Kevan Brumfield v. Burl Cain, Warden ( 2016 )


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  •      Case: 12-30256    Document: 00513375522    Page: 1   Date Filed: 02/10/2016
    REVISED February 10, 2016
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE FIFTH CIRCUIT
    United States Court of Appeals
    Fifth Circuit
    FILED
    No. 12-30256                  December 16, 2015
    Lyle W. Cayce
    KEVAN BRUMFIELD,                                                       Clerk
    Petitioner - Appellee
    v.
    BURL CAIN, WARDEN, LOUISIANA STATE PENITENTIARY,
    Respondent – Appellant
    Appeal from the United States District Court
    for the Middle District of Louisiana
    Before KING, CLEMENT, and ELROD, Circuit Judges.
    KING, Circuit Judge:
    Petitioner–Appellee Kevan Brumfield was convicted of first degree
    murder and sentenced to death in 1995. Following state court proceedings,
    Brumfield filed a petition for a writ of habeas corpus in the district court,
    arguing that he is ineligible for the death penalty under Atkins v. Virginia, 
    536 U.S. 304
    (2002), because he is intellectually disabled. The district court found
    that the state court erred by not holding an Atkins hearing on whether
    Brumfield was intellectually disabled. Following a multi-day hearing in 2010,
    the district court granted Brumfield a writ of habeas corpus, finding that he
    was intellectually disabled under Louisiana’s statutory definition of
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    No. 12-30256
    intellectual disability. Without reaching the merits of Brumfield’s claim that
    he is intellectually disabled, this court reversed the district court’s judgment.
    This court held that because Brumfield had failed to satisfy the requirements
    of 28 U.S.C. § 2254(d), the district court should not have reached the merits of
    his Atkins claim. The Supreme Court reversed and remanded, holding that
    Brumfield had indeed satisfied the requirements of 28 U.S.C. § 2254(d) and
    that he was thus entitled to have his claim of intellectual disability under
    Atkins evaluated on the merits. On remand, we review for clear error the
    district court’s determination that Brumfield is, in fact, intellectually disabled.
    Because the district court’s determination that Brumfield is intellectually
    disabled is plausible in light of the record as a whole, its determination is not
    clearly erroneous. Accordingly, we AFFIRM the ruling of the district court.
    I. FACTUAL AND PROCEDURAL BACKGROUND
    The facts and procedural history of this case are recounted exhaustively
    in prior opinions. See Brumfield v. Cain, 
    135 S. Ct. 2269
    (2015) [hereinafter
    Brumfield (S. Ct.)]; Brumfield v. Cain, 
    744 F.3d 918
    (5th Cir. 2014) [hereinafter
    Brumfield (5th Cir.)]; Brumfield v. Cain (Brumfield II), 
    854 F. Supp. 2d 366
    (M.D. La. 2012); Brumfield v. Cain (Brumfield I), No. CIV.A.04-787JJB-CN,
    
    2008 WL 2600140
    (M.D. La. June 30, 2008); State v. Brumfield, 
    737 So. 2d 660
    (La. 1998) [hereinafter Brumfield (La.)]. We recount the facts and procedural
    history as relevant to the limited question before us today.
    A. The Original Crime and State Court Proceedings
    On January 7, 1993, Petitioner–Appellee Kevan Brumfield and an
    accomplice, Henri Broadway, opened fire on a Baton Rouge Police Department
    vehicle driven by Corporal Betty Smothers. Smothers was escorting Kimen
    Lee, an assistant manager at the grocery store where Smothers worked part
    time as a security guard, as Lee made the grocery store’s nightly bank deposit.
    Brumfield fired seven rounds from the left side of the police cruiser, and
    2
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    Broadway fired five rounds from the right side. Lee survived, but Smothers
    did not. Baton Rouge police officers arrested Brumfield for Smothers’ murder
    on January 11, 1993. When police interrogated Brumfield, he initially denied
    any involvement in Smothers’ murder and claimed that he had been with his
    brother at the time. After Brumfield’s brother denied that claim, Brumfield
    gave a videotaped statement admitting that he drove the getaway car but
    denying that he murdered Smothers.                    Later, Brumfield gave another
    videotaped statement where he admitted to being in the bank parking lot and
    firing shots at the police car.
    Following a multi-week trial in June and July of 1995, a jury found
    Brumfield guilty of first degree murder. He was subsequently sentenced to
    death on July 3, 1995. Brumfield appealed his conviction, but the Supreme
    Court of Louisiana affirmed the state trial court. Brumfield 
    (La.), 737 So. 2d at 662
    , 671. And the Supreme Court of the United States denied his petition
    for certiorari thereafter. Brumfield v. Louisiana, 
    526 U.S. 1025
    (1999).
    In March 2000, Brumfield filed for postconviction relief with a state trial
    court before the Supreme Court of the United States issued its decision in
    
