Heck Van Tran v. Roland Colson , 2014 FED App. 0203P ( 2014 )


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  •                            RECOMMENDED FOR FULL-TEXT PUBLICATION
    Pursuant to Sixth Circuit I.O.P. 32.1(b)
    File Name: 14a0203p.06
    UNITED STATES COURT OF APPEALS
    FOR THE SIXTH CIRCUIT
    _________________
    HECK VAN TRAN,                                          ┐
    Petitioner-Appellant,    │
    │
    │       No. 11-5867
    v.                                               │
    >
    │
    ROLAND COLSON, Warden,                                  │
    Respondent-Appellee.     │
    ┘
    Appeal from the United States District Court
    for the Western District of Tennessee at Memphis
    No. 2:00-cv-2451—Samuel H. Mays, Jr., District Judge.
    Argued: June 12, 2013
    Decided and Filed: August 25, 2014
    Before: ROGERS, COOK, and WHITE, Circuit Judges.
    _________________
    COUNSEL
    ARGUED: Robert L. Hutton, GLANKLER BROWN, PLLC, Memphis, Tennessee, for
    Appellant. James E. Gaylord, OFFICE OF THE TENNESSEE ATTORNEY GENERAL,
    Nashville, Tennessee, for Appellee. ON BRIEF: Robert L. Hutton, GLANKLER BROWN,
    PLLC, Memphis, Tennessee, Brock Mehler, Nashville, Tennessee, for Appellant. James E.
    Gaylord, OFFICE OF THE TENNESSEE ATTORNEY GENERAL, Nashville, Tennessee, for
    Appellee. Steven J. Mulroy, CECIL C. HUMPHREYS SCHOOL OF LAW, Memphis,
    Tennessee, for Amici Curiae.
    _________________
    OPINION
    _________________
    ROGERS, Circuit Judge. Heck Van Tran, a Tennessee prisoner under sentence of death,
    appeals the district court’s judgment denying his petition for a writ of habeas corpus pursuant to
    1
    No. 11-5867                    Van Tran v. Colson                                               Page 2
    28 U.S.C. § 2254. Van Tran raised twenty-six claims in his original habeas petition. The district
    court and this court have certified three claims for this appeal: (1) whether Van Tran is
    intellectually disabled and his execution would therefore violate the Eighth Amendment under
    Atkins v. Virginia, 
    536 U.S. 304
    (2002);1 (2) whether, as applied to Van Tran’s crime, the
    “heinous, atrocious, or cruel” aggravating circumstance of the capital jury instruction violates the
    Eighth and Fourteenth Amendments; and (3) whether Van Tran’s penalty phase counsel was
    ineffective, thereby violating the Sixth, Eighth, and Fourteenth Amendments. The district court
    committed no error in denying the writ of habeas corpus on the second and third claims. With
    respect to the first claim, however, because the Tennessee state court’s decision did not apply the
    proper legal standard for assessing whether Van Tran has intellectual disability, which was
    announced in a recent decision of the Tennessee Supreme Court, the district court’s judgment
    must be vacated and remanded. In accordance with the Supreme Court’s command that the
    procedural scheme for enforcing Atkins is within the state’s purview and because the State is
    faced with a state law–imposed procedural burden it could not have anticipated at the time of the
    original state-court Atkins hearing, we remand for the entry of a conditional writ of habeas
    corpus to allow the state courts to consider Van Tran’s Atkins claim under the proper, now-
    governing standard.
    I.
    Heck Van Tran was born in 1966 in Vietnam, during the Vietnam War, the son of a
    Vietnamese woman and an American serviceman. Van Tran’s father died two years after his
    birth. Van Tran and his mother lived in poverty, and as a young child Van Tran suffered severe
    social deprivation and inadequate support. He began speaking at a late age, although even after
    beginning to speak he had difficulty articulating words and spoke infrequently and in short
    1
    The lower courts in this case, as well as the parties until now, have used the term “mental retardation” to
    describe a neurological condition typified by significant limitations in both intellectual and adaptive functioning.
    More recent judicial opinions and the professional community have adopted the contemporary term “intellectual
    disability,” which describes the identical specific condition (despite the new term’s arguably different sense in
    common parlance). See Hall v. Florida, 
    134 S. Ct. 1986
    , 1990 (2014). This semantic practice has also been adopted
    by the State of Tennessee. Coleman v. State, 
    341 S.W.3d 221
    , 226 n.5 (Tenn. 2011); 2010 Tenn. Pub. Acts ch. 734
    (modifying Tenn. Code Ann. § 39-13-203). In light of the practice now accepted among courts, legislatures, and the
    professional community, we adopt for our present analysis the term “intellectual disability.” However, where
    quoting and discussing previous opinions and reports that employed the term “mental retardation,” we will employ
    the old term for clarity of reference.
    No. 11-5867                    Van Tran v. Colson                                               Page 3
    phrases. He and his mother were relocated to Memphis by a charitable organization in 1983. He
    attended one year of school in the United States, during which he had good attendance but got
    poor grades. He dropped out in 1984.
    In October 1987, Van Tran and three accomplices participated in an armed robbery of the
    Jade East Restaurant in Memphis, Tennessee, where Van Tran had been employed and from
    which he had been fired a month or two before. During the robbery, three people were killed. A
    fourth, a seventy-five-year-old woman, was beaten and knocked unconscious. The victims were
    all related and worked in the restaurant together. The robbers obtained a few jewelry cases from
    the restaurant’s back office, and two diamond rings, a necklace, and a watch that were taken
    from the survivor’s person. A detailed summary of the incident, including the ensuing interstate
    manhunt, is found in the Tennessee Supreme Court’s statement of the facts at State v. Van Tran,
    
    864 S.W.2d 465
    , 468–70 (Tenn. 1993). For the purposes of this appeal, it suffices to summarize
    a few additional facts.
    During the robbery, Van Tran twice shot Kai Yin Chuey, a slight, seventy-four-year-old
    woman. The first time he shot her through her windpipe, although he claims that this was an
    accident. A few moments later, he placed the gun directly against the back of her skull and shot
    her again, killing her instantly. During the robbery, two others were killed. Van Tran shot one
    of them in the face; his accomplices shot the other while Van Tran collected the loot.
    Six months later, Van Tran was arrested in Houston, where he confessed that he
    participated in the robbery. After trial, Van Tran was convicted of three counts of felony
    murder; he was sentenced to death for each count on the basis of two aggravating circumstances,
    one of which was that the murder was found to be “especially cruel in that it involved depravity
    of mind.” 
    Id. at 470.2
    On direct appeal, the Tennessee Supreme Court affirmed Van Tran’s
    convictions on the three counts of felony murder, but reversed his sentence of death for two of
    the three murders, affirming the death sentence only for the murder of Kai Yin Chuey. 
    Id. at 482.
    In arriving at this decision, the state supreme court disapproved of the deletion of the words
    2
    Under the Tennessee Code at the time, a defendant could be sentenced to death if the jury found that
    “[t]he murder was especially heinous, atrocious, or cruel in that it involved torture or depravity of mind.” Van 
    Tran, 864 S.W.2d at 478
    (quoting Tenn. Code Ann. § 39-2-203(i)(5) (1982)).
    No. 11-5867                Van Tran v. Colson                                        Page 4
    “heinous” and “atrocious” from the aggravating circumstance instruction. However, the court
    ultimately affirmed on the grounds that the curtailed instruction did not likely confuse the jurors,
    that the jury still made the dispositive “depravity of mind” finding, and relatedly, that the failure
    to include those terms in the instruction had no effect on the result. 
    Id. at 479.
    In addition, the Tennessee Supreme Court independently determined that there was
    sufficient evidence presented at trial to find that the killing of Kai Yin Chuey evinced “depravity
    of mind.” 
    Id. at 480.
    In making this determination, the court summarized the murder in the
    following manner:
    In [Kai Yin Chuey’s] case we have a helpless 74-year-old woman, who had
    already been shot by the Defendant and was lying on the floor unable to protect
    herself when the Defendant put a gun to the back of her head and shot her a
    second time. We find the evidence of this brutal and senseless execution of a
    helpless old woman sufficient to support this aggravating circumstance in the
    murder of Kai Yin Chuey.
    
    Id. Van Tran
    filed a state postconviction petition in March 1995, claiming, among other
    things, that he received ineffective assistance of counsel and that he should not be executed
    because he is mentally retarded and incompetent. After being denied relief in the postconviction
    trial court, Van Tran appealed to the Tennessee Court of Criminal Appeals (TCCA), where the
    trial court’s judgment was affirmed. Van Tran v. State, No. 02C01-9803-CR-00078, 
    1999 WL 177560
    , at *13 (Tenn. Ct. Crim. App. Apr. 1, 1999). Regarding Van Tran’s claim of ineffective
    assistance of counsel for failure to investigate and present additional mitigating evidence during
    the penalty phase, the appellate court found that trial counsel conducted a proper investigation
    and that there was no prejudice. 
    Id. at *11–12.
    As to whether Van Tran’s execution was
    prohibited by state statute because of his mental retardation, the appeals court deferred to the
    postconviction trial court’s finding that Van Tran’s I.Q. was above 70, which was based upon the
    State’s expert’s testimony that Van Tran’s expert had misread the manual related to I.Q.
    calculation and had arrived at an erroneously low figure. 
    Id. at *6.
    With respect to only the issue of whether Van Tran’s execution was prohibited because of
    mental retardation, Van Tran’s petition eventually reached the Tennessee Supreme Court, which
    No. 11-5867                    Van Tran v. Colson                                              Page 5
    took up the case “in order to clarify the procedure by which a prisoner who has been sentenced to
    death may raise the issue of present mental competency to be executed.” Van Tran v. State,
    
    6 S.W.3d 257
    , 260 (Tenn. 1999). The court denied Van Tran’s request for relief primarily on the
    ground that the issue of his competency for the purposes of execution was not ripe for resolution,
    because the execution was not imminent. 
    Id. at 274.
    Van Tran filed a motion to reopen his
    postconviction petition in February 2000, alleging that new evidence established that he was
    mentally retarded and was therefore ineligible for the death penalty under state law. When this
    petition reached the Tennessee Supreme Court, that court announced as an issue of first
    impression that execution of mentally retarded persons was prohibited by the Eighth Amendment
    of the U.S. Constitution and Article I, Section 16 of the Tennessee Constitution. Van Tran v.
    State, 
    66 S.W.3d 790
    , 809 (Tenn. 2001).                     The state supreme court remanded to the
    postconviction trial court for a hearing on the issue of whether Van Tran qualified as mentally
    retarded. 
    Id. at 812.
    Furthermore, the court held that mental retardation, for the purposes of the
    state and federal constitutions, was defined by the Tennessee Code. The code defined mental
    retardation, for the purposes of prohibiting the execution of those with mental retardation,
    according to the following three necessary criteria: “(1) significantly subaverage general
    intellectual functioning as evidenced by a functional intelligence quotient (I.Q.) of seventy
    (70) or below; (2) deficits in adaptive behavior; and (3) mental retardation manifested during the
    developmental period, or by eighteen (18) years of age.” 
    Id. (citing Tenn.
    Code Ann. § 39-13-
    203 (1997)). Within a year, the United States Supreme Court would similarly hold that the
    execution of persons with mental retardation violates the United States Constitution. Atkins v.
    Virginia, 
    536 U.S. 304
    , 321 (2002).3
    On remand, the postconviction trial court held a trial to determine whether Van Tran was
    mentally retarded as defined by § 39-13-203 of the Tennessee Code.                             At the trial, two
    psychologists testified that Van Tran is mentally retarded under the statute’s definition. Van
    Tran v. State, 
    2006 WL 3327828
    , at *2–13 (Tenn. Ct. Crim. App. Nov. 9, 2006). Both doctors
    based their conclusions on tests personally administered to Van Tran, his institutional records,
    3
    Because the United States Constitution provides the legal basis for habeas relief in this court and Atkins
    and Van Tran announce identical prohibitions on the execution of persons with intellectual disability, we will refer
    to the claim that a capital defendant cannot be executed because of intellectual disability as an Atkins claim.
    No. 11-5867                   Van Tran v. Colson                                               Page 6
    and interviews with him, his mother, and others who knew him. In addition to finding that Van
    Tran currently has an I.Q. of seventy or below and suffers from numerous deficits in adaptive
    behavior,4 both experts concluded that Van Tran’s deficits manifested themselves during the
    developmental period, before Van Tran was eighteen years old. Dr. Daniel Grant based this
    conclusion on a social history that discussed Van Tran’s late language skills, his difficulties in
    school, and his lack of success in living independently. 
    Id. at *5.
    Dr. Pamela Auble based her
    conclusion that Van Tran’s impairments appeared during the developmental period on numerous
    risk factors provided in the tenth edition of the American Association on Mental Retardation’s
    reference manual, including a traumatic brain injury during youth, malnutrition, poverty, lack of
    social resources, and prenatal maternal smoking. 
    Id. at *11;
    see also American Association on
    Mental Retardation, Mental Retardation: Definition, Classification, and Systems of Supports 127
    tbl. 8.1 (10th ed. 2002) (“AAMR 10th”).
    The State presented no testimony to contradict the findings of Van Tran’s experts,
    although it did test Van Tran’s experts with some cross-examination.
    The postconviction trial court denied Van Tran’s request for relief, finding that he had
    not demonstrated mental retardation under the Tennessee statute by a preponderance of the
    evidence. Van Tran, 
    2006 WL 3327828
    , at *15. Although the court found that Van Tran
    satisfied the first prong by proving that he has a functional I.Q. of seventy or below, the court
    determined that Van Tran had failed to meet his burden of proof for the second and third prongs.
    With respect to the second prong, the existence of deficits in adaptive behavior, the court found
    that Van Tran had demonstrated an adaptive deficit in only one area, that of communication.
    The court weighed the experts’ testimony against evidence that Van Tran had held a few jobs
    and had occasionally cooked for and cared for others. The court held that, in light of the
    4
    The trial court, following some of the experts’ testimony and the typical test used by Tennessee courts,
    adopted the following definition of “adaptive deficits” for the purposes of the second prong:
    The DSM-IV defines adaptive behavior using a set of ten criteria, as adopted from the Manual of
    the American Association of Mental Retardation 9th Edition. The ten criteria listed for
    consideration include: social interpersonal skills, communication, self-direction, work, leisure,
    home living, functional academics, self-care, health and safety, and use of community resources.
    In order to have significant deficits in adaptive behavior, a person must demonstrate deficits in at
    least two of these areas.
    See also Van 
    Tran, 66 S.W.3d at 795
    (endorsing ten-area framework).
    No. 11-5867                Van Tran v. Colson                                      Page 7
    evidence of Van Tran’s at least somewhat successful social and individual functioning, he had
    not demonstrated by a preponderance of the evidence that he suffered adaptive deficits in the
    areas of self-direction, social interpersonal skills, personal health and safety, or functional
    academics. 
    Id. at *16.
    Because the court found that Van Tran suffered from a deficit in only one
    area of adaptive functioning, it concluded that Van Tran did not meet the second prong.
    Regarding the third prong, the trial court found that Van Tran had not presented sufficient
    evidence demonstrating the manifestation of deficits before the age of eighteen. The court noted
    that no test of intellectual functioning was administered prior to Van Tran’s incarceration and
    that neither testifying expert “could offer any real proof to establish that the deficits occurred
    prior to the age of eighteen.” 
    Id. at *17.
    The court also noted that Van Tran’s current deficits,
    rather than being caused by neurological deficit, could have been caused by neglect or paranoid
    schizophrenia, which had not been diagnosed for many years. 
    Id. On appeal,
    the TCCA affirmed the trial court’s denial of Van Tran’s request for relief.
    
