State v. Walker ( 2019 )


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    STATE OF CONNECTICUT v. EUGENE L. WALKER
    (SC 20101)
    Robinson, C. J., and Palmer, McDonald,
    D’Auria, Mullins and Ecker, Js.
    Syllabus
    Convicted of the crimes of felony murder, manslaughter in the first degree
    with a firearm, attempt to commit robbery in the first degree, and
    criminal possession of a pistol or revolver in connection with the shoot-
    ing death of the victim, the defendant appealed to the Appellate Court,
    claiming that his federal constitutional right to confront the witnesses
    against him had been violated by the admission of certain evidence
    connecting him to the shooting. At trial, a supervisory forensic analyst
    employed by the state, D, testified that the defendant was a major
    contributor to the DNA on a bandana that had been found at the crime
    scene and that allegedly had been worn by the person who shot the
    victim. In conjunction with D’s testimony, the state also introduced into
    evidence a written report signed by D containing specific numerical
    DNA profiles from the bandana and a postarrest buccal swab of the
    defendant’s mouth that had previously been conducted pursuant to a
    court order. D testified that, although she analyzed the DNA on the
    bandana and conducted the ultimate comparison, the numerical DNA
    profile from the defendant’s buccal swab had been generated by another
    forensic analyst or analysts. Although D had neither participated in nor
    observed the analysis of the defendant’s buccal swab, D testified that
    she had received paperwork showing that standard laboratory proce-
    dures had been followed and explicitly swore to the accuracy of the
    resulting numerical DNA profile. On appeal to the Appellate Court, the
    defendant claimed that the evidence regarding the numerical DNA profile
    that had been presented through D contained testimonial hearsay and
    that he had been deprived of his right to confrontation because the state
    had failed to call a witness with personal knowledge of the testing of
    the buccal swab. The Appellate Court rejected that claim, concluding
    that, because D had conducted the ultimate analysis and made the
    resulting findings that connected the defendant’s DNA to the bandana,
    and because D testified and was subjected to cross-examination at trial,
    the defendant’s right to confrontation had not been violated. Although
    the Appellate Court vacated the defendant’s manslaughter conviction
    on a separate ground, it affirmed the trial court’s judgment in all other
    respects. On the granting of certification, the defendant appealed to
    this court, claiming that the introduction of evidence concerning his
    numerical DNA profile through D’s testimony violated his right to con-
    frontation. Held that the Appellate Court incorrectly concluded that the
    admission of D’s testimony concerning the numerical DNA profile from
    the defendant’s buccal swab did not violate the defendant’s right to
    confrontation, and, because the state did not advance a claim of harmless
    error, the defendant was entitled to a new trial: D’s testimony, which
    did not consist merely of her own independent opinion, introduced to
    the jury the other analyst’s or analysts’ out-of-court statements about
    the defendant’s numerical DNA profile, as D had explicitly referred to,
    relied on, and vouched for the accuracy of work by the other analyst
    or analysts that she did not perform or otherwise observe, and such
    evidence constituted hearsay in light of the state’s concession that it
    was offered to prove the truth of the matter asserted; moreover, the
    evidence relating to the defendant’s numerical DNA profile was testimo-
    nial in nature because it was created for the primary purpose of establish-
    ing the defendant’s guilt at trial, as the buccal swab was performed after
    the defendant had been arrested and charged with various crimes, was
    obtained by court order for comparison with any DNA found on the
    bandana discovered at the crime scene, and was processed in such a
    way that the evidentiary purpose of the buccal swab analysis would
    have been readily apparent to the analyst or analysts who conducted
    it; furthermore, although all analysts who participate in the process of
    generating a DNA profile need not testify, the state must call as a
    witness an analyst with personal knowledge concerning the accuracy of
    a numerical DNA profile, and, because D simply relayed to the jury the
    DNA profile that had been provided to her by the analyst or analysts
    and did not possess such knowledge with respect to the processing of
    the defendant’s buccal swab, D was not a sufficient substitute witness
    for purposes of the right to confrontation.
    Argued January 23—officially released August 13, 2019
    Procedural History
    Substitute information charging the defendant with
    the crimes of felony murder, manslaughter in the first
    degree with a firearm, attempt to commit robbery in
    the first degree, conspiracy to commit robbery in the
    first degree, and criminal possession of a pistol or
    revolver, brought to the Superior Court in the judicial
    district of Ansonia-Milford and tried to the jury before
    Markle, J.; verdict and judgment of guilty of felony
    murder, manslaughter in the first degree with a firearm,
    attempt to commit robbery in the first degree, and crimi-
    nal possession of a pistol or revolver, from which the
    defendant appealed to the Appellate Court, Alvord,
    Kahn and Bear, Js., which affirmed in part and reversed
    in part the judgment of the trial court and remanded
    the case for resentencing, and the defendant, on the
    granting of certification, appealed to this court.
    Reversed in part; new trial.
    John L. Cordani, Jr., assigned counsel, for the appel-
    lant (defendant).
    Timothy J. Sugrue, assistant state’s attorney, with
    whom, on the brief, were Margaret E. Kelley, state’s
    attorney, Cornelius Kelly, senior assistant state’s attor-
    ney, and Rocco A. Chiarenza, assistant state’s attorney,
    for the appellee (state).
    Opinion
    MULLINS, J. The sole issue in this certified appeal
    is whether Appellate Court correctly concluded that
    the defendant, Eugene L. Walker, failed to establish a
    violation of his right under the sixth amendment to the
    United States constitution to confront witnesses against
    him. Specifically, the defendant asserts that the state
    violated his right to confrontation by introducing evi-
    dence at trial that his DNA profile, which had been
    generated from a postarrest buccal swab, matched the
    DNA found on evidence from the crime scene without
    calling as a witness the analyst who processed the buc-
    cal swab and generated the DNA profile used in that
    comparison.