    Atkins, 536 U.S. at 321
    , prohibiting the execution of intellectually disabled
    criminals. 1 Brumfield later amended his state petition to assert an Atkins
    claim and argued that he was entitled to an evidentiary hearing on his
    intellectual disability claim. 2 Brumfield requested funds to develop his claim,
    1  Consistent with the Supreme Court’s guidance, we use the term “intellectually
    disabled” instead of “mentally retarded.” The two terms describe “identical phenomen[a].”
    Hall v. Florida, 
    134 S. Ct. 1986
    , 1990 (2014).
    2 Brumfield provided the following evidence of his intellectual disability:
    1) his IQ score, obtained prior to trial, of 75; 2) his slow progress in school; 3)
    his premature birth; 4) his treatment at multiple psychiatric hospitals; 5)
    various medications he was prescribed; and 6) testimony that he exhibited
    slower responses than “normal babies,” suffered from seizures, and was
    hospitalized for months after his birth.
    3
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    but the state trial court denied his petition in its entirety on October 23, 2003.
    Brumfield then filed a writ with the Supreme Court of Louisiana, alleging,
    inter alia, that the trial court erred by failing to hold an Atkins hearing. That
    court denied the writ without explanation. Brumfield v. State, 
    885 So. 2d 580
    ,
    580 (La. 2004).
    B. Federal District Court Proceedings
    Following the Supreme Court of Louisiana’s dismissal of his appeal,
    Brumfield petitioned the United States District Court for the Middle District
    of Louisiana for a writ of habeas corpus, asking the court “to declare him
    [intellectually disabled] and ineligible for the death penalty under Atkins.”
    Brumfield 
    II, 854 F. Supp. 2d at 370
    . Brumfield filed an amended petition in
    2007 re-raising his Atkins claim, supported by expert findings developed with
    federal funding. A magistrate judge recommended that, although the state
    court’s refusal to grant an Atkins hearing was “reasonable and in accordance
    with clearly established federal law,” the district court should consider the
    additional evidence Brumfield presented in his amended habeas petition. The
    magistrate judge explained that Brumfield had demonstrated cause for failing
    to provide the state court with expert evidence because the state court denied
    him funding to develop this evidence. The magistrate judge further reviewed
    the additional evidence submitted by Brumfield and concluded that he had
    established a prima facie case of intellectual disability and was thus entitled
    to an Atkins hearing. The district court adopted the magistrate judge’s report
    and recommendation and held an Atkins hearing July 12–16 and August 3–4,
    2010, discussed in detail below. Brumfield 
    II, 854 F. Supp. 2d at 370
    .
    Brumfield (5th 
    Cir.), 744 F.3d at 921
    (footnotes omitted).
    4
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    In its opinion granting Brumfield a writ of habeas corpus, the district
    court first addressed the legal prerequisites to a federal habeas hearing before
    addressing the substance of Brumfield’s Atkins claim. Brumfield II, 854 F.
    Supp. 2d at 373, 384. Under the Antiterrorism and Effective Death Penalty
    Act of 1996 (AEDPA), Brumfield could obtain federal habeas relief only if, in
    rejecting his claim, the state court’s decision “was either ‘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.’” Brumfield (S. 
    Ct.), 135 S. Ct. at 2275
    (quoting 28
    U.S.C. § 2254(d)(1), (2)). The district court found that denying Brumfield an
    evidentiary hearing without providing him with the funds to develop his Atkins
    claim “represented an unreasonable application of then-existing due process
    law as determined by the Supreme Court” and therefore satisfied § 2254(d)(1).
    Brumfield 
    II, 854 F. Supp. 2d at 383
    –84. The district court also concluded that
    the state trial court’s denial of an Atkins hearing “suffered from an
    unreasonable determination of the facts in light of the evidence presented . . .
    in violation of § 2254(d)(2).” 
    Id. at 379.
          The district court then analyzed the merits of Brumfield’s Atkins claim.
    In determining whether Brumfield is intellectually disabled—and therefore
    barred from being sentenced to death under Louisiana law, La. Code Crim.
    Proc. Ann. art. 905.5.1(A)—the district court relied heavily on the American
    Association on Intellectual and Developmental Disabilities’ (AAIDD’s) 3 Mental
    Retardation: Definition, Classification, and Systems of Support (10th ed. 2002)
    [hereinafter Red Book], which “contains the current, consensus definition of
    The AAIDD was formerly known as the American Association on Mental Retardation
    3
    (AAMR).
    5
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    [intellectual disability],” as “Louisiana law tracks the clinical definition
    provided by the [Red Book].”        Brumfield 
    II, 854 F. Supp. 2d at 385
    –86.            To
    establish an intellectual disability, the district court explained, “Brumfield
    bears the burden of proving by a preponderance of the evidence that he meets
    the statutory definition.” 
    Id. at 385
    (citing La. Code Crim. Proc. Ann. art.
    905.5.1(C)(1)).
    All of the experts who testified in this case agreed on the relevant criteria
    for diagnosing intellectual disability. 4 Consistent with the guidance from the
    United States Supreme Court and the Louisiana Supreme Court and La. Code
    Crim. Proc. Art. 905.5.1, the experts agreed that an intellectual disability
    diagnosis requires satisfying a three part test: “(1) subaverage intelligence, as
    measured by objective standardized IQ tests; (2) significant impairment in
    several areas of adaptive skills; and (3) manifestations of this neuro-
    psychological disorder in the developmental stage.” Brumfield (S. Ct.), 135 S.
    Ct. at 2274 (quoting State v. Williams, 
    831 So. 2d 835
    , 854 (La. 2002)). Each
    expert also agreed that the diagnosis of intellectual disability is guided by the
    same relevant psychological and medical texts authored by the American
    Psychiatric Association (APA) and AAIDD. See generally AAIDD, Intellectual
    Disability: Definition, Classification, and Systems of Supports (11th ed. 2010)
    [hereinafter Green Book]; Red Book; AAMR, User’s Guide: Mental Retardation:
    Definition, Classification, and Systems of Supports (10th ed. 2002) [hereinafter
    User’s Guide]; APA, Diagnostic and Statistical Manual of Mental Disorders
    (rev. 4th ed. 2000) [hereinafter DSM-IV-TR]. While the experts agreed on the
    criteria for diagnosing intellectual disability, they disagreed on whether
    Brumfield met those criteria.
    4At the Atkins hearing, the district court heard testimony from six expert witnesses—
    three each for Brumfield and the State—and several other witnesses.
    6
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    1. Brumfield’s Three Expert Witnesses
    The asserted role of Brumfield’s first expert, Stephen Greenspan, Ph.D., 5
    was to educate the court on intellectual disability. While Greenspan did not
    evaluate whether Brumfield was intellectually disabled, the district court held
    that Greenspan “is one of the foremost [intellectual disability] experts in the
    country.” Brumfield 
    II, 854 F. Supp. 2d at 386
    . Greenspan testified generally
    as to the “proper use of the AAIDD’s clinical standards in making diagnoses of
    [intellectual disability].” 
    Id. Beginning with
    the subaverage intelligence prong of the intellectual
    disability test, Greenspan explained that psychologists originally used an IQ
    score of 70 as the cutoff for determining whether an individual had an
    intellectual disability, but because of advances in scientific and statistical
    methods, the AAIDD uses “75 as the upper ceiling now” for a diagnosis of
    intellectual disability. Commenting on potential factors that may affect the
    validity of an individual’s IQ score, Greenspan explained that if an individual
    is “malingering,” which refers to intentionally performing poorly on a test, an
    IQ test score may not be valid. He further explained that consistently receiving
    the same IQ score across multiple tests generally rules out malingering by an
    individual.     When Greenspan examined the IQ scores from Brumfield’s
    previous tests, the scores “[told him] that [the test subject] here . . . clearly
    me[t] prong one because all of these scores [we]re in the mild [intellectual
    disability] range.” Greenspan also noted that an individual’s IQ tends to
    remain stable over time, implying that Brumfield, absent some incident that
    lowered his IQ, has always had an IQ in the intellectually disabled range.
    5Greenspan is a licensed psychologist, obtained his Ph.D. in 1976, and (at the time of
    the hearing), was employed as a visiting professor at the University of Colorado Medical
    School. The district court accepted him as an expert in intellectual disability and adaptive
    behavior. Brumfield 
    II, 854 F. Supp. 2d at 386
    .
    7
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    When discussing the second prong of the intellectual disability test—
    whether an individual has impairments in adaptive behavior 6—Greenspan
    explained that “adaptive functioning usually would determine whether
    somebody is really [intellectually disabled]” when a person’s IQ is close to the
    cutoff for an intellectual disability diagnosis. “Adaptive behavior has to do
    with how one functions in the real world . . . outside of the testing situation.”
    Adaptive behavior includes three domains: the practical domain, the social
    domain, and the conceptual domain. The practical domain concerns daily
    living skills, the social domain concerns whether an individual can conform to
    the rules of society, and the conceptual domain concerns quasi-academic skills
    applicable to the real world, such as telling time. A diagnosis of intellectual
    disability requires “at least one . . . major domain of a relative impairment.”
    However, Greenspan was careful to note that an impairment in one domain of
    adaptive behavior does not require the complete absence of adaptive behaviors
    in that domain and that it does not preclude the possibility that an individual
    possesses some strengths in particular areas.
    To measure adaptive behavior in an individual, psychologists administer
    tests,       such   as   the   Adaptive   Behavior      Assessment       System     (ABAS)
    questionnaires, to people who know or knew the individual being evaluated for
    an intellectual disability. Greenspan emphasized that “the more people you
    can talk to, the better picture you get of an individual.” He also noted the
    importance of interviewing the subject himself. Greenspan testified that when
    sufficient records are available, reviewing all of the available information can
    shed light on whether an individual has deficits in adaptive functioning. He
    further noted that reviewing records is important when evaluating whether an
    “Adaptive behavior,” “adaptive functioning,” and “adaptive skills” are used
    6
    interchangeably in both professional psychology circles and during the district court’s Atkins
    hearing.
    8
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    individual satisfies the third prong of an intellectual disability diagnosis—
    manifestations prior to the age of 18. Additionally, Greenspan explained that
    the presence or absence of “maladaptive behavior” is not relevant to the
    diagnosis of intellectual disability. Maladaptive behavior involves a “person
    act[ing] out” by, for example, “attack[ing] other people” and is “not used
    diagnostically.”
    Brumfield’s second expert, Ricardo Weinstein, Ph.D., 7 evaluated
    Brumfield for intellectual disability.            During the course of his evaluation,
    Weinstein met with Brumfield on at least three separate occasions for between
    five and seven hours each time, administered psychological tests, and
    performed a clinical interview with Brumfield. Weinstein also reviewed school
    records, medical records, and other records relevant to Brumfield’s past.
    Finally, Weinstein interviewed at least 14 different individuals who knew
    Brumfield.      Based on his evaluation, Weinstein diagnosed Brumfield as
    intellectually disabled.
    Focusing on the first criterion for intellectual disability, Weinstein
    administered two IQ tests to Brumfield in 2007. 
    Id. at 389.
    Brumfield scored
    a 72 (95% confidence interval of 69–77) on the Stanford-Binet V and a 70 (95%
    confidence interval of 65–75) on the C-TONI. Both of these scores fall within
    the intellectually disabled range and thus meet the first prong of the
    intellectual disability test. Weinstein also noted that Brumfield’s scores on
    previous IQ tests were consistent with an intellectual disability diagnosis. 8
    7  Weinstein received his Ph.D. in 1971, and at the time of the hearing, he practiced
    forensic psychology. The district court accepted him as an expert in intellectual disability
    and forensic neuropsychology. 
    Id. Although the
    State questioned his credentials, correctly
    pointing out that he received his Ph.D. from a non-traditional school that is no longer in
    operation, we note that he is licensed by the State of California and completed a post-doctoral
    certificate at the Fielding Institute.
    8 Based on other psychological testing, Weinstein ruled out malingering as a possible
    explanation for Brumfield’s IQ scores.
    9
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    Specifically, a 1995 administration of the WAIS-R by then-defense expert Dr.
    Bolter resulted in a score of 75 (95% confidence interval of 70–80), and a 2009
    administration of the WAIS-IV by State’s expert Dr. Hoppe yielded a score of
    70 (95% confidence interval of 67–75). Because all four of Brumfield’s full-scale
    IQ scores fell within the intellectually disabled range, Weinstein concluded
    that Brumfield had satisfied the first requirement for an intellectual disability
    diagnosis.
    With respect to his evaluation of Brumfield’s adaptive functioning,
    Weinstein explained that his job as a psychologist “is to identify deficits,” and
    not to identify strengths in adaptive behavior, as “the issue . . . of . . . strengths
    is not relevant.” His evaluation of Brumfield’s adaptive functioning included
    his interviews with Brumfield and his review of relevant records. Additionally,
    Weinstein administered ABAS questionnaires to six people who knew
    Brumfield during his developmental years.               However, because Weinstein
    admitted that the results of the ABAS questionnaires were “not very reliable,” 9
    the district court “f[ound] these tests to be of little or no value,” and did not
    rely on them in reaching its conclusion on Brumfield’s intellectual disability.
    
