude that defendant’s absence from the
    restitution proceedings was therefore harmless beyond a
    reasonable doubt.
    We also reject defendant’s contention that the trial court
    erred by failing to make findings regarding her ability to pay.
    Defendant cites People v. Richardson (2008) 
    43 Cal.4th 959
     in
    support of her claim; however, the reference to findings in that
    case concerned requirements that had been repealed and are
    inapplicable here. (Id. at p. 1038.) The provisions of section
    1202.4 in effect at defendant’s trial, as now, state that “[e]xpress
    findings by the court as to the factors bearing on the amount of
    the fine shall not be required.” (§ 1202.4, subd. (d).) “[T]he
    absence of any findings does not demonstrate [the court] failed
    to consider this factor. Thus, we cannot say on this record that
    the trial court abused its discretion.” (People v. Gamache, 
    supra,
    48 Cal.4th at p. 409.)
    Defendant further claims the trial court failed to consider
    her ability to pay when ordering direct victim restitution. This
    argument fails because section 1202.4 provides that inability to
    pay shall not be a consideration in determining the amount of a
    restitution order. (§ 1202.4, subd. (g).)
    142
    PEOPLE v. NIEVES
    Opinion of the Court by Cantil-Sakauye, C. J.
    III.   DISPOSITION
    We reverse the death sentence and affirm the judgment in
    all other respects.
    CANTIL-SAKAUYE, C. J.
    We Concur:
    CORRIGAN, J.
    LIU, J.
    CUÉLLAR , J.
    KRUGER, J.
    GROBAN, J.
    JENKINS, J.
    143
    See next page for addresses and telephone numbers for counsel who
    argued in Supreme Court.
    Name of Opinion People v. Nieves
    __________________________________________________________________
    Procedural Posture (see XX below)
    Original Appeal XX
    Original Proceeding
    Review Granted (published)
    Review Granted (unpublished)
    Rehearing Granted
    __________________________________________________________________
    Opinion No. S092410
    Date Filed: May 3, 2021
    __________________________________________________________________
    Court: Superior
    County: Los Angeles
    Judge: L. Jeffrey Wiatt
    __________________________________________________________________
    Counsel:
    Amitai Schwartz, under appointment by the Supreme Court, and
    Moira Duvernay for Defendant and Appellant.
    Kamala Harris and Xavier Becerra, Attorneys General, Dane R.
    Gillette and Lance E. Winters, Chief Assistant Attorneys General,
    Pamela C. Hamanaka and James William Bilderback II, Assistant
    Attorneys General, Keith H. Borjon, Mary Sanchez, Jaime L. Fuster
    and Kristen J. Inberg, Deputy Attorneys General, for Plaintiff and
    Respondent.
    Counsel who argued in Supreme Court (not intended for
    publication with opinion):
    Amitai Schwartz
    Law Offices of Amitai Schwartz
    2000 Powell St., Suite 1286
    Emeryville, CA 94608
    (510) 597-1775
    Kristen J. Inberg
    Deputy Attorney General
    3000 South Spring St., Suite 1702
    Los Angeles, CA 90013
    (213) 269-6189