State of Arizona v. Stephen Jay Malone Jr , 247 Ariz. 29 ( 2019 )


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  •                                   IN THE
    SUPREME COURT OF THE STATE OF ARIZONA
    __________
    STATE OF ARIZONA,
    Appellee,
    v.
    STEPHEN JAY MALONE JR.,
    Appellant.
    ____________________
    No. CR-18-0431-PR
    Filed July 17, 2019
    __________________
    Appeal from the Superior Court in Pima County
    The Honorable Richard D. Nichols, Judge
    No. CR20132518-001
    AFFIRMED
    Opinion of the Court of Appeals, Division Two
    
    245 Ariz. 103
    (App. 2018)
    VACATED
    ____________
    COUNSEL:
    Mark Brnovich, Arizona Attorney General, O.H. Skinner, Solicitor General,
    Joseph T. Maziarz, Chief Counsel, Criminal Appeals Section, Michael T.
    O’Toole (argued), Assistant Attorney General, Phoenix, Attorneys for State
    of Arizona
    James L. Fullin, Pima County Legal Defender, Jeffrey Kautenburger
    (argued), Assistant Legal Defender, Pima County Legal Defender’s Office,
    Tucson, Attorneys for Stephen Jay Malone Jr.
    David J. Euchner, Tucson, Attorney for Amicus Curiae Arizona Attorneys
    for Criminal Justice
    STATE v. MALONE
    Opinion of the Court
    ____________________
    JUSTICE TIMMER authored the opinion of the Court, in which VICE
    CHIEF JUSTICE BRUTINEL and JUSTICES BOLICK, GOULD, LOPEZ, and
    PELANDER (RETIRED) joined. CHIEF JUSTICE BALES dissented in part
    and concurred in the judgment.
    JUSTICE TIMMER, opinion of the Court:
    ¶1            Although a defendant cannot use evidence of a mental
    disease or defect to show he did not form a crime’s requisite mental state
    (mens rea), see State v. Mott, 
    187 Ariz. 536
    , 541 (1997); State v. Schantz, 
    98 Ariz. 200
    , 212–13 (1965), he may use evidence of a character trait for
    impulsivity to cast doubt on the existence of premeditation, see State v.
    Christensen, 
    129 Ariz. 32
    , 35 (1981), which forms part of the mens rea for first
    degree murder under A.R.S. § 13-1105(A)(1), see State v. Boyston, 
    231 Ariz. 539
    , 549 ¶ 50 (2013). Here, we decide whether a defendant who introduces
    expert evidence of a character trait for impulsivity to challenge
    premeditation may also introduce evidence of brain damage to corroborate
    the existence of that trait. We hold he cannot.
    BACKGROUND
    ¶2             Stephen Jay Malone Jr. and A.S. lived together in a
    tumultuous romantic relationship. On June 9, 2013, A.S. left Malone,
    moving from their home with their three children. Two evenings later, A.S.,
    along with her sister, E.S., and two of the children, drove to the home to
    return a gift to Malone. On the way, A.S. spoke to Malone by phone and
    told him that despite his threats, she was leaving him. When A.S. arrived,
    Malone came up to the car, took the returned gift, and asked her to stay so
    his mother, who was in the house, could see the children. A.S. refused and
    drove away; Malone quickly followed in another car. After a five-to-six-
    minute chase, during which Malone blocked A.S.’s car twice, Malone
    jumped from his car and fired multiple gunshots into A.S.’s car, killing A.S.
    and injuring E.S.
    ¶3            The State indicted Malone on several charges, including
    premeditated first degree murder, see § 13-1105(A)(1), the only charge at
    issue here. Before trial, the State moved to preclude expert testimony from
    psychologist James Sullivan, Ph.D, that Malone’s performance on
    neuropsychological assessment tests was “consistent with significant and
    2
    STATE v. MALONE
    Opinion of the Court
    permanent diffuse brain damage,” meaning Malone was “more likely to
    have a character trait for impulsivity.” (Dr. Sullivan did not obtain an MRI
    scan or like evidence to bolster his assessment that Malone had brain
    damage.) While acknowledging that Christensen permitted Dr. Sullivan to
    testify that Malone had a character trait for impulsivity, the State argued
    that Mott precluded evidence that brain damage made the existence of this
    trait more likely. Over defense objection, the trial court granted the motion
    and precluded Dr. Sullivan from offering an opinion at trial regarding brain
    damage.
    ¶4            At trial, Malone rebutted the State’s allegation that he
    premeditated A.S.’s murder by introducing evidence suggesting he had
    acted impulsively. To that end, Dr. Sullivan testified that, based on his
    observations and psychological tests, Malone had a character trait for
    impulsivity. Dr. Sullivan explained that people with this character trait are
    compromised in their ability to think through the consequences of their
    actions before acting, although they are capable of doing so. The State did
    not contest that Malone had a character trait for impulsivity but
    nevertheless maintained he premeditated A.S.’s murder. The jury agreed
    and found Malone guilty as charged.
    ¶5            In a split decision, the court of appeals concluded the trial
    court erred by precluding Dr. Sullivan’s testimony concerning brain
    damage. State v. Malone, 
    245 Ariz. 103
    , 107 ¶ 16 (App. 2018). The court
    nevertheless found the error harmless and therefore affirmed. 