    Id. at 393.
    The court did, however, consider Weinstein’s interviews with the
    people to whom he administered the ABAS questionnaires and at least eight
    other individuals, as well as his review of the records.
    Based on these interviews and his review of school, hospital, and group
    home records, Weinstein “identif[ied] very significant deficits in all three
    domains” of adaptive behavior. First, Weinstein noted that Brumfield was
    9 As Weinstein explained, the ABAS was designed to be used contemporaneously while
    he was “trying to see how Mr. Brumfield functioned prior to the age of 18,” which required
    him to “ask[] people to remember how [Brumfield] functioned” in the past. Because “these
    backward-looking questions rely principally upon the memories of the test-takers regarding
    Brumfield’s abilities dating back 15–20 years,” 
    id. at 393,
    the scores derived from the ABAS
    are not, in Weinstein’s opinion, very reliable.
    10
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    developmentally delayed. For example, Brumfield was “two years behind his
    chronological age in terms of achievement or even grade levels.” Weinstein
    also noted impairment in Brumfield’s “visual motor coordination.”                 In
    particular, “Brumfield’s writing abilities are severely limited.” According to
    Weinstein, to write a letter Brumfield “needs to have a guide” and “uses a piece
    of cardboard that he puts underneath the line” in order to write in a straight
    line. Brumfield “takes . . . a very long time to write a letter”; in fact, a one page
    letter “take[s him] several days to write.” When writing, Weinstein noted,
    Brumfield “gets assistance from people in death row.”
    With respect to Brumfield’s behavior in the community, Weinstein
    testified that after “look[ing] at the records [and] talk[ing] to people,” he
    concluded that Brumfield “had problems with attention” and “with language
    comprehension.” Weinstein also concluded that Brumfield never learned any
    skills that could lead to gainful employment. Although Brumfield quit his job
    in order to sell drugs so that he could make more money, Weinstein stated that
    this did not suggest that Brumfield was able to obtain or maintain gainful
    employment.
    Commenting on the third prong of the intellectual disability inquiry,
    Weinstein noted that many of the adaptive behavior deficits, such as
    Brumfield’s academic progress lagging two years behind his age, were present
    during Brumfield’s developmental years. Although not part of the intellectual
    disability diagnosis, Weinstein pointed to several risk factors present in
    Brumfield’s history that support the conclusion that Brumfield manifested
    symptoms of an intellectual disability before he turned 18.           For example,
    Brumfield’s mother “had psychiatric problems and was being medicated” and
    did not have “access to prenatal care . . . until she was about six months
    pregnant.”
    11
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    Brumfield’s third expert, Victoria Swanson, Ph.D., also evaluated him
    for intellectual disability. 10 Swanson initially reviewed Brumfield’s records,
    particularly his school records, and the reports of other experts. Based on this
    review, she confirmed the earlier diagnosis of intellectual disability. Although
    she did not meet with Brumfield prior to confirming his intellectual disability
    diagnosis, she later met with him for five hours, interviewed people familiar
    with Brumfield during his developmental years, and broadened her review of
    the records. Swanson stated that nothing she reviewed or learned after writing
    her report changed her opinion or diagnosis.
    After reviewing all of the full-scale IQ scores Brumfield had received,
    Swanson opined that all of his scores fell within the range of intellectual
    disability and therefore concluded that Brumfield had satisfied the first prong
    of the intellectual disability test.         Turning to the second prong—adaptive
    behavior—Swanson discussed Brumfield’s educational history extensively. In
    1983, two teachers referred Brumfield for an evaluation within the school
    system. As part of this evaluation, Brumfield took a number of psychological
    tests, which indicated that Brumfield was functioning academically between
    20 and 41 months behind his chronological age. 11 Based on the results of this
    evaluation, Brumfield was given the “exceptionality of behavior disorder” and
    10  Swanson is a licensed psychologist in the State of Louisiana, and received her Ph.D.
    from Louisiana State University (LSU) in 1999. She has over 20 years of experience working
    with intellectually disabled patients. She also assisted the Louisiana legislature in drafting
    the bill that eventually became the statute governing intellectual disability at issue in this
    case. The district court accepted Swanson as an expert in intellectual disability and
    psychology.
    11 The Illinois Test for Polylinguistic Abilities indicated that he was functioning at an
    age level 41 months behind his chronological age, the Peabody Picture Vocabulary Test
    indicated Brumfield was 20 months below his chronological age level, and the Woodcock
    Language Proficiency Battery indicated Brumfield lagged approximately 24 months behind
    his chronological age. As measured by the Woodcock-Johnson Psychoeducational Battery in
    1983, Brumfield’s reading level fell into the seventh percentile.
    12
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    placed into a classroom setting appropriate for students with this disorder. 12
    After spending three years in the special education classroom, Brumfield again
    took a number of psychological tests. Explaining these tests, Swanson noted
    that “there hasn’t been any progress academically over the three years that
    [Brumfield] continued to be in [the behavior disorder] class, and he seems to
    have plateaued at about the same grade level.”                  She further opined that
    Brumfield did not make any progress in the behavior disorder classroom
    because he, in fact, suffered from an intellectual disability. Explaining that
    students with behavior disorder typically catch up to their peers once their
    behavioral needs are met, Swanson stated that Brumfield simply plateaued
    between a fourth and sixth grade level, which was “consistent with a person
    with [an intellectual disability] more so than with a person who is just
    behaviorally disordered.”
    Swanson also discussed Brumfield’s reading and writing skills at length.
    She noted that, while in prison, Brumfield possessed both elementary-school-
    level and collegiate dictionaries, but he was only able to effectively use the
    elementary-school-level dictionary.            Discussing his reading ability more
    generally based on her interview with Brumfield, she said “he was able to read
    60 words a minute, which is extremely low for someone his age, but would be
    consistent for someone with a fourth grade reading level trying to read at the
    tenth.”     Based on her evaluation of Brumfield, Swanson opined that “a
    diagnosis of [intellectual disability] would be appropriate for [Brumfield]. He
    12 Swanson explained that individuals can have both a behavior disorder and an
    intellectual disability. Moreover, “[t]here is a high instance of aggression amongst students
    with [intellectual disability]” because they “are being asked to do things that they can’t do,”
    which leads to frustration and aggression. When a student has both a behavior disorder and
    an intellectual disability, she explained, schools often place the student into the behavior
    disorder classroom.
    13
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    meets criteria one; he meets criteria two, and . . . there’s evidence of deficits in
    at least two areas prior to the age of 18.”
    2. The State’s Three Expert Witnesses
    The State’s first expert was Donald Hoppe, Psy.D. 13 Hoppe explained
    that his primary role in evaluating Brumfield “was the administration of IQ
    testing in determining an IQ range.” Hoppe administered the WAIS–IV, which
    is one of the “gold standard” IQ tests, to Brumfield on March 13, 2009. On this
    test, Brumfield obtained a full-scale IQ score of 70 with a 95% confidence
    interval of 67 to 75. Hoppe explained that these “results are not that different
    from the results of Dr. Weinstein’s testing,” suggesting that the IQ scores
    obtained by both Hoppe and Weinstein are credible. Hoppe noted that he
    believed “that these scores represent the low end of what Mr. Brumfield’s
    intellectual range is” because “with more effort, his scores would have been
    higher.” However, Hoppe explicitly agreed that Brumfield meets the first
    requirement of an intellectual disability diagnosis based on the IQ test he
    administered and the previous scores that were consistently between 70 and
    75.
    Although his primary role was to administer IQ testing to Brumfield,
    Hoppe also reviewed the available records from Brumfield’s past and
    commented generally on whether Brumfield is intellectually disabled. 14 Hoppe
    noted that Brumfield had taken an IQ test in 1984, and although no actual
    score was included in the records concerning the test, a report indicated that
    Brumfield scored in the “dull normal” range which implied a score between 80
    13 Hoppe received his doctorate from Baylor University in 1981 and is a licensed
    psychologist in the State of Louisiana. He estimated that he has performed “hundreds, if not
    thousands” of IQ tests over his career. The district court accepted Hoppe as an expert in
    “clinical and forensic psychology.”
    14 Hoppe did not interview anyone familiar with Brumfield. He only reviewed written
    records.
    14
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    and 89. Hoppe further noted that although Brumfield had been evaluated
    previously by psychologists and psychiatrists, he was only diagnosed with
    conduct disorder, 15 never with an intellectual disability.
    Hoppe also discussed Brumfield’s past as it related to the adaptive
    functioning prong of the intellectual disability test. Discussing Brumfield’s
    two videotaped confessions to the police following the murder of Corporal
    Smothers, Hoppe stated that these were “good snapshot[s] of what . . .
    [Brumfield] was functioning like at the time of the crime.” Hoppe noted that
    Brumfield appeared to be quick-thinking and gave a “detailed description of
    the streets in Baton Rouge,” which was not consistent with his having an
    intellectual disability. With respect to the crime itself, Hoppe agreed that it
    was fairly complicated, requiring planning and coordination.                   Hoppe also
    explained that Brumfield’s previous criminal behavior was important to his
    conclusion that Brumfield has no intellectual disability. Brumfield appeared
    to pick “weak victims” in several successive crimes, suggesting that he has the
    capacity to plan and organize.
    Discussing earlier details of Brumfield’s life, Hoppe opined that
    Brumfield’s lack of long-term employment, his lack of a checking account, and
    the fact that he never entered into a contract, could result from Brumfield
    being lazy or the fact that he was only 20 years old when he was arrested. He
    stated that these factors did not necessarily suggest that Brumfield has an
    intellectual disability.     Hoppe also stated that drug dealing is “a form of
    employment” and that selling drugs requires a skill set that is not necessarily
    compatible with an intellectual disability diagnosis.
    15Conduct disorder is, essentially, the childhood version of antisocial personality
    disorder. “The essential feature of conduct disorder is a repetitive pattern of behavior in
    which the basic rights of others or major age-appropriate norms or rules are violated,” i.e.,
    conduct disorder is characterized by aggressive behavior.
    15
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    No. 12-30256
    The State’s second expert, Robert V. Blanche, M.D., 16 testified primarily
    as to whether Brumfield had deficits in adaptive functioning.                   Although
    Blanche evaluated Brumfield for intellectual disability, he had never heard of
    the AAMR/AAIDD, Red Book, Green Book, or User’s Guide before his deposition
    in this case and “was thus unfamiliar with [the AAIDD’s] diagnostic
    definitions.” 17 
    Id. at 388.
    He stated that instead of the AAIDD’s materials and
    definitions, psychiatrists rely on the DSM-IV instead.                In explaining his
    evaluation of Brumfield, Blanche noted that he was not familiar with the
    standard adaptive behavior scales used by psychologists and had received no
    formal training in administering psychological testing.
    In conducting his evaluation, Blanche did not interview anyone other
    than Brumfield himself, noting that he did not “feel that [he] would get reliable
    information” from such interviews.           Therefore, beyond his interview with
    Brumfield, Blanche’s inquiry into Brumfield’s adaptive functioning was
    limited to the available written records. In the records Blanche reviewed, there
    was no diagnosis of intellectual disability prior to the Atkins hearing despite
    multiple evaluations by psychologists and psychiatrists in the past. Blanche
    explained that Brumfield’s case was “a classic case of conduct disorder” and
    noted that, while many of the psychologists and psychiatrists who had
    previously evaluated Brumfield had diagnosed him with some form of conduct
    disorder, none of them had diagnosed him with an intellectual disability.
    Reviewing Brumfield’s records from the several group homes where he
    resided over the years, Blanche recalled a number of reports that Brumfield
    participated in sports and other group activities. Assessing the two videotaped
    16  Blanche received his M.D. from LSU Medical School in 1981 and, at the time of the
    hearing, worked part time as a psychiatrist in the East Baton Rouge Parish jail, where he
    identified prisoners in need of mental health care. The district court accepted him as an
    expert in forensic psychiatry.
    17 Blanche admitted this in a deposition that took place in January 2010.
    16
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    No. 12-30256
    confessions Brumfield gave to the police following Corporal Smothers’ murder,
    Blanche noted that Brumfield had no problems explaining himself to the police
    even in the face of complex questions. Based on Brumfield’s description of the
    events leading up to Smothers’ murder, Blanche concluded that the crime
    clearly involved planning, as Brumfield “scoped out [the] situation.”
    Additionally, Blanche explained that Brumfield’s other behaviors in the
    community, though often illegal, also demonstrated his adaptive behavior. For
    example, Brumfield chose to deal drugs instead of working a typical job not
    because he was unable to work a typical job but because dealing drugs was
    more lucrative. Similarly, Brumfield was able to “rent” a car by offering its
    owner drugs in exchange for the use of the car. Based on his review of the
    available records, Blanche concluded that, “to a reasonable medical certainty,
    [Brumfield] is not [intellectually disabled].”
    Despite this conclusion, Blanche admitted, on cross-examination, that
    “[Y]eah. I think he has some weaknesses. And in adaptive functioning that
    there are some—there are some, I will call it deficient. But to how significant
    they are, is, I think, a question.” He further agreed that Brumfield possesses
    weaknesses in several domains of adaptive functioning. Identifying specific
    weaknesses, Blanche stated that Brumfield’s impulsivity fits into the social
    domain of adaptive behavior and his inability to follow rules fits into the
    practical domain of adaptive behavior.
    The State’s final expert, John Bolter, Ph.D., 18 had previously evaluated
    Brumfield in 1995, written a report based on that evaluation, and testified in
    the penalty phase of Brumfield’s original trial. However, all of Bolter’s original
    records and raw data from his 1995 evaluation were destroyed. Bolter stated
    18 Bolter received his Ph.D. from the University of Memphis, and at the time of the
    hearing was a practicing clinical neuropsychologist.
    17
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    No. 12-30256
    he remembered little about Brumfield’s 1995 evaluation and did not
    independently recall which materials he reviewed as part of that evaluation.
    Over Brumfield’s objection, the court accepted Bolter as an expert but
    restricted his testimony to the scope of his 1995 report. 
    Id. at 388.
          In   preparing     his   report,    Bolter    administered     “a   standard
    neuropsychological battery of tests to explore . . . brain function, assessing
    things such as visual spatial skills, language functioning, memory abilities,
    conceptual or executive functions, motor functions, and basic sensory
    perception functions.” Based on the tests he ran, Bolter “didn’t see any clear
    evidence of organic brain dysfunction.” He “saw that [Brumfield] had what
    [Bolter] thought was an attention deficit hyperactivity disorder and . . .
    nonspecific learning difficulties . . . borderline intellectual functioning, and . .
    . an antisocial personality.” Bolter also administered the WAIS-R to Brumfield
    to measure his IQ. His full-scale IQ score was “in the range of 75” which put
    Brumfield in the “borderline mentally defective range.” Based on this test and
    all of the information available to him in 1995, Bolter did not diagnose
    Brumfield with an intellectual disability.
    3. Other Witnesses and Expert Materials
    In addition to its three experts, the State called five other witnesses to
    testify at Brumfield’s Atkins hearing. Warrick Dunn was Corporal Smothers’
    oldest son. Dunn met with Brumfield on October 23, 2007. Commenting on
    Brumfield’s verbal abilities, Dunn stated that the two of them “had a
    conversation like two adults” and agreed that Brumfield was able to express
    himself well.    Jerry Callahan, a retired Baton Rouge Police Department
    lieutenant, was the lead investigator of Corporal Smothers’ murder. Callahan
    interrogated Brumfield and was responsible for videotaping Brumfield’s two
    confessions. Callahan stated that during the five hours he spent with
    Brumfield, Brumfield never had any problems communicating and, in fact,
    18
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    No. 12-30256
    “communicated easily.” None of the State’s final three witnesses testified
    substantively on Brumfield’s intellectual disability.
    In addition to his three testifying experts, Brumfield also relied on a
    report compiled by James Merikangas, M.D. 19                 In his report, Merikangas
    stated that a neurological examination of Brumfield revealed no acquired brain
    damage or ongoing disease. The district court recognized that the implication
    of this report is that Brumfield’s cognitive deficiencies stem from an underlying
    disability, as no physical damage to Brumfield’s brain explains his problems.
    Additionally, the report implies that these deficiencies have been present for
    the entirety of Brumfield’s life, as no physical damage occurring after his
    developmental years explains his problems.
    4. The District Court’s Conclusion on Intellectual Disability
    Beginning with the first prong of the intellectual disability test, the
    district court found that, based on its analysis of Louisiana law and the mental
    health literature, “an IQ score of 75 or below does not preclude a finding of mild
    [intellectual disability] for Atkins purposes.” Brumfield 
    II, 854 F. Supp. 2d at 389
    . After listing Brumfield’s scores on previous IQ tests, the court explained
    that his “scores consistently show him scoring between 70 and 75 on various
    IQ tests, a range which falls squarely within the upper bounds of mild
    [intellectual disability] according to the AAIDD's clinical definition.” 
    Id. at 389–90.
    Further, the court noted that “[e]very expert that has testified in this
    matter has admitted that Brumfield meets the intellectual functioning prong
    of the [intellectual disability] test as set forth in La.C.Cr.P. art. 905.5.1(H)(1).”
    