    Id. at *27.
    The appellate court agreed with the trial court that some of the adaptive functioning
    tests used by Van Tran’s experts were untrustworthy because they relied on interviews with
    people that either had not observed Van Tran frequently or had not observed him in a non-
    institutionalized setting. 
    Id. at *23.
    The appellate court emphasized Van Tran’s unique position,
    suggesting that Van Tran’s limited education, history of drug and alcohol use, schizophrenia, and
    lack of ordinary life experiences all negatively impacted the effectiveness of the living skills tests
    that were used by the experts:
    We agree with the trial court’s assessment that the Petitioner is in a unique
    position. The Petitioner was born in Vietnam. There is no question that the
    Petitioner’s childhood was atypical. His social history reveals abuse, neglect, and
    social ostracism. He essentially “lived on the streets” until age seventeen when he
    came to this country through the assistance of Catholic Charities. The Petitioner’s
    formal schooling was limited to several years in Vietnam and about one year in
    this country. The Petitioner has spent the majority of his time in this country
    incarcerated. While the Petitioner’s experts maintained that the Petitioner was
    more proficient in the English language than in Vietnamese, proof at the
    Petitioner’s original post-conviction hearing indicated that the Petitioner had
    difficulty communicating with trial counsel until a Vietnamese interpreter was
    appointed. A social worker with Catholic Charities testified that the Petitioner
    spoke and understood the Vietnamese language. The Petitioner has a history of
    drug and alcohol use. The Petitioner has also been diagnosed with paranoid
    No. 11-5867                Van Tran v. Colson                                     Page 8
    schizophrenia. The proof also corroborates the trial court’s conclusion that the
    Petitioner was in a position unique to most American adults. Dr. Grant conceded
    that the Petitioner had probably never “filled out a check, or a money order.”
    Moreover, there is no indication that the testing questions took into account the
    Petitioner’s lifestyle in Vietnam or that he has spent the majority of his adult life
    incarcerated. Accordingly, we agree with the trial court’s assessment that little
    weight should be given to the Petitioner’s below average score on the Independent
    Living Scale.
    
    Id. at *24.
    The court also found:
    The circumstances of the Petitioner’s crime belie any assertion that the Petitioner
    suffered from any deficit in intellectual ability or adaptive skills. The Petitioner
    had previously been employed by the victims of his crime. He knew the layout of
    the restaurant and knew that jewelry was kept on the premises. The Petitioner did
    the talking with one of the victims at the onset of the crime. The Petitioner was
    the person that went into the office to collect the jewelry. After the crime, the
    Petitioner escaped with two of his co-defendants to Houston, Texas, where it was
    the Petitioner who arranged to sell the jewelry to a Vietnamese man for $4,000. It
    was also the Petitioner who paid this man from the proceeds and divided the
    money with his two co-defendants.
    
    Id. at *25.
    Finally, the appellate court determined that Van Tran had not demonstrated that his
    intellectual deficits manifested themselves prior to his reaching the age of eighteen:
    The Petitioner had not been administered any test of intellectual functioning prior
    to reaching the age of eighteen, and no testing was performed until ten years after
    his incarceration. The only proof establishing this third prong [was] reliance upon
    social factors present in the Petitioner’s childhood, including extreme poverty and
    child abuse. In this regard, we cannot conclude that the trial court’s conclusion
    that the Petitioner’s late development could have been the result of “neglect”
    rather than neurological deficit was in error or contrary to the evidence. The
    evidence of poverty, child abuse, lack of education, family dysfunction and poor
    social conditions are not enough to demonstrate that any deficits manifested
    during the developmental period. The proof established that the Petitioner
    supported himself, took care of others, and was employed. The proof also
    established that the Petitioner, with the aid of an interpreter, was able to assist and
    communicate with his trial attorneys. The occurrences of these abilities all
    occurred after the age of eighteen. Moreover, we conclude that the fact that the
    Petitioner admits to alcohol and drug abuse and the fact that he has been
    diagnosed with schizophrenia may have impaired his brain functioning. Finally,
    Dr. Auble’s litany of potential “risk factors” fail to provide sufficient facts to
    support the conclusion that any impairments were revealed during the
    developmental period. Accordingly, Petitioner cannot satisfy the third prong of
    the test for mental retardation.
    No. 11-5867                Van Tran v. Colson                                    Page 9
    
    Id. at *26.
    Tran originally filed his federal habeas petition in May 2000. In May 2001, the district
    court entered an order holding the petition in abeyance while Van Tran exhausted his state-court
    remedies. Tran v. Bell, 
    145 F. Supp. 2d 939
    (W.D. Tenn. 2001). The district court took the case
    out of abeyance in April 2007, after which Tran filed an amended petition raising twenty-six
    claims in December 2007.
    On September 30, 2010, the district court denied Van Tran’s petition in its entirety.
    Order, Van Tran v. Bell, No. 00-2451-SMH, at 140 (W.D. Tenn. Sept. 30, 201) (“District Court
    Order”). Regarding Van Tran’s Atkins claim, the district court first held that the state court’s
    determination that Van Tran was not limited in functional academics was an unreasonable
    determination of the facts based on the evidence presented in the state court. 
    Id. at 64.
    This
    determination meant that Van Tran met his burden for the second prong, because the state court
    had already found that he had a deficit in one other area, that of communication. However, the
    district court went on to find that the state court was reasonable in its determinations that Van
    Tran did not suffer from deficits in the areas of self-direction and social/interpersonal skills, on
    the ground that the state court was able to base its conclusion on record evidence that
    contradicted the experts’ testimony about Van Tran’s gullibility, lack of personal responsibility,
    and mental rigidity. 
    Id. at 66–68.
    Despite finding that the state court was not reasonable in finding that Van Tran did not
    suffer from deficits in adaptive behavior, the district court found reasonable the state court’s
    ultimate finding that Van Tran had not sufficiently demonstrated mental retardation, based solely
    upon Van Tran’s failure to meet the third prong. In particular, the district court held that the
    state postconviction appellate court’s finding, namely that Van Tran did not sufficiently
    demonstrate that his intellectual deficits manifested themselves in the developmental stage, was
    neither contrary to nor an unreasonable application of federal law, and was not based on an
    unreasonable determination of the facts in light of the evidence presented. 
    Id. at 75.
    The district
    court reasoned that “[a]n expert’s testimony that an individual is ‘at risk’ of mental retardation
    because of congenital factors, poverty, and abuse is not enough to support an Atkins claim.” 
    Id. at 74
    (citing In re Mathis, 
    483 F.3d 395
    , 398–99 (5th Cir. 2007)). The court also reasoned that a
    No. 11-5867                  Van Tran v. Colson                                 Page 10
    lack of evidence does not entitle a petitioner to relief. 
    Id. The district
    court went on to support
    the state court’s finding:
    In the instant case, the Tennessee Court of Criminal Appeals’ determination was
    not based solely on the fact of Van Tran’s schizophrenia, but also on the lack of
    evidence available about Van Tran’s early development. The court noted Van
    Tran’s abilities in contrast to his stated deficits and the possible effects of drug
    abuse and mental illness on his cognitive abilities. Despite some possibility that
    Van Tran suffered significant adaptive deficits before age 18, the court’s
    determination that he failed to meet his burden is neither contrary to nor an
    unreasonable application of clearly established precedent, or based on an
    unreasonable determination of facts in light of the evidence presented. Van Tran
    has not satisfied the requirements to prove mental retardation and obtain habeas
    relief for his Atkins claims.
    
    Id. at 75.
    Next, the district court held that the state supreme court’s narrowing construction of the
    aggravating circumstance was constitutional, because it provided specific and detailed guidance
    rendering the capital process susceptible to rational review. 
    Id. at 96–97.
    The court also held
    that the state supreme court’s determination that there was sufficient evidence to find that the
    facts of Van Tran’s crime evinced “depravity of mind” was neither contrary to nor an
    unreasonable application of clearly established federal law and was based on a reasonable
    determination of the facts. 
    Id. at 98.
    Regarding the ineffective-assistance-of-counsel claim, the
    district court held that the state appellate court did not apply the Strickland test unreasonably and
    did not rely on an unreasonable determination of the facts; the court noted that the evidence that
    could have been presented at trial was not significantly different from what was actually
    presented. 
    Id. at 103–04.
    The district court granted Van Tran a certificate of appealability with respect to claim
    (2), that he has mental retardation, and claim (4), that the “depravity of mind” aggravating
    circumstance was unconstitutionally vague as applied. 
    Id. at 140–42.
    Van Tran moved this
    court to expand the scope of this appeal, and we subsequently certified claim (7), that Van Tran
    received ineffective assistance of trial counsel during the penalty phase because his counsel
    failed to properly investigate and present all available mitigating evidence.
    No. 11-5867                Van Tran v. Colson                                   Page 11
    II.
    A. Standard of Review and Governing Law
    The merits of Van Tran’s habeas claims are governed by the Antiterrorism and Effective
    Death Penalty Act (AEDPA), under which a writ of habeas corpus may not be granted unless the
    state court’s adjudication of the claim “(1) resulted in a decision that was contrary to, or involved
    an unreasonable application of, clearly established Federal law, as determined by the Supreme
    Court of the United States; or (2) resulted in a decision that was based on an unreasonable
    determination of the facts in light of the evidence presented in the State court proceeding.”
    28 U.S.C. § 2254(d); see also Berghuis v. Thompkins, 
    130 S. Ct. 2250
    , 2259 (2010).
    Under the “contrary to” clause, a federal habeas court may grant the writ if the state court
    arrives at a conclusion opposite to that reached by the Supreme Court on a question of law, or if
    the state court decides a case differently than the Supreme Court on a set of materially
    indistinguishable facts.   Brown v. Payton, 
    544 U.S. 133
    , 141 (2005); Williams v. Taylor,
    
    529 U.S. 362
    , 412–13 (2000). To obtain habeas relief, “a state prisoner must show that the state
    court’s ruling on the claim being presented in federal court was so lacking in justification that
    there was an error well understood and comprehended in existing law beyond any possibility for
    fairminded disagreement.” Harrington v. Richter, 
    131 S. Ct. 770
    , 786–87 (2011).
    State court determinations of fact are presumed to be correct, and the petitioner bears the
    burden of rebutting this presumption of correctness by clear and convincing evidence. 28 U.S.C.
    § 2254(e)(1). Our review under § 2254(d)(1) is limited to the record that was before the state
    court. Cullen v. Pinholster, 
    131 S. Ct. 1388
    , 1398 (2011).
    B. Atkins Claim
    The Eighth and Fourteenth Amendments prohibit the execution of intellectually disabled
    persons. Hall v. Florida, 
    134 S. Ct. 1986
    , 1990 (2014); Atkins v. Virginia, 
    536 U.S. 304
    , 321
    (2002). The Supreme Court left to the individual states “the task of developing appropriate ways
    to enforce the constitutional restriction.” 
    Atkins, 536 U.S. at 317
    . Accordingly, the Atkins Court
    “did not provide definitive procedural or substantive guides” for enforcing the Atkins protection.
    Bobby v. Bies, 
    556 U.S. 825
    , 831 (2009). The Court recently elucidated this vague command:
    No. 11-5867                 Van Tran v. Colson                                  Page 12
    [T]he States play a critical role in advancing protections and providing the
    [courts] with information that contributes to an understanding of how intellectual
    disability should be measured and assessed. But Atkins did not give the States
    unfettered discretion to define the full scope of the constitutional protection.
    