    The defendant’s DNA profile was created after his
    arrest in aid of an ongoing criminal investigation and
    under circumstances objectively indicating that it was
    created for the primary purpose of being used as evi-
    dence in the defendant’s criminal case. In addition, the
    sole analyst who testified about the DNA evidence at
    trial neither performed nor observed the analysis of
    the buccal swab that produced the DNA profile and,
    therefore, was not a sufficient substitute witness to
    satisfy the defendant’s right to confrontation. We con-
    clude that, under the specific circumstances of this
    case, the defendant has established a violation of his
    right to confrontation. As a result, we reverse in part
    the judgment of the Appellate Court.
    The Appellate Court’s decision sets forth the follow-
    ing relevant facts, which the jury reasonably could have
    found. ‘‘On the night of October 28, 2012, Anthony
    Adams, the codefendant in this consolidated trial, tele-
    phoned Alexis Morrison to ask if she knew ‘somebody
    that could sell him some weed.’ Morrison called Neville
    Malacai Registe, the victim, to arrange for him to meet
    with Adams in the parking lot of her West Haven resi-
    dence. When the victim received Morrison’s telephone
    call, he was with his friend, Stephon Green, at his moth-
    er’s home in New Haven. After some time, the victim
    and Green left in the victim’s Acura. As they approached
    the designated parking lot, the victim called Morrison.
    Morrison then telephoned Adams to tell him that the
    victim ‘was there.’ Adams replied that he had already
    left because the victim ‘took too long . . . and that
    Day-Day and GZ [were] going to get the weed.’ ‘Day-
    Day’ and ‘GZ’ were nicknames for Daquane Adams, who
    is Anthony Adams’ cousin, and the defendant, respec-
    tively, both of whom Morrison knew.
    ‘‘When the victim and Green arrived in the parking
    lot, the victim backed his car into a parking space.
    Green, who was rolling a marijuana joint in the front
    passenger seat, looked up and noticed two men
    approaching the Acura. He returned his attention to his
    task, and the victim opened the driver’s door to talk to
    one of the men. [That] man, who was wearing a black
    bandana and who was later identified as the defendant,
    held a revolver inside the car and said, ‘run it,’ meaning,
    ‘give me it. It’s a robbery . . . .’ A physical altercation
    ensued. The second man, later identified as Daquane
    Adams, stepped away from the Acura and placed a cell
    phone call to someone. A Toyota arrived, and a third
    man exited that car and asked the defendant for the
    gun.1 The struggle over the gun continued inside the
    victim’s Acura, and someone knocked Green into the
    backseat. Daquane Adams and the third man pulled the
    defendant out of the [Acura] and, as Green was climbing
    back into the front passenger seat, a shot was fired.
    Green heard the victim say, ‘oh, shit,’ and then heard
    a second shot.
    ‘‘The defendant, Daquane Adams, and the third man
    got in the Toyota and drove toward the parking lot exit.
    With the victim slumped over in the driver’s seat, Green
    pursued the Toyota. He caught up to it at the end of
    the street and rammed the Acura into the back of the
    Toyota. The victim’s Acura was disabled, but the Toyota
    was able to be driven away. The victim died of a gunshot
    wound to his head.’’ (Footnote in original.) State v.
    Walker, 
    180 Conn. App. 291
    , 296–97, 
    183 A.3d 1
    (2018).
    The record reveals the following additional relevant
    facts and procedural history. In December, 2012, the
    defendant was arrested and charged with felony murder
    in violation of General Statutes (Rev. to 2013) § 53a-
    54c, conspiracy to commit robbery in the first degree
    in violation of General Statutes §§ 53a-48 (a) and 53a-
    134, and attempt to commit robbery in the first degree
    in violation of General Statutes §§ 53a-49 (a) (2) and
    53a-134 (a) (2). Anthony Adams and Daquane Adams
    also were arrested in December, 2012, and were subse-
    quently charged with various offenses.
    After the defendant’s arrest, the state continued its
    investigation into the respective roles played by the
    defendant, Anthony Adams, and Daquane Adams in the
    shooting. During their initial investigation, the police
    recovered from the Acura the black bandana that Green
    identified as having been worn by the man who shot
    the victim. The police sent the bandana to a laboratory
    run by the Division of Scientific Services of the Depart-
    ment of Emergency Services and Public Protection to
    be analyzed for DNA. In June, 2013, the state filed a
    motion in the present case requesting that the defendant
    submit to a buccal swab of his mouth2 ‘‘for purposes
    of obtaining a DNA sample.’’ The state argued that the
    DNA ‘‘will be of material aid in determining whether
    the defendant committed the crime of felony murder.’’
    The court granted the state’s motion, and Tammy Mur-
    ray, a detective in the West Haven Police Department,
    took the defendant’s buccal swab on June 19, 2013.
    Murray also took buccal swabs from Anthony Adams
    and Daquane Adams.3 Those three buccal swabs, as
    well as a sample of the victim’s blood, were then sent
    to the laboratory to be analyzed.
    At the laboratory, Heather Degnan, a supervisory
    forensic analyst, received the three buccal swabs and
    the victim’s blood sample and sent them to the ‘‘known
    processing group’’—a group within the laboratory that
    processes all known DNA samples to be used in compar-
    isons—to be analyzed. The known processing group
    generated a DNA profile from each sample and provided
    the profiles to Degnan. Degnan generated DNA profiles
    from the bandana, which she then compared with the
    known profiles that had been provided to her. As a
    result of that comparison, Degnan determined that the
    defendant was a major contributor to the DNA on the
    bandana. The victim, Anthony Adams, and Daquane
    Adams were eliminated as potential contributors. Deg-
    nan memorialized her findings in a ‘‘DNA Report’’ dated
    August 28, 2013 (report).