    Id. at 390.
          Turning to the second prong and relying on the Red Book, the court
    explained that “Prong Two involves an assessment of Brumfield's adaptive
    19   Merikangas received his M.D. in 1969 and is board certified in neuropsychiatry.
    19
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    No. 12-30256
    skills in the areas of conceptual, social, and practical skills” and that “[h]e must
    show a significant limitation in at least one of those three domains to satisfy
    the adaptive skills prong.” 
    Id. at 392
    (citing Red 
    Book, supra, at 14
    ). “Without
    reliable standardized measures available, the [district c]ourt [relied] on the
    testimony of the expert witnesses and their reports, the [c]ourt’s independent
    evaluation of Brumfield’s social, educational, medical, and criminal histories,
    and a common sense appraisal of Brumfield’s actions and abilities.” 
    Id. at 393.
    In doing so, the district court remained cognizant that an intellectual disability
    “is ruled in by areas of impairment but is not ruled out by areas of competence”
    and that “‘people with [intellectual disabilities] are complex human beings’
    who may have ‘strengths in one aspect of an adaptive skill in which they
    otherwise show an overall limitation.’” 
    Id. (quoting Red
    Book, supra, at 8
    ). The
    court further noted that it “must take into account the retrospective diagnostic
    guideline admonishing practitioners to ‘not use past criminal behavior or
    verbal behavior to infer [a] level of adaptive behavior.’” 
    Id. (quoting Red
    Book,
    supra, at 22
    ). However, the court recognized the “propensity of Louisiana
    courts to take such maladaptive criminal behavior into account when
    discussing the adaptive skills prong of the [intellectual disability] test.” 
    Id. at 394.
           “With these important precepts in mind,” the district court evaluated
    each of the three domains of adaptive behavior under the AAIDD guidelines.
    
    Id. at 396.
        The court began with the conceptual skills, or “functional
    academics,” domain. 
    Id. First, the
    court found that “Brumfield's writing
    abilities are severely limited,” as he “cannot write freehand” and “takes an
    inordinate amount of time to write a simple, one-page letter.” 
    Id. Second, Brumfield
    does not have adequate reading abilities, as he reads at “a fourth
    grade level.”    
    Id. Third, “Brumfield
    has a dismal record of academic
    accomplishments in the classroom.” 
    Id. And Brumfield
    “reached a plateau
    20
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    No. 12-30256
    somewhere between the fourth and sixth grade, which is where mildly
    [intellectually disabled] individuals generally fall.” 
    Id. Based on
    the procedural posture of this case, the district court noted that
    it was required to “view, more or less in isolation, whether Brumfield [met] the
    clinical criteria.” 
    Id. at 401.
    In weighing the credibility of the experts in this
    case, the district court ultimately found the testimony of Weinstein and
    Swanson more credible than the testimony of Blanche on the second prong of
    the intellectual disability test. 20 
    Id. Blanche “lacked
    basic knowledge about
    the AAIDD’s standards until he was deposed in this case shortly before the
    hearing.” 
    Id. Blanche also
    “failed to conduct interviews with anyone other
    than Brumfield himself, which [ran] afoul of the basic guidelines for
    retrospective diagnoses.” 
    Id. Beyond the
    expert testimony, the court held that
    it could not “accord great weight to the facts of the crime, even though they
    must be taken into account, because the diagnostic guidelines for assessing
    maladaptive behavior as a part of adaptive skills ha[d] not been sufficiently
    shown to be present in th[e] case.” 
    Id. “Ultimately, the
    [district c]ourt f[ound] that, based on the credibility of
    petitioner’s witnesses combined with the documented problems with the bases
    of testimony by the State’s experts, Brumfield [showed] by a preponderance of
    the evidence that he ha[d] significantly limited conceptual skills.” 
    Id. “[O]n balance,
    the evidence [demonstrated that Brumfield met] the AAIDD’s
    definition of [intellectual disability] with respect to the conceptual domain of
    adaptive behavior.”    
    Id. “Because Brumfield’s
    deficit in conceptual skills
    20 The State’s other expert, Hoppe, did not make any determinations on whether
    Brumfield had significant limitations in adaptive behavior.
    21
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    No. 12-30256
    satisfie[d] Prong Two of the [intellectual disability] test, the [district c]ourt
    [conducted] only a brief review of the other two domains.” 21 
    Id. The district
    court next addressed the final prong of the intellectual
    disability test: whether the disability manifested prior to age 18. 
    Id. at 403.
    The court credited Weinstein’s unrebutted testimony that “there is no question
    that [Brumfield] had very serious problems from very early on in life.” 
    Id. Swanson reached
    a similar conclusion in her report. 
    Id. Merikangas evaluated
    Brumfield in 2007 and concluded that he had no “acquired brain damage or
    ongoing disease that might negate the existence of an organic reason for
    Brumfield’s [intellectual disability].”          
    Id. While Brumfield
    was evaluated
    during his youth by “no less than six doctors,” none of whom diagnosed him as
    intellectually disabled, “Swanson [gave] the [c]ourt a compelling reason to not
    draw a negative inference due to the lack of childhood diagnosis.” 
    Id. at 403–
    04.
    Additionally, “[e]tiological factors appear[ed] to bolster the conclusion
    that Brumfield was and is [intellectually disabled].” 22 
    Id. at 404.
    Weinstein
    testified that Brumfield’s mother “took psychotropic medication during her
    pregnancy” and that Brumfield weighed only “three and a half pounds” and
    suffered fetal distress at birth. 
    Id. “The etiological
    risk factors, along with
    21  Analyzing the social skills domain, the court found that “[o]n balance, this domain
    [was] a close call, but [it] d[id] not find Brumfield [met] the criteria for a significant overall
    deficit in the domain of social skills.” 
    Id. at 402.
    Considering the practical skills domain,
    the court found that “Brumfield ha[d] not met his burden of showing he ha[d] significant
    deficits in practical skills.” 
    Id. at 403.
             22 As Greenspan explained, “[e]tiology has to do with cause and effect or things that
    put the person at risk that could explain why he became [intellectually disabled].” Greenspan
    further explained that “for the most part, when we talk about etiology, we are talking about
    something biological,” such as “an infection or a brain malformation that came about in utero
    . . . [or] some physical cause that organically places the person at risk” of developing an
    intellectual disability. Environmental causes of intellectual disability also exist, such as
    severe child abuse; and some etiological risk factors are both environmental and biological
    such as “oxygen deprivation at birth, or a low birth weight.”
    22
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    No. 12-30256
    Brumfield’s school and medical records, indicate[d] that his mental health
    problems and developmental delays occurred prior to adulthood.” 
    Id. at 405.
    “Based on the showing of substantial intellectual functioning and adaptive
    behavior deficiencies detailed above, the [district c]ourt credit[ed] the
    testimony of Brumfield’s experts and f[ound that] Brumfield ha[d] met his
    burden to show by a preponderance of the evidence that those deficits occurred
    before he turned 18.” 
    Id. Because the
    district court concluded that Brumfield
    was intellectually disabled, it granted his petition for a writ of habeas corpus,
    rendering him ineligible for execution. 
    Id. at 405–06.
       C. Proceedings in the Fifth Circuit and Supreme Court
    The State timely appealed the district court’s grant of the writ to this
    court. Brumfield (5th 
    Cir.), 744 F.3d at 922
    . This court reversed the district
    court, concluding that Brumfield’s habeas petition did not satisfy either of
    § 2254(d)’s requirements.    
    Id. at 927.
    First, because this court determined
    that none of the Supreme Court’s precedents required a state court to grant an
    Atkins petitioner funds to develop his claim, it rejected the district court’s
    conclusion that the state court had unreasonably applied clearly established
    federal law. 
    Id. at 925–26.
    Second, because this court’s “review of the record
    persuade[d it] that the state court did not abuse its discretion when it denied
    Brumfield an evidentiary hearing,” it held that the state court’s decision did
    not rest on an unreasonable determination of the facts. 
    Id. at 926.
    Having
    concluded that Brumfield failed both of the requirements of 28 U.S.C.
    § 2254(d), this court did not review the district court’s determination that
    Brumfield was intellectually disabled. 
    Id. at 927.
    However, in a footnote, this
    court noted that “[e]ven if we were to consider the new evidence presented to
    the district court, we likely would hold that Brumfield failed to establish an
    Atkins claim.” 
    Id. at 927
    n.8.
    23
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    The Supreme Court granted certiorari and vacated this court’s decision
    on June 18, 2015, in a 5–4 decision. Brumfield (S. 
    Ct.), 135 S. Ct. at 2283
    . The
    Court explained that to obtain an Atkins evidentiary hearing, a defendant in
    Louisiana must “put forward sufficient evidence to raise a ‘reasonable ground’
    to believe him to be intellectually disabled.” 
    Id. at 2274
    (citing 
    Williams, 831 So. 2d at 861
    ). The Court held that the state court’s refusal to grant Brumfield
    an Atkins hearing rested on two unreasonable factual determinations that
    related directly to the three-part test for intellectual disability. 
    Id. at 2276–
    82. First, the Court noted that “the state court apparently believed” that
    Brumfield’s IQ score of 75 and an expert witness’s testimony that he “may have
    scored higher on another test . . . belied the claim that Brumfield was
    intellectually disabled because they necessarily precluded any possibility that
    he possessed subaverage intelligence.”       
    Id. at 2277.
       However, the Court
    explained, “this evidence was entirely consistent with intellectual disability.”
    