    Hall, 134 S. Ct. at 1998
    . Thus, the Tennessee legislature and courts have discretion, within
    reason, to determine the procedures by which the Tennessee courts will ensure that persons with
    intellectual disability are not executed in violation of the Eighth Amendment. The Tennessee
    legislature and courts also have discretion to define intellectual disability substantively for the
    purposes of Atkins, but this latter discretion is limited.
    Tennessee, in accordance with longstanding clinical practice, has adopted the standard
    definition of intellectual disability with the following three elements: “(1) Significantly
    subaverage general intellectual functioning as evidenced by a functional intelligence quotient
    (I.Q.) of seventy (70) or below; (2) Deficits in adaptive behavior; and (3) The intellectual
    disability must have been manifested during the developmental period, or by eighteen (18) years
    of age.” State v. Pruitt, 
    415 S.W.3d 180
    , 202 (Tenn. 2013) (quoting Tenn. Code Ann. § 39-13-
    203(a)); see also 
    Hall, 134 S. Ct. at 2003
    .
    The first prong of the definition of intellectual disability is not at issue, which the State
    concedes. The second prong was met under the reasoning of the district court, which we uphold
    on de novo review. Although the state court found that Van Tran had failed to meet the third
    prong, this was contrary to or an unreasonable application of federal law in light of intervening
    Tennessee law in Coleman v. State, 
    341 S.W.3d 221
    (Tenn. 2011), in which the Tennessee
    Supreme Court explicated the role of expert testimony in a court’s consideration of Atkins
    claims. Under Coleman’s guidance, Van Tran should be granted a conditional writ of habeas
    corpus in order to allow the state postconviction court to reconsider Van Tran’s Atkins claim
    under the now-governing legal standard.
    First Prong: Intelligence Quotient
    With regard to the first prong, the TCCA held that Van Tran had satisfied the first prong
    of the test because he had proved by a preponderance of the evidence that he had a functional
    No. 11-5867                Van Tran v. Colson                                  Page 13
    I.Q. of 70 or below. Van Tran, 
    2006 WL 3327828
    , at *20 (Tenn. Ct. Crim. App. Nov. 9, 2006).
    The parties do not contest this issue on appeal.
    Second Prong: Adaptive Deficits
    With regard to the second prong, although the issue is close, the district court correctly
    found that the state court unreasonably applied the facts in arriving at the conclusion that Van
    Tran demonstrated only one adaptive deficit. Overall, the TCCA reasoned in a holistic way that
    departed unreasonably from the reliable expert analyses used by Van Tran’s experts, which were
    in accordance with the professionally accepted definitions provided by the statute and the clinical
    best practices endorsed by the Tennessee Supreme Court. The reliable and professionally vetted
    methods presented by Van Tran’s experts, from which the legal standards draw their substance,
    must guide the court’s inquiry. The postconviction trial and appellate courts’ ad hoc, ostensibly
    commonsense reasoning, by itself, is not sufficient to reject the experts’ conclusions that Van
    Tran has more than one adaptive deficit.
    The Tennessee Supreme Court has stated generally that “deficits in adaptive behavior
    ‘mean[s] the inability of an individual to behave so as to adapt to the surrounding
    circumstances.’” 
    Coleman, 341 S.W.3d at 248
    (quoting State v. Smith, 
    893 S.W.2d 908
    , 918
    (Tenn. 1994)). In order to demonstrate deficits in adaptive behavior sufficient to satisfy the
    second prong of the intellectual disability test, Tennessee courts typically require the defendant
    to demonstrate “significant limitations” in two of the following skill areas: “communication,
    self-care, home living, social/interpersonal skills, use of community resources, self-direction,
    functional academic skills, work, leisure, health, and safety.” See Van Tran v. State, 
    66 S.W.3d 790
    , 795 (Tenn. 2001) (citing American Psychiatric Association, Diagnostic and Statistical
    Manual of Mental Disorders 39 (4th ed. 1994) (“DSM-IV”)). This approach, as clearly set out in
    the Van Tran opinion of 2001 and borrowed from the DSM-IV (and its revision, the DSM-IV-
    TR), was cited with approval by the state supreme court in the recent Coleman opinion.
    
    Coleman, 341 S.W.3d at 248
    –49; see also American Psychiatric Association, Diagnostic and
    Statistical Manual of Mental Disorders 49 (4th rev. ed. 2000) (maintaining two-out-of-ten-area
    framework). Similarly, in Howell v. State, the state supreme court intimated approval of the two-
    or-more-deficits approach by stating that “the most widely recognized definitions of mental
    No. 11-5867                    Van Tran v. Colson                                             Page 14
    retardation include two basic characteristics: significantly subaverage intellectual functioning
    accompanied by related limitations in two or more adaptive skill areas (such as self-care,
    communication, or social skills), and manifestation of the condition before age 18.” 
    151 S.W.3d 450
    , 457 (Tenn. 2004) (emphasis added). Most importantly, the state postconviction courts
    below appeared to use this framework in analyzing Van Tran’s adaptive deficits. For these
    reasons, although other frameworks could be used,5 it is most appropriate in this case to adhere
    to the two-out-of-ten framework on habeas review of the state court’s decision.
    As an initial matter, it is uncontested that Van Tran suffers from deficits in
    communication, one of the ten areas of adaptive behavior. In order to satisfy the second prong,
    therefore, Van Tran had to demonstrate by a preponderance of the evidence that he suffers from
    a deficit in at least one of the other areas. Because we conclude, like the district court below,
    that it was not reasonable for the Tennessee courts to find no adaptive deficit with respect to
    functional academics, we need not address the remaining eight factors.
    The district court correctly determined that the TCCA’s “determination that Van Tran
    was not limited in functional academics, especially considering the court’s finding that he had
    deficits in reading proficiency and language skills, was an unreasonable determination of fact
    based on the evidence presented.” District Court Order at 64. The State’s brief on this appeal
    devotes little more than a page to refuting this conclusion. Appellee’s Br. at 53–54. The
    evidence presented in the record demonstrates that Van Tran had significant deficits in the area
    of functional academics. The state trial court, in an analysis adopted by the TCCA, reasoned as
    follows in rejecting the functional academics adaptive deficit:
    5
    For example, the American Association on Mental Retardation changed the adaptive behavior analysis in
    the Tenth Edition of its manual. The Ninth Edition, released in 1992, employed the two-out-of-ten framework. See
    AAMR 10th at 25. However, the Tenth Edition, released in 2002, employed three broader categories that it deemed
    “are more consistent with the structure of existing measures and with the body of research evidence on adaptive
    behavior.” 
    Id. at 73.
    Now, the requirement of “significant limitations in adaptive behavior” has been “operationally
    defined as performance that is at least two standard deviations below the mean of either (a) one of the following
    three types of adaptive behavior: conceptual, social, and practical, or (b) an overall score on a standardized measure
    of conceptual, social, and practical skills.” 
    Id. at 13.
    Although this analysis was explained by Dr. Auble and both
    Drs. Grant and Auble applied tests that purport to assess adaptive behavior pursuant to the Tenth Edition, see Van
    Tran, 
    2006 WL 3327828
    , at *21–23, it is sufficient for our purposes to rely solely on the two-out-of-ten test that is
    used most frequently by the Tennessee courts and which appeared to be the primary guide in the analysis of the state
    court in this case.
    No. 11-5867               Van Tran v. Colson                                    Page 15
    Finally, the court further disagrees with the assessment that petitioner suffers
    deficits in the area of functional academics. The court does not disagree that the
    petitioner has deficits in the area of reading proficiency and language skills, but
    finds petitioner’s deficits are more in the area of communication than functional
    academics. Petitioner only attended school in the United States for one year, and
    attended school in Vietnam sporadically for a total of only two years. To the
    court’s knowledge, no records exist from the school(s) in Vietnam. Moreover, on
    the one test designed to determine petitioner’s functional academic level,
    petitioner’s score was not below average. Dr. Grant testified that he administered
    the Kaufman Functional Academic Skills Test and petitioner’s functional
    academic score was 79. In looking at the individual parts of the test, petitioner’s
    math score was much higher than his reading score. Other testing seemed to
    indicate the same pattern. Despite the fact that these tests may indicate some
    academic deficit in the area of reading, this court finds it is unable to say such
    results indicate an overall deficit in the area of functional academics. This is
    especially true in light of the court’s conclusion that petitioner does have deficits
    in communication and Dr. Grant’s testimony that all of the tests were given in
    English without the aid of an interpreter. While[] Dr. Grant maintains the
    petitioner’s English skills are better than his Vietnamese, this court finds this fact
    significant in evaluating the weight to be given to Dr. Grant’s conclusions. Given
    the fact that the petitioner’s functional academic score was 79; the fact that the
    petitioner may have had difficulty understanding the testing due to the language
    barrier; the fact that petitioner has a very limited formal education; and the fact
    that the only areas where petitioner showed deficiencies were in the areas
    involving language skills, this court finds the evidence does not establish deficits
    in the area of functional academics.
    This discounting of expert testimony was based on the trial court’s refusal to accept the
    expert conclusions of Van Tran’s witnesses, in light of the district court’s disagreement with the
    expert opinions as to what the tests indicated and how the test results were affected by the fact
    that English was Van Tran’s second language. These conclusions, while perhaps reasonable in
    appearance to a layperson, are in the context of this case too unsupported by the record to be
    upheld as reasonable. The State presented no testimony to contradict the conclusions of Van
    Tran’s experts, all of whom agreed that he suffered significant deficits in functional academics.
    Dr. Adler, a nationally certified school psychologist, testified that Van Tran was
    “functionally illiterate” and could not, for example, comprehend a newspaper article written at a
    sixth-grade level.   Dr. Grant, a board-certified forensic examiner and neuropsychologist,
    administered the Kaufman Academic Skills Test, on which Van Tran scored an arithmetic
    standard score of 93, a reading standard store of 66, and a functional academic score of 79. Dr.
    No. 11-5867                Van Tran v. Colson                                   Page 16
    Grant emphasized that the fact that Van Tran does not suffer a “significant deficit” in arithmetic
    did not change his conclusions, noting that “retarded individuals are just like the rest of us, they
    have strengths and they have weaknesses.” Dr. Grant testified that Van Tran was reading at a
    fourth-grade level, and that it was important to note that he continued to read at a fourth-grade
    level even after eight or nine years of instruction in a G.E.D. program. Similarly, Dr. Auble
    concluded, based on Van Tran’s plateauing at a fourth grade–level reading skill, that Van Tran
    demonstrates an adaptive deficit in functional academics, noting that “he really has not
    progressed much in terms of his functional academics despite many, many[] years of schooling.”
    The expert testimony explicitly refuted the concern that the tests were affected by the fact
    that the tests were conducted in English, Van Tran’s non-native language. Dr. Grant explained
    in his testimony why he decided to conduct his tests on Van Tran in the English language even
    though Van Tran’s native tongue is Vietnamese. Dr. Grant testified that Van Tran is seriously
    deficient in Vietnamese and that he performed no better than a child in effectively
    communicating in Vietnamese. Dr. Grant also noted that his colleague Dr. Wasserman, a
    bilingual psychologist, had determined that Van Tran’s proficiency in English exceeded his
    proficiency in Vietnamese and that he would score higher on tests in English than in Vietnamese.
    A bilingual correctional officer also confirmed that Van Tran’s proficiency in Vietnamese is
    “very low.” The State presented no evidence contradicting the expert evidence that Van Tran
    was more proficient in English than Vietnamese.
    Because the State presented no evidence to support the theory that Van Tran’s tests
    administered in English were unreliable because they were not given in his native language, the
    state court unreasonably discredited the testimony of the psychologists who administered Van
    Tran’s tests in English. Given that there are various considerations in the choice of which
    language to use, and that the diagnostic tests were administered and interpreted by a member of
    the professional group that designs and frequently applies the tests, the choice of the language in
    which to administer the test is reasonably within the clinical discretion of the professional
    administering the test. Without a contradictory analysis by another member of the profession, a
    court is in no position to question the professional judgment used in decisions associated with the
    administration of a clinical diagnostic test. This conclusion finds some support in an Atkins case
    No. 11-5867                Van Tran v. Colson                                   Page 17
    from the Fifth Circuit. In Rivera v. Quarterman, the Fifth Circuit considered the State of Texas’s
    argument that the intelligence tests administered to a bilingual capital defendant should have
    been adjusted upward to compensate for his bilingualism. 
    505 F.3d 349
    , 361 (5th Cir. 2007).
    The psychiatrist who had administered the test testified that she spoke with the defendant before
    administering the test and had no trouble communicating with him in English. 
    Id. In addition,
    other witnesses testified that they conversed with the defendant in English and without
    communication difficulties. 
    Id. However, the
    State presented the testimony of an expert who
    explained that the defendant’s bilingualism negatively impacted his verbal acuity and thereby
    artificially decreased the results of the I.Q. test administered by the defendant’s expert. 
    Id. The Fifth
    Circuit rejected the State’s argument that the district court erred by crediting the testimony
    of the psychiatrist who administered the test, largely because, as Texas’s own expert witness
    acknowledged on the stand, the ultimate decision of which language in which to administer the
    intelligence tests is a clinical judgment that must be made with the clinician’s professional
    judgment. 
    Id. at 362.
    In the present case, the State’s argument that the tests were unreliable is
    even less plausible, because the State relied neither on a general theory about bilingualism nor on
    any expert testimony presented.
    Notwithstanding the TCCA’s general failure to adhere to the clinical framework, the
    sophistication of the crime and Van Tran’s role in it are mostly irrelevant to the very narrow,
    clinically defined question of whether Van Tran suffers a deficit in the area of functional
    academics. In Hooks v. State, the Oklahoma Court of Criminal Appeals held that evidence that
    the defendant ran a prostitution ring was admissible at an Atkins hearing, because a crime that
    involved a continuing criminal enterprise “requires a level of abstract thought, coupled with the
    ability to carry out plans, which might be beyond the capabilities of a mentally retarded person.”
    