    Id. at 108–09
    ¶ 22.
    ¶6            We granted Malone’s petition for review (challenging
    harmless error) and the State’s cross-petition for review (challenging error)
    because they involve a recurring issue of statewide importance. We have
    jurisdiction pursuant to article 6, section 5 of the Arizona Constitution.
    DISCUSSION
    I.
    ¶7             We review the trial court’s preclusion of Dr. Sullivan’s brain-
    damage testimony for an abuse of discretion. See State v. Leteve, 
    237 Ariz. 516
    , 524 ¶ 18 (2015). “An error of law committed in reaching a discretionary
    conclusion may, however, constitute an abuse of discretion.” State v. Wall,
    
    212 Ariz. 1
    , 3 ¶ 12 (2006).
    3
    STATE v. MALONE
    Opinion of the Court
    II.
    ¶8             Before addressing the admissibility of Dr. Sullivan’s brain-
    damage testimony, we set forth general legal principles underlying the
    issue. First, apart from insanity, Arizona does not permit a defendant to
    introduce evidence of a mental disease or defect as either an affirmative
    defense or to negate the mens rea element of a crime. See 
    Mott, 187 Ariz. at 540
    –41; 
    Schantz, 98 Ariz. at 212
    ; see also A.R.S. § 13-502(A) (“A person may
    be found guilty except insane if at the time of the commission of the criminal
    act the person was afflicted with a mental disease or defect of such severity
    that the person did not know the criminal act was wrong.”). Thus, for
    example, in Mott this Court held that the trial court properly excluded
    evidence that the defendant suffered from battered-woman syndrome
    because it was offered to negate the mens rea element for child abuse
    (knowledge or 
    intent). 187 Ariz. at 539
    , 544–45. And in Schantz we held
    that the trial court properly refused a jury instruction that would have
    permitted the jury to consider expert evidence that the defendant killed his
    wife “without his deliberate volitional conscious awareness” to contest the
    mens rea element for second degree murder (malice 
    aforethought). 98 Ariz. at 204
    –06, 213.
    ¶9             Using mental disease or defect evidence to refute the mens rea
    element of a crime is commonly referred to as a “diminished capacity” or
    “diminished responsibility” defense. 
    Mott, 187 Ariz. at 540
    ; see 
    Leteve, 237 Ariz. at 524
    ¶ 20. Such evidence does not provide a complete defense to a
    crime or excuse it but “establish[es], by negating the requisite intent for a
    higher degree of the offense, that in fact a lesser degree of the offense was
    committed.” McCarthy v. State, 
    372 A.2d 180
    , 182 (Del. 1977) (quoting C.T.
    Drechsler, Annotation, Mental or Emotional Condition as Diminishing
    Responsibility for Crime, 
    22 A.L.R. 3d 1228
    , 1238 (1968)). As mentioned,
    Arizona does not permit this defense. See 
    Mott, 187 Ariz. at 540
    –41; 
    Schantz, 98 Ariz. at 212
    .
    ¶10          Second, evidence of a defendant’s behavioral tendencies is
    not diminished capacity evidence and may be admitted to challenge the
    mens rea of premeditation for a first degree murder charge. See 
    Christensen, 129 Ariz. at 35
    –36. The defendant in Christensen was charged with
    premeditated first degree murder and sought to elicit a psychiatrist’s
    testimony that, based on interviews and diagnostic testing results, the
    defendant “had difficulty dealing with stress and in stressful situations his
    actions were more reflexive than reflective.” 
    Id. at 34.
    The trial court
    precluded the testimony as diminished capacity evidence. 
    Id. This Court
    4
    STATE v. MALONE
    Opinion of the Court
    reversed, reasoning that the testimony evinced a character trait that
    “tend[ed] to establish that [the defendant] acted impulsively” and would
    have assisted jurors in determining whether the defendant acted with
    premeditation. 
    Id. at 35;
    see also Ariz. R. Evid. 404(a)(1) (authorizing
    admission of character trait evidence offered by an accused); Ariz. R. Evid.
    405(a) (stating that character trait evidence can be offered as an opinion).
    The Court cautioned, however, that an expert witness could not opine as to
    whether a defendant was acting reflectively or reflexively at the time of the
    murder. 
    Christensen, 129 Ariz. at 35
    –36.
    ¶11            The United States Supreme Court in Clark v. Arizona, 
    548 U.S. 735
    , 757 (2006), coined the term “observation evidence” to describe the type
    of character trait evidence permitted in Christensen. See also State v. Richter,
    
    245 Ariz. 1
    , 8 ¶ 33 (2018); 
    Leteve, 237 Ariz. at 401
    ¶ 21. “Observation
    evidence” is a slight misnomer, however, as the psychiatrist’s opinion in
    Christensen, like Dr. Sullivan’s proffered brain-damage testimony here,
    depended on results from diagnostic tests administered to the defendant as
    well as the psychiatrist’s personal observations of him. See 
    Christensen, 129 Ariz. at 34
    . A more accurate term for the evidence deemed admissible in
    Christensen is “behavioral-tendency evidence,” which is admissible to show
    a character trait. See 
    Mott, 187 Ariz. at 544
    (describing Christensen as
    involving “evidence about [the defendant’s] behavioral tendencies”); see
    also Ariz. R. Evid. 404(a)(1) (permitting evidence of an accused’s pertinent
    character trait).
