Gerald Pizzuto, Jr. v. Randy Blades ( 2019 )


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  •                FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    GERALD ROSS PIZZUTO, JR.,               No. 16-36082
    Petitioner-Appellant,
    D.C. No.
    v.                      1:05-cv-00516-
    BLW
    RANDY BLADES, Warden, Idaho
    Maximum Security Institution,
    Respondent-Appellee.          OPINION
    Appeal from the United States District Court
    for the District of Idaho
    B. Lynn Winmill, Chief District Judge, Presiding
    Argued and Submitted December 11, 2018
    San Francisco, California
    Filed August 14, 2019
    Before: Raymond C. Fisher, Ronald M. Gould
    and Johnnie B. Rawlinson, Circuit Judges.
    Per Curiam Opinion
    2                       PIZZUTO V. BLADES
    SUMMARY*
    Habeas Corpus /Death Penalty
    The panel affirmed the district court’s denial of Gerald
    Ross Pizzuto, Jr.’s successive habeas corpus petition in which
    Pizzuto challenged, based on Atkins v. Virginia, 
    536 U.S. 304
    (2002), the Idaho Supreme Court’s 2008 decision that his
    execution is not barred under an Idaho law prohibiting the
    execution of intellectually disabled offenders.
    Applying 28 U.S.C. § 2254(d)(1), the panel held that the
    record does not establish that the Idaho Supreme Court’s
    decision was contrary to or involved an unreasonable
    application of United States Supreme Court precedent. The
    panel wrote that although the state court’s decision was
    contrary to clinical standards in place at the time, it was not
    obvious at that time that strict adherence to the clinical
    standards was required. The panel also wrote that although
    the state court’s requirement of an IQ of 70 or below is
    contrary to Hall v. Florida, 
    572 U.S. 701
    (2014); Brumfield
    v. Cain, 
    135 S. Ct. 2269
    (2015); and Moore v. Texas, 
    137 S. Ct. 1039
    (2017), these decisions all postdated the state
    court’s decision, and it was not obvious under Atkins alone
    that, for Eighth Amendment purposes, an individual with an
    IQ test score between 70 and 75 or lower may show
    intellectual disability by presenting additional evidence
    regarding difficulties in adaptive functioning.
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    PIZZUTO V. BLADES                       3
    Applying 28 U.S.C. § 2254(d)(2), the panel held that the
    record does not establish that the Idaho Supreme Court’s
    decision was based on an unreasonable determination of the
    facts in light of the evidence presented in the state court
    proceeding. The panel rejected Pizzuto’s contention that the
    state court’s factual determinations are unreasonable merely
    because the state court did not apply the clinical definitions
    of intellectual disability. The panel rejected Pizzuto’s
    contention that the state court unreasonably failed to consider
    his school records as evidence of subaverage intellectual
    functioning. The panel rejected Pizzuto’s argument that the
    state court unreasonably determined that his IQ could have
    declined in adulthood due to drug abuse and epilepsy.
    Regarding Pizzuto’s argument that the state court’s denial of
    an evidentiary hearing was based on an unreasonable
    determination of the facts, the panel wrote that the Idaho
    Supreme Court never addressed the question of whether
    Pizzuto raised a reasonable doubt regarding his intellectual
    capacity, and that the Idaho Supreme Court’s failure to apply
    a “reasonable doubt” standard was not contrary to or an
    unreasonable application of Atkins. The panel wrote that
    under the circumstances, the denial of an evidentiary hearing
    did not render the state court’s factfinding process
    unreasonable under § 2254(d)(2)’s highly deferential
    standard.
    Because 28 U.S.C. § 2254(d) is not satisfied, the panel
    held that the district court properly denied habeas relief. The
    panel did not need to address Pizzuto’s remaining appellate
    arguments or review his Atkins claim de novo. Accordingly,
    the panel did not address whether Pizzuto is intellectually
    disabled or whether his execution would violate the Eighth
    Amendment. The panel wrote that its decision does not
    4                       PIZZUTO V. BLADES
    preclude the Idaho courts from reconsidering those questions
    in light of intervening events.
    COUNSEL
    Joan M. Fisher (argued), Assistant Federal Defender; Heather
    E. Williams, Federal Defender; Office of the Federal Public
    Defender, Sacramento, California; for Petitioner-Appellant.
    L. LaMont Anderson (argued), Chief, Capital Litigation Unit;
    Lawrence G. Wasden, Attorney General; Criminal Law
    Division, Office of the Attorney General, Boise, Idaho; for
    Respondent-Appellee.
    OPINION
    PER CURIAM:
    Gerald Ross Pizzuto, Jr., appeals the district court’s denial
    of his successive petition for a writ of habeas corpus, in
    which he sought relief based on the United States Supreme
    Court’s decision in Atkins v. Virginia, 
    536 U.S. 304
    (2002).
    In Atkins, the Supreme Court held that the Eighth
    Amendment prohibits the execution of intellectually disabled
    persons.1 In response to Atkins, Idaho enacted a law
    prohibiting the execution of intellectually disabled offenders.
    See Idaho Code § 19-2515A. Pizzuto challenges the Idaho
    Supreme Court’s decision that his execution is not barred
    1
    We use the current clinical terms, intellectually disabled and
    intellectual disability, except when quoting from sources using the former
    terms, mentally retarded and mental retardation.
    PIZZUTO V. BLADES                        5
    under that state law. See Pizzuto v. State (Pizzuto I), 
    202 P.3d 642
    (Idaho 2008). We have jurisdiction under 28 U.S.C.
    §§ 1291 and 2253, and we affirm the district court’s denial of
    Pizzuto’s petition. Because the record does not establish that
    the state court’s adjudication of Pizzuto’s Atkins claim
    resulted in a decision that “was contrary to, or involved an
    unreasonable application of, clearly established Federal law,
    as determined by the Supreme Court of the United States,” or
    “was based on an unreasonable determination of the facts in
    light of the evidence presented in the State court proceeding,”
    habeas relief may not be granted. See 28 U.S.C. § 2254(d).
    Because habeas relief is barred under § 2254(d), we do not
    address whether Pizzuto is intellectually disabled, nor
    whether his execution would violate the Eighth Amendment.
    BACKGROUND
    In 1986, a state trial court judge sentenced Pizzuto to
    death for the murders of Berta Herndon and her nephew Del
    Herndon. See Pizzuto 
    I, 202 P.3d at 645
    . The Idaho Supreme
    Court summarized the murders as follows:
    Pizzuto approached [the Herndons] with a .22
    caliber rifle as they arrived at their mountain
    cabin and made them enter the cabin. While
    inside, he tied the Her[n]dons’ wrists behind
    their backs and bound their legs in order to
    steal their money. Some time later, he
    bludgeoned Berta Herndon to death with
    hammer blows to her head and killed Del
    Herndon by bludgeoning him in the head with
    a hammer and shooting him between the eyes.
    Pizzuto murdered the Her[n]dons just for the
    6                    PIZZUTO V. BLADES
    sake of killing and subsequently joked and
    bragged about the killings to his associates.
    
    Id. Sixteen years
    later, the Supreme Court decided Atkins,
    holding that executions of intellectually disabled persons
    constitute “cruel and unusual punishments” prohibited by the
    Eighth Amendment to the United States Constitution. See
    U.S. Const. amend. VIII. Citing “powerful evidence that
    today our society views mentally retarded offenders as
    categorically less culpable than the average criminal,” the
    Court concluded that “a national consensus has developed
    against” such executions. 
    Atkins, 536 U.S. at 316
    .
    The Court, however, did not adopt any single definition
    of intellectual disability. It noted that states’ “statutory
    definitions of mental retardation [we]re not identical, but
    generally conform[ed] to the clinical definitions set forth” by
    the American Association on Mental Retardation (AAMR)
    and the American Psychiatric Association. See 
    id. at 317
    n.22. At the time, the AAMR – now known as the American
    Association on Intellectual and Developmental Disabilities
    (AAIDD) – defined intellectual disability as follows:
    Mental retardation refers to substantial
    limitations in present functioning. It is
    characterized by significantly subaverage
    intellectual functioning, existing concurrently
    with related limitations in two or more of the
    following applicable adaptive skill areas:
    communication, self-care, home living, social
    skills, community use, self-direction, health
    and safety, functional academics, leisure, and
    PIZZUTO V. BLADES                         7
    work. Mental retardation manifests before age
    18.
    
    Id. at 308
    n.3 (quoting AAMR, Mental Retardation:
    Definition, Classification, and Systems of Supports 5 (9th ed.
    1992)). The American Psychiatric Association’s definition
    was similar:
    The essential feature of Mental Retardation is
    significantly subaverage general intellectual
    functioning (Criterion A) that is accompanied
    by significant limitations in adaptive
    functioning in at least two of the following
    skill areas: communication, self-care, home
    living, social/interpersonal skills, use of
    community resources, self-direction,
    functional academic skills, work, leisure,
    health, and safety (Criterion B). The onset
    must occur before age 18 years (Criterion C).
    Mental Retardation has many different
    etiologies and may be seen as a final common
    pathway of various pathological processes
    that affect the functioning of the central
    nervous system.
    
    Id. (quoting American
    Psychiatric Association, Diagnostic
    and Statistical Manual of Mental Disorders 41 (4th ed. 2000)
    (DSM-IV)). The Court noted that “an IQ between 70 and 75
    or lower . . . is typically considered the cutoff IQ score for the
    intellectual function prong of the mental retardation
    definition,” 
    id. at 309
    n.5, and that “‘[m]ild’ mental
    retardation is typically used to describe people with an IQ
    level of 50–55 to approximately 70,” 
    id. at 308
    n.3 (quoting
    DSM-IV at 42–43).
    8                    PIZZUTO V. BLADES
    Atkins, however, did not expressly adopt these clinical
    definitions of intellectual disability. The Court instead left
    that question to the states:
    To the extent there is serious disagreement
    about the execution of mentally retarded
    offenders, it is in determining which offenders
    are in fact retarded. In this case, for instance,
    the Commonwealth of Virginia disputes that
    Atkins suffers from mental retardation. Not
    all people who claim to be mentally retarded
    will be so impaired as to fall within the range
    of mentally retarded offenders about whom
    there is a national consensus. As was our
    approach in Ford v. Wainwright, 
    477 U.S. 399
            (1986), with regard to insanity, “we leave to
    the State[s] the task of developing appropriate
    ways to enforce the constitutional restriction
    upon [their] execution of sentences.” 
    Id., at 405,
    416–417.
    