    126 P.3d 636
    , 644 (Okla. Ct. Crim. App. 2005). By contrast, the court noted that “individual
    acts of violent crime, such as armed robbery or rape, require little or no abstract thought or
    complex planning.” 
    Id. Van Tran
    ’s murder is of the latter kind; it was impulsive, committed in
    the heat of a tense moment during an armed robbery performed with accomplices. Fleeing the
    jurisdiction with his accomplice does not indicate forethought or planning, but rather an
    impulsive response to an armed robbery gone awry. Selling the stolen goods is a fairly basic
    response to the desperate situation in which Van Tran and his accomplice surely found
    No. 11-5867                Van Tran v. Colson                                    Page 18
    themselves. None of these actions is so sophisticated or elaborate that the intellectually disabled
    could not have performed it.
    Furthermore, the overemphasis on certain perceived strengths, inferred from anecdotal
    evidence, is inconsistent with the expert testimony and accepted professional analyses. Dr. Grant
    testified that “retarded individuals . . . have strengths and they have weaknesses.” Indeed, one of
    the “essential” assumptions of the clinical definition is: “Within an individual, limitations often
    coexist with strengths.” AAMR 10th at 1, 8. In Black v. Bell, we noted expert testimony that
    “someone might be mentally retarded but still be able to carry out any of a number of everyday
    activities, such as maintaining a simple job or driving a car.” 
    664 F.3d 81
    , 99 (6th Cir. 2011).
    Thus, we held that, in light of the expert testimony presented, “[a] full, independent review of
    whether [the petitioner] showed . . . that he displayed adaptive deficits . . . must therefore look at
    his weaknesses instead of at his strengths.” Id.; see also United States v. Davis, 
    611 F. Supp. 2d 472
    , 499, 501 (D. Md. 2009).
    The irrelevance of Van Tran’s criminal conduct to functional academics is consistent
    with the TCCA’s decision in Howell v. State, No. W2009-02426-CCA-R3-PD, 
    2011 WL 2420378
    (Tenn. Ct. Crim. App. June 14, 2011). In affirming the postconviction trial court’s
    finding that the defendant did not exhibit at least two deficits in adaptive behavior, the appellate
    court accepted that “the facts and circumstances of Petitioner’s convictions reflect that Petitioner
    adapted and adjusted to his surroundings throughout the course of his three state crime spree,” 
    id. at *19,
    and upheld the trial court’s use of anecdotal evidence to contradict the expert conclusions
    about “additional deficits in adaptive behavior,” 
    id. at *18.
    However, the appellate court did not
    use this assessment to contest the expert testimony presented to demonstrate deficits in academic
    functioning. See 
    id. Rather, the
    trial court had accepted the experts’ findings that there were
    deficits in “academic functioning” and used the anecdotal evidence to counter “claims of
    additional deficits,” for which “the testing was done retroactively and was contradicted by
    Petitioner’s conduct.” 
    Id. The most
    natural reading of the Howell decision supports the use of
    relevant anecdotal evidence to contradict specific findings regarding individual adaptive deficits,
    especially where there is a dearth of directed expert testimony regarding those deficits. Here,
    although Van Tran’s crime and ensuing actions could provide useful data points in assessing
    No. 11-5867                   Van Tran v. Colson                                Page 19
    adaptive behavior deficits, the persuasive expert testimony that Van Tran suffered a deficit in the
    area of functional academics was not contradicted by the facts of his conviction.
    The foregoing does not undermine the court’s ultimate decision-making role. As the
    Supreme Court said in Kansas v. Crane, 
    534 U.S. 407
    , 413 (2002), “the science of psychiatry,
    which informs but does not control ultimate legal determinations, is an ever-advancing science,
    whose distinctions do not seek precisely to mirror those of the law.” However, where lawmakers
    deliberately incorporate clinical standards into legal definitions, the courts strain the limits of
    reasonableness by rejecting expert opinions based exclusively on the courts’ own inexpert
    analysis. Although “the trial court is not required to follow the opinion of any particular expert,”
    it “must give full and fair consideration to all the evidence presented.” Coleman, 341 S.W.3d at
    at 242. The Tennessee Supreme Court has emphasized the importance of clinical judgment in
    guiding the courts to overall more accurate and consistent decisions. See 
    id. at 246–47.
    Because the postconviction courts performed an analysis in terms of these ten areas of
    adaptive deficits, which it borrowed from the methods used by the expert witnesses, our review
    utilizes the same framework. Adherence to some chosen clinical framework, even if such
    adherence is not rigid, appears to be required by Tennessee law. In a comprehensive review of
    the state supreme court’s previous decisions interpreting § 39-13-203, the Coleman court stated
    that one of the principles guiding the application of the statute is that “[t]he Court’s application
    of the statute may be guided and informed by the clinical standards, criteria, and practices
    customarily used to assess and diagnose intellectual disability.” 
    Coleman, 341 S.W.3d at 240
    (citing State v. Strode, 
    232 S.W.3d 1
    , 14 (Tenn. 2007)). Although the use of the term “may”
    appears permissive, the state supreme court in the same opinion communicated a strong policy in
    favor of employing clinical definitions, supplied necessarily by experts in the field of intellectual
    disability, when it stated that “[a]ligning the application of the statute with the clinical approach
    to diagnosing and assessing intellectual disability will result in more accurate and consistent
    decisions.” See 
    id. at 247.
    Indeed, the state supreme court has consistently indicated that the clinical definitions,
    although not binding, have a close semantic relationship to the statutory definition. For example,
    the Van Tran opinion of 2001 stated that the Tennessee courts refer to the DSM-IV framework
    No. 11-5867                Van Tran v. Colson                                   Page 20
    for assessing adaptive deficits “for the purpose of providing insight and background into mental
    retardation,” although not strictly “for the purpose of expanding upon or interpreting the
    statutory definition in 
    Tennessee.” 66 S.W.3d at 795
    n.4. Citing this statement with approval,
    the Coleman court stated: “Tennessee courts have thus relied on this [clinical] definition to better
    understand what the Tennessee Code means by addressing deficits in adaptive 
    behavior.” 341 S.W.3d at 248
    n.86. The ten-area framework from the DSM-IV was cited with approval yet
    again in the Tennessee Supreme Court’s most recent decision expounding § 39-13-203, which
    called the DSM-IV’s ten-area framework “[t]he accepted clinical definition of adaptive
    functioning.” State v. Pruitt, 
    415 S.W.3d 180
    , 204 (Tenn. 2013). The most reasonable reading
    of these various propositions is that the courts should be guided, though not constricted, by the
    two-out-of-ten-area clinical definition from the DSM-IV.
    More importantly, the court must assess adaptive deficits in light of the expert testimony
    presented by the parties. The trial court “must give full and fair consideration to all of the
    evidence presented,” especially the testimony of experts who “bring to bear and utilize reliable
    practices, methods, standards, and data that are relevant in their particular fields.” 
    Coleman, 341 S.W.3d at 242
    . Although not mandating any particular analysis for adaptive deficits, the
    state supreme court in Coleman found that the trial court committed reversible error by
    distinguishing causally between intellectual disability and mental illness where that distinction
    was not supported by expert evidence, and hence there “was error in light of the evidence
    presented by” the defendant’s expert witnesses. 
    Id. at 251–52.
    Because “[t]he State presented
    no contrary evidence,” there was “simply no sufficient basis on the present record to” make the
    conceptual distinction the court made. 
    Id. at 252
    (emphasis added).
    The Tennessee Supreme Court’s recent decision in State v. Pruitt, 
    415 S.W.3d 180
    (Tenn.
    2013), reinforces the proposition that “full and fair consideration” of expert testimony requires
    the trial court to treat as dispositive expert testimony establishing and utilizing methods of
    analysis that is uncontradicted by other expert testimony. In that case, two of the defendant’s
    experts testified that his I.Q. was below seventy. 
    Id. at 202–03.
    One of the experts testified that
    a raw score of of sixty-six might have been slightly below the defendant’s true level of cognitive
    functioning because the defendant did not appear to take the test seriously; and the other expert
    No. 11-5867                Van Tran v. Colson                                    Page 21
    noted that the defendant, answering hastily, might not have thought through all of the questions.
    
    Id. at 203.
    And “[a]lthough both experts stated that Mr. Pruitt may not have given his best effort
    on the tests, neither testified that Mr. Pruitt’s I.Q. would have been higher than seventy if his
    effort had been greater,” and “[n]either expert testified that Mr. Pruitt’s test scores were
    ‘unreliable.’” 
    Id. The trial
    court nonetheless “found that neither [test score] was the product of
    Mr. Pruitt’s best efforts and that his grades in school and [state achievement test] scores
    indicated that the . . . test scores were unreliable.” 
    Id. at 200.
    The Tennessee Supreme Court
    reversed this finding, distinguishing between the experts’ speculative asides about the test
    administration and the considerations that actually contributed to the experts’ final conclusions:
    . . . Although the scores in this case were called into question by the trial
    court, neither expert opined that Mr. Pruitt’s I.Q. was greater than seventy,
    whether through lack of effort or on some other basis for adjustment of the raw
    score. Neither expert testified that the tests had an element of unreliability in their
    administration.
    Under these circumstances, we are unwilling to uphold a finding that the
    tests are of no value in determining whether Mr. Pruitt has met his burden in
    showing that his I.Q. is seventy or below . . . . The evidence showed that Mr.
    Pruitt had I.Q. test scores below seventy. In the absence of expert testimony that
    his I.Q. was above seventy, we hold that the evidence preponderates against the
    trial court’s determination that Mr. Pruitt failed to prove that he had significantly
    subaverage general intellectual functioning as evidenced by a functional I.Q. of
    seventy or below.
    