    After Degnan issued her report linking the defendant
    to the bandana believed to have been worn by the
    shooter, the state filed an amended substitute informa-
    tion charging the defendant with the additional crimes
    of manslaughter in the first degree with a firearm in
    violation of General Statutes §§ 53a-55 (a) (1) and 53a-
    55a (a), and criminal possession of a pistol or revolver
    in violation of General Statutes (Rev. to 2013) § 53a-
    217c (a) (1).
    The envelope containing the defendant’s buccal swab
    that Murray submitted to the laboratory was admitted
    into evidence. A review of that exhibit reveals that the
    envelope is labeled with the defendant’s name, his right
    thumbprint, and the words ‘‘DNA Buccal Swab Kit.’’
    The envelope lists ‘‘West Haven P.D.’’ as the submitting
    agency and displays a notation reading ‘‘Incident: Homi-
    cide.’’ The envelope identifies the defendant’s address
    as the MacDougall-Walker Correctional Institution.
    Following Murray’s testimony, the state called Deg-
    nan to testify. She began by explaining the standard
    DNA typing techniques used by the laboratory in gener-
    ating DNA profiles. She testified that the process
    involves four steps: (1) extracting DNA from the sample
    and purifying it of contaminants; (2) quantitating the
    DNA, i.e., determining the amount of DNA that has
    been extracted; (3) amplifying the DNA using a thermal
    cycler machine, i.e., creating many copies of different
    regions of the DNA; and (4) interpreting the data gener-
    ated from these steps and constructing the numerical
    DNA profile, which consists of a series of numbers to
    designate the ‘‘alleles.’’4
    Degnan further testified about her analysis and find-
    ings. Degnan testified that she personally analyzed the
    bandana using standard DNA typing techniques. She
    isolated DNA from both sides of the bandana and gener-
    ated DNA profiles of at least two contributors, a major
    contributor and a minor contributor. With respect to the
    buccal swabs and the victim’s blood sample, however,
    Degnan testified that she did not generate those DNA
    profiles herself. Degnan explained that the swabs and
    blood sample were sent to the known processing group,
    which generated DNA profiles from the samples and
    then ‘‘provided’’ those profiles to her for comparison
    with the DNA from the bandana.
    Before Degnan testified as to the results of her com-
    parison, defense counsel objected to the admission of
    this evidence on the ground that Degnan had not been
    qualified as an expert. During voir dire examinations
    conducted in the jury’s presence, Degnan admitted that
    she neither participated in the known processing
    group’s analysis of the defendant’s buccal swab nor
    observed the analysis being conducted.
    Nonetheless, when asked whether she was ‘‘swearing
    to the accuracy’’ of the DNA profile provided to her,
    Degnan responded by saying ‘‘[y]es.’’ Degnan further
    testified that, in addition to the profile itself, the known
    processing group provided her with ‘‘paperwork’’ indi-
    cating that ‘‘all of the checkboxes were check[ed]’’—
    that is, that the analyst or analysts who processed the
    known samples ‘‘did it properly, followed standard
    operating procedures.’’ Degnan confirmed, however,
    that she ‘‘wasn’t there’’ when the known processing
    group analyzed the defendant’s buccal swab.
    Ultimately, the trial court overruled the objection and
    permitted Degnan to testify to the results of her analysis.
    Degnan testified that, based on her analysis and DNA
    comparison, the defendant was a major contributor to
    the DNA found on both sides of the bandana. Degnan’s
    report was admitted into evidence.5 In the report, Deg-
    nan explained that the buccal swab was analyzed in
    accordance with standard laboratory procedures. The
    report also contains a table setting forth the numerical
    profiles generated from the defendant’s buccal swab,
    the bandana, and the victim’s blood sample. On the
    basis of a comparison of these profiles, Degnan con-
    cluded that the defendant ‘‘is included as a contributor
    to the DNA profiles’’ obtained from the bandana. The
    report was signed by Degnan and Dahong Sun, a ‘‘tech-
    nical reviewer’’ who reviewed Degnan’s work and con-
    firmed the accuracy of her conclusions. The final page
    of the report, just above Degnan’s and Sun’s signatures,
    provides: ‘‘This report reflects the test results, conclu-
    sions, interpretations, and/or the findings of the analyst
    as indicated by their signature below.’’6 No one from
    the known processing group testified at trial.
    The jury found the defendant guilty of felony murder,
    manslaughter in the first degree with a firearm, attempt
    to commit robbery in the first degree, and criminal
    possession of a pistol or revolver.7 State v. 
    Walker, supra
    , 
    180 Conn. App. 297
    . The court imposed a total
    effective sentence of forty-five years incarceration to
    be followed by ten years of special parole. 
    Id. The defendant
    then appealed to the Appellate Court,
    claiming, inter alia, that he was deprived of his sixth
    amendment right to confront witnesses against him
    because the trial court admitted the evidence of Deg-
    nan’s comparison without requiring an analyst from
    the known processing group who generated the known
    DNA profile used in that comparison to testify. 
    Id., 297–98. The
    Appellate Court first concluded that,
    despite the defendant’s failure to raise the confrontation
    clause as an objection at trial, the claim was reviewable
    under State v. Golding, 
    213 Conn. 233
    , 239–40, 
    567 A.2d 823
    (1989). State v. 
    Walker, supra
    , 
    180 Conn. App. 301
    –302.
    The Appellate Court further concluded, however, that
    the defendant’s claim failed under Golding because the
    admission of the DNA evidence did not violate his con-
    stitutional right to confrontation. 
