Smith v. State ( 2022 )


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  •   NOTICE: This opinion is subject to modification resulting from motions for reconsideration under Supreme Court
    Rule 27, the Court’s reconsideration, and editorial revisions by the Reporter of Decisions. The version of the
    opinion published in the Advance Sheets for the Georgia Reports, designated as the “Final Copy,” will replace any
    prior version on the Court’s website and docket. A bound volume of the Georgia Reports will contain the final and
    official text of the opinion.
    In the Supreme Court of Georgia
    Decided: December 20, 2022
    S22A1051. SMITH v. THE STATE.
    PETERSON, Presiding Justice.
    Nineteen years ago, Danyel Smith was convicted of the murder
    of his infant son based on a theory of “shaken baby syndrome” (SBS).
    Smith now argues that the science regarding diagnosis of brain
    injuries in infants has changed so much since his trial that he is
    entitled to a new trial based on a new expert affidavit ruling out
    battery or shaking as the cause of the baby’s death. The trial court
    rejected that argument and denied Smith’s extraordinary motion for
    new trial without a hearing. Because Smith’s extraordinary motion
    alleged facts that, if proven, may warrant relief, the trial court was
    not authorized to deny the motion without a hearing. We therefore
    vacate the trial court’s ruling on the motion and remand for further
    proceedings.
    1.   Background
    a.   Trial, conviction, and appeal
    Smith was convicted of felony murder and aggravated battery
    in connection with the death of his infant son. This Court affirmed
    his convictions in 2008. See Smith v. State, 
    283 Ga. 237
     (
    657 SE2d 253
    ) (2008). In that decision, in the light most favorable to the
    verdicts, we summarized the evidence presented at Smith’s
    November 2003 trial as follows:
    [O]n April 29, 2002, two-month-old Chandler was taken
    by his parents, Marsha Collins and Smith, to his
    pediatrician for a checkup. Following the checkup,
    Chandler was declared to be in good health. Chandler was
    then released from the doctor’s office and into his parents’
    care. On the way home, the family stopped at a QuikTrip
    gas station. That afternoon, Collins left Chandler with
    Smith while she attended an appointment to apply for
    WIC public assistance. While Collins was at her
    appointment, she called Smith and told him to bring the
    baby to the WIC office. While Smith was en route to
    Collins’ location with Chandler, Collins called him again,
    and Smith told Collins that Chandler was not breathing.
    Smith arrived at the WIC office with Chandler, who was
    limp and cold and had blood running from his nose.
    Collins called 911, and emergency responders rushed
    Chandler to the emergency room. At the emergency room,
    Chandler’s heartbeat was restored, but he remained
    comatose, unresponsive, and unable to breathe on his
    2
    own. A CT scan of Chandler’s brain revealed a skull
    fracture, a hematoma, and swelling of the brain. Based on
    the CT scan as well as Chandler’s broken wrists, retinal
    hemorrhages, and the quick onset of his symptoms,
    Chandler was diagnosed as a “shaken baby,” who had
    been subjected to vigorous shaking that was probably
    coupled with impact. Smith was the only person with
    Chandler during and immediately prior to the onset of his
    symptoms. The nature of Chandler’s injuries did not
    indicate that they were self-inflicted, and the injuries
    were inconsistent with a simple fall or accidental trauma.
    After seven days in the hospital without any evidence of
    brain function, Chandler was removed from life support
    and died on May 6, 2002. A physical examination of
    Chandler’s body after his death revealed abdominal
    bruising that was consistent with the spacing of adult
    knuckles.
    Id. at 237-238 (1).
    Dr. Anne Frankel, the pediatrician who saw Chandler for a
    check-up hours before he became nonresponsive, testified at trial
    that    there   were   complications   during   Chandler’s   mother’s
    pregnancy and that Chandler was born prematurely via Caesarean
    section (“C-section”). She testified that Chandler could not have had
    a life-threatening brain injury when she saw him on April 29, 2002.
    Dr. William Boydston, a pediatric neurosurgeon who treated
    Chandler after he arrived at the hospital, testified that he had
    3
    concluded that Chandler had experienced a brain injury due to
    shaking, based on Chandler’s retinal subdural hematomas, blood
    clots of various ages, skull fracture, abdominal bruising, wrist
    fractures, and lack of a documented history of physical trauma or
    other medical history to explain his injuries. The State also
    presented the testimony of Dr. Steven Dunton, who both examined
    Chandler at the hospital in his role as a forensic pediatrician for the
    hospital and performed Chandler’s autopsy as the county medical
    examiner. At trial, Dr. Dunton testified that Chandler died by
    homicide as a result of blunt-force head trauma. He acknowledged
    that some of the things he observed in Chandler could be explained
    by something other than abuse. But Dr. Dunton ultimately made “a
    collection of findings . . . that are classic and in some cases virtually
    exclusive for violent shaking.”
    There was evidence presented at trial that, several weeks
    before Chandler became unresponsive, his mother had summoned
    emergency medical assistance for Chandler due to a concern about
    breathing problems or a seizure. Dr. Boydston testified that the
    4
    medical history of Chandler that was provided to him did not
    reference seizures, but knowing Chandler had such a history would
    not change his conclusion. Dr. Dunton acknowledged on cross-
    examination that, prior to completing his autopsy report, he was not
    made aware of the prior request for emergency medical assistance
    for Chandler due to a possible seizure.