    Id. at 203.
    This analysis further supports Coleman’s implication that a trial court in Tennessee
    cannot disregard reliable expert opinions on the issue of intellectual disability when those
    opinions are based on clinically sound and professionally accepted methods and there is no other
    expert testimony that supports an analysis leading to a contrary conclusion.
    It follows from the above discussion that Tennessee law does not permit the state trial
    court to use its independent judgment to disregard uncontroverted expert analyses, consider
    factors that the experts have testified are unreliable, or declare to be dispositive a factor
    irrelevant to the clinical definitions employed by the experts. At one point, the Tennessee
    Supreme Court declined to define in a careful and delineated form the term “adaptive deficits,”
    stating that the term should be construed in a commonsense way as “the inability of an individual
    to behave so as to adapt to surrounding circumstances.” State v. Smith, 
    893 S.W.2d 908
    , 918
    No. 11-5867                Van Tran v. Colson                                     Page 22
    (Tenn. 1994). But more recently, the court has turned toward reliance on expert analysis. With
    respect to intellectual functioning, the Coleman court stated that, for example, “[a]scertaining a
    person’s I.Q. is not a matter within the common knowledge of lay persons,” and concluded that
    “[e]xpert testimony in some form will generally be required to assist the trial court in
    determining whether a criminal defendant is a person with intellectual disability.” 
    Coleman, 341 S.W.3d at 241
    (emphasis added). Adaptive deficits are similarly outside the ken of the lay
    judge.    The Coleman court, as it did with I.Q., emphasized reliance on expert analysis:
    “Notwithstanding State v. Smith, Tennessee’s trial and appellate courts have repeatedly relied
    upon expert analysis of adaptive behavior or functioning predicated upon definitions advanced
    within the relevant medical and psychological community and authoritative texts such as the
    AAIDD Manual and the DSM-IV in determining whether the second prong has been satisfied.”
    
    Id. at 248.
    This construction of Tennessee law under Coleman is buttressed by the United States
    Supreme Court’s recent opinion in Hall v. Florida, 
    134 S. Ct. 1986
    (2014), which clarified the
    minimum Atkins standard under the U.S. Constitution (whereas Coleman interpreted state
    constitutional and statutory law). In Hall, the Court reasoned that the Constitution requires the
    courts and legislatures to follow clinical practices in defining intellectual disability. In that case,
    the Court confronted directly the question of “how intellectual disability must be defined in order
    to implement the[] principles and the holding of Atkins.” 
    Id. at 1993.
    The Court emphasized that
    “[s]ociety relies upon medical and professional expertise to define and explain how to diagnose
    the mental condition at issue,” for a variety of important legal determinations not limited to the
    death penalty. 
    Id. The Court
    held that Florida’s strict I.Q. cutoff of 70 was unconstitutional, in
    part because it “disregard[ed] established medical practice.” See 
    id. at 1995.
    This decision
    supports the position of the Tennessee Supreme Court that “the courts would make these fact-
    intensive and complex decisions with the assistance of experts in the field.”               
    Coleman, 341 S.W.3d at 244
    .
    In light of the methods and analyses employed by the expert witnesses, the TCCA
    unreasonably determined that Van Tran was not intellectually disabled. The TCCA emphasized
    too heavily in its analysis the facts of the crime, which are not relevant to the analysis of most of
    No. 11-5867                Van Tran v. Colson                                  Page 23
    the areas of adaptive behavior, especially that of functional academics.         The TCCA also
    incorporated by reference the analysis of the state postconviction trial court, which undertook a
    careful analysis within the ten-area framework. That analysis, as incorporated by the TCCA,
    was reasonable except with respect to the area of functional academics.
    The district court thus properly determined, notwithstanding AEDPA deference, that Van
    Tran suffers from deficits in two of the ten areas of adaptive behavior, thereby satisfying the
    second prong of the statutory definition of intellectual disability.
    Third Prong: Early Onset
    Because under the now-prevailing standards for adjudicating claims of intellectual
    disability the TCCA used an erroneous causation analysis with respect to the third prong of early
    onset, Van Tran is entitled to habeas relief conditioned on a new evidentiary hearing before the
    state trial court. In particular, the postconviction hearing given to Van Tran did not meet the
    retroactively applicable substantive and procedural standards set forth by the Tennessee Supreme
    Court in Coleman v. State, 
    341 S.W.3d 221
    (Tenn. 2011).
    The state postconviction court ruled that there was no onset of intellectual disability
    during the developmental period despite strong evidence of pre-age-eighteen intellectual and
    adaptive deficits. Two board-certified experts in psychology, both trained and experienced in
    intellectual disability, testified about Van Tran’s early developmental challenges, which
    stemmed from his early childhood and continued through his arrival in the United States shortly
    before he turned eighteen. Van Tran, 
    2006 WL 3327828
    , at *2–12. Dr. Grant discussed how
    Van Tran was late in important developmental milestones: he was not toilet-trained until five
    years of age, did not speak until the age of six, and reportedly never advanced with his
    Vietnamese language skills beyond those of a five-year-old child. See 
    id. at *4–5.
    Dr. Grant
    testified that Van Tran’s most recent testing was consistent with prior achievement tests, and that
    his neurological impairment and intellectual deficiencies would have been stable over the course
    of his adult life, even despite the presence of schizophrenia in late adolescence. See 
    id. at *6.
    Dr. Auble’s testimony presented a compelling enumeration of circumstances in Van Tran’s
    childhood that made it likely that Van Tran would have developed his neurological impairments
    before the age of eighteen:
    No. 11-5867               Van Tran v. Colson                                   Page 24
    Dr. Auble stated that the evidence indicates that the impairments appeared during
    the Petitioner's developmental period. In this regard, she stated that the
    Petitioner’s life history indicates a number of risk factors that would have
    contributed to his mental retardation. Using a table listing various potential risk
    factors for mental retardation provided in the Tenth Edition of the AAMR, Dr.
    Auble proceeded to enumerate those factors applicable to the Petitioner. First, the
    Petitioner's mother had poor prenatal care. The Petitioner’s mother suffered from
    a fall while she was pregnant resulting in “some bleeding and some other injuries
    . . . .” The Petitioner’s mother “smoked about a half a pack a day at the time she
    was pregnant with him.” The Petitioner’s mother is “probably relatively limited
    in intelligence.” The Petitioner did not have medical treatment while he lived in
    Vietnam. As a child, he had malnutrition and reportedly had seizures. The
    Petitioner had traumatic brain injuries. The Petitioner also lacked adequate
    stimulation and experienced family poverty. His living situation was essentially
    homeless. During his childhood, he only attended school for two years. The
    Petitioner suffered child abuse and neglect. The Petitioner had no consistent
    caretakers or friends. His mother was a single parent, and the Petitioner did not
    really know his father. The Petitioner did not speak until he was six years old,
    and, when he did speak, his speech was abnormal. Presently, the Petitioner has
    speech impairments in both Vietnamese and English. The Petitioner was a poor
    student, although he did have good attendance. “These findings indicate that
    there was brain dysfunction that was present in childhood as well as present now.”
    Dr. Auble summarized, “. . . he had an impaired mother. He had lack of support
    from his family. He had abuse, poverty, war, discrimination . . . , early drug and
    alcohol abuse. All of this contributed to his compromised functioning during
    childhood.”
    
    Id. at *11.
    Both Drs. Grant and Auble noted that Van Tran’s early onset is corroborated by the
    academic difficulty he experienced during the year he spent in the Memphis school system,
    where he scored poorly on achievement tests and was slow to learn English in relation to
    similarly situated peers. 
    Id. at *4–6,
    12. The State offered no expert testimony to rebut Van
    Tran’s experts’ testimony establishing that Van Tran suffered from significant intellectual and
    adaptive deficits from as early as his childhood in Vietnam.
    The state trial court nonetheless found that Van Tran had not met his burden with respect
    to this third prong. The court relied substantially on the absence of any test of intellectual
    functioning before the age of eighteen. With respect to Van Tran’s late speech development, the
    court declined to attribute it to early-onset intellectual disability because “there could be a
    multitude of reasons why, as a child, petitioner did not speak or only spoke in a limited fashion.”
    The court similarly found that late toilet training could have been the result of a lack of
    No. 11-5867               Van Tran v. Colson                                    Page 25
    instruction rather than neurological deficit, and that his sporadic school attendance and life on
    the streets could have caused his poor school performance. The court also found that “it is just
    as likely that any deficits in intellectual functioning occurred as a result of [paranoid
    schizophrenia], and thus, did not develop until after the age of eighteen.” The trial court
    summed up:
    In this case there are no school records, no medical records, very little
    documented social history and the observations of the experts on this point are
    speculative at best. Additionally, there is evidence that tends to establish a
    legitimate alternative explanation for the petitioner’s below average I.Q. scores.
    Admittedly, Dr. Kenner could not say for sure how the petitioner would be
    [a]ffected. However, neither Dr. Grant nor Dr. Auble could say definitively that
    the disease had not [a]ffected petitioner’s neurological functioning.
    Having determined that, in light of the proof presented, it is not possible to
    discern when the petitioner’s deficits in intellectual functioning developed, this
    court finds petitioner has also failed to meet his burden with respect to the third
    prong of the statute.
    The TCCA affirmed. The TCCA relied on the absence of pre-age-eighteen testing and
    the possibility that Van Tran’s deficits were caused by substance abuse or schizophrenia instead
    of impaired brain functioning. Moreover, the court held that “[t]he evidence of poverty, child
    abuse, lack of education, family dysfunction and poor social conditions are not enough to
    demonstrate that any deficits manifested during the developmental period.” Van Tran, 
    2006 WL 3327828
    , at *26. The TCCA thus upheld the postconviction court’s rejection of the expert
    evidence of Drs. Auble and Grant.
    This conclusion is unreasonable, but only in light of the Tennessee Supreme Court’s
    intervening opinion in Coleman.
    It was unreasonable for the TCCA to conclude in this case “that the fact that the
    Petitioner admits to alcohol and drug abuse and the fact that he has been diagnosed with
    schizophrenia may have impaired his brain functioning.” Van Tran, 
    2006 WL 3327828
    , at *26.
    Under Coleman, it is not appropriate to separate neurological deficit from mental disorder as
    causes when determining whether a defendant actually suffers from cognitive and adaptive
    deficits, when the petitioner presents expert testimony to the contrary and the State does not
    rebut with its own experts. 
    Coleman, 341 S.W.3d at 252
    ; see also State v. Pruitt, 415 S.W.3d
    No. 11-5867                 Van Tran v. Colson                                     Page 26
    180, 203 (Tenn. 2013) (holding that lower court’s finding I.Q. tests were unreliable was
    erroneous, in light of the fact that no expert testified that they were unreliable).
    Furthermore, because the TCCA did not thoroughly address its reasoning about the
    impact of schizophrenia on Van Tran’s deficits, the court appears to have adopted the
    postconviction    trial   court’s    erroneous    determination     that    Van    Tran’s    cognitive
    functioning deteriorated as a result of suffering from untreated schizophrenia for seven years.
    This conclusion appeared to rely on the determination that Van Tran’s first treatment began
    when he was diagnosed by a Dr. Kenner in 1997, who also indicated at that time that Van Tran
    might have begun suffering from schizophrenia as early as 1989. However, the record clearly
    indicates that a Dr. Humble diagnosed Van Tran with schizophrenia in 1990, and that Van Tran
    began to be treated with medication in that same month. Thus, the TCCA could not have relied
    on the state trial court’s findings that Van Tran suffered from a long length of untreated
    schizophrenia and that his functioning may have deteriorated during that period of no treatment.
    Indeed, because Van Tran’s treatment began so early, the conclusion that Van Tran’s
    schizophrenia somehow tends to disprove early onset is undermined by Dr. Auble’s testimony
    that when schizophrenia is treated, “I.Q. scores do not decline and can, in fact, improve.” Van
    Tran, 
    2006 WL 3327828
    , at *10. Indeed, these corrections to the state trial court’s analysis
    imply the opposite of the state trial court’s conclusions.            That is, because Van Tran’s
    standardized test scores may have improved with treatment, the fact that he continues to suffer
    from deficits even now after a period of improvement implies that he also suffered the deficits in
    the past, before the improvement. Thus, the TCCA’s causal analysis with respect to Van Tran’s
    schizophrenia is unreasonable factually as well as legally.
    Similarly, regardless of whether Coleman would strictly forbid a causal analysis that
    separates out permanent impairments caused by drug and alcohol abuse, such an analysis is not
    reasonably supported by expert testimony in the record. There is no expert testimony regarding
    how a history of drug or alcohol abuse may have contributed to post-developmental impairment.
    In light of the facts and the expert testimony, the TCCA’s conclusion that alcohol and drug abuse
    may have permanently caused or substantially contributed to Van Tran’s cognitive and adaptive
    deficits in the three years between his eighteenth birthday and when he was incarcerated—the
    No. 11-5867                Van Tran v. Colson                                     Page 27
    only time that any testimony establishes he had access to drugs and alcohol in his adult life—
    appears unlikely. Van Tran had begun abusing drugs and alcohol at a young age, so much of his
    drug and alcohol abuse probably occurred prior to his eighteenth birthday. Indeed, Dr. Auble
    suggested that early drug and alcohol abuse may have actually contributed to the manifestation
    of deficits before the age of eighteen. Thus, the TCCA’s causal analysis was also flawed with
    respect to Van Tran’s history with drug and alcohol abuse.
    Further, the state court committed an error under Coleman by not giving “full and fair
    consideration” to the expert testimony regarding “risk factors.” 
    See 341 S.W.3d at 242
    . The
    TCCA misconstrued the experts’ testimony by interpreting the presence of “risk factors” as a
    concession that Van Tran could not demonstrate that he actually was mentally retarded. See
    
    2006 WL 3327828
    , at *26. The state court’s analysis conflated the issue of whether there are
    adaptive deficits with the related but distinct issue of distinguishing their causes:
    The only proof establishing this third prong were reliance upon social factors
    present in the Petitioner’s childhood, including extreme poverty and child abuse.
    In this regard, we cannot conclude that the trial court’s conclusion that the
    Petitioner’s late development could have been the result of “neglect” rather than
    neurological deficit was in error or contrary to the evidence. The evidence of
    poverty, child abuse, lack of education, family dysfunction and poor social
    conditions are not enough to demonstrate that any deficits manifested during the
    developmental period.
    