    Id., 302. The
    Appellate
    Court reasoned principally that Degnan, the analyst
    who ‘‘conducted the critical analysis and made the
    resulting findings’’ that connected the defendant to the
    bandana from the crime scene, testified and was avail-
    able for cross-examination at trial regarding her analy-
    sis and findings. Id.8
    Upon our grant of certification to appeal, the defen-
    dant claims that the Appellate Court incorrectly con-
    cluded that the introduction of the evidence concerning
    his DNA profile did not violate his confrontation rights.9
    Because the defendant failed to raise a confrontation
    clause objection in the trial court, we review this claim
    pursuant to Golding. See, e.g., State v. Smith, 
    289 Conn. 598
    , 620–21, 
    960 A.2d 993
    (2008). Under Golding, ‘‘a
    defendant can prevail on a claim of constitutional error
    not preserved at trial only if all of the following condi-
    tions are met: (1) the record is adequate to review the
    alleged claim of error; (2) the claim is of constitutional
    magnitude alleging the violation of a fundamental right;
    (3) the alleged constitutional violation . . . exists and
    . . . deprived the defendant of a fair trial; and (4) if
    subject to harmless error analysis, the state has failed to
    demonstrate harmlessness of the alleged constitutional
    violation beyond a reasonable doubt.’’ (Emphasis in
    original; internal quotation marks omitted.) State v.
    Newton, 
    330 Conn. 344
    , 353, 
    194 A.3d 272
    (2018); see
    also In re Yasiel R., 
    317 Conn. 773
    , 781, 
    120 A.3d 1188
    (2015) (modifying third prong of Golding).
    The first two prongs of Golding are satisfied here.
    The record is adequate for review, and the defendant’s
    claim is of constitutional magnitude because it impli-
    cates his sixth amendment right to confrontation. Fur-
    thermore, the state does not attempt to meet its burden
    of establishing that the error was harmless beyond a
    reasonable doubt. Accordingly, the sole issue in this
    appeal concerns the third prong of Golding—namely,
    whether the defendant has established a violation of
    his sixth amendment confrontation rights.
    The defendant claims that his right to confrontation
    was violated because the DNA profile generated from
    his postarrest buccal swab and provided to Degnan for
    use in a comparison was testimonial hearsay, and the
    analyst who generated the profile was not made avail-
    able for cross-examination at trial. As support for this
    claim, the defendant contends that the evidence of his
    DNA profile was offered for its truth and was generated
    for the primary purpose of providing evidence against
    him in his criminal case. In response, the state contends
    that the evidence admitted concerning Degnan’s DNA
    comparison was neither hearsay nor testimonial in
    nature. Alternatively, the state contends that, even if the
    DNA profile were testimonial hearsay, the defendant’s
    right to confrontation was satisfied because he had the
    opportunity to cross-examine Degnan, who personally
    processed the bandana and made the comparison, and
    who was familiar with the laboratory’s standard proce-
    dures for conducting DNA analyses. We agree with the
    defendant that, under the circumstances of this case,
    the admission of the evidence concerning his DNA pro-
    file violated his sixth amendment right to confrontation.
    The sixth amendment to the United States constitu-
    tion, applicable to the states through the fourteenth
    amendment,10 provides in relevant part: ‘‘In all criminal
    prosecutions, the accused shall enjoy the right . . . to
    be confronted with the witnesses against him . . . .’’
    U.S. Const., amend. VI. ‘‘In Crawford v. Washington,
    [
    541 U.S. 36
    , 
    124 S. Ct. 1354
    , 
    158 L. Ed. 2d 177
    (2004)],
    the [United States] Supreme Court substantially revised
    its approach to confrontation clause claims. Under
    Crawford, testimonial hearsay is admissible against a
    criminal defendant at trial only if the defendant had a
    prior opportunity for cross-examination and the witness
    is unavailable to testify at trial. . . . In adopting this
    ‘categorical’ approach, the court overturned existing
    precedent that had applied an ‘open-ended balancing
    [test]’ . . . conditioning the admissibility of out-of-
    court statements on a court’s determination of whether
    the proffered statements bore ‘adequate indicia of relia-
    bility.’ . . . Although Crawford’s revision of the court’s
    confrontation clause jurisprudence is significant, its
    rules govern the admissibility only of certain classes
    of statements, namely, testimonial hearsay.’’ (Citations
    omitted.) State v. Buckland, 
    313 Conn. 205
    , 212–13, 
    96 A.3d 1163
    (2014), cert. denied,        U.S.     , 
    135 S. Ct. 992
    , 
    190 L. Ed. 2d 837
    (2015). Accordingly, the threshold
    inquiries in a confrontation clause analysis ‘‘are whether
    the statement was hearsay, and if so, whether the state-
    ment was testimonial in nature . . . .’’ State v. 
    Smith, supra
    , 
    289 Conn. 618
    –19. These are questions of law
    over which our review is plenary. 
    Id., 619. With
    these principles in mind, we address the three
    components of the defendant’s confrontation clause
    claim: (1) whether the evidence was hearsay, (2)
    whether the evidence was testimonial, and (3) whether
    the defendant’s cross-examination of Degnan was suffi-
    cient to satisfy the confrontation clause.
    I
    The defendant first contends that the evidence of his
    known DNA profile, which Degnan testified she utilized
    in making her comparison to the DNA on the bandana,
    was hearsay. The defendant notes that Degnan neither
    participated in nor observed the analysis of his buccal
    swab that yielded the profile but, instead, relied upon
    the profile provided to her by the known processing
    group in conducting her comparison. Therefore, the
    defendant maintains, Degnan’s testimony necessarily
    introduced the known processing group’s hearsay state-
    ments about the numerical profile.
    In response, the state concedes that the evidence of
    the defendant’s DNA profile was offered for its truth
    but nonetheless contends that the evidence was not
    hearsay because Degnan, an expert witness, testified
    in court to her own independent opinion that the DNA
    profile was accurate. In other words, the state contends
    that Degnan’s testimony did not introduce any out-of-
    court statements concerning the profile because Deg-
    nan adopted any such statements as her own and was
    cross-examined about them at trial. We agree with the
    defendant that the evidence of his DNA profile was
    hearsay.