    In his trial testimony, Smith was adamant that he did not
    shake, punch, beat, or kick Chandler, and that Chandler never
    experienced a fall in his presence. Smith’s trial counsel emphasized
    in his closing argument that Chandler’s mother also had access to
    the baby on the day he became nonresponsive and raised questions
    about her credibility. He did not challenge the expert medical
    testimony directly, although he noted Dr. Dunton’s testimony that
    he had been unaware of the prior call for medical care due to a
    possible seizure, argued that Dr. Dunton had a conflict of interest
    given his two roles in the matter, and suggested that unskillful CPR
    performed on Chandler may have caused the baby’s various injuries.
    Smith was convicted of felony murder (predicated on first-
    5
    degree child cruelty) and aggravated battery, and moved for a new
    trial. He raised several claims of ineffective assistance of counsel,
    including that trial counsel had failed to investigate competently the
    medical evidence prior to trial — relying on an inadequate review
    by the defense expert — and failed to present additional medical
    evidence at trial. Smith argued that a “competent expert” would
    have concluded that Chandler suffered a head injury shortly before
    a seizure that he experienced in March 2002 — when Collins and
    other people besides Smith had access to the child. Smith also
    suggested that vaccinations may have been a cause of Chandler’s
    death, given that he was born prematurely and was predisposed to
    seizures. At the 2007 hearing on the motion for new trial, Smith
    presented the expert testimony of a forensic pathologist who opined
    that Chandler’s skull fracture was the result of a birth injury or an
    injury that occurred after he was discharged from the hospital after
    birth but before paramedics were summoned to his home due to a
    possible seizure. This injury led to another, fatal seizure on April 29,
    2002, he said. The pathologist testified at the motion-for-new-trial
    6
    hearing that the SBS theory was “very controversial,” saying that
    “there are a number of [academic] papers denying its existence.”
    The trial court denied the motion for new trial. In our 2008
    opinion affirming Smith’s convictions, we said that evidence
    supported the conclusion that counsel made a reasonable decision
    not to pursue additional medical investigations after consulting with
    his expert, who believed that Chandler’s injuries were consistent
    with physical abuse that occurred on the day alleged by the State.
    See Smith, 283 Ga. at 238-239 (2) (a).
    b.   Extraordinary motion for new trial
    In March 2021, Smith filed an extraordinary motion for new
    trial. Relying on an expert affidavit, various academic journal
    articles, and position papers by the American Academy of Pediatrics
    (“AAP”), the motion described a major shift in how the medical
    community thinks about infant head trauma, from generally
    presuming child abuse when an infant presents with head injuries,
    to instead requiring a full examination of the child’s medical record,
    including the circumstances of the child’s birth. As the motion
    7
    framed the issue, a hypothesis was “well-entrenched in the medical
    and legal communities” at the time of Smith’s trial that violent
    shaking was presumptively to blame when an infant presented with
    “the triad” of subdural hemorrhage, retinal hemorrhages, and
    cerebral edema, with long falls (as from a multi-story building) and
    car crashes the only other possible explanations for the combination
    of those three symptoms. Smith cited a 2001 AAP position paper,
    which stated that “[t]he constellation of” injuries associated with
    SBS “does not occur with short falls, seizures, or as a consequence of
    vaccination.” Amer. Acad. of Pediatrics, Comm. on Child Abuse &
    Neglect, Shaken Baby Syndrome: Rotational Cranial Injuries —
    Technical Report, 108 Pediatrics 206 (2001).
    Smith’s extraordinary motion said that a major shift in the
    medical community’s thinking began in 2006 when the National
    Association of Medical Examiners withdrew a position paper
    endorsing the “triad” as diagnostic of SBS. The medical community
    increasingly began to accept the idea that the “triad” of symptoms
    once considered diagnostic of SBS may also be caused by birth
    8
    injuries, short falls, or other diseases, the motion posited. The
    motion cited a 2009 position paper by the AAP indicating that
    “[m]edical diseases” can “mimic” the presentation of abusive head
    trauma (AHT), a broader term that includes head injury due to
    shaking. See Am. Acad. of Pediatrics, Comm. on Child Abuse &
    Neglect, Abusive Head Trauma in Infants and Children, 123
    Pediatrics 1409 (2009).
    Smith emphasized a 2018 position paper by the AAP and other
    professional organizations (“2018 Consensus Statement”). See A.K.
    Choudhary et al., Consensus Statement on Abusive Head Trauma in
    Infants and Young Children, 48 Pediatric Radiology 1048 (2018).
    The 2018 Consensus Statement, which framed itself as “intended to
    help courts improve the scientific accuracy of their decisions,”
    decried “denialism of child abuse” and contentions by defense
    attorneys and their expert witnesses proffering “speculative
    causation theories” — including birth-related injuries — as
    alternative diagnoses in child abuse cases. The statement called the
    notion of a “triad” of symptoms as diagnostic of AHT a “straw man”
    9
    “fallacy” that is “a legal argument and not a medically valid term.”