    III.
    A.
    ¶12            Turning to this case, the dispute is whether Dr. Sullivan’s
    proffered brain-damage testimony was inadmissible diminished capacity
    evidence under Schantz and Mott, as the trial court ruled, or admissible
    behavioral-tendency evidence under Christensen, as the court of appeals
    concluded. We quickly reject Malone’s assertion that Mott could not apply
    here because it only considered psychological conditions, not brain
    damage, as mental diseases or defects underlying prohibited diminished
    capacity defenses.       Nothing in Mott draws this fine distinction.
    Significantly, in overruling State v. Gonzales, 
    140 Ariz. 349
    (1984), which had
    approved use of expert testimony that a defendant’s “low intelligence and
    probable organic brain damage affected his ability to reason” and made him
    unable to form the mens rea for rape, Mott necessarily considered brain
    damage as a mental defect by characterizing the expert’s testimony in
    5
    STATE v. MALONE
    Opinion of the Court
    Gonzales as diminished capacity evidence. 
    Mott, 187 Ariz. at 544
    .
    Dr. Sullivan’s precluded brain-damage testimony constitutes the type of
    mental-defect evidence addressed by Mott.
    ¶13           Malone next argues that mental disease or defect evidence is
    only inadmissible under Mott if that disease or defect rendered the
    defendant entirely incapable of forming the requisite mens rea. Thus,
    because Dr. Sullivan’s proffered brain-damage testimony purportedly
    would have shown only that Malone was impulsive and therefore less
    likely to premeditate but not incapable of doing so, Mott is inapplicable.
    The State counters that Mott precluded all mental disease or defect evidence
    unless used to show legal insanity under § 13-502, meaning the brain-
    damage evidence here was properly precluded.
    ¶14           We do not view Mott as precluding only mental disease or
    defect evidence that renders a defendant incapable of forming mens rea.
    Malone relies on language in Mott that, in isolation, supports his
    interpretation. See 
    Mott, 187 Ariz. at 544
    (distinguishing Christensen by
    noting that the evidence there “was not that [Christensen] was incapable, by
    reason of a mental defect, of premeditating or deliberating but that, because
    he had a tendency to act impulsively, he did not premeditate the homicide.
    Because he was not offering evidence of his diminished capacity, but only
    of a character trait relating to his lack of premeditation, the defendant was
    not precluded from presenting the expert testimony.”). But the disputed
    evidence in Mott was expert testimony that the “defendant was not capable
    of forming the requisite mental state of knowledge or intent,” so it is not
    surprising the Court focused on incapability when distinguishing
    Christensen. See 
    id. at 540.
    ¶15            Elsewhere in Mott, the Court indicated that prohibited mental
    disease or defect evidence included anything affecting a defendant’s
    actions, excepting evidence of legal insanity. See 
    id. at 540,
    544 (describing
    prohibited diminished capacity evidence as “negat[ing] the mens rea” and
    concluding that evidence “affect[ing] the defendant’s capacity” to decide
    whether to get medical help for her child is inadmissible as diminished
    capacity evidence (emphasis removed)). And significantly, Mott overruled
    Gonzales, which had concluded that evidence of impaired cognitive
    functioning that affected the defendant’s judgment was relevant to whether
    he acted with the requisite mens rea and therefore admissible. See 
    Mott, 187 Ariz. at 544
    ; 
    Gonzales, 140 Ariz. at 350
    , 352–53.
    6
    STATE v. MALONE
    Opinion of the Court
    ¶16              This Court’s pre-Mott decisions are in accord with our view.
    See, e.g., State v. Ramos, 
    133 Ariz. 4
    , 6 (1982) (“Psychiatric testimony to negate
    specific intent has consistently been excluded.”); State v. Briggs, 
    112 Ariz. 379
    , 382 (1975) (“Arizona does not permit psychiatric evidence of a mental
    disease or defect negativing a state of mind.”); State v. Malumphy, 
    105 Ariz. 200
    , 202 (1969) (concluding that the trial court properly “refus[ed] to
    instruct the jury that it could consider evidence of defendant’s mental
    condition in determining whether defendant, in fact, entertained
    premeditation and deliberation” as that instruction “embodies the precept
    commonly referred to as the doctrine of ‘diminished responsibility,’” which
    Arizona rejects); 
    Schantz, 98 Ariz. at 207
    –08 (describing diminished
    responsibility evidence as permitting a jury to “consider defects in the
    volitional processes to determine the lack of deliberation and
    premeditation” or “the lack of malice aforethought”).