    ‘‘Hearsay’’ is ‘‘a statement, other than one made by
    the declarant while testifying at the proceeding, offered
    in evidence to establish the truth of the matter
    asserted.’’ (Emphasis added.) Conn. Code Evid. § 8-1
    (3). The confrontation clause ‘‘does not bar admission
    of a statement so long as the declarant is present at
    trial to defend or explain it.’’ Crawford v. 
    Washington, supra
    , 
    541 U.S. 60
    n.9.
    Because the state concedes that the evidence of the
    numerical DNA profile generated from the defendant’s
    buccal swab was offered for its truth, the sole issue in
    our hearsay analysis is whether Degnan’s testimony
    introduced into evidence the known processing group’s
    out-of-court statements about the profile, as the defen-
    dant contends, or merely presented her own, indepen-
    dent opinion that the profile provided to her was
    accurate.
    As a general matter, we acknowledge that expert
    witnesses such as Degnan may base their testimony on
    information provided to them by other sources without
    their testimony necessarily being regarded as introduc-
    ing hearsay. Indeed, § 7-4 (b) of the Connecticut Code
    of Evidence provides in relevant part: ‘‘The facts in the
    particular case upon which an expert bases an opinion
    may be those perceived by or made known to the expert
    at or before the proceeding. The facts need not be
    admissible in evidence if of a type customarily relied
    on by experts in the particular field in forming opinions
    on the subject. . . .’’ The ‘‘[i]nadmissible facts upon
    which experts customarily rely in forming opinions can
    be derived from sources such as conversations, infor-
    mal opinions, written reports and data compilations.’’
    (Internal quotation marks omitted.) Milliun v. New Mil-
    ford Hospital, 
    310 Conn. 711
    , 726, 
    80 A.3d 887
    (2013),
    quoting Conn. Code Evid. (2009) § 7-4 (b), commentary.
    Accordingly, ‘‘[w]hen the expert witness has consulted
    numerous sources, and uses that information, together
    with his own professional knowledge and experience,
    to arrive at his opinion, that opinion is regarded as
    evidence in its own right and not as hearsay in dis-
    guise.’’ (Emphasis added; internal quotation marks
    omitted.) Milliun v. New Milford 
    Hospital, supra
    ,
    726–27.
    Nonetheless, the underlying information upon which
    the expert’s opinion is based may not itself be admitted
    into evidence for its truth. Indeed, § 7-4 (b) of the Con-
    necticut Code of Evidence further provides in relevant
    part: ‘‘The facts relied on [by the expert] pursuant to
    this subsection are not substantive evidence, unless
    otherwise admissible as such evidence.’’ This language
    ‘‘expressly forbids the facts upon which the expert
    based his or her opinion to be admitted for their truth
    unless otherwise substantively admissible under other
    provisions of the Code. Thus, [§ 7-4] (b) does not consti-
    tute an exception to the hearsay rule or any other exclu-
    sionary provision of the Code.’’ (Emphasis in original;
    internal quotation marks omitted.) Milliun v. New Mil-
    ford 
    Hospital, supra
    , 
    310 Conn. 726
    , quoting Conn. Code
    Evid. (2009) § 7-4 (b), commentary. Accordingly, the
    testimony of an expert witness improperly introduces
    hearsay when the out-of-court statements upon which
    it is based are themselves admitted into evidence to
    prove the truth of what they assert. See, e.g., 
    id., 728 (observing
    that physician’s report offered for substan-
    tive purposes would be barred if it ‘‘include[d] hearsay
    statements’’); Farrell v. Bass, 
    90 Conn. App. 804
    , 817–19,
    
    879 A.2d 516
    (2005) (concluding that trial court properly
    precluded expert witness from testifying about hearsay
    contents of article that supported his opinion where
    article itself was not admitted into evidence).
    In criminal cases, the admission of expert testimony
    that is based upon an out-of-court statement may impli-
    cate the confrontation clause if the underlying state-
    ment itself is testimonial. Acknowledging these con-
    cerns, courts have held that expert witnesses may base
    their opinions on the testimonial findings of other
    experts without violating the confrontation clause if
    those underlying findings are not themselves put before
    the jury. See Williams v. Illinois, 
    567 U.S. 50
    , 71, 
    132 S. Ct. 2221
    , 
    183 L. Ed. 2d 89
    (2012) (plurality opinion)
    (no confrontation clause violation where testifying
    expert ‘‘made no . . . reference to the [nontestifying
    analyst’s] report, which was not admitted into evidence
    and was not seen by the trier of fact,’’ and did not
    testify to ‘‘anything that was done at the [nontestifying
    expert’s] lab [or] vouch for the quality of [the] work’’);
    Bullcoming v. New Mexico, 
    564 U.S. 647
    , 673, 131 S.
    Ct. 2705, 
    180 L. Ed. 2d 610
    (2011) (Sotomayor, J., concur-
    ring in part) (concluding that admission of testimonial
    report violated confrontation clause but noting that
    ‘‘[w]e would face a different question if asked to deter-
    mine the constitutionality of allowing an expert witness
    to discuss others’ testimonial statements if the testimo-
    nial statements were not themselves admitted as evi-
    dence’’); United States v. Locascio, 
    6 F.3d 924
    , 937–38
    (2d Cir. 1993) (expert’s opinion that was based upon
    information gleaned from ‘‘countless nameless inform-
    ers and countless tapes not in evidence’’ did not violate
    hearsay bar or confrontation clause [emphasis added;
    internal quotation marks omitted]), cert. denied, 
    511 U.S. 1070
    , 
    114 S. Ct. 1645
    , 
    128 L. Ed. 2d 365
    (1994);
    State v. Griep, 
    361 Wis. 2d 657
    , 682–83, 
    863 N.W.2d 567
    (2015) (no confrontation clause violation where
    nontestifying analyst’s ‘‘testimonial statements do not
    come into evidence, i.e., where the testimonial forensic
    report is not admitted and the expert witness who testi-
    fies at trial gives his or her independent opinion after
    review of laboratory data’’), cert. denied,       U.S. ,
    
    136 S. Ct. 793
    , 
    193 L. Ed. 2d 709
    (2016); Paredes v.