    Smith framed the 2018 Consensus Statement as “mandat[ing]” for
    the first time “that pediatricians presented with patients whose
    diagnosis previously would have defaulted to AHT must now
    thoroughly investigate the possibility of alternative causes.” Smith
    claimed that the 2018 Consensus Statement represented the AAP’s
    first recognition of birth trauma as an “alternative diagnosis” for the
    sort of symptoms presented by Chandler. Citing a 2020 journal
    article and his expert’s affidavit, Smith also posited that “[t]oday it
    is known that vaccinations, including Hepatitis B, can cause
    seizures and encephalopathy even in healthy infants” and that “the
    modern medical literature recognizes that prematurity and other
    health conditions must be accounted for in vaccine administration.”
    The expert affidavit attached to Smith’s motion was provided
    by the chair of neurosurgery at Mount Sinai West and Mount Sinai
    Morningside, Dr. Saadi Ghatan, opining that the cause of Chandler’s
    death was pre-existing conditions resulting from birth injury and
    other events, and not from SBS. In his affidavit, Dr. Ghatan cited
    10
    several ways in which the medical understanding of infant head
    injuries has changed since the time of Smith’s trial. Regarding
    Chandler’s death in particular, Dr. Ghatan explained how various
    events — including acute fetal distress prior to Chandler’s birth,
    prolonged labor by his mother, premature delivery via C-section and
    vacuum extraction, and prior seizures — led to a brain injury that
    was exacerbated by two things that happened shortly before
    Chandler became non-responsive and stopped breathing: a seven-
    hour car ride the night before (that would have left a young infant
    dehydrated) and vaccinations received the same day. 1 Dr. Ghatan
    also explained how the medical evidence, in the light of current
    medical understanding, ruled out conclusions that Chandler’s death
    was a result of battery or shaking: Chandler did not present with
    the sort of injuries that one would expect to see in a “battered” or
    1 In explaining how routine infant vaccinations could have been so
    problematic for Chandler, Dr. Ghatan noted Chandler’s low birth weight of four
    pounds, seven ounces, and that “he received more vaccinations than
    customary, and at an accelerated pace”; the extraordinary motion averred that
    Chandler had accidentally been given two doses of the Hepatitis B vaccine
    during his initial neonatal hospitalization, such that the shot he received on
    April 29, 2002, was an “overdose.”
    11
    “shaken” baby. Dr. Ghatan also posited that Chandler’s abdominal
    bruising was caused by CPR performed on him by untrained
    persons. Dr. Ghatan added that he did not intend to suggest that the
    doctors who “handled” Chandler’s case did anything improper under
    the standard of care at the time, but were working with a now-
    outdated framework.
    Without holding an evidentiary hearing, the trial court denied
    the extraordinary motion for new trial. 2 Smith filed a discretionary
    application, which we granted. The case was orally argued before
    this Court on October 4, 2022.
    2.    Analysis
    In denying Smith’s extraordinary motion, the trial court
    concluded that the sort of expert opinion he offered could never
    constitute newly discovered evidence requiring a new trial. The
    court also concluded that Smith had failed to satisfy two of the
    requirements for obtaining a new trial based on newly discovered
    2 The trial court initially dismissed the motion, but then entered a new
    order denying it.
    12
    evidence. Because we conclude that the trial court was wrong to
    deny the motion on these bases without first affording Smith an
    evidentiary hearing, we vacate the trial court’s order and remand
    for further proceedings.
    “All motions for new trial, except in extraordinary cases, shall
    be made within 30 days of the entry of the judgment on the
    verdict[.]” OCGA § 5-5-40 (a). “When a motion for a new trial is made
    after the expiration of a 30 day period from the entry of judgment,
    some good reason must be shown why the motion was not made
    during such period, which reason shall be judged by the court.”
    OCGA § 5-5-41 (a). Under some circumstances, newly discovered
    evidence may authorize the grant of an extraordinary motion for
    new trial:
    A new trial may be granted in any case where any
    material evidence, not merely cumulative or impeaching
    in its character but relating to new and material facts, is
    discovered by the applicant after the rendition of a verdict
    against him and is brought to the notice of the court
    within the time allowed by law for entertaining a motion
    for a new trial.
    OCGA § 5-5-23; see also Mitchum v. State, 
    306 Ga. 878
    , 880-882 (1)
    13
    (a) (
    834 SE2d 65
    ) (2019).
    As we framed the requirements in Timberlake v. State, 
    246 Ga. 488
     (
    271 SE2d 792
    ) (1980):
    It is incumbent on a party who asks for a new trial on the
    ground of newly discovered evidence to satisfy the court:
    (1) that the evidence has come to his knowledge since the
    trial;
    (2) that it was not owing to the want of due diligence that
    he did not acquire it sooner;
    (3) that it is so material that it would probably produce a
    different verdict;
    (4) that it is not cumulative only;
    (5) that the affidavit of the witness himself should be
    procured or its absence accounted for; and
    (6) that a new trial will not be granted if the only effect of
    the evidence will be to impeach the credit of a witness.
    
    Id. at 491
     (1) (citation and punctuation omitted). “Failure to show
    one requirement is sufficient to deny a motion for a new trial.” State
    v. Gates, 
    308 Ga. 238
    , 250 (3) (
    840 SE2d 437
    ) (2020) (citation and
    punctuation omitted). “Extraordinary motions for new trial are not
    favored, and a stricter rule is applied to an extraordinary motion for
    new trial based on the ground of newly available evidence than to
    14
    an ordinary motion on that ground.” 