    Id. The Court
    further explained—relying on its prior decision in Hall v.
    Florida, 
    134 S. Ct. 1986
    (2014), and Louisiana statutory law and caselaw—
    that “Brumfield’s reported IQ test result of 75 was squarely in the range of
    potential intellectual disability.” 
    Id. at 2278.
    “To conclude . . . that Brumfield’s
    reported IQ score of 75 somehow demonstrated that he could not possess
    subaverage intelligence therefore reflected an unreasonable determination of
    the facts.” 
    Id. Second, the
    Court held that the state court unreasonably determined
    that “the record failed to raise any question as to Brumfield’s ‘impairment . . .
    in adaptive skills.’” 
    Id. at 2279.
    Even under the interpretation of the second
    prong of the intellectual disability test “most favorable to the State,” the Court
    held that it was unreasonable for the state court to conclude that Brumfield
    lacked deficits in adaptive behavior.      
    Id. at 2279–81.
       The Court noted a
    number of examples of Brumfield’s deficits in the state trial court record. 
    Id. 24 Case:
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    No. 12-30256
    at 2279–80. For example, when Brumfield was born, he had a low birth weight
    and “slower responses than other babies.” 
    Id. at 2279.
    Brumfield was placed
    “in special classes in school and in multiple mental health facilities.” 
    Id. One report
    from one of these facilities “questioned his intellectual functions,” and
    Dr. Bolter noted that Brumfield had only a “fourth-grade reading level . . . with
    respect to ‘simple word recognition,’” and did not even reach that level with
    respect to “comprehension.” 
    Id. at 2280.
    “All told,” the Court concluded, “the
    evidence in the state-court record provided substantial grounds to question
    Brumfield’s adaptive functioning” because “[a]n individual, like Brumfield,
    who was placed in special education classes at an early age, was suspected of
    having a learning disability, and can barely read at a fourth-grade level,
    certainly would seem to be deficient in both ‘[u]nderstanding and use of
    language’ and ‘[l]earning.’” 23 
    Id. (alteration in
    original) (citation omitted).
    Finally, with respect to the third prong of the test, the Court noted that
    “the state trial court never made any finding that Brumfield had failed to
    produce evidence suggesting he could meet this age-of-onset requirement.” 
    Id. at 2282.
    Therefore, there was no “determination on that point to which a
    federal court had to defer in assessing whether Brumfield satisfied § 2254(d).”
    
    Id. The Court
    noted that “[i]f Brumfield presented sufficient evidence to
    suggest that he was intellectually limited, as we have made clear he did, there
    is little question that he also established good reason to think that he had been
    23   The Court also noted that:
    An individual who points to evidence that he was at risk of “neurological
    trauma” at birth, was diagnosed with a learning disability and placed in special
    education classes, was committed to mental health facilities and given
    powerful medication, reads at a fourth-grade level, and simply cannot “process
    information,” has raised substantial reason to believe that he suffers from
    adaptive impairments.
    
    Id. at 2281.
                                                  25
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    so since he was a child.” 
    Id. at 2283.
    Based on its conclusion that the state
    trial court decision “was based on an unreasonable determination of the facts
    in light of the evidence,” 28 U.S.C. § 2254(d)(2), the Supreme Court held that
    “Brumfield ha[d] satisfied the requirements of § 2254(d).” Brumfield (S. 
    Ct.), 135 S. Ct. at 2283
    . Accordingly, the Court reversed the judgment of this court
    and remanded the case for further proceedings. 
    Id. The sole
    remaining issue
    on remand is whether the district court clearly erred when it found Brumfield
    was intellectually disabled, as the Supreme Court held that Brumfield had
    satisfied § 2254(d) and that Brumfield “was therefore entitled to have his
    Atkins claim considered on the merits in federal court.” 
    Id. at 2273.
                                 II. STANDARD OF REVIEW
    “[T]he determination of whether a defendant is [intellectually disabled]
    is inherently an intensively factual inquiry.” State v. Williams, 
    22 So. 3d 867
    ,
    887 (La. 2009); see also State v. Turner, 
    936 So. 2d 89
    , 98 (La. 2006). Because
    intellectual disability is a factual finding, this court reviews a district court’s
    determination that an individual is intellectually disabled for clear error. 24
    Rivera v. Quarterman, 
    505 F.3d 349
    , 361 (5th Cir. 2007).
    “A finding is clearly erroneous only if it is implausible in the light of the
    record considered as a whole.” 
    Id. (quoting St.
    Aubin v. Quarterman, 
    470 F.3d 1096
    , 1101 (5th Cir. 2006)); see also Anderson v. City of Bessemer City, 
    470 U.S. 564
    , 573 (1985) (“[A] finding is ‘clearly erroneous’ when although there is
    evidence to support it, the reviewing court on the entire evidence is left with a
    definite and firm conviction that a mistake has been committed.” (quoting
    United States v. United States Gypsum Co., 
    333 U.S. 364
    , 394–95 (1948))). “If
    24The State never mentions the standard of appellate review in its brief, and despite
    direct questions at oral argument, the State refused to acknowledge the appropriate standard
    of review. In its brief and also at oral argument, the State argued that the district court
    refused to introduce the state trial court record into evidence when, in fact, the district court
    allowed the State to introduce the vast majority of the state court record into evidence.
    26
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    No. 12-30256
    the district court’s account of the evidence is plausible in light of the record
    viewed in its entirety, the court of appeals may not reverse it even though
    convinced that had it been sitting as the trier of fact, it would have weighed
    the evidence differently.” 
    Anderson, 470 U.S. at 573
    –74. “Where there are two
    permissible views of the evidence, the factfinder’s choice between them cannot
    be clearly erroneous.” 
    Id. at 574.
    The Supreme Court has explained that:
    [W]hen a trial judge’s finding is based on his decision to credit the
    testimony of one of two or more witnesses, each of whom has told
    a coherent and facially plausible story that is not contradicted by
    extrinsic evidence, that finding, if not internally inconsistent, can
    virtually never be clear error.
    