    Id. There are
    two critical errors with this characterization of Van Tran’s case for early onset.
    First, the state court mischaracterizes the nature of Van Tran’s proof; contrary to what the
    TCCA stated, the presence of risk factors were not the “only proof” of intellectual disability
    during the developmental period.        There was substantial real evidence of deficits being
    manifested before Van Tran reached the age of 18: his poor achievement tests in school in the
    United States, administered at the age of 17, which Dr. Adler opined “likely reflect an
    overestimate of his actual abilities”; the testimony of Van Tran’s mother that he was late in
    arriving at important developmental milestones, for instance, Van Tran did not speak until he
    was six; and the testimony of Dr. Grant that Van Tran’s early intellectual deficits could be
    inferred from his present subaverage I.Q. level because “I.Q. is usually, fairly consistent over
    No. 11-5867                Van Tran v. Colson                                   Page 28
    time.” These forms of evidence, which arise directly or indirectly from Van Tran’s actual pre-
    age-eighteen behavior, constitute real proof of early onset rather than mere observations about
    his environment.     See In re Mathis, 
    483 F.3d 395
    , 399 (5th Cir. 2007).          The state court
    incorrectly interpreted the experts’ “risk factor” analysis as a foundation of proof, rather than as
    an additional method of explaining, corroborating, and reinforcing their conclusion that Van
    Tran started suffering deficits in intellectual functioning and adaptive behavior at a young age.
    Second, the state court committed a Coleman error by using the “risk factors” presented
    by Van Tran’s experts to dismiss intellectual disability as the cause of any deficits that were
    manifested during Van Tran’s childhood. That is, the state court appears to have interpreted the
    presence of risk factors as proof that the cause of any deficits was “neglect” rather than
    “neurological deficit.” See Van Tran, 
    2006 WL 3327828
    , at *26. This is an error under
    Coleman, in which the Tennessee Supreme Court held that a court commits legal error when it
    makes causal distinctions in the absence of expert testimony supporting the court’s causal
    analysis. 
    See 341 S.W.3d at 252
    . In Coleman, the state supreme court relied exclusively on the
    expert testimony on record to support the court’s causal analysis. The experts in Coleman
    “concluded that, along with organic brain disorder and environmental factors, mental illness
    provided an aggravating factor joining together to limit Mr. Coleman’s adaptive functioning.”
    
    Id. Similarly, Van
    Tran’s experts testified that environmental factors as well as neurological
    deficits contributed to Van Tran’s adaptive and intellectual deficits. Just as in Coleman, the
    State presented no expert testimony to contradict Van Tran’s experts’ causal analysis, and
    therefore “[t]here is simply no sufficient basis on the present record to separate the impact of
    mental illness and intellectual disability in assessing [the defendant’s] deficits in adaptive
    behavior.” 
    Id. (emphasis added).
    The Coleman court found that, because it could not “conclude
    beyond a reasonable doubt that the lower courts’ erroneous causation analysis did not have a
    substantial and injurious impact on their determination that Mr. Coleman failed to carry his
    burden of establishing deficits in adaptive behavior,” the error was not harmless. 
    Id. For the
    same reasons, the TCCA’s erroneous reliance on a causal analysis unsupported by expert
    testimony on the record had a substantial and injurious impact on its final determination that Van
    Tran is not intellectually disabled.
    No. 11-5867                Van Tran v. Colson                                   Page 29
    The district court below correctly pointed out that “[a]n expert’s testimony that an
    individual is ‘at risk’ of mental retardation because of congenital factors, poverty, and abuse is
    not enough to support an Atkins claim.” District Court Order at 74 (citing In re 
    Mathis, 483 F.3d at 398
    –99). But Van Tran presented more than just expert testimony that he was “at risk” of
    intellectual disability at a young age. Van Tran’s experts testified that Van Tran actually was
    intellectually disabled under the statutory definition, which necessarily includes a finding that his
    intellectual and adaptive deficits were manifested in the developmental period. Dr. Grant stated
    in his report, “It is my professional opinion that Heck Van Tran is functioning within the
    mentally retarded range as defined by Tenn. Stat. Ann. § 39-13-203 in that he has subaverage
    intellectual functioning as evidenced by an I.Q. of 70 or below; he has deficits in adaptive
    behavior . . . and both were manifested before the age of eighteen.” Dr. Auble concluded in her
    report, “It is my professional opinion that Mr. Tran met the criteria for mental retardation at the
    time of the offense. There is evidence that Mr. Tran’s functioning has been impaired since
    childhood, and that it continues to be impaired at present.”
    Coleman is applicable in this case notwithstanding the State’s argument that it does not
    apply.    We are bound by our published decision in Black v. Bell to consider Coleman
    retroactively in our review of an Atkins claim under AEDPA. 
    664 F.3d 81
    , 92 (6th Cir. 2011).
    The defendant in Black claimed that his sentence of death was unconstitutional under Atkins, and
    he challenged in federal habeas proceedings the decision of the TCCA denying postconviction
    relief. After oral argument in the Sixth Circuit, the Tennessee Supreme Court released its
    decision in Coleman, which the panel characterized as “a significant decision explaining the
    Atkins standard under Tennessee law.” 
    Id. at 91.
    Because “[t]he rules governing what factors
    may be considered in determining whether a defendant qualifies as mentally retarded under
    Atkins deal with questions of law,” the court concluded that “[t]he TCCA’s assessment of
    Black’s level of intellectual and adaptive functioning was . . . contrary to Coleman under
    AEDPA’s legal standard.” 
    Id. at 100.
    We held that, because the state court’s analysis regarding
    intellectual disability contradicted the governing law, de novo review of the issue was required.
    
    Id. at 97
    (citing Fulcher v. Motley, 
    444 F.3d 791
    , 799 (6th Cir. 2006), and West v. Bell, 
    550 F.3d 542
    , 553 (6th Cir. 2008)). But the court “refrain[ed] from reaching any independent conclusions
    . . . because no court ha[d] yet analyzed Black’s Atkins claims according to the proper legal
    No. 11-5867               Van Tran v. Colson                                  Page 30
    standard, which was set out by the Tennessee Supreme Court in Coleman.” 
    Id. at 101.
    We
    vacated and remanded to the district court “to review the record based on the standard set out in
    Coleman.” Id.; see also Black v. Colson, No. 3:00-0764, 
    2013 WL 230664
    (M.D. Tenn. Jan. 22,
    2013) (conducting the independent analysis on remand).
    Contrary to the State’s argument, the Tennessee Supreme Court’s holding in Keen v.
    State that “Coleman’s holding . . . was not a constitutional ruling,” 
    398 S.W.3d 594
    , 609 (Tenn.
    2012), does not affect Black’s holding. First, the court in Keen was presented with a different
    issue in a different procedural context. The court in that case was determining whether the
    decision in Coleman could be grounds for reopening a case under Tenn. Code Ann. § 40-30-
    117(a)(1), which permits a motion to reopen on the basis of “a final ruling of an appellate court
    establishing a constitutional right.” See 
    Keen, 398 S.W.3d at 608
    . In contrast, here we are
    presented with determining what is “clearly established federal law” for the purposes of a
    petition for relief under § 2254. Coleman can still change the governing applicable law even if it
    does not assert a new constitutional right under Tennessee law. Second, the holding in Black
    does not rely upon the constitutional status of Coleman. Rather, the court in Black characterized
    Coleman merely as “a significant decision explaining the Atkins standard under Tennessee 
    law,” 664 F.3d at 91
    (emphasis added), and one that “elucidates Tennessee’s interpretation of Atkins’s
    legal standard,” 
    id. at 92
    (first emphasis added). Indeed, the Tennessee Supreme Court in Keen
    characterized Coleman’s relationship to Van Tran and Atkins’s constitutional right in a similar
    way, stating that Coleman “concerned the interpretation of Tenn. Code Ann. § 39-13-203” and
    that it “supplemented” and “clarified” previous case law. 
    See 398 S.W.3d at 608
    . In this way,
    Keen actually supports Black’s reading of Coleman’s effect on Tennessee law.
    Furthermore, the Tennessee Supreme Court itself has applied Coleman retroactively to
    review proceedings that occurred before Coleman. In State v. Pruitt, the court relied on Coleman
    to reverse a finding that the defendant did not have an I.Q. of seventy or below, even though the
    trial court’s decision came out “nearly two years before [the court] clarified in Coleman the
    process and criteria a trial court should use” to adjudicate an Atkins 
    claim. 415 S.W.3d at 203
    .
    Thus, Black’s retroactive application of Coleman is also consistent with Tennessee law, which
    No. 11-5867                Van Tran v. Colson                                  Page 31
    provides the procedural law that governs Van Tran’s Atkins claim. See Bobby v. Bies, 
    556 U.S. 825
    , 831 (2009).
    Black’s holding that this court may grant relief based upon Coleman applies to this case,
    because this case is in relevant ways procedurally identical to Black. Both cases involve Atkins
    claims in Tennessee. In both cases, the TCCA denied postconviction relief and the federal
    district court denied habeas relief based on the TCCA’s decision before Coleman was decided.
    In both cases, Coleman was decided before the district court was able to fully consider the case.
    Thus, as in Black, we have a situation in which Coleman intervened in between the decision of
    the district court and consideration by this court, changing the governing law regarding the
    standards by which Atkins claims in Tennessee are decided.
    As indicated above, in Coleman, the defendant appealed the denial of postconviction
    relief in the state 
    courts. 341 S.W.3d at 224
    . He had presented testimony by two expert
    witnesses to establish an Atkins claim under Tennessee’s statutory definition of intellectual
    disability, while the State presented no contrary evidence. 
    Id. at 227.
    The state supreme court
    declined to decide the proper approach to determine whether a defendant has demonstrated
    deficits in adaptive behavior, see 
    id. at 251–52
    & n.93, but rather held more narrowly that
    “distinguishing causally between intellectual disability and mental illness in the present case was
    error in light of the evidence presented” by the two experts, 
    id. at 252.
    Although “the trial court
    is not required to follow the opinion of any particular expert,” it “must give full and fair
    consideration to all the evidence presented.” 
    Id. at 242.
    Furthermore, in formulating their
    opinions, “experts may bring to bear and utilize reliable practices, methods, standards, and data
    that are relevant in their particular fields.” 
    Id. The court
    remanded so that the State could
    challenge the admissibility of the petitioner’s experts’ testimony and present additional expert
    testimony to counter the petitioner’s. 
    Id. at 253.
    In light of Coleman’s enunciation of the proper legal standard by which to evaluate
    Atkins claims, the TCCA’s decision did not apply the proper legal standard and was therefore
    contrary to clearly established governing law for the reasons given above. It is sufficient to draw
    relevant comparisons between this case and Coleman to demonstrate how the TCCA erred here.
    Like Coleman, the State presented no expert testimony to contradict the analysis of Van Tran’s
    No. 11-5867                 Van Tran v. Colson                                     Page 32
    experts. Like Coleman, the TCCA relied upon the presence of various factors that may have
    contributed to Van Tran’s deficits in intellectual functioning and adaptive behavior in order to
    cast doubt on experts’ opinion that intellectual disability caused these deficits. In both cases,
    “[b]ased upon the evidence presented” by the expert testimony, these factors are “simply too
    intertwined in cause and effect for such unraveling.” See 
    Coleman, 341 S.W.3d at 252
    . It is
    inappropriate in light of the expert testimony to treat “mental illness and intellectual disabilities
    as separate dichotomous spheres rather than as interwoven causes.” See 
    id. at 249.
    Similar to the TCCA’s decision that was under review in Black v. Bell, here “the record is
    rife with conflicting testimony” regarding onset, and “[t]he TCCA’s decision is of little help
    because the court made so few definitive factual determinations leading up to its ultimate
    conclusion” that Van Tran did not show onset by a preponderance of the 
    evidence. 664 F.3d at 100
    . Because it is at least clear that the TCCA’s decision was not entirely consistent with
    Coleman, the TCCA’s assessment of Van Tran’s intellectual and adaptive functioning prior to
    the age of 18 was contrary to Coleman.
    The Nature of the Remand
    This case presents a unique circumstance in that the constitutional protection depends on
    the content of state law that has changed retroactively since the relevant state court ruled, and the
    relevant state court ruled unreasonably in light of the change. Deference to the state court’s
    ability to apply its own law first, even where such application is compelled by the U.S.
    Constitution, suggests that the proper course at this stage is for the district court to grant a writ of
    habeas corpus prohibiting imposition of the death penalty, conditioned upon the fresh
    determination by the Tennessee courts whether Van Tran is intellectually disabled under the
    clarified principles set out in Coleman.
    Such relief is consistent with our “broad discretion in conditioning a judgment granting
    habeas corpus relief, [to] dispose of habeas corpus cases ‘as law and justice require.’” Pickens v.
    Howes, 
    549 F.3d 377
    , 382 (6th Cir. 2008) (quoting Hilton v. Braunskill, 
    481 U.S. 770
    , 775
    (1987)). Here, the defendant’s Atkins claim was not adjudicated under the governing legal
    standard, under which the enforcement of the substantive constitutional prohibition is
    inextricably intertwined with certain evidentiary and procedural considerations governed by state
    No. 11-5867                Van Tran v. Colson                                     Page 33
    law. When a constitutional error may be cured by further state proceedings, the common course
    is to grant the writ of habeas corpus conditional upon the state court’s correcting the error. See
    Gentry v. Deuth, 
    456 F.3d 687
    , 692 (6th Cir. 2006).
    This relief is consistent with the relief provided in Coleman itself. The Coleman court
    remanded to the state postconviction trial court for a new hearing under the standards enunciated
    in the case, and that hearing included the more robust, adversarial consideration of expert
    testimony in the final determination. 
    See 341 S.W.3d at 253
    . The Coleman court permitted the
    State to correct its failure to present expert testimony to challenge the clinical analyses of the
    defendant’s experts.     The court stated that “[o]n remand, the State may challenge the
    admissibility of [the defendant’s experts’] testimony, present expert testimony countering [those
    experts’] methods or conclusions on this issue, or do both.” 
    Coleman, 341 S.W.3d at 253
    . The
    Coleman court appeared to believe that it was important for the State to have an opportunity to
    correct a procedural mistake that the court was only then enunciating. Similarly, the State in Van
    Tran’s hearing before the state postconviction court occurred before Coleman came out, and the
    State did not act with the benefit of knowing the procedural implications of Coleman’s rules,
    which are now retroactively applicable to that proceeding. In fashioning relief for Van Tran in
    this case, we, like the Coleman court, should also take into consideration the State’s interest in
    being able to correct a flaw in its case against Van Tran that it might not have been able to
    foresee.
    Moreover, the procedural principles of Atkins suggest that the state postconviction trial
    court would be the most appropriate venue for de novo consideration under the new governing
    rules. Where a predominantly procedural mistake is made in a previous proceeding and the
    constitutionally required process must start anew, it is proper to let the court that would normally
    get the first crack at the issue take it up again. In Bobby v. Bies, the state court’s consideration of
    the defendant’s intellectual disability in a previous proceeding did not comply with Atkins. See
    