    ¶17            Mott’s focus on the adoption of our criminal code further
    illuminates the Court’s view that prohibited diminished capacity evidence
    includes a mental disease or defect that reduces the likelihood that a
    defendant formed the requisite mens rea. The Court noted that the
    legislature “declined to adopt the defense of diminished capacity” set forth
    in the 1962 version of the Model Penal Code (“MPC”) § 4.02(1): “Evidence
    that the defendant suffered from a mental disease or defect is admissible
    whenever it is relevant to prove that the defendant did or did not have a
    state of mind that is an element of the 
    offense.” 187 Ariz. at 540
    ; see also
    
    Schantz, 98 Ariz. at 212
    –13 (declining to adopt then-draft MPC § 4.02(1)
    “piecemeal” and deferring to the legislature whether to adopt or reject it as
    part of article 4 of the draft MPC). According to the Court, “[t]his section
    was written in recognition of the existence of degrees of mental disease or
    defect that fall short of that required for invoking the defense of
    irresponsibility [legal insanity], but that may be put in evidence as tending
    to show that the defendant lacked the specific mens rea required for the
    commission of the offense charged.” 
    Mott, 187 Ariz. at 540
    (internal
    quotation marks omitted) (quoting MPC and Commentaries § 4.02(1) cmt.
    2 (1985)). By omitting § 4.02(1) from our code, the Court reasoned, the
    legislature rejected “use of psychological testimony to challenge the mens
    rea element of a crime.” 
    Id. In other
    words, mental disease or defect
    evidence falling short of demonstrating legal insanity cannot be admitted
    to challenge the mens rea element of a charged offense. See 
    Clark, 548 U.S. at 762
    (“[W]e understand that Mott is meant to confine to the insanity
    defense any consideration of characteristic behavior associated with mental
    disease.”); 
    Leteve, 237 Ariz. at 524
    ¶ 20 (reaffirming that diminished capacity
    evidence cannot be used to negate mens rea and describing such evidence
    7
    STATE v. MALONE
    Opinion of the Court
    as a “mental disorder short of insanity” (citing 
    Mott, 187 Ariz. at 541
    )); State
    v. Jacobson, 
    244 Ariz. 187
    , 193 ¶ 21 (App. 2017) (stating expert evidence that
    hormonal changes “could affect planning, thinking, mental state, judgment,
    insight, perception and memory” was diminished capacity evidence
    prohibited by Mott).
    ¶18           The court of appeals acknowledged that Dr. Sullivan’s
    proffered brain-damage testimony was diminished capacity evidence. See
    
    Malone, 245 Ariz. at 106
    ¶¶ 7, 9. But the court viewed Mott’s differentiation
    of Christensen as authorizing admission of mental disease or defect evidence
    for the purpose of showing a behavioral tendency that negates mens rea.
    
    Id. at 106–07
    ¶¶ 10–12. Because Dr. Sullivan’s test results “were offered to
    demonstrate a brain condition that rendered it less likely” that Malone
    premeditated the murder, the evidence was deemed admissible “to
    corroborate the defendant’s claims that he had a character trait of
    impulsivity.” 
    Id. ¶ 11.
    The court noted that the trial court could have
    facilitated proper use of the evidence with a limiting instruction or other
    measures. See 
    id. at 107
    ¶ 15.
    ¶19            We reject the court of appeals’ purpose-oriented standard for
    admitting mental disease or defect evidence to negate mens rea. As
    previously discussed, see supra ¶ 17, Arizona has not adopted MPC
    § 4.02(1), which would have permitted Dr. Sullivan’s brain-damage
    testimony as relevant to the existence of mens rea. Consequently, mental
    disease or defect evidence, whether introduced to show a defendant’s
    inability to form mens rea or a likelihood he failed to do so, cannot be used
    to negate mens rea.
    ¶20           We are not persuaded to reach a different result because the
    proffered brain-damage testimony corroborates the existence of a
    behavioral tendency. We agree with the court of appeals’ dissent that,
    regardless of the corroborating character of this evidence, it was
    inescapably offered to refute premeditation and is therefore inadmissible
    under Schantz and Mott. 
    Malone, 245 Ariz. at 111
    ¶ 38 (Brearcliffe, J.,
    concurring in part and dissenting in part). To conclude otherwise would
    circumvent Arizona’s longstanding jurisprudence, including those cases,
    by permitting defendants to introduce evidence of a behavioral tendency
    and then “corroborating” its existence by providing mental disease or
    defect evidence to explain the cause for that behavior. For example, under
    this standard, the expert in Mott could have first testified that the defendant
    had a character trait of not sensing danger (part of the excluded evidence)
    and then corroborated it with evidence of battered woman syndrome. See
    8
    STATE v. MALONE
    Opinion of the Court
    
    Mott, 187 Ariz. at 539
    –40. Although behavioral-tendency evidence is
    permissible to negate mens rea, linking that behavior to a mental disease or
    defect, whether directly or under the guise of corroboration, is
    impermissible. Cf. 
    Richter, 245 Ariz. at 9
    ¶ 36 (stating that an expert’s
    opinion cannot be used “to serve as a mere conduit for otherwise
    inadmissible testimony”). (The prosecution here did not contest that
    Malone has a character trait for impulsivity. Thus, the parties have not
    addressed whether the defense can introduce mental disease or defect
    evidence to corroborate behavioral-tendency evidence when the
    prosecution challenges the latter. We leave that issue for a future case.)