    Id. at 317
    (alterations in original).
    Shortly after the Atkins decision, Idaho adopted a statute
    prohibiting imposition of the death penalty for intellectually
    disabled offenders. See 2003 Idaho Sess. Laws 399 (codified
    at Idaho Code § 19-2515A(3)). The statute defines
    intellectual disability as follows:
    (a) “Mentally retarded” means significantly
    subaverage general intellectual functioning
    that is accompanied by significant limitations
    in adaptive functioning in at least two (2) of
    the following skill areas: communication,
    PIZZUTO V. BLADES                        9
    self-care, home living, social or interpersonal
    skills, use of community resources, self-
    direction, functional academic skills, work,
    leisure, health and safety. The onset of
    significant subaverage general intelligence
    functioning and significant limitations in
    adaptive functioning must occur before age
    eighteen (18) years.
    (b) “Significantly subaverage general
    intellectual functioning” means an
    intelligence quotient of seventy (70) or below.
    
    Id. at 398
    (codified at Idaho Code § 19-2515A(1)).
    In light of Atkins, Pizzuto filed a fifth petition for state
    post-conviction relief, challenging his death sentence on the
    ground that he was intellectually disabled. See Pizzuto 
    I, 202 P.3d at 645
    . In July 2003, the state moved to summarily
    dismiss Pizzuto’s petition. See 
    id. at 646.
    In August 2003,
    Pizzuto moved to disqualify the state trial court judge. See 
    id. In October
    2004, Pizzuto moved for additional psychological
    testing, asking that he be transported to an appropriate
    medical facility for testing in connection with a
    neuropsychiatric evaluation by Dr. James R. Merikangas.
    Pizzuto did not notice the motion for a hearing, however. See
    10                       PIZZUTO V. BLADES
    
    id. at 655.2
    In January 2005, the state trial court denied the
    motion for disqualification. See 
    id. at 646.
    In seeking dismissal of Pizzuto’s petition, the state argued
    that the petition was untimely under Idaho law and,
    alternatively, that Pizzuto had failed to establish a prima face
    case of intellectual disability under the new Idaho statute.3
    With respect to the latter contention, the state noted that there
    were three elements of intellectual disability – subaverage
    intellectual functioning, significant limitation in adaptive
    functioning and an onset before age 18. With respect to the
    first criterion, the state noted that Pizzuto had “a verbal IQ of
    72” – based on an IQ test administered by Dr. Michael Emery
    in 1985 – but that “[t]he Statute says 70 or below,” and “72
    is not 70 or below.” In addition, because Pizzuto’s IQ score
    of 72 was obtained when he was 28 years old, the state
    argued that “we have no indication of what his IQ was – no
    testing, at least – what his IQ . . . was before his 18th
    birthday.” The state noted that the court had “no evidence of
    an IQ test prior to age 18.”
    2
    It is not clear why Pizzuto did not notice the motion for a hearing.
    At an April 2005 hearing, “Pizzuto’s counsel stated that she could not ask
    the district court to rule on her motion for testing, apparently because she
    believed the judge should be disqualified from presiding in the case and
    therefore from ruling on the motion.” Pizzuto 
    I, 202 P.3d at 655
    & n.8.
    Counsel for Pizzuto apparently concluded that, because the court had
    erroneously denied the motion to disqualify, any order entered by the court
    on the question of testing would be void.
    3
    Initially, the state also argued for summary dismissal on the ground
    that, as a matter of state law, Atkins did not apply retroactively. See
    Pizzuto 
    I, 202 P.3d at 646
    . The state subsequently abandoned that
    argument, however.
    PIZZUTO V. BLADES                       11
    Pizzuto both opposed the state’s motion for summary
    dismissal and, in September 2005, moved for summary
    judgment, arguing that he had, as a matter of law, established
    a prima facie case of intellectual disability. See 
    id. Pizzuto argued
    that the state trial court should deny the state’s motion
    for summary dismissal and grant his motion for summary
    judgment. In the alternative, Pizzuto argued that his October
    2004 motion for additional testing should be granted and the
    matter set for trial. See 
    id. at 655–56
    & n.9.
    In addressing whether Pizzuto had made a prima facie
    showing of intellectual disability under the Idaho statute, both
    sides recognized that Idaho’s requirement of an IQ of 70 or
    below was inconsistent with the AAMR and American
    Psychiatric Association clinical standards in effect at the
    time. Counsel for Pizzuto, however, acknowledged that
    Atkins did not “dictate what retardation is,” while counsel for
    the state emphasized that “[t]he United States Supreme Court
    said that the states were permitted to define mental
    retardation . . . basically as they saw fit.” The state
    recognized that the DSM and AAMR manual “talk[ed] about
    . . . a 70 IQ plus or minus five,” but the state emphasized that
    “the Idaho Statute doesn’t say that. [Section] 19-2515A is
    very specific, 70 or below. It doesn’t say plus or minus five.
    Seventy or below, period, end of story.” The state observed
    that “some states have actually gone below the 70 and one
    state . . . has gone to 75.” But “Idaho chose 70.”
    The state argued, moreover, that the margin of error was
    of no use to Pizzuto, because his “actual” IQ was as likely to
    be 77 as 67:
    [Section] 2515A says that if the Court finds
    by a preponderance of the evidence that the
    12                   PIZZUTO V. BLADES
    defendant is mentally retarded –
    preponderance of the evidence, more likely
    than not, . . . something over 50 percent.
    Well, isn’t it just as likely that Pizzuto’s IQ is
    77 as opposed to 67?               That’s not a
    preponderance of the evidence. So, you have
    to go with the 72 and that’s the only number
    that this Court has before it, the only number.
    In December 2005, after a hearing on the motions, the
    state trial court dismissed Pizzuto’s petition on the grounds
    that it had not been timely filed under state law and that
    Pizzuto had failed to raise a genuine issue of material fact
    supporting his claim of intellectual disability. See 
    id. at 646.
    Pizzuto timely appealed to the Idaho Supreme Court. See 
    id. In a
    2008 decision, the Idaho Supreme Court affirmed the
    state trial court’s denial of Pizzuto’s Atkins claim. See
    Pizzuto I, 
    202 P.3d 642
    . The court noted that, to survive
    summary dismissal, Pizzuto had to present evidence
    establishing a prima facie case – i.e., enough evidence to
    allow the factfinder to infer the fact at issue and rule in his
    favor – on each element of his claim under § 19-2515A(1).
    See 
    id. at 650.
    The court interpreted the Idaho statute as
    requiring proof of three elements: “(1) an intelligence
    quotient (IQ) of 70 or below; (2) significant limitations in
    adaptive functioning in at least two of the ten areas listed; and
    (3) the onset of the offender’s IQ of 70 or below and the onset
    of his or her significant limitations in adaptive functioning
    both must have occurred before the offender turned age
    eighteen.” 
    Id. at 651.
    The court concluded that Pizzuto failed to establish a
    prima facie case as to the first element – an IQ of 70 or
    PIZZUTO V. BLADES                                13
    below. The record reflected only a single IQ test score for
    Pizzuto, a score of 72 on the test administered by Dr. Emery
    in December 1985, shortly before Pizzuto’s 29th birthday.
    See 
    id. The court
    acknowledged Pizzuto’s argument that “an
    IQ score is only accurate within five points,” but it found
    “two problems” with Pizzuto’s argument that “his actual IQ
    could have been five points lower or higher than 72”: first, it
    would be just as reasonable for the state trial court to infer
    that his actual IQ was 77 as it would be to infer that it was 67;
    second, the state trial court was permitted to infer that his IQ
    had decreased during the 11 years between his 18th birthday
    and the date of his IQ test. Id.4
    4
    The Idaho Supreme Court noted that the state trial court was
    permitted to draw inferences in favor of the state when considering
    whether to grant summary judgment to the state. See Pizzuto 
    I, 202 P.3d at 650
    (citing Shawver v. Huckleberry Estates, L.L.C., 
    93 P.3d 685
    ,
    691–92 (Idaho 2004)). It is not clear whether this line of authority – see,
    e.g., Stafford v. Klosterman, 
    998 P.2d 1118
    , 1119 (Idaho 2000); E. Idaho
    Agr. Credit Ass’n v. Neibaur, 
    944 P.2d 1386
    , 1389 (Idaho 1997); Wells v.
    Williamson, 
    794 P.2d 626
    , 629 (Idaho 1990); Riverside Dev. Co. v.
    Ritchie, 
    650 P.2d 657
    , 661 (Idaho 1982) – applies where, as here, the
    nonmoving party has made clear that it does not consider the record fully
    developed. See Pizzuto 
    I, 202 P.3d at 656
    n.9; cf. 10A Charles Alan
    Wright et al., Federal Practice and Procedure § 2720 (4th ed. 2019)
    (describing, in the text accompanying note 15, the comparable practice
    under federal procedure); Int’l Bancorp, LLC v. Societe des Bains de Mer
    et du Cercle des Etrangers a Monaco, 
    329 F.3d 359
    , 362 (4th Cir. 2003);
    Matter of Placid Oil Co., 
    932 F.2d 394
    , 398 (5th Cir. 1991); Fox v.
    Johnson & Wimsatt, 
    127 F.2d 729
    , 737 (D.C. Cir. 1942). It also is not
    clear whether the state trial court in fact drew inferences in favor of the
    state; the state trial court’s ruling says only that “Pizzuto failed to raise a
    genuine issue of material fact supporting his claim of mental retardation.”
    Pizzuto, however, does not raise these questions in his opening brief, and
    so we do not address them.
    14                   PIZZUTO V. BLADES
    The court noted that Pizzuto “did not offer any expert
    opinion” showing that he “had an IQ of 70 or below at the
    time of the murders and prior to his eighteenth birthday.” 
    Id. at 655.
    Accordingly, the court held that the trial court did not
    err in granting summary judgment to the state. See 
    id. We granted
    Pizzuto permission to file a successive federal
    habeas petition on his Atkins claim. After additional testing
    and an evidentiary hearing, the federal district court denied
    Pizzuto’s petition. See Pizzuto v. Blades (Pizzuto II), No.
    1:05-CV-516-BLW, 
    2012 WL 73236
    , at *21 (D. Idaho Jan.
    10, 2012). We initially affirmed. See Pizzuto v. Blades
    (Pizzuto III), 
    729 F.3d 1211
    , 1224 (9th Cir. 2013).
    While Pizzuto’s petition for rehearing was pending,
    however, the Supreme Court decided Hall v. Florida,
    