    Id. at 575.
    This court “cannot second guess the district court’s decision to
    believe one witness’ testimony over another’s or to discount a witness’
    testimony,” and is thus “reluctant to set aside findings that are based upon a
    trial judge’s determination of the credibility of witnesses.” Canal Barge Co. v.
    Torco Oil Co., 
    220 F.3d 370
    , 375 (5th Cir. 2000).
    III. INTELLECTUAL DISABILITY
    Although the determination of whether an individual has an intellectual
    disability under Atkins is necessarily a question for the court to decide, this
    determination is heavily informed by clinical standards and guidelines.         In
    Atkins, when the Supreme Court left to states the task of implementing its
    holding that intellectually disabled individuals may not be executed, it cited
    with approval the clinical standards of the AAIDD and APA. 
    Atkins, 536 U.S. at 308
    –09, 317. The Supreme Court of Louisiana first implemented the Atkins
    mandate in 
    Williams, 831 So. 2d at 835
    . Noting that the Atkins Court adopted
    a “‘clinical definition’ of [intellectual disability],” the Supreme Court of
    Louisiana explicitly relied on the definition of intellectual disability developed
    by the AAIDD and the APA in crafting the test for intellectual disability. 
    Id. at 852.
                                           27
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    Following Atkins and Williams, Louisiana enacted a statute providing
    that “[n]otwithstanding any other provisions of law to the contrary, no person
    who is [intellectually disabled] shall be subjected to a sentence of death.” La.
    Code Crim. Proc. Ann. art. 905.5.1(A). The statute defining intellectual
    disability at the time of the Atkins hearing provided as follows:
    (1)“[Intellectual disability]” means a disability characterized by
    significant limitations in both intellectual functioning and
    adaptive behavior as expressed in conceptual, social, and practical
    adaptive skills. The onset must occur before the age of eighteen
    years.
    La. Code Crim. Proc. Ann. art. 905.5.1(H). 25                As Swanson stated in her
    testimony and as the district court noted, this definition tracks the Red Book’s
    definition of intellectual disability. The Red Book provides that “[intellectual
    25The Louisiana legislature amended the statute in June 2014, which currently reads
    as follows:
    A. Notwithstanding any other provisions of law to the contrary, no person with
    an intellectual disability shall be subjected to a sentence of death.
    ...
    H. (1) “Intellectual disability”, formerly referred to as “mental retardation”, is
    a disability characterized by all of the following deficits, the onset of which
    must occur during the developmental period:
    (a) Deficits in intellectual functions such as reasoning, problem
    solving, planning, abstract thinking, judgment, academic
    learning, and learning from experience, confirmed by both
    clinical    assessment      and    individualized,    standardized
    intelligence testing.
    (b) Deficits in adaptive functioning that result in failure to meet
    developmental and sociocultural standards for personal
    independence and social responsibility; and that, without
    ongoing support, limit functioning in one or more activities of
    daily life including, without limitation, communication, social
    participation, and independent living, across multiple
    environments such as home, school, work, and community.
    La. Code Crim. Proc. Ann. art. 905.5.1. The district court relied on the older version of the
    statute, and we do the same here. However, we note that while the new statute is worded
    differently, the test for intellectual disability remains largely unchanged.
    28
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    No. 12-30256
    disability] is a disability characterized by significant limitations both in
    intellectual functioning and in adaptive behavior as expressed in conceptual,
    social, and practical adaptive skills,” and that “[t]his disability originates
    before age 18.” Red 
    Book, supra, at 1
    . Since this statute was enacted, the
    Supreme Court has reiterated that “[t]he clinical definitions of intellectual
    disability . . . were a fundamental premise of Atkins.” 
    Hall, 134 S. Ct. at 1999
    .
    In this case, the Supreme Court again cited with approval the clinical
    guidelines on intellectual disability. Brumfield (S. 
    Ct.), 135 S. Ct. at 2274
    ,
    2278. Therefore, the district court properly relied on the clinical guidelines of
    the AAIDD and APA in assessing whether Brumfield satisfied the statutory
    test for intellectual disability, and we similarly look to these guidelines in our
    review of the district court’s decision. In reviewing the district court’s decision,
    we address seriatim the three prongs of the test for intellectual disability.
    A. First Prong: Intellectual Functioning
    The assessment of an individual’s intellectual functioning requires the
    administration of standardized intelligence testing.             “The ‘significant
    limitations in intellectual functioning’ criterion for a diagnosis of intellectual
    disability is an IQ score that is approximately two standard deviations below
    the mean, considering the standard error of measurement for the specific
    instruments used.” Green 
    Book, supra, at 31
    ; accord Red 
    Book, supra, at 58
    (“[T]he ‘intellectual functioning’ criterion for diagnosis of [intellectual
    disability] is approximately two standard deviations below the mean,
    considering the [standard error of measurement] for the specific assessment
    instruments used.”).      As Greenspan explained, IQ tests are normalized so
    that the mean score is 100 and the standard deviation is 15; thus, two standard
    deviations below the mean equates to a score of 70. This is consistent with the
    assessment of Louisiana law by the Supreme Court of the United States, as it
    explained that, “[t]o qualify as ‘significantly subaverage in general intellectual
    29
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    No. 12-30256
    functioning’ in Louisiana, ‘one must be more than two standard deviations
    below the mean for the test of intellectual functioning.’” Brumfield (S. 
    Ct.), 135 S. Ct. at 2277
    (quoting 
    Williams, 831 So. 2d at 853
    ).
    Although a score of 70 is two standard deviations below the mean score,
    both the Supreme Court of the United States and the Louisiana Supreme Court
    have rejected a bright-line numerical cutoff for intellectual disability. See 
    Hall, 134 S. Ct. at 1996
    ; 
    Williams, 22 So. 3d at 888
    . As the Supreme Court of the
    United States explained in Hall, “[t]he concept of standard deviation describes
    how scores are dispersed in a population,” but “[s]tandard deviation is distinct
    from standard error of measurement, a concept which describes the reliability
    of a 
    test.” 134 S. Ct. at 1994
    . The Court further explained that the standard
    error of measurement “reflects the reality that an individual’s intellectual
    functioning cannot be reduced to a single numerical score.”           
    Id. at 1995.
    Therefore, “an individual’s score is best understood as a range of scores on
    either side of the recorded score.” 
    Id. Thus, scores
    higher than 70 can satisfy
    the first prong of the intellectual disability test. The Supreme Court in Hall
    explicitly rejected the contention that an IQ score of 75 precludes the
    possibility of an intellectual disability diagnosis. 
    Id. at 1996.
    Similarly, the
    Louisiana Supreme Court in State v. Dunn (Dunn III), 
    41 So. 3d 454
    , 470 (La.
    2010), stated that “[t]he ranges associated with the two scores of 75 brush the
    threshold score for [an intellectual disability] diagnosis.”        Moreover, the
    AAIDD recognizes that a score of 75 is consistent with an intellectual
    disability. Red 
    Book, supra, at 59
    ; see also 
    DSM-IV-TR, supra, at 41
    –42.
    In this case, the district court concluded that Brumfield satisfied the first
    prong of the intellectual disability test based on his IQ scores. As found by the
    district court, Brumfield’s IQ test scores were as follows:
    30
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    No. 12-30256
    — In a 1995 WAIS–R test administered by then-defense expert Dr.
    Bolter, he scored a 75, with a 95% confidence interval of 70–80.
    — In a 2007 Stanford–Binet V test administered by petitioner’s
    expert, Dr. Weinstein, he scored a 72, with a 95% confidence
    interval of 69–77.
    — In a 2007 C–TONI test administered by Dr. Weinstein, he
    scored a 70, with a 95% confidence interval of 65–75.
    — In a 2009 WAIS–IV test administered by the State’s expert, Dr.
    Hoppe, he scored a 70, with a 95% confidence interval of 67–75.
    Brumfield 
    II, 854 F. Supp. 2d at 389
    –90. All four of the confidence intervals
    (the range of scores calculated from the standard error of measurement)
    surrounding Brumfield’s full-scale IQ scores include scores of 70 or below, and
    therefore satisfy the first prong of the intellectual disability test based on how
    both the Supreme Court and Supreme Court of Louisiana have analyzed IQ
    scores in the past. 26 Even ignoring the confidence intervals, no score exceeds
    75, and the Supreme Court noted in Atkins, Hall, and Brumfield (S. Ct.), that
    a score of 75 can satisfy the first prong of the intellectual disability test.
    Brumfield (S. 
    Ct.), 135 S. Ct. at 2278
    ; 
    Hall, 134 S. Ct. at 1996
    ; 
    Atkins, 536 U.S. at 309
    n.5.      Moreover, every single expert agreed that Brumfield’s scores
    satisfied the first prong of the intellectual disability test. 27 As this court noted
    26  Weinstein explained that as long as the lower bound of the confidence interval
    includes a score of 70 or less, an individual can satisfy the first prong of the intellectual
    disability test.
    27 The district court, experts, and parties discussed the import of the “Flynn effect,”
    which describes the phenomenon whereby the American public’s score on any given IQ test
    increases by approximately three points per decade. Brumfield 
    II, 854 F. Supp. 2d at 391
    .
    “Thus, when an older test is used to measure a test subject, the subject’s IQ score may be
    artificially inflated because that test was normalized using a past sample of Americans.” 
    Id. at 391.
    To correct for the Flynn effect, a test subject’s score may be adjusted downward by
    0.30–0.33 for every year that has elapsed since the test was normalized. 
    Id. The State
    correctly points out that the Fifth Circuit has not recognized the Flynn effect. In re Salazar,
    
    443 F.3d 430
    , 433 n.1 (5th Cir. 2006); see also In re Mathis, 
    483 F.3d 395
    , 398 n.1 (5th Cir.
    2007). It is not necessary to decide whether to recognize the Flynn effect in this case,
    however, as Brumfield’s scores satisfy the first prong of the intellectual disability test without
    a Flynn effect adjustment.
    31
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    in 
    Rivera, 505 F.3d at 361
    , “[a] finding is clearly erroneous only if it is
    implausible in the light of the record considered as a whole.” Given that all of
    Brumfield’s reported IQ scores fell at or below 75 and that the experts’
    conclusions were based on these scores, the district court’s conclusion that
    Brumfield met the first criterion for an intellectual disability diagnosis is not
    implausible and therefore is not clearly erroneous.
    The State argues that “assessments consistently demonstrated that
    Brumfield had an IQ in the 70-85 range.” However, the State does not point
    to specific IQ scores which demonstrate that Brumfield’s IQ fell within this
    range. Presumably, it refers to the tests administered to Brumfield in the
    1980s. As Weinstein explained, no actual IQ scores from these tests were
    reported anywhere in Brumfield’s records; instead, the reports based on these
    IQ tests provided only descriptions of the ranges into which Brumfield’s scores
    fell. For example, Weinstein explained that one report described Brumfield’s
    IQ score as falling into the “dull normal” range, which Weinstein further
    explained corresponded to a score between 80 and 89. The district court’s
    discrediting of this range of scores in favor of reported, full-scale IQ scores was
    not clear error, as the Supreme Court similarly disregarded supposedly higher
    IQ scores when no actual score was provided. See Brumfield (S. 
    Ct.), 135 S. Ct. at 2278
    –79. Moreover, multiple expert witnesses discredited this range of
    scores in favor of the reported scores, and this court “cannot second guess the
    district court’s decision to believe one witness’ testimony over another’s or to
    discount a witness’ testimony.” Canal 
    Barge, 220 F.3d at 375
    .
    The State also argues that Brumfield’s scores may be explained by his
    low effort on the IQ tests. However, the experts in this case—including the
    State’s expert who administered IQ tests—also administered tests for
    malingering and found that Brumfield was, in fact, not malingering. Moreover,
    Greenspan explained that Brumfield’s consistent scores across multiple tests
    32
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    over multiple years ruled out malingering. We decline the State’s invitation to
    second guess the district court’s decision to believe the multiple experts who
    stated that Brumfield’s scores were not a product of malingering. Accordingly,
    we find no clear error in the district court’s finding that Brumfield satisfied the
    first prong of the intellectual disability test.
    B. Second Prong: Adaptive Behavior
    “Adaptive behavior is the collection of conceptual, social, and practical
    skills that have been learned and are performed by people in their everyday
    lives.” Green 
    Book, supra, at 43
    ; see also Red 
    Book, supra, at 73
    . Under the
    AAIDD’s definition, 28 a diagnosis of intellectual disability requires that an
    individual have significant limitations in at least one of the three domains of
    adaptive skills—conceptual, social, and practical skills. 29 Red 
    Book, supra, at 14
    . The district court found that Brumfield showed significant limitations in
    the conceptual domain but not in the social or practical domains. Brumfield
    