    ¶21            In sum, mental disease or defect evidence cannot be admitted
    to show that a defendant was less likely to have formed the mens rea
    element of a crime even if that evidence corroborates behavioral-tendency
    evidence. Here, the trial court correctly precluded Dr. Sullivan from
    testifying that Malone suffered from brain damage even if that impairment
    made it more likely that he had a character trait for impulsivity.
    B.
    ¶22             Although neither the parties nor the court of appeals
    challenged the oft-cited statements in Schantz and Mott that evidence of a
    mental disease or defect cannot be admitted to negate mens rea, our
    dissenting colleague does. He asserts that Schantz’s rejection of then-draft
    MPC § 4.02(1), which makes mental disease or defect evidence admissible
    if relevant to whether a defendant acted with the requisite mens rea, was
    dicta that Mott mistakenly repeated. See infra ¶¶ 32, 36. We disagree. The
    defendant in Schantz raised the issue to this Court by arguing that then-
    draft MPC § 4.02(1) supported the propriety of his requested jury
    instruction, and this Court thoroughly discussed and resolved the issue by
    declining to adopt that 
    provision. 98 Ariz. at 208
    –13; see also Town of Chino
    Valley v. City of Prescott, 
    131 Ariz. 78
    , 81 (1981) (defining dictum as “a court’s
    statement on a question not necessarily involved in the case”). And even if
    Schantz’s rejection of then-draft MPC § 4.02(1) was dicta, this Court has
    followed it in other cases, making it precedential. See, e.g., 
    Mott, 187 Ariz. at 541
    (“[T]his court considered and rejected the defense of diminished
    capacity in State v. Schantz.” (Citation omitted.)); 
    Malumphy, 105 Ariz. at 202
    (“We rejected the doctrine [of diminished responsibility] in State v. Schantz
    after an extensive discussion of the subject.” (Citation omitted.)).
    ¶23           The dissent also argues that Schantz and Mott wrongly
    conflated the issues of whether Arizona recognizes a diminished
    responsibility defense (excusing criminal acts) with whether mental disease
    9
    STATE v. MALONE
    Opinion of the Court
    or defect evidence is admissible to challenge the prosecution’s proof of
    mens rea. See infra ¶¶ 34, 38. We agree that the substantive viability of a
    diminished responsibility defense is different from the evidentiary
    admissibility of diminished responsibility evidence to refute mens rea. But
    for our purposes, this distinction is meaningless. As previously explained,
    this Court in Schantz, Mott, and other cases concluded that mental disease
    or defect evidence cannot be used to refute mens rea. See supra ¶¶ 15–17.
    ¶24            Finally, the dissent asserts that Mott incorrectly reasoned that
    the legislature’s refusal to adopt MPC § 4.02(1) evidences its rejection of that
    provision. See infra ¶ 39 (“The legislature fails to do things for many
    reasons.”). The dissent then implies that any such rejection would violate
    separation of powers as this Court is empowered by the Arizona
    Constitution to develop rules of evidence. 
    Id. This implication
    is incorrect.
    ¶25            First, legislative history reflects that the legislature considered
    and rejected the evidentiary rule set forth in MPC § 4.02(1). In 1983, the
    legislature reformed the insanity defense in the wake of two high-profile
    acquittals in murder cases. See Renée Melançon, Note, Arizona’s Insane
    Response to Insanity, 
    40 Ariz. L
    . Rev. 287, 296–97 (1998). As part of that effort,
    the Senate Judiciary Interim Subcommittee on the Insanity Defense
    recommended changes. 
    Id. at 296.
    The subcommittee identified two
    mutually exclusive approaches to improving the insanity defense,
    including the “mens rea approach,” which reflected MPC § 4.02(1):
    This approach provides that mental disease or defect does not
    constitute a separate defense to a criminal charge, but
    provides for the introduction of expert evidence on the
    defendant’s ability or inability to form the culpable mental
    state required to be convicted of the crime. Thus, the focus is
    on the question of whether or not the defendant acted with
    the requisite culpable mental state . . . .
    See Final Report of the Senate Judiciary Interim Subcommittee on the Insanity
    Defense, 13, 17 (1982) (hereinafter “Report”). The subcommittee remarked
    that this approach had been adopted in Idaho and Montana and, as noted
    in the legislative history for the Insanity Defense Reform Act of 1984, Pub.
    L. 98–473, 98 Stat. 2057 (1984) (codified as amended at 18 U.S.C. § 17), at the
    federal level.1 Report at 17. The legislature quite clearly, albeit implicitly,
    1 Idaho and Montana, unlike Arizona, currently follow the MPC § 4.02(1)
    approach. See Idaho Code § 18-207 (providing that “[m]ental condition
    10
    STATE v. MALONE
    Opinion of the Court
    rejected the mens rea approach by adopting the alternative approach
    currently set forth in § 13-502(A).