    572 U.S. 701
    (2014). In Hall, the Supreme Court considered
    a Florida law defining intellectual disability “to require an IQ
    test score of 70 or less. If, from test scores, a prisoner is
    deemed to have an IQ above 70, all further exploration of
    intellectual disability is foreclosed.” 
    Id. at 704.
    The Court
    held that “[t]his rigid rule . . . creates an unacceptable risk
    that persons with intellectual disability will be executed, and
    thus is unconstitutional.” 
    Id. At the
    outset, the Court held that, “[i]n determining who
    qualifies as intellectually disabled, it is proper to consult the
    medical community’s opinions.” 
    Id. at 710.
    The Court
    explained that “[t]he legal determination of intellectual
    disability is distinct from a medical diagnosis, but it is
    informed by the medical community’s diagnostic
    framework.” 
    Id. at 721.
                             PIZZUTO V. BLADES                              15
    Next, once again turning to the clinical definitions
    established by the AAMR and the American Psychiatric
    Association, the Court explained that “the medical
    community defines intellectual disability according to three
    criteria: significantly subaverage intellectual functioning,
    deficits in adaptive functioning (the inability to learn basic
    skills and adjust behavior to changing circumstances), and
    onset of these deficits during the developmental period.” 
    Id. at 710
    (citing American Psychiatric Association, Diagnostic
    and Statistical Manual of Mental Disorders 33 (5th ed. 2013)
    (DSM-5)).
    With respect to the first criterion, the Court recognized
    that IQ test scores may be “of considerable significance.” 
    Id. at 723.
    The Court emphasized, however, that, “in using these
    scores to assess a defendant’s eligibility for the death penalty,
    a State must afford these test scores the same studied
    skepticism that those who design and use the tests do, and
    understand that an IQ test score represents a range rather than
    a fixed number.” 
    Id. Because “[e]ach
    IQ test has a ‘standard
    error of measurement’” of plus or minus five points, “an
    individual’s intellectual functioning cannot be reduced to a
    single numerical score.” 
    Id. at 713.
    Thus, “IQ test scores
    should be read not as a single fixed number but as a range.”
    
    Id. at 712.
    “A score of 71, for instance, is generally
    considered to reflect a range between 66 and 76 . . . .” 
    Id. at 713.
    5
    5
    Although the standard error of measurement applicable here, as in
    Hall, is plus or minus five points, that is not always the case. See AAIDD,
    Intellectual Disability: Definition, Classification, and Systems of Supports
    36 (11th ed. 2010) (AAIDD-11) (noting that the standard error of
    measurement “varies by test, subgroup, and age group . . . . For well-
    standardized measures of general intellectual functioning, the standard
    error of measurement is approximately 3 to 5 points.”).
    16                         PIZZUTO V. BLADES
    A court, therefore, may not cut off the inquiry when a
    defendant scores between 70 and 75 on an IQ test. Rather,
    “[f]or professionals to diagnose – and for the law then to
    determine – whether an intellectual disability exists once the
    [standard error of measurement] applies and the individual’s
    IQ score is 75 or below the inquiry would consider factors
    indicating whether the person had deficits in adaptive
    functioning.” 
    Id. at 714.
    The Court “agree[d] with the
    medical experts that when a defendant’s IQ test score falls
    within the test’s acknowledged and inherent margin of error,
    the defendant must be able to present additional evidence of
    intellectual disability, including testimony regarding adaptive
    deficits.” 
    Id. at 723.
    6
    The Court held that Florida’s “strict IQ test score cutoff
    of 70” ran afoul of these requirements in two ways. First, it
    6
    As the DSM-5 explains:
    Individuals with intellectual disability have scores of
    approximately two standard deviations or more below
    the population mean, including a margin for
    measurement error (generally +5 points). On tests with
    a standard deviation of 15 and a mean of 100, this
    involves a score of 65–75 (70 ± 5). . . . IQ test scores
    are approximations of conceptual functioning but may
    be insufficient to assess reasoning in real-life situations
    and mastery of practical tasks. For example, a person
    with an IQ score above 70 may have such severe
    adaptive behavior problems in social judgment, social
    understanding, and other areas of adaptive functioning
    that the person’s actual functioning is comparable to
    that of individuals with a lower IQ score. Thus, clinical
    judgment is needed in interpreting the results of IQ
    tests.
    DSM-5 at 37.
    PIZZUTO V. BLADES                        17
    “disregard[ed] established medical practice” by “tak[ing] an
    IQ score as final and conclusive evidence of a defendant’s
    intellectual capacity, when experts in the field would consider
    other evidence.” 
    Id. at 712.
    Second, it “relie[d] on a
    purportedly scientific measurement of the defendant’s
    abilities, his IQ score, while refusing to recognize that the
    score is, on its own terms, imprecise.” 
    Id. In reaching
    this conclusion, the Court rejected any
    suggestion that Atkins had given states “unfettered discretion
    to define” intellectual disability. 
    Id. at 719.
    The Court said
    that “[t]he clinical definitions of intellectual disability, which
    take into account that IQ scores represent a range, not a fixed
    number, were a fundamental premise of Atkins.” 
    Id. at 720.
    The Court added:
    If the States were to have complete autonomy
    to define intellectual disability as they wished,
    the Court’s decision in Atkins could become a
    nullity, and the Eighth Amendment’s
    protection of human dignity would not
    become a reality. This Court thus reads
    Atkins to provide substantial guidance on the
    definition of intellectual disability.
    
    Id. at 720–21.
    Finally, in conducting a survey of state laws respecting
    the execution of intellectually disabled offenders, Hall briefly
    distinguished Idaho law from Florida’s strict IQ test score
    cutoff. Citing the Idaho Supreme Court’s decision in
    Pizzuto’s case, the Court characterized Idaho law as
    “allowing a defendant to present additional evidence of
    18                       PIZZUTO V. BLADES
    intellectual disability even when an IQ test score is above
    70.” 
    Id. at 717
    (citing Pizzuto 
    I, 202 P.3d at 651
    ).7
    In light of Hall, we withdrew our opinion, vacated the
    judgment of the district court and remanded this case to the
    district court. See Pizzuto v. Blades (Pizzuto IV), 
    758 F.3d 1178
    (9th Cir. 2014).
    On remand, the district court concluded that Hall did not
    alter its previous decision. See Pizzuto v. Blades (Pizzuto V),
    No. 1:05-cv-00516-BLW, 
    2016 WL 6963030
    , at *11 (D.
    Idaho Nov. 28, 2016). The court reasoned that relief was not
    available under § 2254(d)(1), because Hall was not clearly
    established law at the time of the state court decision and,
    even if it were, the state court’s alternative basis for denying
    relief was reasonable. See 
    id. at *6–10.
    The court also
    incorporated its previous conclusion that the state court’s
    decision was not based on an unreasonable determination of
    7
    Idaho’s IQ requirement is less restrictive than the Florida
    requirement at issue in Hall because, whereas Florida required an IQ test
    score of 70, Idaho requires an “actual IQ” of 70. See Pizzuto 
    I, 202 P.3d at 651
    . Under the Florida rule, an individual with an IQ test score of 71
    is altogether barred from establishing intellectual disability. Under the
    Idaho rule adopted in Pizzuto’s case, that individual could establish
    subaverage intellectual functioning if he could somehow show that his IQ
    test score overstated his “actual IQ.” Ultimately, however, requiring an
    individual to establish an “actual IQ” of 70 in order to satisfy the
    intellectual functioning prong of the intellectual disability definition
    suffers from a similar infirmity as the Florida rule – it fails to recognize
    that “an IQ between 70 and 75 or lower . . . is typically considered the
    cutoff IQ score for the intellectual function prong of the mental retardation
    definition,” 
    Atkins, 536 U.S. at 309
    n.5, and it fails to recognize that,
    “when the lower end of [an IQ] score range falls at or below 70, [a court
    must] move on to consider [the individual’s] adaptive functioning,” Moore
    v. Texas, 
    137 S. Ct. 1039
    , 1049 (2017).
    PIZZUTO V. BLADES                       19
    the facts under § 2254(d)(2). See 
    id. at *10.
    Finally, after
    reviewing the evidence again on remand, the district court
    concluded that Pizzuto was not entitled to relief even under
    de novo review. See 
    id. at *10–11.
    This timely appeal
    followed.
    In briefing this appeal, the parties have discussed not only
    Atkins and Hall but also the Supreme Court’s more recent
    decisions in Brumfield v. Cain, 
    135 S. Ct. 2269
    (2015), and
    Moore v. Texas (Moore I), 
    137 S. Ct. 1039
    (2017). In
    Brumfield, the Court reiterated that “an IQ test result cannot
    be assessed in a vacuum” and again held, as in Hall, that “it
    is unconstitutional to foreclose ‘all further exploration of
    intellectual disability’ simply because a capital defendant is
    deemed to have an IQ above 
    70.” 135 S. Ct. at 2277
    –78
    (quoting 
    Hall, 572 U.S. at 704
    ). The Court also concluded
    that the state court’s rejection of the petitioner’s request for
    an evidentiary hearing on his Atkins claim was based on an
    “unreasonable determination of the facts” under § 2254(d)(2).
    See 
    id. at 2276.
    In Moore I, the Court reaffirmed Hall’s holding that
    “adjudications of intellectual disability should be ‘informed
    by the views of medical 
    experts.’” 137 S. Ct. at 1044
    (quoting 
    Hall, 572 U.S. at 721
    ). The Court explained:
    Even if “the views of medical experts” do not
    “dictate” a court’s intellectual-disability
    determination, . . . the determination must be
    “informed by the medical community’s
    diagnostic framework.” . . . . Hall indicated
    that being informed by the medical
    community does not demand adherence to
    everything stated in the latest medical guide.
    20                   PIZZUTO V. BLADES
    But neither does our precedent license
    disregard of current medical standards.
    