    556 U.S. 825
    , 831–32 (2009). The Supreme Court reversed the federal district court’s grant of
    habeas relief pursuant to Atkins, reasoning that it was inappropriate to disrupt the state court’s
    Atkins proceedings. See 
    id. at 837.
    The Court stated that “[r]ecourse first to [state] courts is just
    what this Court envisioned in remitting to the States responsibility for implementing the Atkins
    No. 11-5867                Van Tran v. Colson                                  Page 34
    decision.” 
    Id. Like the
    state court in Bobby v. Bies, Tennessee is poised to offer the necessary
    relief of a new Atkins hearing.
    We recognize that in Black we remanded to the district court with instructions to “review
    the record based on the standard set out in Coleman and consistent with [the Black] 
    opinion.” 664 F.3d at 101
    . In Black, however, the State had presented contrary expert evidence that could
    be evaluated by the federal court. 
    Id. at 89.
    In contrast, in this case as in Coleman itself, the
    State—unaware of the as-yet-undecided Coleman case—essentially presented no expert
    testimony. Because of this difference, the remedy provided in Black v. Bell, a remand to the
    district court for de novo consideration of the Atkins issue, would likely not achieve the optimal
    balance between Van Tran’s and the State’s separate interests in relitigating under the new
    Coleman principles.
    That is, it is necessary, as it was in Coleman, to fashion a remedy that allows the State to
    make the showing that Coleman now requires. A remand to the district court to consider the
    Atkins claim under the Coleman standard might not allow the State to present evidence, if it were
    determined that Van Tran was not independently entitled to a hearing. As a general matter, the
    district court could hold some form of evidentiary hearing to allow Van Tran to present
    additional evidence to support his claim. See, e.g., Jackson v. Norris, 
    615 F.3d 959
    , 962–64 (8th
    Cir. 2010).   And AEDPA did not change the “basic rule” that “the decision to grant an
    evidentiary hearing [is] generally left to the sound discretion of district courts.” Schriro v.
    Landrigan, 
    550 U.S. 465
    , 473 (2007) (citing Townsend v. Sain, 
    372 U.S. 293
    , 313 (1963)).
    When a court performs an independent review of a claim, like this, it may conduct an evidentiary
    hearing pursuant to the AEDPA’s hearing section, 28 U.S.C. § 2254(e), in order to permit the
    petitioner to present additional evidence. See Cullen v. Pinholster, 
    131 S. Ct. 1388
    , 1412 (2011)
    (Breyer, J., concurring); see also Burgess v. Comm’r, Ala. Dep’t of Corr., 
    723 F.3d 1308
    , 1321–
    22 (11th Cir. 2013) (reversing denial of request for evidentiary hearing on Atkins claim); Allen v.
    Buss, 
    558 F.3d 657
    , 665 (7th Cir. 2009) (same). However, § 2254(e)(2) and prior case law
    discussing the court’s basic discretion to hear new evidence do not appear to contemplate the
    peculiar situation in which the State would request an evidentiary hearing to develop in federal
    court its case that had not been fully developed in the state court. Tennessee, especially in light
    No. 11-5867                Van Tran v. Colson                                   Page 35
    of the court’s remand order in Coleman, is unquestionably capable of providing procedural relief
    for both Van Tran and the State. Thus, a balanced retroactive application of Coleman logically
    requires a conditional writ in the context of this case.
    C. Challenge to the “Heinous, Atrocious, or Cruel” Aggravating Circumstance
    Van Tran argues that the “depravity of mind” aggravating circumstance in Tenn. Code
    Ann. § 39-2-203(i)(5) (1982) (now codified in § 39-13-204(i)(5) (2011)), as applied in this case,
    is unconstitutionally vague. He maintains that the state court’s decision unreasonably applied
    Proffitt v. Florida, 
    428 U.S. 242
    (1976), and was contrary to Bell v. Cone, 
    543 U.S. 447
    (2005).
    In a footnote, Van Tran argues that the evidence was insufficient to support the jury’s verdict
    that Kai Yin Chuey’s murder showed depravity of mind beyond a reasonable doubt. Because
    there was sufficient evidence for a reasonable factfinder to find that Van Tran evidenced
    depravity of mind under the state supreme court’s constitutionally permissible narrowing
    construction, the district court’s denial of Van Tran’s petition on this ground must be upheld.
    The penalty phase jury sentenced Van Tran to death based on the trial court’s
    aggravating-factor instruction that the murder must be found to have been “especially cruel in
    that it involved depravity of mind.” State v. Van Tran, 
    864 S.W.2d 465
    , 470 (Tenn. 1993).
    Under the Tennessee Code at the time, a defendant could be sentenced to death if the jury found
    that “[t]he murder was especially heinous, atrocious, or cruel in that it involved torture or
    depravity of mind.” 
    Id. at 478
    (quoting Tenn. Code Ann. § 39-2-203(i)(5) (1982)). On direct
    appeal, the Tennessee Supreme Court disapproved of the deletion of the words “heinous” and
    “atrocious” from the instruction but ultimately affirmed on the grounds that the curtailed
    instruction did not likely confuse the jurors, that the jury still made the dispositive “depravity of
    mind” finding, and that the omission had no effect on the result. 
    Id. at 479.
    We must uphold the Tennessee Supreme Court’s finding that Van Tran committed
    murder in an especially cruel way that evinced depravity of mind because the court did not
    unreasonably apply the constitutionally permissible narrowing construction of the statute
    established by previous decisions of the court. Even if the instruction given by the sentencing
    court is deemed to be unconstitutionally vague, we will still uphold the sentence where the state
    appellate court properly applied a narrowing construction of a possibly vague statutory
    No. 11-5867                 Van Tran v. Colson                                 Page 36
    enhancement. Walton v. Arizona, 
    497 U.S. 639
    , 653–54 (1990), overruled on other grounds by
    Ring v. Arizona, 
    536 U.S. 584
    (2002). The United States Supreme Court has previously affirmed
    a sentence of death under the arguably vague statutory aggravating circumstance that was
    applied in this case, because the Tennessee Supreme Court “has recognized that its narrowing
    construction is constitutionally compelled and has affirmatively assumed the responsibility to
    ensure that the aggravating circumstance is applied constitutionally in each case.” Bell v. Cone,
    
    543 U.S. 447
    , 456 (2005).
    Here, the state supreme court was guided by the constitutionally permissible narrowing
    construction of the statute enunciated in State v. Williams, 
    690 S.W.2d 517
    (Tenn. 1985).
    “Torture” or “depravity of mind” must also be found in addition to cruelty, heinousness, or
    atrociousness, and “depravity of mind” can be found even where there is no gratuitous infliction
    of severe pain, physical or mental, that amounts to torture. 
    Id. at 529.
    “Moral depravity” is
    equivalent to a state of mind of “moral corruption,” which could be shown by a willingness to
    torture, but could also be shown by other morally corrupt acts, such as mutilation of a dead body.
    See 
    id. at 529–30.
    Although the trial court omitted heinousness or atrociousness as aggravating
    factors, the court gave the Williams definitions of “cruelty” and “depravity of mind” and stated
    that a finding of both was sufficient to impose the death sentence on Van Tran; the Tennessee
    Supreme Court relied upon this truncated instruction in affirming Van Tran’s sentence of death.
    Van Tran, 
    864 S.W.2d 465
    , 479. We have previously held that the narrowing construction of
    Williams, including the implication that depravity of mind or torture can be found without
    torture, is constitutionally permissible. Payne v. Bell, 
    418 F.3d 644
    , 660 (6th Cir. 2005). In
    particular, we noted that the Williams construction incorporated and expounded on previous
    decisions of the state supreme court, including constructions already declared constitutional by
    the United States Supreme Court. See 
    id. Here, the
    state supreme court reasonably applied the constitutionally permissible
    narrowed construction of the aggravating circumstance as interpreted and applied in the state
    court’s previous decisions. See Bell v. 
    Cone, 543 U.S. at 457
    . The facts of this case fit within
    the narrowed definition as applied in these previous cases. The state supreme court in Van
    Tran’s case followed State v. Black, in which it had previously held that the “brutal and senseless
    No. 11-5867               Van Tran v. Colson                                  Page 37
    execution style murder of a helpless child, who could not protect herself, evinces torture or
    depravity of mind.” 
    815 S.W.2d 166
    , 181–82 (Tenn. 1991). Analogously, Van Tran’s victim
    was helpless, since Kai Yin Chuey was a slight seventy-four-year-old woman whom Van Tran
    had already shot through the throat and who was lying defenseless on the floor. And like Black,
    when Van Tran placed his gun to her head and fatally shot her, he was committing an execution-
    style murder, in which the murderer kills the victim by shooting them at close range after
    rendering them helpless. The Eleventh Circuit in Hargrave v. Wainwright, in a similar situation,
    explained:
    An execution-style murder, as defined by the Florida courts, is typically one in
    which the defendant, without provocation, first renders his victim helpless—for
    example, by wounding the victim, tying the victim’s hands, or ordering the victim
    to the floor—and then shoots the victim in the head at close range, often to
    eliminate the victim as a future witness.
    