    State, 
    439 S.W.3d 522
    , 526 (Tex. App. 2014) (‘‘a testifying
    expert may rely on unadmitted data generated by a
    [nontestifying] analyst . . . without violating the
    [c]onfrontation [c]lause’’), aff’d, 
    462 S.W.3d 510
    (Tex.),
    cert. denied,       U.S. , 
    136 S. Ct. 483
    , 
    193 L. Ed. 2d 354
    (2015).
    On the other hand, where the testifying expert explic-
    itly refers to, relies on, or vouches for the accuracy of
    the other expert’s findings, the testifying expert has
    introduced out-of-court statements that, if offered for
    their truth and are testimonial in nature, are subject to
    the confrontation clause. As the District of Columbia
    Court of Appeals explained in Young v. United States,
    
    63 A.3d 1033
    (D.C. 2013), a testifying expert ‘‘relayed
    hearsay’’ when she testified ‘‘that she matched a DNA
    profile derived from [the defendant’s] buccal swab with
    male DNA profiles derived from [the victim’s] vaginal
    swabs and her discarded tissue. Because [the testifying
    expert] was not personally involved in the process that
    generated the [DNA] profiles, she had no personal
    knowledge of how or from what sources the profiles
    were produced. She was relaying, for their truth, the
    substance of out-of-court assertions by absent lab tech-
    nicians that, employing certain procedures, they
    derived the profiles from the evidence furnished by
    [the victim] or [the defendant]. Those assertions were
    hearsay.’’ 
    Id., 1045; see
    also United States v. Pablo, 
    696 F.3d 1280
    , 1288 (10th Cir. 2012) (‘‘[i]f an expert simply
    parrots another individual’s out-of-court statement,
    rather than conveying an independent judgment that
    only incidentally discloses the statement to assist the
    jury in evaluating the expert’s opinion, then the expert
    is, in effect, disclosing that out-of-court statement for
    its substantive truth; the expert thereby becomes little
    more than a backdoor conduit for an otherwise inadmis-
    sible statement’’); United States v. Dukagjini, 
    326 F.3d 45
    , 59 (2d Cir. 2003) (expert’s opinion about interpreta-
    tion of coded language in recorded conversations vio-
    lated hearsay bar and confrontation clause because tes-
    timony explicitly referred to conversations between
    expert and informants as bases for expert’s opinion),
    cert. denied sub nom. Griffin v. United States, 
    541 U.S. 1092
    , 
    124 S. Ct. 2832
    , 
    159 L. Ed. 2d 259
    (2004);
    Commonwealth v. Barbosa, 
    457 Mass. 773
    , 783–86, 
    933 N.E.2d 93
    (2010) (confrontation rights were violated
    by analyst’s testimony that other analyst agreed with
    testifying analyst’s opinion regarding DNA testing, and
    by admission into evidence of table showing nontesti-
    fying analyst’s findings), cert. denied, 
    563 U.S. 990
    , 
    131 S. Ct. 2441
    , 
    179 L. Ed. 2d 1214
    (2011).
    Therefore, as courts consistently have recognized,
    expert witnesses cannot be used as conduits for the
    admission into evidence of the testimonial statements
    of others. This would permit testifying experts to simply
    relay the findings of other experts while immunizing
    those underlying findings from scrutiny on cross-exami-
    nation. The state cannot ‘‘rely on [the testifying wit-
    ness’] status as an expert to circumvent the [c]onfronta-
    tion [c]lause’s requirements.’’ Williams v. 
    Illinois, supra
    , 
    567 U.S. 126
    (Kagan, J., dissenting); see United
    States v. Johnson, 
    587 F.3d 625
    , 635 (4th Cir. 2009)
    (‘‘[a]llowing a witness simply to parrot out-of-court tes-
    timonial statements of cooperating witnesses and confi-
    dential informants directly to the jury in the guise of
    expert opinion would provide an end run around Craw-
    ford’’ [internal quotation marks omitted]); Common-
    wealth v. 
    Barbosa, supra
    , 
    457 Mass. 784
    (admission of
    second expert’s opinion through testifying expert would
    violate confrontation clause ‘‘because the opinion of
    the second expert would not be subject to cross-exami-
    nation’’); People v. John, 
    27 N.Y.3d 294
    , 309, 
    52 N.E.3d 1114
    , 
    33 N.Y.S.3d 88
    (2016) (‘‘[T]hese critical analysts
    who engaged in an independent and qualitative analysis
    of the data during the DNA typing tests—none of whom
    was claimed to be unavailable—were effectively insu-
    lated from cross-examination. [The testifying analyst],
    instead, was permitted to parrot the recorded findings
    that were derived from the critical witnesses’ subjective
    analyses.’’); see also United States v. Meises, 
    645 F.3d 5
    , 22 (1st Cir. 2011) (prosecutors ‘‘cannot be permitted
    to circumvent the [c]onfrontation [c]lause by introduc-
    ing the same substantive testimony in a different form’’
    [internal quotation marks omitted]).
    In the present case, Degnan testified at trial to her
    opinion that the defendant was a contributor to the
    DNA on the bandana recovered from the crime scene.
    She based this testimony on her comparison of the
    DNA profiles she derived from the bandana to the DNA
    profile generated by the known processing group from
    the defendant’s buccal swab. Degnan performed the
    analysis of the bandana and conducted the ultimate
    comparison herself. She was not, however, involved in
    the analysis of the buccal swab, which was an essential
    component of the comparison making her opinion pos-
    sible. There was no comparison without the buccal
    swab analysis. Rather, the known processing group con-
    ducted this analysis and provided the resulting DNA
    profile to Degnan for her to use in her comparison.