    Id.
     (citation and punctuation
    omitted). But “[w]here a defendant pleads [facts sufficient to
    authorize that the motion be granted if the facts developed at the
    hearing warrant such relief] in his extraordinary motion and
    submits supporting affidavits, a trial court errs by ruling on the
    motion without first holding an evidentiary hearing.” Stinchcomb v.
    State, 
    308 Ga. 870
    , 875 (2) (
    843 SE2d 847
    ) (2020). “Whether a
    defendant has pleaded sufficient facts to entitle him to a hearing is
    a question of law that we review de novo.” 
    Id.
    Before   the   trial   court,    the   State   contested   Smith’s
    extraordinary motion on only two of the Timberlake requirements,
    arguing that Smith had not shown that the motion was in fact based
    on evidence that had come to his knowledge since trial or that he
    had acted with due diligence. In its March 2022 order denying
    Smith’s extraordinary motion for new trial, the trial court found that
    Smith had failed to meet his burden as to at least those two
    requirements. As to the first requirement, the court found that the
    sort of evidence offered as new — a different expert interpretation
    15
    of the medical records that were used at trial — categorically did not
    meet the definition of newly discovered evidence. Moreover, the trial
    court determined, the substance of the expert opinion on which
    Smith relies — in particular, “expert opinion to challenge the
    scientific basis of shaken baby diagnosis” — “has been available
    since the 1990s and was available at the time of the Defendant’s
    trial[,]” and so was not “newly discovered.” The trial court concluded
    that, for similar reasons, Smith also had failed to satisfy the second
    Timberlake requirement because he had not shown that he could not
    have obtained through due diligence a medical expert to challenge
    at trial the medical conclusions of the State’s experts.
    We begin our analysis by explaining why the trial court was
    not correct to conclude that the sort of evidence at issue here cannot
    qualify as newly discovered evidence.
    a.   The trial court erred by categorically rejecting Smith’s
    evidence as a basis for a new trial on the ground that it
    was opinion evidence, without holding a hearing.
    In reaching his conclusion that Smith could not satisfy the first
    Timberlake requirement, the trial court concluded that the sort of
    16
    expert opinion evidence offered could never qualify as newly-
    discovered evidence:
    In this case, the Defendant has not shown newly
    discovered evidence at all. Instead, he offers a different
    interpretation of the medical records used at trial through
    a new expert witness. In his Affidavit, Dr. Ghatan relies
    exclusively on the same medical records that were always
    available to the Defendant at trial. . . . Expert opinion
    does not constitute “new and material facts” but merely
    “opinion evidence [which] fails to constitute newly
    discovered evidence.” Wesleyan Coll. v. Weber, 
    238 Ga. App. 90
    , 97 [
    517 SE2d 813
    ] (1999).
    The trial court erred.
    The text of the relevant statute does not exclude expert opinion
    evidence from the sort of evidence that may provide the basis for an
    extraordinary motion for new trial. OCGA § 5-5-23 provides that the
    new evidence supporting such a motion may include “any material
    evidence, not merely cumulative or impeaching in its character but
    relating to new and material facts,” that is discovered by the
    applicant after trial and presented to the court with the requisite
    diligence. Of course, expert opinion testimony is “evidence.” See, e.g.,
    OCGA § 24-7-701 (b) (“Direct testimony as to market value is in the
    nature of opinion evidence.” (emphasis supplied)); OCGA § 24-7-702
    17
    (f) (“It is the intent of the legislature that, in all proceedings, the
    courts of the State of Georgia not be viewed as open to expert
    evidence that would not be admissible in other states.” (emphasis
    supplied)); OCGA § 24-7-703 (“If [particular facts or data are] of a
    type reasonably relied upon by experts in the particular field in
    forming opinions or inferences upon the subject, such facts or data
    need not be admissible in evidence in order for the opinion or
    inference to be admitted.” (emphasis supplied)). It may be that expert
    opinion evidence does not fall within the term “facts,” but the text of
    OCGA § 5-5-23 does not provide that the evidence in question must
    itself be “new and material facts.” It requires only that the evidence
    must be “relating to new and material facts.” Expert opinion
    testimony may, indeed, relate to new and material facts.
    The case law relied on by the trial court here does not demand
    a conclusion that expert opinion testimony can never support an
    extraordinary motion for new trial, either. Although the Court of
    Appeals opinion in Wesleyan College, cited by the trial court,
    included language suggesting that such evidence could not
    18
    constitute new evidence under OCGA § 5-5-23 because it was expert
    testimony, the opinion also described the proposed testimony as
    “cumulative” and “impeaching,” 
    238 Ga. App. at
    96-97 — aspects of
    the evidence that, under Timberlake, likely would have doomed it as
    a basis for a motion for new trial. Moreover, there was no suggestion
    in Wesleyan College that the evidence — an opinion by the plaintiff’s
    former expert that the landowner-defendant could not have foreseen
    that a particular tree would have fallen — was based on new
    scientific developments or other facts that had become known to the
    defendant after trial. See 
    238 Ga. App. at 95-96
    .3 The decision of this
    Court on which Wesleyan College relied also involved evidence that
    was merely impeaching, and, with little description of the evidence
    at issue, the opinion of this Court in that case contains no indication
    that the evidence was related to any new facts. See Allen v. State,
    3 Indeed, the expert who offered the “new” opinion inspected the tree
    prior to trial. See Wesleyan College, 
    238 Ga. App. at 96
    . The dissent insisted
    that because the expert in question examined the tree well before the experts
    who testified for the plaintiff at trial, that expert’s testimony “established facts
    which he had a unique opportunity to observe; he was not merely an opinion
    witness.” Id. at 99 (Smith, J., dissenting).