    804 F.2d 1182
    , 1195 (11th Cir. 1986). In State v. Dicks, 
    615 S.W.2d 126
    , 127, 132 (Tenn.
    1981), the Tennessee Supreme Court held that a murder was especially heinous, atrocious, or
    cruel where the defendant slashed the victim’s throat while the victim lay unconscious due to a
    blow to the head. The U.S. Supreme Court has approved the narrowing construction of the
    aggravating circumstance that the Tennessee Supreme Court used in Dicks, stating that an
    aggravator “directed at the conscienceless or pitiless crime which is unnecessarily torturous to
    the victim” meaningfully narrows the discretion of the court and thereby avoids a constitutional
    vagueness problem. Bell v. 
    Cone, 543 U.S. at 457
    –58 (quoting 
    Dicks, 615 S.W.2d at 132
    )
    (internal quotation marks omitted).
    Under these precedents and with a view of the evidence in the light most favorable to the
    State, it was reasonable for the state court to conclude that a rational trier of fact could have
    found beyond a reasonable doubt that Van Tran acted with depravity of mind. In the statement
    Van Tran made to the police, he indicated that he shot Kai Yin Chuey once accidentally and once
    intentionally. Van 
    Tran, 864 S.W.2d at 468-69
    . The Tennessee Supreme Court described her as
    a helpless seventy-four-year-old woman who had already been shot by Van Tran and was lying
    on the floor unable to protect herself when Tran shot her in the back of her head. 
    Id. at 480.
    She
    was four feet, nine inches tall, and weighed only ninety pounds. The shot to the back of her head
    was a contact wound, where the muzzle of the weapon was placed against the skin’s surface. 
    Id. No. 11-5867
                   Van Tran v. Colson                                   Page 38
    at 470. Kai Yin Chuey was not a threat to Van Tran, and by the time he shot her the second time
    Arthur Lee was no longer a threat because Van Tran had killed him. Because the Tennessee
    Supreme Court’s decision that a rational trier of fact could have found Tran showed depravity of
    mind was not objectively unreasonable, we cannot grant Van Tran habeas relief on the basis that
    the application of the aggravating circumstance was unconstitutional.
    D. Ineffective Assistance of Counsel Claim
    Van Tran argues that penalty phase counsel failed to investigate and present mitigating
    evidence, failed to introduce evidence to rebut the “depravity of mind” aggravating
    circumstance, failed to object to prosecutorial misconduct in closing argument, and failed to
    preserve and present issues on appeal. This court certified Tran’s claim that counsel failed to
    investigate and present mitigating evidence, but not his other ineffective-assistance-of-counsel
    claims. This court cannot consider claims not certified for appeal, so those claims will not be
    addressed. See 28 U.S.C. § 2253(c); Abdur’Rahman v. Colson, 
    649 F.3d 468
    , 473 (6th Cir.
    2011).
    Because the state court did not unreasonably apply the Strickland standard that governs
    ineffective-assistance-of-counsel claims, Van Tran is not entitled to relief on this ground. Under
    the deferential review standards of AEDPA, the already deferential Strickland standard becomes
    doubly deferential: “[t]he question is whether there is any reasonable argument that counsel
    satisfied Strickland’s deferential standard.” Harrington v. Richter, 
    131 S. Ct. 770
    , 788 (2011).
    In order to gain relief, Van Tran must satisfy both Strickland prongs: he must prove both that his
    counsel was objectively deficient and that he was prejudiced by his counsel’s deficient
    performance. Strickland v. Washington, 
    466 U.S. 668
    , 687 (1984). The postconviction review
    court found that Van Tran had neither proven that trial counsel conducted an improper
    investigation or had unreasonably failed to present mitigating evidence, nor established
    prejudice. Van Tran, 
    1999 WL 177560
    , at *12 (Tenn. Ct. Crim. App. Apr. 1, 1999). Van Tran
    is not entitled to relief if we find that the postconviction review court was not unreasonable in its
    determination regarding just one of the prongs.
    Because the state postconviction court’s determination that Van Tran suffered no
    prejudice was a reasonable application of the prejudice prong of the Strickland test, and the court
    No. 11-5867                Van Tran v. Colson                                   Page 39
    relied on a reasonable determination of the facts, Van Tran must be denied habeas relief
    according to § 2254(d).       Numerous relevant mitigating circumstances about Van Tran’s
    continuous social and education deprivations throughout life were presented at the initial trial;
    the additional mitigating evidence that Van Tran argues would have been presented had his
    counsel pursued further investigation is similar to and cumulative to the evidence that was
    actually presented. The balance of mitigating and aggravating circumstances was close and the
    presentation of additional and more precise mitigating circumstances about Van Tran’s
    upbringing and emotional and mental states may have made a difference in the jury’s ultimate
    determination. However, we cannot say that the state postconviction court was unreasonable in
    determining that because “[m]uch of this evidence is similar to that which was presented to the
    jury,” Van Tran had failed to “establish[] a reasonable probability that the jury’s determination
    would have been different.” Van Tran, 
    1999 WL 177560
    , at *12.
    The state court found that trial counsel had presented various forms of evidence in
    mitigation that were considered in adjudicating Van Tran’s culpability, including his
    “cooperation with the FBI, good employment history, lack of prior criminal involvement,
    remorse for the homicides, personal history as a child of a Vietnamese mother and an American
    father, difficult childhood and educational problems.” Van Tran, 
    1999 WL 177560
    , at *12
    (citing Van 
    Tran, 864 S.W.2d at 482
    ). These mitigating circumstances were presented during the
    testimony of several witnesses, including Van Tran’s mother, supervisors from Van Tran’s jobs,
    and Dr. Khanna, a clinical psychologist who testified that Van Tran was below average
    intelligence, depressed, and under a great deal of stress. 
    Id. at *8,
    11. For instance, Dr. Khanna
    testified to horrid abuses during Van Tran’s childhood, including a time spent in an orphanage, a
    time spent with his aunt in the countryside where she tied him to a tree naked and he was bit by
    ants, a period in which he lived alone on the streets as a young child, and early exposure to illicit
    substances. Dr. Khanna also testified that Van Tran had been abusing an inordinate amount of
    drugs and alcohol in the three days preceding the robbery, such that “he had lost all judgment—
    all reason—and he didn’t know probably where he was.” Van Tran’s trial counsel thus appears
    to have presented a fairly thorough, if not comprehensive, social and personal history of Van
    Tran that highlighted many mitigating factors.
    No. 11-5867                Van Tran v. Colson                                   Page 40
    The mitigating evidence that Van Tran argues his counsel failed to present is remarkably
    similar to the kind of evidence that was presented at trial. None of the evidence differs much in
    substance from what was presented; it differs mostly in form. Van Tran argues that his trial
    counsel should have provided the testimony of more experts: a licensed social worker fluent in
    Vietnamese and English to testify about the sociocultural history of Vietnam and the plight of the
    Amerasian population; a board-certified psychologist to testify about Van Tran’s post-traumatic
    stress disorder and the effects of his Amerasian status on his psychological well-being; an
    internist with a specialty in addiction to testify at greater length about Van Tran’s chemical
    dependency issues arising out of hypervigilance related to his difficult upbringing, and how this
    would have affected his perception and judgment during the murder; and, finally, a board-
    certified forensic and child psychiatrist to attest to Tran’s hypersensitivity and threat perception
    and explain their origins in his traumatic upbringing. Appellant’s Br. at 69–77. Van Tran argues
    that this information “changes the ‘entire evidentiary picture’” by “answer[ing] the questions . . .
    left unanswered about the significance of Tran’s early history, his status as an Amerasian, why
    he abused drugs, and whether shooting Kai Yin Chuey was a cold-blooded act.” Appellant’s Br.
    at 77–78. But the TCCA could reasonably conclude that the picture is not that different.
    The most significant difference between what evidence was presented at trial and what
    was presented in the postconviction proceeding is that the latter is presented in more scientific
    terms. See, e.g., Appellant’s Br. at 78 (describing the evidence that trial counsel failed to present
    as a “scientifically-grounded portrait of Tran”). Although the form of the proposed additional
    mitigation evidence differs in its manner of presentation, the differences are, from the jury’s
    perspective of final decisionmaker, somewhat superficial.         That is, the substance of these
    different analyses—whether based on Van Tran’s neurophysiology, the outcast social status of
    Amerasians, or the chemical and physiological details of his substance abuse—is substantially
    the same: Van Tran has suffered immense deprivation and misfortune during his life, which have
    all had a great impact on his ability to reason and make decisions. Precisely this argument was
    presented to the jury by the trial testimony of Dr. Khanna.
    Methodological diversity and precision are not necessarily sufficient to demonstrate that
    the jury would have arrived at a different conclusion, particularly where the jury’s final
    No. 11-5867                Van Tran v. Colson                                   Page 41
    determination is one that is unconstrained by technical scientific jargon. Here, the jury was
    asked to find simply whether Van Tran’s crime was especially cruel, in that it involved depravity
    of mind. Boiled down to this purest essence of common-sense judgment, this determination
    requires no specialty in psychology, psychiatry, neurophysiology, psychopharmacology, or
    sociocultural anthropology.
    The superfluity of presenting the same substance in a different form is supported by our
    precedent. In Clark v. Mitchell, this court held that a state court was reasonable in determining
    that a petitioner had failed to demonstrate prejudice by his counsel’s failure to present mitigation
    evidence in a suppression hearing in which the issue was whether the defendant had waived his
    rights voluntarily and knowingly. 
    425 F.3d 270
    , 281–82 (6th Cir. 2005). At the suppression
    hearing, a psychiatrist had testified in favor of the defendant, concluding that the defendant’s
    mental function would be considered “borderline defective” and that he suffered from acute
    brain damage that would have interfered with his decision making abilities. 
    Id. at 274–75.
    On
    appeal, the defendant argued that his counsel should have presented testimony from a
    neuropsychologist or pharmacologist to present evidence about organic brain syndrome and
    defendant’s drug addiction and related withdrawal symptoms, which arguably would have more
    comprehensively explained his actions. 
    Id. at 276.
    This court held that
    [t]he state court was also reasonable in determining that Clark had failed to
    demonstrate prejudice as a result of his counsel’s failure to introduce evidence
    from a neuropsychologist or pharmacologist at his suppression hearing or at trial.
    Clark’s defense team introduced evidence at Clark’s suppression hearing from a
    psychiatrist who concluded that Clark was suffering from depression, suicidal
    tendencies, and brain impairments that would have made Clark less able to
    understand his choices and to resist pressure from other individuals. It thus was
    reasonable for the state court to conclude that new information sought to be
    introduced by Clark about his drug addiction and brain disorder did not differ in
    a substantial way from the evidence actually presented at the suppression hearing
    and, accordingly, that Clark could not demonstrate that he was prejudiced by his
    counsel’s failure to present such evidence.
    
    Id. at 282–83
    (emphasis added).
    Although in the present case Van Tran presents a much more substantial argument about
    the presentation of his case in mitigation, his argument still suffers from the same problem that
    the Clark petitioner’s did, namely that the evidence does not differ in a substantial way from the
    No. 11-5867                 Van Tran v. Colson                               Page 42
    evidence actually presented at trial. Van Tran’s counsel presented substantial testimony about
    Van Tran’s horrific childhood and his dependence on drugs and the impact these influences had
    on his psychological state at the time of the crime. The court of criminal appeals followed this
    analysis in arriving at its conclusion:
    The suggested mitigating evidence related to petitioner’s cultural and social
    background and his medical condition. Much of this evidence is similar to that
    which was presented to the jury. Furthermore, considering the nature and
    circumstances of the offense, and the applicability of the two aggravating
    circumstances of mass murder and depravity of mind, we conclude petitioner has
    not established a reasonable probability that the jury’s determination would have
    been different had this evidence been presented.
    Van Tran, 
    1999 WL 177560
    , at *12. “[F]airminded jurists could disagree” on whether this is the
    correct result under federal law, and therefore we must uphold the state court’s decision under
    AEDPA as not an unreasonable application of established federal law. See Harrington v.
    Richter, 
    131 S. Ct. 770
    , 786 (2011).
    Accordingly, Van Tran is not entitled to relief for his claim of ineffective assistance of
    counsel.
    III.
    Van Tran is not entitled to relief on his ineffective-assistance-of-counsel or
    unconstitutional vagueness claims. The state court’s application of Tennessee law with regard to
    whether Van Tran is intellectually disabled under Atkins was contrary to clearly established
    federal law. Accordingly, we VACATE and REMAND to the district court so that the district
    court may grant a CONDITIONAL WRIT OF HABEAS CORPUS prohibiting execution unless
    the State completes a new Atkins hearing consistent with this opinion.