    Degnan neither participated in nor observed this analy-
    sis. There is also no evidence contained within the
    record indicating that the known processing group pro-
    vided Degnan with the raw machine data generated
    from the preliminary stages of the analysis such that
    Degnan could independently verify that the DNA profile
    had accurately been constructed.11 Despite having been
    uninvolved in the analysis, Degnan relied on that known
    profile in order to complete her analysis and testified
    that she was ‘‘swearing to the accuracy’’ of the DNA
    profile that the known processing group had provided
    to her.
    We agree with the defendant that Degnan’s testimony
    at trial necessarily introduced the out-of-court state-
    ments of the known processing group and did not con-
    sist merely of her own independent opinion. To be clear,
    Degnan’s testimony about the DNA profiles she gener-
    ated from the bandana was not hearsay because she
    conducted these analyses herself. Rather, Degnan
    explicitly referred to, relied on, and vouched for the
    quality of work that she did not perform and, in so
    doing, relayed to the jury the known processing group’s
    out-of-court statements about the defendant’s numeri-
    cal DNA profile. See People v. Austin, 
    30 N.Y.3d 98
    ,
    105, 
    86 N.E.3d 542
    , 
    64 N.Y.S.3d 650
    (2017) (‘‘Although
    the criminalist [who testified at trial] may have had
    some level of involvement in [the laboratory’s] handling
    of some of the . . . crime scene swabs, he had no role
    whatsoever in the testing of [the] defendant’s post-accu-
    satory buccal swab. His testimony was, therefore,
    merely a conduit for the conclusions of others . . . .’’
    [Citation omitted; internal quotation marks omitted.]).
    These assertions were hearsay.
    Moreover, Degnan introduced the known processing
    group’s out-of-court statements by including in her
    report, which was admitted into evidence without limi-
    tation, the allele numbers comprising the defendant’s
    DNA profile that the known processing group had pro-
    vided to her. See Commonwealth v. McCowen, 
    458 Mass. 461
    , 482–83, 
    939 N.E.2d 735
    (2010) (concluding
    that testifying analyst introduced hearsay by admitting
    chart into evidence that compared alleles from DNA
    taken from victim, which analyst generated herself, and
    alleles from defendant’s known sample, which were
    generated by another analyst). The report provides that
    the DNA was extracted from the defendant’s buccal
    swab and analyzed according to standard laboratory
    procedure. The report then states that ‘‘[t]he following
    results were obtained on the amplified items’’ and lists
    the alleles generated by the known processing group.
    The report further contains Degnan’s conclusion that,
    based on the comparison of the alleles from the buccal
    swab and the profiles she generated from the bandana,
    the defendant was a contributor to the DNA on the
    bandana. Finally, just above Degnan’s signature, the
    report contains the following language: ‘‘This report
    reflects the test results, conclusions, interpretations,
    and/or the findings of the analyst as indicated by their
    signature below,’’ with no disclaimer that Degnan was
    not involved in generating the known profile.
    We therefore do not agree with the state’s contention
    that Degnan’s testimony did not introduce any out-of-
    court statements. In order for Degnan to reach her
    conclusion that the defendant was a match to the DNA
    found on the bandana, she had to rely on and incorpo-
    rate the known processing group’s findings into her
    own. Moreover, the underlying findings of the known
    processing group upon which she relied were them-
    selves admitted into evidence in multiple forms.
    Because the state concedes that this evidence was
    offered for its truth—a concession we think unavoid-
    able—it is hearsay and, if testimonial in nature; see part
    II of this opinion; implicates the defendant’s confronta-
    tion rights. Concluding otherwise merely because Deg-
    nan is an expert witness would immunize from cross-
    examination the analyst or analysts of the known pro-
    cessing group who made the critical findings upon
    which Degnan’s comparison was based.
    Finally, we note that the Appellate Court concluded
    that the evidence of the defendant’s DNA profile was
    not offered for its truth but, rather, to explain the
    assumptions upon which Degnan based her opinion that
    the defendant’s DNA profile matched the DNA found
    on the bandana. State v. 
    Walker, supra
    , 
    180 Conn. App. 307
    . As support for this conclusion, the Appellate Court
    cited the plurality opinion in Williams v. 
    Illinois, supra
    ,
    
    567 U.S. 50
    , and, specifically, the plurality’s observation
    that ‘‘[o]ut-of-court statements that are related by the
    expert solely for the purpose of explaining the assump-
    tions on which that opinion rests are not offered for
    their truth and thus fall outside the scope of the [c]on-
    frontation [c]lause.’’ 
    Id., 58. We
    have recognized this
    evidentiary principle in other contexts. See State v.
    Copas, 
    252 Conn. 318
    , 328, 
    746 A.2d 761
    (2000)
    (‘‘[a]lthough some of the facts considered by the experts
    . . . may not [be] substantively admissible . . . the
    parties [are] not precluded from examining the experts
    about those facts insofar as they related to the basis
    for the experts’ opinions’’ [citations omitted]).
    As previously noted, however, on appeal to this court
    the state has conceded, and we agree, that the evidence
    of the defendant’s known DNA profile was offered for
    its truth. The present case therefore does not involve
    a situation in which the evidence was offered ‘‘solely’’
    for the purposes of explaining an expert’s assumptions,
    as the plurality believed to be the case in Williams. We
    note, moreover, that five justices in Williams rejected
    the plurality’s hearsay analysis and instead concluded
    that the evidence of the DNA profile used as part of a
    comparison was offered for its truth because it lacked
    any relevance to the case apart from its truth. See Wil-
    liams v. 