    19
    
    187 Ga. 178
    , 180 (1) (
    200 SE 109
    ) (1938) (“Aside from the fact that
    [the evidence in question] is largely or entirely opinionative, newly
    discovered evidence that is merely impeaching in character affords
    no legal reason for the grant of a new trial.”).
    Other decisions of this Court rejecting expert opinion evidence
    as a basis for granting a motion for new trial also did so on the
    grounds that the evidence was merely impeaching, without
    indicating that those opinions were related to new facts. See Ruger
    v. State, 
    263 Ga. 548
    , 551 (2) (c) (
    436 SE2d 485
    ) (1993) (affirming
    denial of motion for new trial based on expert opinion that method
    employed by State’s expert in conducting experiment about
    bloodprints was “scientifically unsound”; new opinion “tendered to
    disprove the facts on which the [testimony of the State’s expert] was
    founded”); Wright v. State, 
    184 Ga. 62
    , 71 (9) (
    190 SE 663
    ) (1937)
    (rejecting expert affidavit challenging State’s testimony about
    substance found on pipes near defendant’s workplace as basis for
    20
    new trial, as it was “impeaching”). 4 Rejecting a motion purportedly
    based on newly-discovered evidence on the ground that the expert
    opinion evidence at issue was “impeaching” — a problem that is at
    least potentially fatal under the Timberlake standard — is not the
    same as saying that expert opinion evidence can never support an
    extraordinary motion for new trial. Nothing in our case law
    categorically excludes expert opinion evidence from serving as the
    basis for an extraordinary motion for new trial premised on newly
    discovered evidence.
    And the conclusion that new expert analysis of existing
    physical evidence may constitute new evidence justifying the grant
    of an extraordinary motion for new trial accords with a recent
    decision of this Court. In State v. Gates, we affirmed the grant of an
    extraordinary motion for new trial based on analysis of DNA
    evidence through the TrueAllele software, which was not available
    4In Rogers v. State, 
    257 Ga. 590
     (
    361 SE2d 814
    ) (1987), relied on in
    Ruger, we concluded that the affidavit of a pathologist who challenged various
    aspects of the State’s expert testimony failed to satisfy the Timberlake
    standard, but we didn’t say why. See 
    id. at 591
     (2) (a).
    21
    to the parties at the time of the trial in that case. See 308 Ga. at 264
    (3) (b). We rejected various challenges by the State to the reliance
    on this analysis as a basis for granting a new trial, including that
    the defendant showed insufficient diligence:
    The State first argues that Gates should have brought his
    extraordinary motion much earlier, given the prevalence
    of DNA evidence in criminal proceedings since at least the
    1990s. . . . As the State implicitly concedes by that
    argument, however, the “newly discovered evidence” in
    this case is not simply the DNA found on the belt and tie,
    or even the GBI’s initial inconclusive test results for them.
    Those items, that DNA, and those results, have little
    value to Gates’ case because the GBI’s human
    interpretation of the DNA results was inconclusive. It was
    instead the TrueAllele analysis of those results that
    yielded Gates newly discovered evidence on which he
    could stake a claim to a new trial. Because the record
    established that the TrueAllele software had the ability
    to provide probative analysis of complex and degraded
    DNA mixtures in a way that traditional human methods
    could not (and apparently, to this day, cannot), it was not
    necessary under Timberlake for Gates to have sought
    TrueAllele analysis of the DNA located on the belt and tie
    at any point prior to 2005 when TrueAllele was first used.
    308 Ga. at 257 (3) (a) (iii). We used the shorthand “TrueAllele
    analysis” in describing the evidence at issue, but the evidence
    ultimately came in the form of expert testimony by the creator of the
    TrueAllele software: namely, “that the TrueAllele software
    22
    determined that Gates is excluded as a contributor to the DNA
    mixture on” the physical evidence at issue. Id. at 250 (3). Although
    our opinion in Gates did not address specifically the question of
    whether expert opinion testimony was categorically in the realm of
    “new” evidence that supports an extraordinary motion for new trial
    — the parties and the Court appear to have assumed that it was —
    Gates is consistent with the notion that new expert analysis of
    existing physical evidence may constitute newly discovered evidence
    supporting a grant of an extraordinary motion for new trial.
    The trial court thus erred by denying Smith’s extraordinary
    motion on the basis that “[e]xpert opinion does not constitute ‘new
    and material facts’” and “opinion evidence . . . fails to constitute
    newly discovered evidence[,]” without considering whether the
    expert opinion that is offered as the primary support for Smith’s
    motion relates to new and material facts. We will leave that ultimate
    determination for the trial court to make in the first instance. But
    Smith certainly has offered a pleading sufficient to satisfy that
    standard for purposes of obtaining a hearing. On its face, Dr.