    II, 854 F. Supp. 2d at 396
    –403.
    The first deficit the court found in the conceptual domain was
    Brumfield’s writing abilities, as Brumfield could not write in a straight line
    without an aid, took an “inordinate amount of time to write a simple, one-page
    letter,” and relied on the assistance of other inmates when writing letters. 
    Id. at 396.
    In coming to this conclusion, the district court relied on Weinstein’s
    28 The district court correctly noted that, as with the intellectual functioning prong,
    the AAIDD prefers that practitioners employ standardized testing to evaluate adaptive
    functioning. See Red 
    Book, supra, at 76
    . However, utilizing standardized testing, such as
    the ABAS questionnaires administered by Weinstein, is difficult in situations requiring a
    retrospective diagnosis. In these situations, the district court correctly explained that the
    User’s 
    Guide, supra, at 17
    –22, calls for additional inquiry into the subject’s past and
    interviews alongside the types of questionnaires used in situations of contemporaneous
    diagnosis. That additional inquiry and those interviews were conducted by two of Brumfield’s
    experts in this case.
    29 Neither the State nor Brumfield contests the use of the “three domain” test on
    remand. The State structures its argument that Brumfield has no deficits in adaptive skills
    around this test.
    33
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    testimony, and in concluding that the State’s reliance on the “quality of his
    expressions in his prison correspondence is misplaced,” the court credited the
    testimony of Swanson. 
    Id. The court
    next found that Brumfield’s reading
    skills were deficient. 
    Id. The court
    explained that after listening to Brumfield
    read some of his letters, Swanson concluded he read at approximately a fourth
    grade level. 
    Id. Finally, the
    district court found that “Brumfield has a dismal
    record of academic accomplishments.” 
    Id. The court
    relied on the testimony
    of Weinstein, who stated that Brumfield was always behind in school because
    of developmental delays, and Swanson, who noted that Brumfield “reached a
    plateau somewhere between fourth and sixth grade, which is where mildly
    [intellectually disabled] individuals generally fall.” 
    Id. In reaching
    its conclusion that Brumfield demonstrated significant
    limitations in the conceptual skills domain, the district court carefully
    explained its reasoning, identified the specific evidence it relied upon, and
    specifically credited the testimony of certain experts. Because nothing in the
    district court’s reasoning suggests its conclusion “is implausible in the light of
    the record considered as a whole,” 
    Rivera, 505 F.3d at 361
    (quoting St. 
    Aubin, 470 F.3d at 1101
    ), and because this court must give “due regard . . . to the
    opportunity of the trial court to judge of the credibility of the witnesses,”
    
    Anderson, 470 U.S. at 573
    (quoting Fed. R. Civ. P. 52(a)), we hold that the
    district court’s finding is not clearly erroneous. Brumfield was only required
    to demonstrate significant limitations in one of the three domains of adaptive
    behavior to satisfy the legal and clinical tests for intellectual disability. Thus,
    the district court’s finding that Brumfield met “the AAIDD’s definition of
    [intellectual disability] with respect to the conceptual domain of adaptive
    behavior,” Brumfield 
    II, 854 F. Supp. 2d at 401
    , was sufficient for the district
    court to conclude that Brumfield had satisfied the second prong of the
    intellectual disability test.
    34
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    In challenging the district court’s conclusion, the State argues that
    Brumfield’s academic problems, which led to his being placed in special
    education classes, stemmed primarily from his behavior problems and conduct
    disorder, not an intellectual disability. However, the district court credited the
    testimony of Swanson, who explained that, at the time Brumfield attended
    school, school systems were urged to substitute diagnoses of conduct disorder
    for intellectual disability essentially for political reasons. 30              
    Id. at 397.
    Moreover, the Supreme Court noted that “[t]he diagnostic criteria for
    [intellectual disability] do not include an exclusion criterion; therefore, the
    diagnosis should be made . . . regardless of and in addition to the presence of
    another disorder.” Brumfield (S. 
    Ct.), 135 S. Ct. at 2280
    (quoting 
    DSM-IV-TR, supra, at 47
    ).         Both the State and Brumfield tell “coherent and facially
    plausible stor[ies],” 
    Anderson, 470 U.S. at 575
    , as either behavioral problems
    or an intellectual disability could explain all or some of Brumfield’s poor
    academic record. “When ‘the district court is faced with testimony that may
    lead to more than one conclusion, its factual determinations will stand so long
    as they are plausible—even if we would have weighed the evidence otherwise.’”
    Heck v. Triche, 
    775 F.3d 265
    , 284 (5th Cir. 2014) (quoting Nielsen v. United
    States, 
    976 F.2d 951
    , 956 (5th Cir. 1992)); see also 
    Anderson, 470 U.S. at 574
    30   The district court explained that:
    Swanson [gave] the Court a compelling reason to not draw a negative inference
    due to the lack of childhood [intellectual disability] diagnosis. She points out
    that during Brumfield’s school years in the late 1970s, African–Americans
    males were b[e]ing disproportionately diagnosed with [intellectual
    disabilities]. School officials, psychologists, and appraisal teams were
    accordingly cautious not to over-represent black males as being [intellectually
    disabled] and were instead urged to consider other alternatives that would
    avoid placing the [intellectually disabled] label on them. Swanson confirmed
    that East Baton Rouge Parish schools, which Brumfield attended, had received
    this admonition.
    
    Id. at 404.
                                                     35
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    No. 12-30256
    (“Where there are two permissible views of the evidence, the factfinder’s choice
    between them cannot be clearly erroneous.”).
    The State also points to elements of Brumfield’s past that it argues
    demonstrate adaptive functioning.        For example, Blanche testified that
    Brumfield “owned” a car, engaged in cash transactions by renting motel rooms,
    and helped his girlfriend financially. Although the district court acknowledged
    these activities, among others, it explained that “[m]ildly [intellectually
    disabled] people generally have mental ages ranging from seven to eleven,” and
    “[i]t is not inconceivable for someone around the age of ten to have the mental
    capacity” to engage in these types of activities. Brumfield 
    II, 854 F. Supp. 2d at 398
    .
    The State also argues that Brumfield’s activities while in prison belie
    any intellectual disability, as he wrote letters, possessed books (including two
    dictionaries), and explained complex tasks to people over the phone. With
    respect to Brumfield’s writing letters, the district court credited the testimony
    of Weinstein and Swanson that “Brumfield requires assistance from other
    death row inmates to write his letters, . . . and thus the reliance by the States’
    experts on the quality of his expressions in his prison correspondence is
    misplaced.” 
    Id. at 396.
    The court further found that, based on Swanson’s
    testimony, “[t]he reading materials in his prison cell are targeted to middle
    school audiences and are consistent with someone who has [an intellectual
    disability].” 
    Id. Finally, with
    respect to Brumfield’s phone calls, the district
    court found that they were “simply not sufficient to show adaptive strength in
    communication abilities,” and that “one or two instances of him exhibiting oral
    communication skills expected of adults could hardly be said to outweigh the
    other documented adaptive weaknesses in the conceptual domain,” as
    “strengths can coexist alongside weaknesses.”        
    Id. at 399.
      Although the
    evidence emphasized by the State tends to undermine the district court’s
    36
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    conclusion that Brumfield had significant limitations in adaptive functioning,
    we are “not entitle[d to]. . . reverse the finding of the trier of fact” even if we
    “would have weighed the evidence differently.” 
    Anderson, 470 U.S. at 573
    –74.
    Because nothing the State emphasizes establishes that the district court’s
    account of the evidence is implausible, we hold that the district court’s
    finding—that Brumfield’s poor academic performance and his deficiencies in
    reading and writing constitute deficits in adaptive behavior—is not clearly
    erroneous. See 
    id. at 573–74
    (“If the district court’s account of the evidence is
    plausible in light of the record viewed in its entirety, the court of appeals may
    not reverse it even though convinced that had it been sitting as the trier of fact,
    it would have weighed the evidence differently.”).
    Furthermore, we note that the district court’s finding is not clearly
    erroneous because it has more evidentiary support than prior cases in which
    this court upheld a district court’s intellectual disability determination. In
    Wiley v. Epps, 
    625 F.3d 199
    , 219–22 (5th Cir. 2010), this court found no clear
    error when a district court held that petitioner Wiley had an intellectual
    disability based on deficits in functional academic skills, communication, and
    self-direction. In that case, Wiley was evaluated four separate times with
    conflicting results. 
    Id. at 219–21.
    Based on these results and evidence that he
    struggled academically while in the military, the district court found that he
    was deficient in the area of functional academic skills. 
    Id. at 221.
    This court
    refused to reverse the district court because doing so would essentially
    substitute the opinion of the State’s expert for Wiley’s experts. 
    Id. at 218.
    As
    the district court was in a better position to judge the credibility of the experts,
    this court declined to reverse the district court. 
    Id. In Rivera,
    the district court
    found that Rivera had “adaptive limitations,” including “consistent[] . . .
    academic 
    problems.” 505 F.3d at 362
    . After remarking that the district court
    “is in a better position than this court to judge and weigh the credibility of the
    37
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    witnesses who testified,” this court declined to find a clear error. 
    Id. at 363.
    However, neither Wiley nor Rivera involved Louisiana law.
    Dunn III, on the other hand, did involve Louisiana law, and this court
    noted previously that, based on this case, it would likely determine that the
    district court erred in finding Brumfield intellectually disabled, 31 Brumfield
    (5th 
    Cir.), 744 F.3d at 927
    n.8. In that case, the Supreme Court of Louisiana
    reviewed a trial court’s determination that Dunn was not intellectually
    disabled following an Atkins hearing. Dunn 
    III, 41 So. 3d at 455
    –56. Dunn
    had reported IQ scores of 70, 78, and 78. 
    Id. at 462–63.
    Multiple experts
    administered ABAS scales, but like this case, the evidence on Dunn’s adaptive
    behavior conflicted. 
    Id. at 463–70.
    After reviewing that evidence, the court
    noted that “[i]t is also important to consider the defendant’s behavior during
    the planning and commission of the instant crime as it relates to his adaptive
    skills functioning.” 
    Id. at 471.
    In evaluating Dunn’s crime, the court found
    that “the evidence at trial established defendant engaged in the leadership and
    planning of a major bank robbery” and held that the defendant’s planning
    “with its premeditative aspects, clearly lacks the impulsiveness and non-
    31 The State argues that the district court failed to consider other Louisiana cases
    addressing the question of how to factor criminal behavior into an evaluation of an
    individual’s adaptive functioning. However, the court recognized the “propensity of
    Louisiana courts to take such maladaptive criminal behavior into account when discussing
    the adaptive skills prong of the [intellectual disability] test.” Brumfield 
    II, 854 F. Supp. 2d at 394
    . Addressing this propensity, the district court identified five cases where the Supreme
    Court of Louisiana “affirmed on direct appeal a jury’s assessment of death in the penalty
    phase of the trial where the [intellectual disability] issue was actually litigated.” Id.; see
    generally Williams, 
    22 So. 3d 867
    ; State v. Anderson, 
    996 So. 2d 973
    (La. 2008); State v. Lee,
    