    Id. at 1048–49
    (citations omitted) (quoting 
    Hall, 572 U.S. at 721
    ). Thus, the Court held that “[t]he medical
    community’s current standards supply one constraint on
    States’ leeway in this area.” 
    Id. at 1053.
    Moore I also reaffirmed Hall’s holding that courts must
    “continue the inquiry and consider other evidence of
    intellectual disability where an individual’s IQ score, adjusted
    for the test’s standard error, falls within the clinically
    established range for intellectual-functioning deficits.” 
    Id. at 1050.
    In Moore I, the petitioner’s average score on six IQ
    tests was 70.66. See 
    id. at 1045.
    Thus, the Court held that,
    “[b]ecause the lower end of Moore’s score range falls at or
    below 70, the [state court] had to move on to consider
    Moore’s adaptive functioning.” 
    Id. at 1049
    (citing 
    Hall, 572 U.S. at 723
    ).
    After briefing for this appeal was completed, the Supreme
    Court has twice more reviewed Atkins claims. In Shoop v.
    Hill, 
    139 S. Ct. 504
    (2019) (per curiam), the Court
    “consider[ed] what was clearly established regarding the
    execution of the intellectually disabled in 
    2008.” 139 S. Ct. at 506
    –07. The Court observed that “Atkins gave no
    comprehensive definition of ‘mental retardation’ for Eighth
    Amendment purposes”; although Atkins cited the definitions
    of intellectual disability adopted by the AAMR and the
    American Psychiatric Association approvingly, it “left ‘to the
    State[s] the task of developing appropriate ways to enforce
    the constitutional restriction’” on executing intellectually
    disabled persons. 
    Id. at 507
    (alteration in original) (quoting
    
    Atkins, 536 U.S. at 317
    ).
    PIZZUTO V. BLADES                      21
    In the second case, Moore v. Texas (Moore II), 
    139 S. Ct. 666
    (2019) (per curiam), the Court reaffirmed its holding in
    Moore I that the petitioner, with an average IQ score of 70.66,
    “had demonstrated sufficient intellectual-functioning deficits”
    under the first criterion of the clinical definition of
    intellectual disability “to require consideration of the second
    criterion – adaptive functioning.” 
    Id. at 668
    (citing Moore 
    I, 137 S. Ct. at 1048
    –50).
    STANDARD OF REVIEW
    We review de novo the district court’s denial of a habeas
    petition. See Curiel v. Miller, 
    830 F.3d 864
    , 868 (9th Cir.
    2016). Review of Pizzuto’s petition is governed by the
    Antiterrorism and Effective Death Penalty Act of 1996
    (AEDPA) because Pizzuto filed his petition after April 24,
    1996. See Lindh v. Murphy, 
    521 U.S. 320
    , 322, 336 (1997).
    Under AEDPA, habeas relief can be granted only if the state
    court proceeding adjudicating the claim on the merits
    “resulted in a decision that was contrary to, or involved an
    unreasonable application of, clearly established Federal law,
    as determined by the Supreme Court of the United States,”
    28 U.S.C. § 2254(d)(1), or “was based on an unreasonable
    determination of the facts in light of the evidence presented
    in the State court proceeding,” 
    id. § 2254(d)(2).
    “[A] decision by a state court is ‘contrary to’ [the
    Supreme Court’s] clearly established law if it ‘applies a rule
    that contradicts the governing law set forth in [the Supreme
    Court’s] cases’ or if it ‘confronts a set of facts that are
    materially indistinguishable from a decision of th[e Supreme]
    Court and nevertheless arrives at a result different from [the
    Supreme Court’s] precedent.’” Price v. Vincent, 
    538 U.S. 634
    , 640 (2003) (quoting Williams v. Taylor, 
    529 U.S. 362
    ,
    22                   PIZZUTO V. BLADES
    405–06 (2000)). “[A] state-court decision involves an
    unreasonable application of th[e Supreme] Court’s precedent
    if the state court identifies the correct governing legal rule
    from th[e Supreme] Court’s cases but unreasonably applies it
    to the facts of the particular state prisoner’s case.” 
    Williams, 529 U.S. at 407
    . To satisfy this requirement, the record
    “must show that the state court’s ruling . . . was so lacking in
    justification that there was an error well understood and
    comprehended in existing law beyond any possibility for
    fairminded disagreement.” Harrington v. Richter, 
    562 U.S. 86
    , 103 (2011). The question “is not whether a federal court
    believes the state court’s determination was incorrect but
    whether that determination was unreasonable – a substantially
    higher threshold.” Schriro v. Landrigan, 
    550 U.S. 465
    , 473
    (2007) (citing 
    Williams, 529 U.S. at 410
    ). Turning to
    § 2254(d)(2), “we may only hold that a state court’s decision
    was based on an unreasonable determination of the facts if
    ‘we [are] convinced that an appellate panel, applying the
    normal standards of appellate review, could not reasonably
    conclude that the finding is supported by the record.’”
    Murray v. Schriro, 
    745 F.3d 984
    , 999 (9th Cir. 2014)
    (alteration in original) (quoting Taylor v. Maddox, 
    366 F.3d 992
    , 1000 (9th Cir. 2004), abrogated on other grounds as
    stated in 
    Murray, 745 F.3d at 1000
    ).
    We apply our review under § 2254(d) to the last reasoned
    state court decision. See Ylst v. Nunnemaker, 
    501 U.S. 797
    ,
    803–04 (1991); Hibbler v. Benedetti, 
    693 F.3d 1140
    , 1146
    (9th Cir. 2012). Here, we review the Idaho Supreme Court’s
    2008 decision. See Pizzuto I, 
    202 P.3d 642
    . Because that
    court denied Pizzuto’s Atkins claim on the merits, our review
    under § 2254(d) is limited to the record that was before the
    state court. See Cullen v. Pinholster, 
    563 U.S. 170
    , 181
    (2011). We may grant habeas relief only if we conclude both
    PIZZUTO V. BLADES                            23
    that § 2254(d) is satisfied and, on de novo review, that the
    petitioner is in custody in violation of the Constitution of the
    United States. See Frantz v. Hazey, 
    533 F.3d 724
    , 735–37
    (9th Cir. 2008) (en banc).8
    DISCUSSION
    Pizzuto invokes both prongs of § 2254(d). He contends
    that the Idaho Supreme Court’s decision was “contrary to” or
    involved an “unreasonable application” of Supreme Court
    precedent. See 28 U.S.C. § 2254(d)(1). Alternatively, he
    contends that the state court’s decision was “based on an
    unreasonable determination of the facts.”          See 
    id. § 2254(d)(2).
    We consider these contentions in turn.
    A. Section 2254(d)(1)
    We begin by addressing Pizzuto’s argument that the Idaho
    Supreme Court’s decision was “contrary to” or involved an
    “unreasonable application” of clearly established Supreme
    Court precedent under § 2254(d)(1).
    After the Atkins decision, the Idaho legislature adopted
    the following definition of intellectual disability:
    (a) “Mentally retarded” means significantly
    subaverage general intellectual functioning
    that is accompanied by significant limitations
    8
    We may address these two questions – the § 2254(d) inquiry and de
    novo review of the constitutional claim under §§ 2241(c)(3) and 2254(a)
    – in any order. See 
    Frantz, 533 F.3d at 736
    . Typically, we conduct the
    AEDPA inquiry first, and where, as here, § 2254(d) is not satisfied, we
    need not review the constitutional claim de novo.
    24                  PIZZUTO V. BLADES
    in adaptive functioning in at least two (2) of
    the following skill areas: communication,
    self-care, home living, social or interpersonal
    skills, use of community resources, self-
    direction, functional academic skills, work,
    leisure, health and safety. The onset of
    significant subaverage general intelligence
    functioning and significant limitations in
    adaptive functioning must occur before age
    eighteen (18) years.
    (b) “Significantly subaverage general
    intellectual functioning” means an
    intelligence quotient of seventy (70) or below.
    Idaho Code § 19-2515A(1).
    In 2008, the Idaho Supreme Court applied this definition
    for the first time in Pizzuto’s case. See Pizzuto 
    I, 202 P.3d at 650
    –55. The court began by noting that “the statutory
    definition . . . requires proof of three elements: (1) an
    intelligence quotient (IQ) of 70 or below; (2) significant
    limitations in adaptive functioning in at least two of the ten
    areas listed; and (3) the onset of the offender’s IQ of 70 or
    below and the onset of his or her significant limitations in
    adaptive functioning both must have occurred before the
    offender turned age eighteen.” 
    Id. at 651.
    Focusing on the
    first element, the court held that, “[i]n order for Pizzuto to
    have presented a prima facie case, there must be evidence
    showing that he had an IQ of seventy or below before age
    eighteen.” 
    Id. The court
    then noted that the record included only one IQ
    test score for Pizzuto – a Verbal IQ of 72 on the Wechsler
    PIZZUTO V. BLADES                       25
    Adult Intelligence Scale, Revised, administered by Dr. Emery
    in December 1985, shortly before Pizzuto’s 29th birthday.
    See 
    id. This test
    score, the court concluded, was insufficient
    to establish an IQ of 70 or below before the age of 18:
    Pizzuto argues that an IQ score is only
    accurate within five points. He contends that
    his actual IQ could have been five points
    lower or higher than 72. There are two
    problems with that argument.
    First, when enacting Idaho Code § 19-
    2515A(1), the legislature did not require that
    the IQ score be within five points of 70 or
    below. It required that it be 70 or below.
    Although Pizzuto argued that the district court
    should infer that Pizzuto’s actual IQ was
    lower than his test score, the court could just
    as reasonably have inferred that it was higher.
    The alleged error in IQ testing is plus or
    minus five points. The district court was
    entitled to draw reasonable inferences from
    the undisputed facts. It would be just as
    reasonable to infer that Pizzuto’s IQ on
    December 12, 1985, was 77 as it would be to
    infer that it was 67.
    Second, Pizzuto’s argument also requires
    the district court to infer that Pizzuto’s IQ had
    not decreased during the eleven-year period
    from his eighteenth birthday to the date of his
    IQ test. The district court, as the trier of fact,
    was not required to make that inference,
    especially in light of the opinions of Pizzuto’s
    26                   PIZZUTO V. BLADES
    experts that his long history of drug abuse and
    his epilepsy would have negatively impacted
    his mental functioning.
    