    23
    Ghatan’s opinion purports to be based on new and material facts. In
    particular, his affidavit makes a number of factual assertions about
    the development of the medical understanding of infant head
    injuries since the time of Smith’s trial:
    • “Experience documented since 2002 shows that the
    obstetrician’s hands, a knife, vacuum, and forceps used during
    any C-section can all cause trauma to a baby’s head[.]”
    • Although Chandler’s medical team did not scan Chandler’s
    head following his birth despite swelling to his head —
    “appropriately so in 2002” — “[w]ith the more recent
    application of ultrasound technology, where there is no
    radiation exposure, we routinely document a much higher
    frequency of skull fractures and traumatic brain injuries in
    infants due to birth and incidental traumas than was done so
    two decades ago.”
    • “Since the time of Chandler’s death, significant experience has
    been accumulated regarding the risk of seizures with
    vaccinations, which would only exacerbate the susceptibility of
    the brain of an infant such as Chandler, to experience a
    seizure.”
    • “Retinal hemorrhages, which . . . were commonly assumed to
    be due to non-accidental trauma 20 years ago, today are known
    to be associated with myriad causes such as stroke, raised
    intracranial pressure, and the nervous system being starved of
    oxygen.”
    • In the two decades since Chandler’s death, “our perspective on
    child abuse and intentional brain injury has evolved” such that
    24
    in a case of non-accidental trauma one would expect to see
    injuries not observed in Chandler when he presented at the
    hospital nonresponsive.
    • “In 2002, the neurodiagnostic literature was rife with the belief
    that chronic subdural hematomas and acute subdural blood,
    when seen on the same CT scan, were commonly associated
    with abuse. Twenty years later, we know that infants who
    undergo scanning in the first four months of life often have
    chronic subdural hematomas and other fluid collections related
    to birth trauma. Twenty years later, we also know that there
    can be components of acute blood within the chronic fluid that
    are not necessarily caused by non-accidental trauma, but by
    trivial bumps or other metabolic causes.”
    • “[T]he standard of care has changed dramatically in the last
    twenty years thanks to advances in science and technology. In
    2002 and 2003, the standard of care was to diagnose the
    symptoms observed in Chandler as the result of abuse, absent
    specific diseases or a known, large-scale accident. Today,
    unlike in 2002-2003, the diagnostic procedures and attention
    to particular details in a child head trauma case is entirely
    different.”
    These pleadings at the very least allege facts that, if proved at the
    hearing, would be sufficient to warrant a conclusion that the opinion
    offered in support of the motion relates to new and material facts.
    See Stinchcomb, 308 Ga. at 875 (2). The trial court thus erred by
    denying the motion without a hearing on the basis that Dr. Ghatan’s
    expert opinion was categorically excluded from the statutory
    25
    definition of newly discovered evidence.
    b.   The trial court erred by denying the extraordinary motion
    without a hearing on the basis that Smith had failed to
    show that his motion was based on evidence that has come
    to his knowledge since the trial.
    In addition to concluding that opinion evidence could never
    constitute newly discovered evidence, the trial court also denied
    Smith’s motion on the ground that Smith could not obtain relief
    because he had failed to show that the particular evidence on which
    his motion was based has come to his knowledge since the trial.
    Smith argues on appeal that the trial court erred in making these
    findings without an evidentiary hearing. Here as well, we agree.
    The trial court broadly concluded based on two articles that
    “[t]his type of expert opinion [offered by Dr. Ghatan] has been
    available since the 1990s,” such that Smith had failed to show that
    his motion was based on evidence that has come to his knowledge
    since the time of trial. But, on its face, Dr. Ghatan’s particular
    opinion could not have been offered at the time of trial, let alone in
    the 1990s. As detailed above, Dr. Ghatan’s opinion as outlined in his
    affidavit purports to be based on developments that occurred after
    26
    trial. Moreover, the extraordinary motion itself contains several
    statements of fact to the effect that the medical community’s
    approach to infant head trauma has changed since the time of
    Smith’s trial. In particular, the motion states that, around the time
    of Smith’s trial, medical schools taught that shaking was the
    primary or exclusive cause of the so-called “triad” of subdural
    hemorrhage, retinal hemorrhages, and cerebral edema — and the
    AAP also took the position that this “constellation” of symptoms
    gave rise to a presumption of abuse and did not occur with short
    falls, seizures, or as a consequence of vaccination. Now, the motion
    states, “the medical and pediatric community agree that child abuse
    is no longer the presumptive diagnosis when an infant presents with
    head injuries. Instead, a thorough examination of the full medical
    record is necessary, as it may reveal one of numerous possible
    alternative and unintentional causes, including birth trauma.”
    Many of these factual assertions in the motion and affidavit involve
    research, clinical observations, or organizational changes of position
    occurring after the time of trial. Assuming for the sake of our
    27
    analysis the truth of these statements in the extraordinary motion
    and supporting affidavit, Smith could not have discovered prior to
    trial the same factual and opinion evidence that he offers now.5
    In addition to differences between Dr. Ghatan’s actual expert
    opinion as expressed in his affidavit and a hypothetical “type of
    expert opinion” that might have been offered 19 years ago, Dr.