    ¶26            Second, although MPC § 4.02(1) is an evidentiary rule within
    this Court’s authority to enact, the dissent overlooks that we have declined
    to do so in the fifty-four years since Schantz. There, the Court expressed
    “hesitan[ce]” about adopting then-draft MPC § 4.02(1) without the
    legislature first adopting the entirety of MPC article 4 which, among other
    things, contained involuntary commitment provisions:
    If we accept defendant’s proposal and decide that psychiatric
    evidence of a mental disease or defect is relevant to prove that
    a defendant did not have a state of mind which is an element
    of the offense, the jury would be put to the compulsion of
    releasing upon society many dangerous criminals who
    obviously should be placed under 
    confinement. 98 Ariz. at 212
    –13. The Mott Court similarly declined to adopt MPC
    § 4.02(1) after considering legislative 
    policy. 187 Ariz. at 541
    (“Because the
    legislature has not provided for a diminished capacity defense, we have
    since consistently refused to allow psychiatric testimony to negate specific
    intent.”); see also State v. Laffoon, 
    125 Ariz. 484
    , 486 (1980) (“Since the
    legislature has not seen fit to provide for a defense of diminished
    responsibility, we have consistently declined to allow psychiatric testimony
    to negate specific intent.”).
    ¶27           Although this Court is constitutionally empowered to
    promulgate evidentiary rules, we can elect to defer to legislative policy. See
    Readenour v. Mario Power Shovel, a Div. of Dresser Indus., Inc., 
    149 Ariz. 442
    ,
    446 (1986) (“Under our constitutional rule-making power we cannot let the
    legislature define what is relevant; however, when it is appropriate we may
    defer to legislative decisions regarding the use or exclusion of relevant
    evidence to promote substantive goals of public policy such as accident
    prevention.”). For decades, this Court has deferred to perceived legislative
    shall not be a defense to any charge of criminal conduct” but “[n]othing
    herein is intended to prevent the admission of expert evidence on the issue
    of any state of mind which is an element of the offense, subject to the rules
    of evidence”); Mont. Code. Ann. § 46-14-102 (“Evidence that the defendant
    suffered from a mental disease or disorder or developmental disability is
    admissible to prove that the defendant did or did not have a state of mind
    that is an element of the offense.”).
    11
    STATE v. MALONE
    Opinion of the Court
    policy to not permit the admission of mental disease or defect evidence to
    refute mens rea. Unlike the dissent, we decline to reexamine those cases
    here when the parties have failed to brief or argue the issue, and any change
    would not result in reversible error. See, e.g., State ex rel. Brnovich v. City of
    Tucson, 
    242 Ariz. 588
    , 599 ¶ 45 (2017) (“We generally do not reach out to
    decide important constitutional issues or to upset established precedent
    when no party has raised or argued such issues.”).
    CONCLUSION
    ¶28          We vacate the court of appeals’ opinion and affirm Malone’s
    convictions and sentences.
    12
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    BALES, C.J., dissenting in part and concurring in the judgment.
    ¶29             I agree with the court of appeals that, based on our decision
    in State v. Christensen, 
    129 Ariz. 32
    (1981), and Arizona Rule of Evidence 404,
    a defendant may offer evidence of brain damage to support a claim that he
    has a character trait for impulsivity. Thus, I respectfully dissent from the
    majority’s holding that such evidence is categorically barred by our
    decisions in State v. Mott, 
    187 Ariz. 536
    (1997), and State v. Schantz, 
    98 Ariz. 200
    (1965). Because I also agree with the court of appeals that any error in
    precluding such evidence here was harmless, I concur in the judgment
    affirming Malone’s convictions and sentences.
    ¶30            Our decisions regarding the admissibility of impulsivity
    evidence are, as the court of appeals charitably noted, “nuanced.” State v.
    Malone, 
    245 Ariz. 103
    , 107 ¶ 12 (App. 2018). Our caselaw in this area is
    opaque, largely because Mott and Schantz were poorly reasoned and
    confusingly worded. We should take this opportunity to clarify the scope
    of Mott and Schantz instead of using their rickety foundation to erect a
    barrier to relevant evidence.
    ¶31            Setting aside Mott and Schantz, the evidentiary issue in this
    case would be straightforward. Rule 404(a) allows a defendant to offer
    evidence of a pertinent character trait, and since Christensen we have
    recognized that this rule allows a defendant to show that he possesses a
    trait of acting impulsively, and thus it was less likely that he acted with
    premeditation. 
    See 129 Ariz. at 34-35
    . Subject to Rules of Evidence 702
    through 705, experts - including mental health experts - may present
    evidence to support a defendant’s claim that he possesses a character trait
    for impulsivity. See State v. Leteve, 
    237 Ariz. 516
    , 524 ¶ 24 (2015). Evidence
    that a defendant has brain damage of a type that makes it more likely he
    acted impulsively is obviously relevant to whether he has the character
    trait, and would be admissible under Rules 401 (defining “relevant”
    evidence) and 402 (noting general rule of admissibility), unless it is
    precluded by other applicable law or its probative value is substantially
    outweighed by the danger of confusing the issues, misleading the jury, or
    other concerns noted in Rule 403.
    ¶32          The issue thus becomes whether Schantz or Mott bars the
    admission of proof of brain damage to support a defendant’s claim to have
    13
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    a character trait for impulsivity. Neither case decided this issue and we
    should not extend their dicta to preclude such evidence.