    Id. (citation omitted).
    Pizzuto argues that the Idaho Supreme Court’s decision
    was both “contrary to” and an “unreasonable application” of
    Atkins. His argument begins with the premise that Atkins
    “embraced the clinical definitions of intellectual disability set
    by the American Association on Mental Retardation . . . and
    the American Psychiatric Association.” Opening Brief at 26
    (citing 
    Atkins, 536 U.S. at 308
    n.3, 317 n.22). Then, relying
    on that premise, he argues that the Idaho court disregarded
    these clinical definitions by (1) applying a “hard IQ-70
    cutoff” and (2) requiring him to provide the court with IQ
    testing completed before his 18th birthday. 
    Id. at 31–36.
    Specifically, Pizzuto contends that the Idaho Supreme
    Court’s application of a “hard IQ-70 cutoff” disregarded the
    clinical definitions by: (1) “expressly confin[ing] the
    consideration of the first criteri[on] to an IQ score only,”
    “tak[ing] the IQ score as final and conclusive evidence of a
    defendant’s intellectual capacity when experts in the field
    would consider other evidence”; (2) “reject[ing] the scientific
    limitations of testing, including the standard of error
    measurement . . . universally recognized by the medical
    and psychological professions”; (3) “completely
    misunderst[anding] the purpose and effect of the [standard
    error of measurement]”; and (4) “refus[ing] to consider the
    . . . Flynn Effect.” 
    Id. at 31–32.
                        PIZZUTO V. BLADES                      27
    1. “Contrary to” Prong
    Initially, we reject Pizzuto’s argument that the Idaho
    court’s decision was “contrary to” Atkins. For purposes of
    § 2254(d)(1), “clearly established Federal law” includes only
    the holdings, as opposed to the dicta, of the Supreme Court’s
    decisions. See White v. Woodall, 
    572 U.S. 415
    , 419 (2014).
    Here, the Idaho Supreme Court identified the applicable
    Supreme Court precedent – Atkins – and acknowledged its
    holding that the Eighth Amendment prohibits the execution
    of intellectually disabled offenders. See Pizzuto 
    I, 202 P.3d at 648
    . The state court’s decision, therefore, was not
    “contrary to” Atkins. Although Pizzuto argues that the state
    court failed to follow the clinical standards issued by the
    AAMR and the American Psychiatric Association, Atkins did
    not hold that these standards apply. See 
    Shoop, 139 S. Ct. at 507
    (“Atkins gave no comprehensive definition of ‘mental
    retardation’ for Eighth Amendment purposes.”). The state
    court’s decision, therefore, could not have been “contrary to”
    Atkins on this basis.
    We also reject Pizzuto’s suggestion that the Idaho
    Supreme Court’s application of a hard IQ-70 cutoff was
    “contrary to” or an “unreasonable application of” Atkins’
    “progeny” – a reference to Hall, Brumfield and Moore I.
    Opening Brief at 31. These three cases were decided in 2014,
    2015 and 2017 respectively – years after the Idaho Supreme
    Court’s 2008 decision in Pizzuto’s case. “[U]nder . . .
    § 2254(d)(1), habeas relief may be granted only if the state
    court’s adjudication ‘resulted in a decision that was contrary
    to, or involved an unreasonable application of,’ Supreme
    Court precedent that was ‘clearly established’ at the time of
    the adjudication.” 
    Shoop, 139 S. Ct. at 506
    (emphasis
    added); see also Lockyer v. Andrade, 
    538 U.S. 63
    , 71–72
    28                   PIZZUTO V. BLADES
    (2003) (“‘[C]learly established Federal law’ under
    § 2254(d)(1) is the governing legal principle or principles set
    forth by the Supreme Court at the time the state court renders
    its decision.” (emphasis added)). The Idaho Supreme Court’s
    decision, therefore, could not have been “contrary to” or an
    “unreasonable application” of Atkins’ “progeny.”
    2. “Unreasonable Application” Prong
    Pizzuto’s contention that the Idaho Supreme Court’s
    decision involved an “unreasonable application” of Atkins
    fails as well.
    Pizzuto is correct that the Idaho Supreme Court’s
    application of a “hard IQ-70 cutoff” was inconsistent with the
    clinical definitions in place at the time of the state court’s
    decision. The DSM-IV, adopted in 2000, defined the
    diagnostic criteria for intellectual disability as:
    A. Significantly subaverage intellectual
    functioning: an IQ of approximately 70 or
    below on an individually administered IQ
    test (for infants, a clinical judgment of
    significantly subaverage intellectual
    functioning).
    B. Concurrent deficits or impairments in
    present adaptive functioning (i.e., the
    person’s effectiveness in meeting the
    standards expected for his or her age by
    his or her cultural group) in at least two of
    the following areas: communication, self-
    care, home living, social/interpersonal
    skills, use of community resources, self-
    PIZZUTO V. BLADES                          29
    direction, functional academic skills,
    work, leisure, health, and safety.
    C. The onset is before age 18 years.
    DSM-IV at 49 (emphasis added). This standard does not
    require an IQ of 70 or below; it requires “an IQ of
    approximately 70 or below.” 
    Id. (emphasis added).
    Under
    the DSM-IV, therefore, “it is possible to diagnose Mental
    Retardation in individuals with IQs between 70 and 75 who
    exhibit significant deficits in adaptive behavior.” 
    Id. at 41–42.9
    The 10th edition of the AAMR manual, adopted in 2002,
    defined intellectual disability as follows:
    9
    Under the DSM-IV:
    Significantly subaverage intellectual functioning is
    defined as an IQ of about 70 or below (approximately
    2 standard deviations below the mean). It should be
    noted that there is a measurement error of
    approximately 5 points in assessing IQ, although this
    may vary from instrument to instrument (e.g., a
    Wechsler IQ of 70 is considered to represent a range of
    65–75). Thus, it is possible to diagnose Mental
    Retardation in individuals with IQs between 70 and 75
    who exhibit significant deficits in adaptive behavior.
    Conversely, Mental Retardation would not be
    diagnosed in an individual with an IQ lower than 70 if
    there are no significant deficits or impairments in
    adaptive functioning.
    DSM-IV at 41–42.
    30                   PIZZUTO V. BLADES
    Mental retardation is a disability characterized
    by significant limitations both in intellectual
    functioning and in adaptive behavior as
    expressed in conceptual, social, and practical
    adaptive skills. This disability originates
    before age 18.
    AAMR, Mental Retardation: Definition, Classification, and
    Systems of Supports 8 (10th ed. 2002). Under the intellectual
    functioning prong, “[t]he criterion for diagnosis is
    approximately two standard deviations below the mean,
    considering the standard error of measurement for the
    specific assessment instrument used and the instrument’s
    strengths and weaknesses.” 
    Id. at 37
    (emphasis added). “In
    effect, this expands the operational definition of mental
    retardation to 75, and that score of 75 may still contain
    measurement error.” 
    Id. at 59.
    In contrast to these clinical standards, the Idaho Supreme
    Court required an offender to establish an IQ of 70 or below
    under all circumstances, regardless of the offender’s deficits
    in adaptive functioning. Although the Idaho court recognized
    that “[t]he alleged error in IQ testing is plus or minus five
    points,” Pizzuto 
    I, 202 P.3d at 651
    , it nonetheless required
    Pizzuto to establish an “actual IQ” of 70 or below. See
    Pizzuto 
    III, 729 F.3d at 1217
    n.2; Pizzuto 
    I, 202 P.3d at 651
    (“[T]he statutory definition . . . requires proof of . . . an
    intelligence quotient (IQ) of 70 or below . . . . Significant
    limitations in adaptive functioning alone will not bring an
    offender within the protection of the statute.”); 
    id. (“[W]hen enacting
    Idaho Code § 19-2515A(1), the legislature did not
    require that the IQ score be within five points of 70 or below.
    It required that it be 70 or below.”). In doing so, the court
    failed to recognize that “it is possible to diagnose Mental
    PIZZUTO V. BLADES                      31
    Retardation in individuals with IQs between 70 and 75 who
    exhibit significant deficits in adaptive behavior.” DSM-IV
    at 41–42. Nor did the court consider whether Pizzuto
    satisfied this standard. The state court’s decision, therefore,
    was contrary to the clinical definitions in place at the time.
    This conclusion alone, however, does not establish that
    the Idaho Supreme Court unreasonably applied Atkins for
    purposes of § 2254(d)(1). At the time of the state court’s
    decision in 2008, it was not yet apparent that states were
    required to define intellectual disability in accordance with
    these prevailing clinical definitions. To be sure, Atkins had
    cited these clinical definitions with approval, noting that
    statutory definitions generally conformed to them and
    explaining that “an IQ between 70 and 75 or lower . . . is
    typically considered the cutoff IQ score for the intellectual
    function prong of the mental retardation definition.” 
    Atkins, 536 U.S. at 308
    n.3, 309 n.5, 317 n.22. The Court, however,
    did not adopt these definitions or require states to follow
    them. On the contrary, the Court expressly “le[ft] to the
    States the task of developing appropriate ways to enforce the
    constitutional restriction upon their execution of sentences.”
    