    Ghatan’s opinion is offered against the backdrop of the post-trial
    scientific developments that he references. As pleaded, those
    developments may make Dr. Ghatan’s actual opinion more credible
    than a hypothetical, similar opinion that might have been offered at
    the time of trial, in ways that are, in the parlance of the Timberlake
    requirements, “so material that [they] would probably produce a
    different verdict.” 
    246 Ga. at 491
     (1).6
    5 Some of us are skeptical that changes in position by professional or
    other organizations — as opposed to the scientific studies that may or may not
    underlie those positions — are themselves so material that they would
    probably produce a different verdict. But this appeal does not require us to
    decide that question.
    6 Moreover, to say that an expert willing to offer a similar opinion might
    have been found in the past is not to say that such an opinion would have been
    admissible at that time. Although neither party appears to have argued
    explicitly that Dr. Ghatan’s testimony would have been inadmissible had it
    28
    been offered at the time of trial, Smith does argue that “it is only in the recent
    past that enough scientific research has been peer-reviewed and published to
    refute the shaken baby hypothesis as it was presented at the trial of this case”
    and that “[t]his established medicine did not previously exist” such that he
    “could not have presented it” at trial. The State implies that Dr. Ghatan’s
    testimony might not be admissible even today. At any rate, we observe that if
    an expert opinion would not have been admissible at a particular time in the
    past, that expert opinion cannot be said to be “evidence” that could have been
    discovered by the defendant at that particular time. Cf. Timberlake, 
    246 Ga. at 491
     (1) (“Implicit in [the] six requirements for [granting a new trial on the basis
    of newly discovered evidence] is that the newly discovered evidence must be
    admissible as evidence.”). Until recently, the “opinions of experts on any
    question of science” were generally admissible in criminal cases. See former
    OCGA § 24-7-707 (2013); see also Debelbot v. State, 
    305 Ga. 534
    , 542 (2) (
    826 SE2d 129
    ) (2019) (noting that many of the State’s challenges to medical
    evidence proffered by the defendants may “be more properly characterized as
    challenges to the qualification of the witnesses as experts or to the
    persuasiveness of the experts’ testimony in the light of conflicting testimony
    from the State’s experts”). But trial courts still were empowered to exclude
    expert testimony based on a particular “procedure or technique” on the ground
    that it had not “reached a scientific stage of verifiable certainty[.]” Harper v.
    State, 
    249 Ga. 519
    , 525 (1) (
    292 SE2d 389
    ) (1982); see also, e.g., Riley v. State,
    
    278 Ga. 677
    , 683 (4) (
    604 SE2d 488
    ) (2004) (trial court did not abuse discretion
    in refusing under Harper to allow expert testimony on “false-confession
    theory”). Under that approach, trial courts were cautioned against “simply
    calculating the consensus in the scientific community.” Harper, 
    249 Ga. at 526
    (1). The General Assembly recently has amended the Evidence Code, however,
    to extend to criminal cases the federal standard of admissibility of expert
    testimony articulated in Daubert v. Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
     (113 SCt 2786, 125 LE2d 469) (1993), and its progeny. See 2022 Ga.
    Laws, p. 201, § 1 (amending OCGA § 24-7-702). Under that standard, a trial
    court must evaluate the reliability of the expert’s proffered testimony; proper
    considerations include “whether a theory or technique can be tested, whether
    it has been subjected to peer review and publication, the known or potential
    rate of error for the theory or technique, the general degree of acceptance in
    the relevant scientific or professional community, and the expert’s range of
    experience and training.” HNTB Georgia, Inc. v. Hamilton-King, 
    287 Ga. 641
    ,
    642 (1) (
    697 SE2d 770
    ) (2010).
    29
    Rather than assuming the truth of the statements found in
    Smith’s extraordinary motion and supporting affidavit for purposes
    of arguing that the motion was properly denied without a hearing,
    however, the State insists on challenging the credibility of these
    statements. Citing various articles, the State argues that “the
    specific theory advanced here — that birth trauma could have been
    the cause of the victim’s injuries rather than shaken-baby syndrome
    — goes back nearly 30 years and was available in the 1990s, years
    before the Appellant’s trial.” The State also argues that Dr. Ghatan’s
    affidavit “merely offers the same type of expert opinions and theories
    — thoroughly discredited by the 2018 AAP Consensus Statement —
    that would have been available before his 2003 trial.” To the extent
    that the State challenges the credibility of the averments of Smith
    and his supporting expert that there in fact have been new
    developments in the scientific community’s understanding of infant
    trauma, or that Dr. Ghatan’s opinion is in fact based on those
    developments, the place for that is an evidentiary hearing. By not
    affording Smith a hearing in which he could show that he had
    30
    evidence about the cause of Chandler’s death materially different
    from that which could have been discovered, introduced, and
    admitted at the time of his trial, the trial court erred. See
    Stinchcomb, 308 Ga. at 875 (2) (trial court errs by denying
    extraordinary motion for new trial without a hearing where a
    defendant pleads facts sufficient to authorize that the motion be
    granted if the facts developed at the hearing warrant such relief).
    c.   The trial court erred by denying the extraordinary motion
    on the pleadings on the basis that Smith had failed to
    show that he had exercised due diligence.