    976 So. 2d 109
    (La. 2008); State v. Scott, 
    921 So. 2d 904
    (La. 2006); State v. Brown, 
    907 So. 2d
    1 (La. 2005). However, the district court found these cases distinguishable because the
    Supreme Court of Louisiana was required under Jackson v. Virginia, 
    443 U.S. 307
    (1979), to
    apply a different standard of review than the standard that applies to Atkins hearings.
    Brumfield 
    II, 854 F. Supp. 2d at 394
    . The court found that Dunn III “[was] the only Louisiana
    Supreme Court case on point.” We agree and find no error with the manner in which the
    district court factored Brumfield’s criminal behavior into its analysis of his adaptive
    functioning.
    38
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    leadership interactions associated with [intellectually disabled] persons” based
    on “the firmly established facts of this case.” 
    Id. at 471–72.
           The district court carefully considered this case and concluded that it
    could consider “evidence of the criminal action in the overall assessment if
    ‘firmly established facts’ show[ed] clear instances of premeditation and
    leadership.” Brumfield 
    II, 854 F. Supp. 2d at 395
    . In considering the evidence
    of Brumfield’s criminal activity, the district court concluded that it was not
    sufficient to demonstrate an absence of deficits in the conceptual skills domain,
    
    id. at 398–401,
    and that nothing in the record suggested Brumfield “‘led’ this
    terrible scheme.” 
    Id. at 400.
    The district court further reasoned that even if
    the crime involved planning and premeditation by Brumfield, “this particular
    instance [should not be] sufficient to overwhelm the other demonstrated
    showings of adaptive deficits in conceptual skills.” 
    Id. Beyond the
    facts of Smothers’ murder, the State argues that other
    aspects of Brumfield’s criminal history demonstrate that he does not have
    significant limitations in adaptive functioning. First, the State contends that
    Brumfield’s two confession videos show his composure under pressure, ability
    to lie, and think quickly.       However, the district court credited Swanson’s
    testimony that, in the first tape, Brumfield responded to cues from police and
    that, in the second tape, Brumfield spoke more quickly because he was more
    familiar with the topic at that point.           
    Id. Second, the
    State argues that
    Brumfield’s history of drug dealing and other criminal behavior demonstrates
    his ability to plan, his ability to handle complex transactions, and his adaptive
    functioning generally. 32 Although the State is correct that Brumfield dealt
    drugs in the past, the court noted that “[t]he record is barren of any testimony
    32The State notes that Brumfield demonstrated an ability to choose weak and
    vulnerable victims for his past crimes. We see nothing in the record concerning this ability
    that demonstrates clear error on the part of the district court.
    39
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    regarding his efficacy in drug transactions,” 
    id. at 398,
    and both Greenspan
    and Weinstein testified that Brumfield’s drug dealing was not inconsistent
    with an intellectual disability diagnosis.         Third, the State argues that
    Brumfield’s ability to avoid the police after his crime demonstrates adaptive
    functioning, but the district court found that “[w]hile evading police and
    avoiding capture can exhibit raw physical skills, at other times those acts are
    just as consistent with primal survival instincts as they are with callous, cold-
    blooded calculation.” 
    Id. at 399.
          Overall, the district court considered the facts surrounding Smothers’
    murder as well as Brumfield’s other criminal activities.          Thus, while the
    district court considered similar evidence as the trial court in Dunn III, it
    simply reached a different conclusion. Although this difference in findings
    based on relatively similar evidence certainly weighs against the conclusion
    that Brumfield is intellectually disabled, it does not necessarily demonstrate
    that the district court clearly erred based on the record before it. The Dunn III
    court recognized that trial courts are called on “to make exceedingly fine
    distinctions” between those who are mildly intellectually disabled and those
    who are not. Dunn 
    III, 41 So. 3d at 469
    . We agree with the Dunn III court on
    this point.    Accordingly, we decline to disturb the “exceedingly fine
    distinctions,” 
    id., the district
    court made in this “intensively factual inquiry,”
    
    Williams, 22 So. 3d at 887
    . Even if we were to disagree about how to weigh
    the evidence in this case, the clear error standard “plainly does not entitle a
    reviewing court to reverse the finding of the trier of fact simply because it is
    convinced that it would have decided the case differently.” 
    Anderson, 470 U.S. at 573
    .
    C. Third Prong: Onset during Developmental Years
    The final prong of the intellectual disability test requires that the
    disability manifest before the age of 18. The district court did not clearly err
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    Case: 12-30256     Document: 00513375522      Page: 41   Date Filed: 02/10/2016
    No. 12-30256
    in finding that Brumfield’s disability manifested during his developmental
    years. In fact, one of the principal findings of the district court with respect to
    Brumfield’s deficits in the conceptual skills domain—his poor academic record
    while in school—necessarily involved finding that the disability manifested
    before age 18. Brumfield 
    II, 854 F. Supp. 2d at 396
    . Similarly, the district
    court credited Swanson’s testimony that while in the eighth grade, Brumfield
    read at only a third grade level. 
    Id. Although none
    of the IQ tests was administered to Brumfield prior to the
    age of 18, Greenspan testified that IQ scores remain stable over time.
    Additionally, Merikangas evaluated Brumfield and found no physical problems
    with his brain that would explain his consistent IQ scores between 70 and 75,
    meaning that Brumfield’s disability stems from some underlying problem he
    has had all of his life. Finally, the district court pointed to etiological factors
    such as, inter alia, Brumfield’s low birth weight, fetal distress at birth, and
    family history of intellectual disability.       
    Id. at 404–05.
        Although not
    dispositive, these factors certainly bolster the court’s conclusion that
    Brumfield’s intellectual disability manifested during his developmental years.
    
    Id. at 405.
       D. Expert Credibility and Brumfield’s Medical History
    On remand, the State correctly highlights a number of weaknesses in
    Brumfield’s expert witnesses that undermine their credibility. For example,
    Greenspan never evaluated Brumfield, Weinstein obtained his Ph.D. from an
    unaccredited institution, and Swanson diagnosed Brumfield prior to meeting
    with him. However, the district court explicitly weighed the credibility of
    different witnesses.   
    Id. at 401.
         For example, the court pointed out that
    Blanche “lacked basic knowledge about the AAIDD’s standards until he was
    deposed in this case shortly before the hearing,” 
    id. at 401,
    and that Hoppe
    failed to interview anyone other than Brumfield, 
    id. at 387
    n.21. Giving “due
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    No. 12-30256
    regard” to the “opportunity of the trial court to judge the credibility of the
    witness[es],” 
    Anderson, 470 U.S. at 573
    (quoting Fed. R. Civ. P. 52(a)), we
    decline to disturb the district court’s findings, see also Dunbar Med. Sys. Inc.
    v. Gammex Inc., 
    216 F.3d 441
    , 453 (5th Cir. 2000) (“The burden of showing that
    the findings of the district court are clearly erroneous is heavier if the
    credibility of witnesses is a factor in the trial court’s decision.” (quoting Coury
    v. Prot, 
    85 F.3d 244
    , 254 (5th Cir. 1996))).
    All of the experts in this case agreed that Brumfield had never been
    diagnosed with an intellectual disability prior to the Atkins hearing, and the
    district court was rightly wary about a “made-for-litigation diagnos[i]s.”
    Brumfield 
    II, 854 F. Supp. 2d at 404
    . However, Swanson gave the court “a
    compelling reason to not draw a negative inference due to the lack of childhood
    diagnosis” by explaining the political incentives in place at the time Brumfield
    was in school. 
    Id. In doing
    so, Swanson told a “coherent and facially plausible”
    story. 
    Anderson, 470 U.S. at 575
    . Therefore, the district court’s refusal to give
    preclusive effect to the lack of a previous diagnosis of intellectual disability is
    not clearly erroneous. 
    Id. Overall, while
    the State points to evidence that undermines the district
    court’s conclusion that Brumfield is intellectually disabled, it has not pointed
    to sufficient evidence to establish that the district court’s finding of intellectual
    disability was not “plausible in light of the record viewed in its entirety.” 
    Id. at 574.
    Therefore, we hold that the district court committed no clear error.
    IV. CONCLUSION
    In this case, we are called upon to determine whether the district court’s
    conclusion that Brumfield is intellectually disabled is clearly erroneous, i.e.,
    whether we have a firm and definite conviction that the district court made a
    mistake here. Both the State and Brumfield present plausible views of the
    evidence, although, on balance, Brumfield’s witnesses were somewhat stronger
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    No. 12-30256
    and presented a slightly more compelling view. Given that there are two
    permissible views of the evidence here and the Supreme Court’s guidance that
    the choice by a trier of fact between two permissible views of the evidence
    cannot be clearly erroneous, we find no clear error in the district court’s
    conclusion that Brumfield is intellectually disabled.
    Because the State has not demonstrated clear error on the part of the
    district court, we AFFIRM the ruling of the district court that Brumfield is
    intellectually disabled and, accordingly, ineligible for execution.
    43