    Id. at 317
    (alterations omitted) (quoting 
    Ford, 477 U.S. at 416
    –17).
    It is now clear that “[t]he legal determination of
    intellectual disability . . . is informed by the medical
    community’s diagnostic framework,” 
    Hall, 572 U.S. at 721
    ,
    and that “[t]he medical community’s current standards supply
    one constraint on States’ leeway in this area,” Moore I, 137 S.
    Ct. at 1053. It was not apparent in 2008, however, that states
    were required to adhere strictly to the AAMR’s and American
    Psychiatric Association’s clinical standards.              We
    acknowledge Hall’s statements that Atkins “provide[d]
    32                   PIZZUTO V. BLADES
    substantial guidance on the definition of intellectual
    disability,” that “[t]he clinical definitions of intellectual
    disability . . . were a fundamental premise of Atkins” and that
    “Atkins did not give the States unfettered discretion to define
    the full scope of the constitutional protection.” 
    Hall, 572 U.S. at 719
    –21. The Supreme Court, however, has held
    that “Atkins gave no comprehensive definition of ‘mental
    retardation’ for Eighth Amendment purposes.” Shoop, 139 S.
    Ct. at 507; see also Bobby v. Bies, 
    556 U.S. 825
    , 831 (2009)
    (explaining that Atkins “did not provide definitive procedural
    or substantive guides for determining when a person who
    claims mental retardation ‘will be so impaired as to fall
    within Atkins’ compass’” (alteration omitted) (quoting 
    Atkins, 536 U.S. at 317
    )); Ybarra v. Filson, 
    869 F.3d 1016
    , 1024 (9th
    Cir. 2017) (“Significantly, Atkins ‘did not provide definitive
    procedural or substantive guides’ to determine who qualifies
    as intellectually disabled.” (quoting 
    Bies, 556 U.S. at 831
    ));
    Moormann v. Schriro, 
    672 F.3d 644
    , 648 (9th Cir. 2012)
    (“The Supreme Court in Atkins did not define mental
    retardation as a matter of federal law.”).
    This is not a case in which the state court utterly
    disregarded the clinical definitions. To be sure, the Idaho
    Supreme Court erred by defining the significantly subaverage
    intellectual functioning criterion as an IQ of 70 or below, see
    Idaho Code § 19-2515A(1)(b); Pizzuto 
    I, 202 P.3d at 651
    ,
    rather than “an IQ of approximately 70 or below,” DSM-IV
    at 49 (emphasis added), and it erred by disregarding the
    portions of the clinical standards recognizing that “it is
    possible to diagnose Mental Retardation in individuals with
    IQs between 70 and 75 who exhibit significant deficits in
    adaptive behavior,” 
    id. at 41–42.
    In other respects, however,
    § 19-2515A(1) tracks the clinical definitions cited by Atkins.
    See 
    Atkins, 536 U.S. at 308
    n.3. In contrast to Hall,
    PIZZUTO V. BLADES                      33
    moreover, the Idaho court at least recognized the existence of
    a standard error of measurement of plus or minus five points
    and afforded Pizzuto an opportunity to “present additional
    evidence of intellectual disability even when an IQ test score
    is above 70.” 
    Hall, 572 U.S. at 717
    .
    In short, because it was not apparent in 2008 that states
    were required to adhere closely to the clinical definitions of
    intellectual disability, the Idaho Supreme Court’s application
    of a “hard IQ-70 cutoff” was not an “unreasonable
    application” of Atkins.         “[R]elief is available under
    § 2254(d)(1)’s unreasonable-application clause if, and only if,
    it is so obvious that a clearly established rule applies to a
    given set of facts that there could be no ‘fairminded
    disagreement’ on the question.” 
    Woodall, 572 U.S. at 427
    (quoting 
    Richter, 562 U.S. at 103
    ). We cannot say that this
    standard has been satisfied here.
    Relatedly, it is now clear as a matter of federal law that
    “an individual with an IQ test score ‘between 70 and 75 or
    lower’ may show intellectual disability by presenting
    additional evidence regarding difficulties in adaptive
    functioning.” 
    Hall, 572 U.S. at 722
    (citation omitted)
    (quoting 
    Atkins, 536 U.S. at 309
    n.5); see 
    id. at 723
    (“[W]hen
    a defendant’s IQ test score falls within the test’s
    acknowledged and inherent margin of error, the defendant
    must be able to present additional evidence of intellectual
    disability, including testimony regarding adaptive deficits.”);
    
    Brumfield, 135 S. Ct. at 2278
    (“[I]t is unconstitutional to
    foreclose ‘all further exploration of intellectual disability’
    simply because a capital defendant is deemed to have an IQ
    above 70.” (quoting 
    Hall, 572 U.S. at 704
    )); Moore I, 137 S.
    Ct. at 1049 (“Because the lower end of Moore’s score range
    falls at or below 70, the [state court] had to move on to
    34                   PIZZUTO V. BLADES
    consider Moore’s adaptive functioning.”); DSM-5 at 37
    (“Individuals with intellectual disability have scores of
    approximately two standard deviations or more below the
    population mean, including a margin for measurement error
    (generally +5 points). On tests with a standard deviation of
    15 and a mean of 100, this involves a score of 65–75 (70 ±
    5).”); 
    id. (“IQ test
    scores are approximations of conceptual
    functioning but may be insufficient to assess reasoning in
    real-life situations and mastery of practical tasks. For
    example, a person with an IQ score above 70 may have such
    severe adaptive behavior problems in social judgment, social
    understanding, and other areas of adaptive functioning that
    the person’s actual functioning is comparable to that of
    individuals with a lower IQ score.”); AAIDD-11 at 35
    (“[T]he intellectual functioning criterion for diagnosis of
    [intellectual disability] is approximately two standard
    deviations below the mean, considering the standard error of
    measurement . . . . The intent of this definition is not to
    specify a hard and fast cutoff point/score for meeting the
    significant limitations in intellectual functioning criterion
    . . . . In addition, significant limitations in intellectual
    functioning is only one of the three criteria used to establish
    a diagnosis of [intellectual disability].”); 
    id. at 40
    (“A fixed
    point cutoff score for [intellectual disability] is not
    psychometrically justifiable.”). The Idaho Supreme Court
    violated this principle by requiring an “actual” IQ of 70 or
    below. This point, however, was not beyond fairminded
    disagreement in 2008. We cannot say, therefore, that the
    Idaho Supreme Court’s application of Atkins “was so lacking
    in justification that there was an error well understood and
    comprehended in existing law beyond any possibility for
    fairminded disagreement.” 
    Richter, 562 U.S. at 103
    .
    PIZZUTO V. BLADES                               35
    We reach the same conclusion with respect to the Idaho
    Supreme Court’s failure to apply the Flynn effect.10 Although
    mentioned in recent clinical standards, see DSM-5 at 37;
    AAIDD-11 at 37, Atkins did not discuss the Flynn effect, and
    clinical standards in existence at the time of the Idaho
    Supreme Court’s decision in 2008 did not discuss the need to
    adjust IQ test scores to account for the use of outdated test
    norms. Thus, “it cannot be said that the [state court’s] failure
    to consider and apply the Flynn Effect is contrary to, or an
    unreasonable application of, clearly established federal law.”
    Hooks v. Workman, 
    689 F.3d 1148
    , 1170 (10th Cir. 2012).
    Finally, we reject Pizzuto’s contention that the Idaho
    Supreme Court’s decision was contrary to or an unreasonable
    application of Atkins because the court required him to
    provide the results of an IQ test administered before his 18th
    birthday. With respect to this contention, we simply disagree
    10
    The Flynn effect refers to the observation that IQ scores have been
    increasing over time. See AAIDD-11 at 37; Smith v. Ryan, 
    813 F.3d 1175
    ,
    1184 (9th Cir. 2016) (“The basic premise of the Flynn effect is that
    because average IQ scores increase over time, a person who takes an IQ
    test that has not recently been normed against a representative sample of
    the population will receive an artificially inflated IQ score.” (emphasis
    omitted)). In light of this effect, the AAIDD has indicated that “best
    practices require recognition of a potential Flynn Effect when older
    editions of an intelligence test (with corresponding older norms) are used
    in the assessment or interpretation of an IQ score.” AAIDD-11 at 37. “In
    cases where a test with aging norms is used, a correction for the age of the
    norms is warranted.” Id.; see 
    Smith, 813 F.3d at 1185
    (noting that the
    AAIDD-11 “recognizes the existence of the Flynn Effect and recommends
    correcting for the age of norms in outdated tests”). The DSM-5 likewise
    identifies the Flynn effect as one of several “[f]actors that may affect test
    scores.” DSM-5 at 37. Here, Pizzuto argues that, when his IQ score of 72
    is adjusted for the Flynn effect, “it becomes a score of 70.” Opening Brief
    at 33 n.2.
    36                   PIZZUTO V. BLADES
    with Pizzuto’s reading of the Idaho Supreme Court’s
    decision. If the state court had required Pizzuto to present a
    pre-18 IQ test score, it could have disposed of his claim
    simply by noting the absence of such a score in the record.
    Instead, it explained that “there must be evidence showing
    that [Pizzuto’s] IQ was 70 or below prior to his eighteenth
    birthday,” Pizzuto 
    I, 202 P.3d at 651
    , regardless of when he
    was tested.
    ***
    In sum, the record does not establish that the Idaho
    Supreme Court’s decision was “contrary to” or involved an
    “unreasonable application” of clearly established Supreme
    Court precedent. See 28 U.S.C. § 2254(d)(1). Although the
    state court’s decision was contrary to clinical standards in
    place at the time, it was not obvious at that time that strict
    adherence to the clinical standards was required. Similarly,
    although the state court’s requirement of an IQ of 70 or below
    is contrary to Hall, Brumfield and Moore I, these decisions all
    postdated the state court’s decision, and it was not obvious
    under Atkins alone that, for Eighth Amendment purposes, “an
    individual with an IQ test score ‘between 70 and 75 or lower’
    may show intellectual disability by presenting additional
    evidence regarding difficulties in adaptive functioning.”
    