    For similar reasons, the denial of Smith’s extraordinary motion
    on the due diligence prong without a hearing also was error. The
    trial court denied Smith’s extraordinary motion on the alternative
    ground that he could not satisfy the due diligence requirement
    because he had failed to show that he could not have found an expert
    to challenge the State’s expert at trial — again, saying that the “type
    of expert opinion” that Smith attempts to present now would have
    been available at the time of trial. But, again, assuming the truth of
    statements contained in the extraordinary motion and supporting
    31
    affidavit, Smith could not have discovered prior to trial the same
    factual and opinion evidence that he offers now. To the extent that
    the State challenges the credibility of the statements made in the
    extraordinary motion and supporting affidavit to the effect that
    scientific developments have in fact occurred subsequent to trial,
    and that Dr. Ghatan’s opinion is in fact based on those
    developments, that presents a factual dispute calling for a hearing.
    The   State   notes   that   “[t]he   statutes   which   control
    extraordinary motions for new trial based on newly discovered
    evidence require a defendant to act without delay in bringing such
    a motion.” Llewellyn v. State, 
    252 Ga. 426
    , 428 (2) (
    314 SE2d 227
    )
    (1984). The State argues that Smith has failed to show why he
    waited 18 years after his conviction and 13 years after his direct
    appeal to bring his “newly discovered evidence” to the court’s
    attention. The State suggests that, taking Smith’s extraordinary
    motion on its own terms, the scientific developments supporting that
    motion occurred well before a group of organizations issued the 2018
    Consensus Statement. In particular, the State noted, the motion
    32
    cited developments in 2006, 2011, and 2012.
    Although the State argued below that Smith could not “show
    that he exercised either pre-trial due diligence or subsequent due
    diligence[,]” the trial court appears to have limited its analysis of the
    due diligence prong to only whether Smith showed pre-trial due
    diligence. But even assuming that the issue of Smith’s post-trial
    diligence is properly before us, we cannot say that Smith’s pleadings
    as to his post-trial diligence were insufficient to require a hearing.
    Although the extraordinary motion indicates that a shift in the
    medical community’s understanding of abusive head trauma in
    infants began in 2006, it also alleges developments after that date.
    In addition to the 2018 Consensus Statement, the motion cites a
    2020 article about adverse events resulting from vaccination. It is
    true that Dr. Ghatan’s affidavit does not make clear when exactly
    the developments that he references occurred. But Dr. Ghatan’s
    affidavit repeatedly suggests that his analysis is based on fairly
    recent    developments      —     repeatedly    contrasting     medical
    understanding of infant head injuries at the time of Chandler’s
    33
    death with that of “today,” “twenty years later.” Moreover, as
    explained above, a defendant who brings an extraordinary motion
    for new trial based on new scientific developments cannot prevail
    unless those developments are “so material that [they] would
    probably produce a different verdict.” Timberlake, 
    246 Ga. at 491
     (1).
    And a convicted defendant may file only one extraordinary motion
    for new trial, see OCGA § 5-5-41 (b), so a prudent defendant
    predicating such a motion on scientific developments would wait
    until he is confident in the materiality of those developments.
    Although the State may have plenty of room to argue at a hearing
    that Smith did not act with sufficient diligence in bringing forth the
    evidence that is the basis for his motion, we cannot say as a matter
    of law that Smith’s pleadings are insufficient to even obtain a
    hearing on that point. The trial court erred in denying the motion
    without a hearing on the ground that Smith had failed to show that
    he acted with due diligence. See Stinchcomb, 308 Ga. at 879 (2) (b)
    (concluding that trial court erred in denying extraordinary motion
    34
    based on due diligence factor without a hearing). 7
    3.    Conclusion
    In sum, the trial court erred by denying Smith’s extraordinary
    motion for new trial on the ground that it was based on opinion
    evidence that could never support such a motion. The trial court also
    erred by denying the motion, without a hearing, on the alternative
    bases that Smith had not shown that that his motion was based on
    evidence that has come to his knowledge since the trial or that he
    had brought that evidence to the court’s attention with due
    diligence. The State has not opposed Smith’s bid for a hearing on
    7 In his briefing before this Court, Smith argues that we should grant
    him a new trial outright, because he satisfied the first two Timberlake
    requirements through his written submissions and the State did not contest
    the other requirements below, arguing only in the alternative that this Court
    should remand the case for an evidentiary hearing. But Smith cites no
    authority for mandating that his extraordinary motion be granted at this
    stage. Even if the State has waived its right to contest Smith’s motion based
    on certain Timberlake requirements — an issue we need not resolve here —
    our conclusion that Smith has satisfied the pleading standard as to the
    Timberlake requirements the State contested below means only that he is
    entitled to a hearing, not that he is entitled to a new trial. To secure a new
    trial, Smith will still need to prove that these requirements have been met. See
    Timberlake, 
    246 Ga. at 491
     (1) (“It is incumbent upon a party who asks for a
    new trial on the ground of newly discovered evidence to satisfy the court” as to
    the six requirements. (citation and punctuation omitted; emphasis supplied)).
    35
    other grounds. We therefore vacate the trial court’s order denying
    the motion and remand for the trial court to consider the motion
    anew after affording Smith an evidentiary hearing.
    Judgment vacated and case remanded with direction. All the
    Justices concur.
    36