    ¶33            In Schantz, the defendant argued that the jury should have
    been instructed to acquit on a charge of second degree murder unless it was
    “satisfied beyond a reasonable doubt that the accused . . . was mentally
    capable of entertaining, and did entertain,” an intent to 
    kill. 98 Ariz. at 205
    n.1. Because the crime of second degree murder did not necessarily require
    proof of an intent to kill, 
    id. at 211-12,
    the defendant instead urged the Court
    to require this instruction based on the “diminished capacity defense” and
    then-draft § 4.02(1) of the Model Penal Code (MPC), which allowed the
    admission of evidence of mental disease or defect when relevant to prove
    whether the defendant had “a state of mind which is an element of the
    offense,” 
    id. at 208.
    The requested instruction would have directed an
    acquittal if the jury was convinced the defendant lacked the mental capacity
    to form an intent to kill. 
    Id. at 205
    n.1.
    ¶34            The defendant’s argument conflated two separate issues. The
    first - and the only issue presented in Schantz - was whether Arizona
    recognizes a substantive defense of diminished capacity. One version of
    that defense, as Schantz recognized, was reflected in draft MPC § 4.01(1), as
    it relieves a defendant of criminal responsibility not only if he is insane
    under the M’Naghten test, but also if he “lacks substantial capacity . . . to
    conform his conduct to the requirements of the law” due to a mental disease
    or defect. Whether to recognize such a defense, however, is distinct from
    the second issue - the admissibility of evidence of mental disease or defect
    to prove whether the defendant acted with the mental state required for the
    offense, an issue addressed in MPC § 4.02(1). See United States v. Pohlot, 
    827 F.2d 889
    , 897 (3d Cir. 1987). Unfortunately, this Court echoed the
    defendant’s confusion of these issues in its opinion in Schantz and would
    do so again in Mott.
    ¶35            Schantz recognized that the “diminished capacity” defense as
    reflected in the MPC focuses on whether “an accused lacks the capacity to
    conform his conduct to the requirements of 
    law,” 98 Ariz. at 208
    , and
    expressly held that we “do not accept § 4.01 of the [MPC] as the test for
    criminal responsibility in this 
    state,” 98 Ariz. at 210-11
    . The Court noted
    that the defendant’s proposed instruction could place the jury in “an almost
    unresolvable dilemma,” as it would instruct them to acquit if they found
    the defendant incapable of forming an intent to kill, while the court would
    14
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    otherwise instruct them that they need not find such an intent to convict.
    
    Id. at 212.
    ¶36            In dicta, the Court also rejected the defendant’s reliance on
    MPC § 4.01(2), observing that article 4 of the MPC is a “comprehensive
    scheme” and that the Court lacked constitutional authority to adopt it as
    Arizona law. 
    Id. at 212-13;
    cf. 
    id. at 216
    (McFarland and Udall, JJ., specially
    concurring) (noting discussion of MPC was unnecessary to ruling). The
    Court concluded by noting that “[i]f we accept defendant’s proposal and
    decide that psychiatric evidence of a mental disease or defect is relevant to
    prove that a defendant did not have a state of mind which is an element of
    the offense, the jury would be put to the compulsion of releasing upon
    society many dangerous criminals who obviously should be placed under
    confinement.” 
    Id. at 213.
    The “proposal” referenced in these remarks was
    the requested instruction that “permit[ed] the jury to find the defendant not
    guilty of second degree murder if he was suffering from a mental
    impairment, defect, disorder, or deficiency so as to be incapable of
    entertaining malice aforethought, the intent to kill.” 
    Id. at 207.
    ¶37          Schantz was correct as to the issue it decided - Arizona does
    not recognize a defense of “diminished responsibility” that relieves a
    defendant of criminal responsibility if a mental disease or defect renders
    him incapable of forming a mental state. Similarly, the Court was correct
    in suggesting that evidence of a mental disease or defect is not admissible
    to show a defendant lacks the capacity to form a requisite mental state, as
    allowing such evidence would be tantamount to allowing a diminished
    capacity defense. Indeed, the rejected instruction in Schantz would have
    told the jury it could consider such evidence “to negate the accused’s
    capacity to entertain the required malice aforethought, specific intent or
    knowledge.” 
    Id. at 205
    n.1 (emphasis added). Only in this respect did
    Schantz suggest that evidence of mental disease or defect is inadmissible to
    “negate” a required mental state.
    ¶38           Mott followed Schantz both in rejecting a defense of
    diminished capacity and in confusing that issue with the admissibility of
    evidence to show whether a defendant acted with a requisite mental state.
    In Mott, the Court upheld the exclusion of expert testimony regarding
    “battered woman syndrome” offered to establish that the “defendant was
    not capable of forming the requisite mental state of knowledge or 
    intent.” 187 Ariz. at 539-40
    ; see also 
    id. at 538
    (noting proffered testimony was that
    15
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    “as a battered woman, she was unable to form the requisite mental state”);
    
    id. at 540
    n.4 (noting that defendant had offered evidence “to demonstrate
    that she did not have the capacity to form the requisite mental state”); 
    id. at 543
    (noting evidence was offered to show “defendant was not capable of
    forming the specific intent required”). Mott, like Schantz, characterized
    such evidence as being offered “to negate the mens rea element of the
    crime.” 
    Id. at 540.