    Hall, 372 U.S. at 722
    (citation omitted) (quoting 
    Atkins, 536 U.S. at 309
    n.5). Cf. 
    Shoop, 139 S. Ct. at 508
    (“Although
    the Court of Appeals asserted that the holding in Moore was
    ‘merely an application of what was clearly established by
    Atkins,’ the court did not explain how the rule it applied can
    be teased out of the Atkins Court’s brief comments about the
    meaning of what it termed ‘mental retardation.’” (citation
    omitted)); 
    Ybarra, 869 F.3d at 1024
    –25 (“[A]lthough Ybarra
    insists that the Nevada Supreme Court unreasonably applied
    PIZZUTO V. BLADES                      37
    Atkins, he relies almost exclusively on the Supreme Court’s
    subsequent, more detailed decisions in Moore, Hall, and
    Brumfield. These decisions might redefine and expand
    Atkins, but they cannot show that the Nevada Supreme Court
    applied Atkins in a way that ‘was so lacking in justification
    that there was an error well understood and comprehended in
    existing law beyond any possibility for fairminded
    disagreement.’” (footnote omitted) (quoting 
    Richter, 562 U.S. at 103
    )).
    B. Section 2254(d)(2)
    Pizzuto alternatively contends that the Idaho Supreme
    Court’s decision “was based on an unreasonable
    determination of the facts in light of the evidence presented
    in the State court proceeding.” 28 U.S.C. § 2254(d)(2).
    Under § 2254(d)(2), we may not characterize a state
    court’s factual determinations as unreasonable “merely
    because [we] would have reached a different conclusion in
    the first instance.” 
    Brumfield, 135 S. Ct. at 2277
    (alteration
    in original) (quoting Wood v. Allen, 
    558 U.S. 290
    , 301
    (2010)). “Instead, § 2254(d)(2) requires that we accord the
    state trial court substantial deference.” 
    Id. “If ‘[r]easonable
    minds reviewing the record might disagree about the finding
    in question, on habeas review that does not suffice to
    supersede the trial court’s . . . determination.’” 
    Id. (alterations in
    original) (quoting 
    Wood, 558 U.S. at 301
    ).
    Here, Pizzuto challenges the state court’s factual
    determinations on several grounds. We address them in turn.
    38                   PIZZUTO V. BLADES
    1. Pizzuto’s Argument That the State Court’s
    Determinations Are Unreasonable Because They
    Are Inconsistent with Clinical Definitions
    Pizzuto argues that the Idaho Supreme Court’s factual
    determinations “are unreasonable because they are not
    consistent with clinical definitions and best practices in
    defining and diagnosing [intellectual disability] as guaranteed
    by the Eighth Amendment in Atkins and enforced in Hall.”
    Opening Brief at 37. He maintains that “[t]he state court’s
    factual findings are unreasonable in light of the record before
    it because they are in direct conflict with professional
    standards established to determine intellectual disability and
    thus, not ‘informed by’ them as instructed by Hall.” 
    Id. at 38.
    As noted, we agree with Pizzuto that the Idaho Supreme
    Court failed to apply the clinical standards in use at the time
    of its decision. Those standards required an IQ of
    “approximately 70” and recognized that “it is possible to
    diagnose Mental Retardation in individuals with IQs between
    70 and 75 who exhibit significant deficits in adaptive
    behavior.” DSM-IV at 41–42. The Idaho Supreme Court, by
    contrast, required an “actual” IQ of “70 or below,”
    irrespective of “[s]ignificant limitations in adaptive
    functioning.” Pizzuto 
    I, 202 P.3d at 651
    . Pizzuto, therefore,
    is correct in arguing that the state court’s determination that
    he failed to make a prima facie showing of intellectual
    disability is “not consistent with clinical definitions”
    discussed in Atkins and subsequently required by Hall.
    Under § 2254(d)(2), however, we review a state court’s
    factual determinations, not its legal conclusions. Here, the
    Idaho Supreme Court did not purport to determine whether
    Pizzuto was intellectually disabled under the clinical
    PIZZUTO V. BLADES                      39
    definitions. Instead, it determined only that Pizzuto failed to
    make a prima facie “showing that his IQ was 70 or below
    prior to his eighteenth birthday.” 
    Id. It is
    that factual
    determination, therefore, that we may review under
    § 2254(d)(2), not the state court’s legal conclusion that an IQ
    of 70 or below was required. Accordingly, we must reject
    Pizzuto’s contention that the state court’s factual
    determinations are unreasonable merely because the state
    court did not apply the clinical definitions of intellectual
    disability.
    2. Pizzuto’s Argument That the State Court’s
    Unreasonably Failed to Consider His School
    Records as Evidence of Subaverage Intellectual
    Functioning
    Pizzuto argues that the Idaho Supreme Court’s
    determination that he failed to make a prima facie showing
    that his IQ was 70 or below before his 18th birthday was
    unreasonable because it focused exclusively on his single IQ
    test score while ignoring other evidence of subaverage
    intellectual functioning in the form of his “abysmal school
    record.” Opening Brief at 39.
    Pizzuto is correct that a “state-court fact-finding process
    is undermined where the state court has before it, yet
    apparently ignores, evidence that supports petitioner’s claim.”
    
    Taylor, 366 F.3d at 1001
    . Here, however, Pizzuto has not
    shown that the Idaho Supreme Court ignored such evidence.
    First, although Pizzuto cites his “abysmal school record,”
    the actual evidence in the record regarding his schooling is
    sparse and incomplete. It consists solely of affidavits from
    five educators, two of whom have no specific recollection of
    40                   PIZZUTO V. BLADES
    Pizzuto. Although some of these records show that Pizzuto
    received low grades and was held back, there are many
    reasons Pizzuto may have performed poorly in school, and no
    expert opined that this poor performance was evidence of
    significantly subaverage intellectual functioning or an IQ of
    70 or below. Thus, even if Pizzuto’s school records are some
    evidence of pre-18 significantly subaverage intellectual
    functioning, they do not render unreasonable the Idaho
    Supreme Court’s determination that Pizzuto failed to make a
    prima facie showing that he had an IQ of 70 or below before
    the age of 18. School records can be strong evidence of
    intellectual disability. See, e.g., Moore 
    I, 137 S. Ct. at 1051
    ;
    
    Hall, 572 U.S. at 705
    , 712; 
    Smith, 813 F.3d at 1186
    . Here,
    however, the records do not show that the state court’s
    determination was objectively unreasonable under
    § 2254(d)(2)’s demanding standard.
    Second, we cannot say that the Idaho Supreme Court
    ignored this evidence within the meaning of Taylor when it
    was Pizzuto himself who failed to bring the evidence to the
    court’s attention. In state court, Pizzuto cited his school
    records to show limitations in adaptive functioning but not to
    establish subaverage intellectual functioning. To establish
    the latter, Pizzuto instead “relied solely upon Dr. Emery’s IQ
    determination.” Pizzuto 
    I, 202 P.3d at 652
    . The state court’s
    focus on Pizzuto’s IQ test score, therefore, was consistent
    with Pizzuto’s own contentions.
    PIZZUTO V. BLADES                        41
    3. Pizzuto’s Argument That the State Court
    Unreasonably Determined That His IQ Could
    Have Declined in Adulthood Due to Drug Abuse
    and Epilepsy
    Pizzuto argues that it was unreasonable for the Idaho
    Supreme Court to determine that his IQ could have declined
    between the time he was 18 (in 1974) and the time of Dr.
    Emery’s IQ testing (in 1985).
    The Idaho Supreme Court determined that the state trial
    court could have inferred that Pizzuto’s IQ “decreased during
    the eleven-year period from his eighteenth birthday to the
    date of his IQ test . . . , especially in light of the opinions of
    Pizzuto’s experts that his long history of drug abuse and his
    epilepsy would have negatively impacted his mental
    functioning.” Pizzuto 
    I, 202 P.3d at 651
    .
    Pizzuto contends that this determination was
    unreasonable. First, he argues that “incidents of drug use and
    epilepsy, if they occurred, would be documented,” because he
    spent nine of these 11 years in prison. Opening Brief at 40.
    Because his prison records do not show continued seizures or
    drug use, Pizzuto argues that a “more reasonable inference”
    would be that he was substantially drug free and not
    experiencing seizures after he turned 19. 
    Id. at 41–42.
    The Idaho Supreme Court’s determination, however, was
    based on record evidence from Pizzuto’s own experts. In
    1988, Dr. James Merikangas noted that Pizzuto had “a life
    long history of almost continuous drug abuse including
    intravenous Heroin as well as cocaine, speed and marijuana”;
    that Pizzuto’s “long history of polydrug abuse has caused him
    further neurological dysfunction and . . . substantial defects
    42                    PIZZUTO V. BLADES
    of mind and reason”; and that “[w]e will probably not know
    to any scientific degree of accuracy what his state of mind
    was at the time of the alleged crimes.” In 2004, Dr. Craig
    Beaver opined that Pizzuto would benefit from further
    neurological study in part because, “[o]ften, patients that have
    persistent seizure disorders . . . will decline over time in their
    overall mental abilities”:
    Mr. Pizzuto has continued to require
    pharmacological management of his seizure
    disorder since he was last examined by myself
    in 1996.       He has continued to have
    neurological difficulties. Therefore, given
    that it has now been over eight years since his
    last comprehensive neuropsychological
    examination, I would strongly recommend
    that he undergo repeat neuropsychometric
    studies. Repeat neuropsychometric studies
    are needed to better determine Gerald
    Pizzuto’s cognitive abilities. Often, patients
    that have persistent seizure disorders, for
    example, will decline over time in their
    overall mental abilities.
    In light of this evidence, it was not unreasonable for the
    Idaho Supreme Court to determine that the state trial court
    reasonably could have inferred that Pizzuto’s IQ may have
    declined as a result of drug abuse or epilepsy. Even if, as
    Pizzuto contends, a “more reasonable inference” would be
    that he was substantially drug free and not experiencing
    seizures after he turned 19, this does not render the state
    court’s contrary determination objectively unreasonable
    under § 2254(d)(2).
    PIZZUTO V. BLADES                      43
    Second, Pizzuto argues that it would have been
    unreasonable to infer from Dr. Beaver’s 2004 affidavit that
    Pizzuto’s mental functioning may have declined between
    1974 and 1985, see Pizzuto 
    I, 202 P.3d at 652
    , because
    “[t]here is no statement in the affidavit that Mr. Pizzuto’s IQ
    had declined . . . between 1996 and 2008,” let alone “any
    statement that Mr. Pizzuto’s IQ had declined . . . from his
    18th birthday to the time of Dr. Emery’s testing.” Opening
    Brief at 42. Dr. Beaver’s affidavit, however, clearly gave the
    impression that Pizzuto’s mental functioning may have
    declined between 1996 and 2004. It would not have been
    unreasonable, therefore, to infer that it also might have
    declined between 1974 and 1985. Dr. Beaver did not need to
    expressly state that a decline in IQ occurred for the Idaho
    Supreme Court to determine that it was possible. The very
    reason Dr. Beaver requested more testing was that those with
    persistent seizure disorders, like Pizzuto, tend to decline in
    their mental abilities over time. The Idaho Supreme Court’s
    determination, therefore, was not unreasonable.
    4. Pizzuto’s Argument That the State Court’s Denial
    of an Evidentiary Hearing Was Based on an
    Unreasonable Determination of the Facts
    Pizzuto argues that he “only needed to raise a reasonable
    doubt regarding his intellectual capacity to be entitled to an
    evidentiary hearing” and that the Idaho Supreme Court’s
    determination that he “did not meet that low threshold was
    unreasonable” under § 2254(d)(2). Opening Brief at 46.
    This argument is unpersuasive. First, although Pizzuto
    argues that the Idaho Supreme Court unreasonably
    determined that he did not raise a reasonable doubt regarding
    his intellectual capacity, the Idaho Supreme Court in fact
    44                   PIZZUTO V. BLADES
    never addressed that question. The only question the state
    court decided was whether Pizzuto had made a prima facie
    showing of intellectual disability, in particular whether he had
    made a prima facie showing of a pre-18 IQ of 70 or below.
    The court did not address whether Pizzuto had raised a
    “reasonable doubt” as to his intellectual disability.
    Accordingly, there is no “reasonable doubt” determination for
    us to review under § 2254(d)(2).
    Second, although Pizzuto contends that the Idaho
    Supreme Court’s failure to apply a “reasonable doubt”
    standard was “contrary to, and an unreasonable application of
    Atkins,” as “expressly addressed in Brumfield,” we must
    disagree. Opening Brief at 46. Atkins did not address the
    legal standard applicable to a request for an evidentiary
    hearing. In Brumfield, the state courts adopted a reasonable
    doubt standard, see 
    Brumfield, 135 S. Ct. at 2274
    , and the
    Supreme Court presumed that this standard would be
    consistent with Atkins, see 
    id. at 2276
    (“[W]e do not question
    the propriety of the legal standard the trial court applied, and
    presume that a rule according an evidentiary hearing only to
    those capital defendants who raise a ‘reasonable doubt’ as to
    their intellectual disability is consistent with our decision in
    Atkins.”). The Court, however, did not adopt a reasonable
    doubt standard. See 
    id. The Idaho
    Supreme Court’s failure
    to apply such a standard, therefore, was not “contrary to” or
    an “unreasonable application” of Atkins. See 28 U.S.C.
    § 2254(d)(1).
    5. Pizzuto’s Argument That the State Court’s
    Factfinding Process Was Unreasonable
    Pizzuto argues more broadly that the denial of a hearing,
    as well as the denial of access to an expert, rendered the
    PIZZUTO V. BLADES                      45
    Idaho Supreme Court’s factfinding             process    itself
    unreasonable under § 2254(d)(2).
    As we explained in 
    Hibbler, 693 F.3d at 1146
    ,
    “[c]hallenges under § 2254(d)(2) fall into two main
    categories.” “First, a petitioner may challenge the substance
    of the state court’s findings and attempt to show that those
    findings were not supported by substantial evidence in the
    state court record.” 
    Id. Second, as
    relevant here, “a
    petitioner may challenge the fact-finding process itself on the
    ground that it was deficient in some material way.” 
    Id. In some
    circumstances, for instance, a “state court’s failure to
    hold an evidentiary hearing may render its fact-finding
    process unreasonable under § 2254(d)(2).” 
    Id. at 1147.
    The Idaho Supreme Court did not specifically address
    whether the state trial court erred by granting summary
    judgment to the state on Pizzuto’s Atkins claim without
    holding an evidentiary hearing. The court, however,
    addressed a related question – whether the state trial court
    erred by dismissing Pizzuto’s petition without permitting
    further testing. See Pizzuto 
    I, 202 P.3d at 655
    –56. The court
    concluded that the trial court did not err. First, the court
    noted that Pizzuto had not pursued the motion for testing.
    Pizzuto had moved for additional testing in October 2004 but
    he “did not notice this motion for a hearing.” 
    Id. at 655.
    Instead, “[w]ithout pursuing the motion for testing, Pizzuto
    moved for summary judgment on September 23, 2005.” 
    Id. He did
    so, moreover, even though, under Idaho law, “[i]f a
    trial court denies a party’s motion for summary judgment, it
    has discretion to grant summary judgment to the opposing
    party.” 
    Id. at 656
    (citing Hardwood v. Talbert, 
    39 P.3d 612
    ,
    617 (Idaho 2001)). Even in connection with the summary
    judgment proceedings, “Pizzuto did not ask the [state trial]
    46                   PIZZUTO V. BLADES
    court to rule on his motion for the specified additional
    testing.” 
    Id. Second, as
    framed by the Idaho Supreme Court, the
    central issue in the case was whether Pizzuto could establish
    a pre-18 IQ of 70 or below. Pizzuto did not argue that, were
    he afforded the opportunity to conduct further testing, he
    would develop additional evidence on that question. The
    court reasoned:
    The definition of “mentally retarded” in
    Idaho Code § 19-2515A requires that the
    defendant have an IQ of 70 or below both at
    the time of the murder(s) and prior to age
    eighteen. In its briefing opposing Pizzuto’s
    motion for summary judgment, the State
    argued that Pizzuto had failed to provide
    evidence that his IQ was 70 or below and
    failed to provide evidence showing it was 70
    or below prior to his eighteenth birthday.
    Pizzuto’s alleged IQ is obviously a matter
    requiring expert testimony. He did not offer
    any expert testimony opining that his IQ was
    ever 70 or below, nor does he allege that the
    requested additional testing was intended to
    address that issue.
    
    Id. (emphasis added).
    In short, Pizzuto did not pursue his motion for additional
    testing, and he did not contend that further factual
    development of the record would shed additional light on the
    dispositive issue – his ability to establish a pre-18 IQ of 70 or
    below. Under these circumstances, we cannot say that the
    PIZZUTO V. BLADES                      47
    denial of an evidentiary hearing rendered the state court’s
    factfinding process unreasonable under § 2254(d)(2)’s highly
    deferential standard. See 
    Hibbler, 693 F.3d at 1146
    –47
    (“[W]hen the challenge is to the state court’s procedure, mere
    doubt as to the adequacy of the state court’s findings of fact
    is insufficient; we must be satisfied that any appellate court
    to whom the defect in the state court’s fact-finding process is
    pointed out would be unreasonable in holding that the state
    court’s fact-finding process was adequate.” (alterations and
    internal quotation marks omitted)).
    6. Pizzuto’s Remaining § 2254(d)(2) Arguments
    The § 2254(d)(2) portion of Pizzuto’s opening brief
    appears to fault the Idaho Supreme Court’s decision on
    several other grounds. The brief says, for example, that the
    Idaho Supreme Court’s decision “rests on an irregular
    application of Idaho law.” Opening Brief at 37. It also
    asserts that the state court’s denial of an evidentiary hearing
    violated Idaho Code § 19-2515A, as well as the
    “requirements of Due Process and Equal Protection.” 
    Id. at 44.
    Pizzuto’s brief, however, does not “specifically and
    distinctly” argue these issues. See United States v. Kama,
    
    394 F.3d 1236
    , 1238 (9th Cir. 2005). We therefore decline to
    address them. See 
    id. *** In
    sum, the record does not establish that the Idaho
    Supreme Court’s decision was based on an unreasonable
    determination of the facts under § 2254(d)(2).
    48                   PIZZUTO V. BLADES
    CONCLUSION
    Because § 2254(d) is not satisfied, we hold that the
    district court properly denied habeas relief. We need not
    address Pizzuto’s remaining appellate arguments or review
    his Atkins claim de novo. Accordingly, we do not address
    whether Pizzuto is intellectually disabled or whether his
    execution would violate the Eighth Amendment.
    Our decision, however, does not preclude the Idaho courts
    from reconsidering those questions in light of intervening
    events. Although the Idaho courts rejected Pizzuto’s Atkins
    claim in 2008, they did so without the benefit of an
    evidentiary hearing, without the benefit of the Supreme
    Court’s decisions in Hall, Brumfield and Moore I, and
    without the benefit of the most recent iterations of the
    AAIDD and American Psychiatric Association clinical
    standards. Since 2008, the United States Supreme Court has
    made clear that “it is unconstitutional to foreclose ‘all further
    exploration of intellectual disability’ simply because a capital
    defendant is deemed to have an IQ above 70,” 
    Brumfield, 135 S. Ct. at 2278
    (quoting 
    Hall, 572 U.S. at 704
    ), and the
    professional clinical standards now advise that “best practices
    require recognition of a potential Flynn Effect when older
    editions of an intelligence test (with corresponding older
    norms) are used in the assessment or interpretation of an IQ
    score,” AAIDD-11 at 37. The Idaho courts have not yet
    addressed whether, under these standards, Pizzuto’s execution
    would violate the Eighth Amendment.
    The judgment of the district court is affirmed. Each party
    shall bear its own costs on appeal.
    AFFIRMED.