    Significantly, when Mott overruled State v. Gonzales, 
    140 Ariz. 349
    (1984), “to the extent it allowed evidence of a defendant’s
    diminished mental capacity as a defense to a charged crime,” the Court
    emphasized that Gonzales involved expert testimony that a defendant, as
    result of brain damage, “did not and could not have” the specific intent
    required for the 
    crime. 187 Ariz. at 544
    (quoting 
    Gonzales, 140 Ariz. at 350
    -
    51). Rejecting evidence of a mental disease or defect when offered to show
    a defendant lacks the capacity to form a requisite mental state is, as noted
    above, logically consistent with rejecting a diminished capacity defense. If
    incapacity is not a substantive defense, then evidence offered to prove
    incapacity is irrelevant and inadmissible for that purpose.
    ¶39             Mott, like Schantz, said more than was needed to resolve the
    issue before the Court, and some of its extraneous comments were unclear
    or simply wrong. Noting that Arizona’s legislature had declined to adopt
    the defense of diminished capacity as reflected in the MPC, the Court then
    observed that this action implied a decision “not to adopt” MPC § 4.02(1),
    which in turn “evidences its rejection of the use of psychological testimony
    to challenge the mens rea element of a 
    crime.” 187 Ariz. at 540
    . This passing
    observation has multiple flaws. It once again confuses recognition of the
    diminished capacity defense with the issue of admissibility. See 
    Pohlot, 827 F.2d at 897
    (noting that “[p]roperly understood, [MPC § 4.02] is therefore
    not a defense at all but merely a rule of evidence”). It also incorrectly
    suggests that rejecting the defense implies a general bar on admissibility,
    and while Mott (like Schantz) correctly recognizes that it is the legislature’s
    province to define crimes and recognize substantive defenses, these
    opinions overlook that the Arizona Constitution empowers this Court to
    develop rules of evidence. Ariz. Const. art. 6, § 5(5); see also State ex rel.
    Collins v. Seidel, 
    142 Ariz. 587
    , 590 (1984). The legislature fails to do things
    for many reasons, and its failure to adopt MPC § 4.02 does not imply that it
    intended prospectively to categorically bar certain types of evidence
    relevant to whether a defendant acted with the mental state the legislature
    has said is necessary for the commission of an offense.
    16
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    ¶40           In short, neither Schantz nor Mott addresses the admissibility
    of evidence of mental disease or defect to show that a defendant has a
    character trait for impulsivity as distinct from the use of such evidence to
    show that a defendant lacked the capacity to form a requisite mental state.
    Barring the latter does not require also barring the former. Although Mott
    contains some vague language about rejecting the use of psychological
    evidence to challenge or “negate” mens 
    rea, 187 Ariz. at 540
    , 544, these
    statements were made in the context of precluding evidence that a
    defendant lacked the capacity to form a specific intent. If those statements
    were applied more broadly, they would suggest that the expert testimony
    allowed in Christensen and Leteve should have been barred.
    ¶41             The majority does not identify good reasons for extending
    Schantz and Mott to preclude evidence of brain damage when offered to
    support a claim that the defendant has an impulsive character. Though the
    Court now recognizes that we have previously conflated a defense of
    diminished capacity with the use of mental defect evidence more broadly,
    it declines to alter course. See supra ¶¶ 22, 26. We should not infer from the
    legislature’s rejecting a defense of diminished capacity - or its not adopting
    an evidentiary rule - some implicit intent generally to preclude evidence
    relevant to whether a defendant acted with a requisite mental state.
    ¶42           If defendants can offer evidence that they have an impulsive
    character trait, there is no logical reason to categorically bar them from
    offering evidence of brain damage that is associated with such a trait.
    Excluding such evidence would be particularly unfair when the
    prosecution challenges the defendant’s claim to have an impulsive
    character. Moreover, because our understanding of the relation between
    brain physiology and behavior (including “character traits”) is incomplete
    and still evolving, instead of relying on Schantz and Mott to categorically
    bar brain damage evidence, I would trust our trial judges to decide its
    admissibility and jurors to assess its weight under our Rules of Evidence.
    ¶43           Our evidentiary rules expressly contemplate the admission of
    evidence that can be considered for some purposes but not others. Ariz. R.
    Evid. 105. Thus, concerns about jurors considering the evidence for
    purposes other than proof of a trait for impulsivity can be addressed
    through limiting instructions, and we generally presume that jurors can
    and will follow such instructions. State v. Ovante, 
    231 Ariz. 180
    , 186 ¶ 24
    (2013). If such evidence raises substantial concerns about confusing or
    misleading the jury, it may be excluded pursuant to Rule 403.
    17
    STATE v. MALONE
    CHIEF JUSTICE BALES, Dissenting in Part
    and Concurring in the Judgment
    ¶44           Although I do not support the majority’s blanket bar on brain
    damage evidence to support a claimed character trait for impulsivity, it is
    not necessary here to decide whether the evidence of Malone’s brain
    damage was properly excluded under Rule 403 or for other reasons. As
    noted by the court of appeals, any error in excluding this evidence was
    harmless, given the other admitted evidence showing that Malone had a
    character trait for impulsivity and the fact that the State did not challenge
    this evidence or the existence of the character trait. Accordingly, I concur
    in the Court’s judgment.
    18