    Illinois, supra
    , 
    567 U.S. 106
    (Thomas, J., con-
    curring in judgment); 
    id., 126–27 (Kagan,
    J., dissenting);
    see also United States v. James, 
    712 F.3d 79
    , 95 (2d
    Cir. 2013) (‘‘[t]he Williams plurality’s first rationale—
    that the laboratory report there was offered as basis
    evidence, and not for its truth—was roundly rejected
    by five [j]ustices’’), cert. denied, 
    572 U.S. 1134
    , 134 S.
    Ct. 2660, 
    189 L. Ed. 2d 208
    (2014); Young v. United
    
    States, supra
    , 
    63 A.3d 1045
    (evidence of known DNA
    profiles necessarily were offered for their truth
    because, without nontestifying analysts’ assertions
    regarding accuracy of profiles, ‘‘what would have been
    left of [the testifying analyst’s] testimony—that she
    matched two DNA profiles she could not herself iden-
    tify—would have been meaningless’’). Because the evi-
    dence was offered for its truth, we need not address
    the question of whether such DNA evidence could, in
    other circumstances, be admitted for a nonhearsay
    purpose.
    II
    The defendant next contends that the evidence of his
    numerical DNA profile was testimonial because it was
    created for the primary purpose of establishing his guilt
    at trial. We agree with the defendant that, under the
    circumstances of this case, the known DNA profile
    was testimonial.
    We begin with the general principles governing our
    analysis. ‘‘[T]he confrontation clause applies only to
    statements that are testimonial in nature. . . . As a
    general matter, a testimonial statement is typically [a]
    solemn declaration or affirmation made for the purpose
    of establishing or proving some fact. . . . Although the
    United States Supreme Court did not provide a compre-
    hensive definition of what constitutes a testimonial
    statement in Crawford, the court did describe three
    core classes of testimonial statements: [1] ex parte in-
    court testimony or its functional equivalent—that is,
    material such as affidavits, custodial examinations,
    prior testimony that the defendant was unable to cross-
    examine, or similar pretrial statements that declarants
    would reasonably expect to be used prosecutorially
    . . . [2] extrajudicial statements . . . contained in for-
    malized testimonial materials, such as affidavits, depo-
    sitions, prior testimony, or confessions [and] . . . [3]
    statements that were made under circumstances which
    would lead an objective witness reasonably to believe
    that the statement would be available for use at a later
    trial . . . .’’ (Citations omitted; internal quotation
    marks omitted.) State v. 
    Smith, supra
    , 
    289 Conn. 622
    –
    23. The present case concerns only this third category
    form of testimonial statements.
    ‘‘[I]n Davis v. Washington, [
    547 U.S. 813
    , 822, 126 S.
    Ct. 2266, 
    165 L. Ed. 2d 224
    (2006)], the United States
    Supreme Court elaborated on the third category and
    applied a ‘primary purpose’ test to distinguish testimo-
    nial from nontestimonial statements given to police offi-
    cials, holding: ‘Statements are nontestimonial when
    made in the course of police interrogation under cir-
    cumstances objectively indicating that the primary pur-
    pose of the interrogation is to enable police assistance
    to meet an ongoing emergency. They are testimonial
    when the circumstances objectively indicate that there
    is no such ongoing emergency, and that the primary
    purpose of the interrogation is to establish or prove
    past events potentially relevant to later criminal prose-
    cution.’ . . .
    ‘‘In State v. Slater, [
    285 Conn. 162
    , 172 n.8, 
    939 A.2d 1105
    , cert. denied, 
    553 U.S. 1085
    , 
    128 S. Ct. 2885
    , 171 L.
    Ed. 2d 822 (2008)], we reconciled Crawford and Davis,
    noting: ‘We view the primary purpose gloss articulated
    in Davis as entirely consistent with Crawford’s focus
    on the reasonable expectation of the declarant. . . .
    [I]n focusing on the primary purpose of the communica-
    tion, Davis provides a practical way to resolve what
    Crawford had identified as the crucial issue in determin-
    ing whether out-of-court statements are testimonial,
    namely, whether the circumstances would lead an
    objective witness reasonably to believe that the state-
    ments would later be used in a prosecution.’ ’’ (Citations
    omitted.) State v. 
    Smith, supra
    , 
    289 Conn. 623
    –24.
    With these background principles in mind, our analy-
    sis of the testimonial nature of the DNA evidence at
    issue in the present case requires a review of the trilogy
    of United States Supreme Court cases applying these
    principles in the context of forensic evidence—Melen-
    dez-Diaz v. Massachusetts, 
    557 U.S. 305
    , 
    129 S. Ct. 2527
    ,
    
    174 L. Ed. 2d 314
    (2009), Bullcoming v. New 
    Mexico, supra
    , 
    564 U.S. 647
    , and Williams v. 
    Illinois, supra
    , 
    567 U.S. 50
    .
    In Melendez-Diaz, during the defendant’s trial on nar-
    cotics violations, the prosecution introduced into evi-
    dence three laboratory ‘‘ ‘certificates of analysis’ ’’ stat-
    ing that the substance seized from the defendant was
    cocaine. Melendez-Diaz v. 
    Massachusetts, supra
    , 
    557 U.S. 308
    . The United States Supreme Court held that the
    certificates were within the ‘‘core class of testimonial
    statements’’ because they were ‘‘made under circum-
    stances which would lead an objective witness reason-
    ably to believe that the statement would be available
    for use at a later trial.’’ (Internal quotation marks omit-
    ted.) 
    Id., 310. The
    court explained that the analysts’
    reports were ‘‘quite plainly’’ affidavits, that is, ‘‘declara-
    tion[s] of facts written down and sworn to by the declar-
    ant before an officer authorized to administer oaths,’’
    and were ‘‘functionally identical to live, in-court testi-
    mony.’’ (Internal quotation marks omitted.) 
    Id., 310–11. The
    court also noted that, under Massachusetts law,
    the ‘‘sole purpose’’ of the affidavits was to establish
    the composition, quality and weight of the substance
    believed to be cocaine and that it could be ‘‘safely
    assume[d]’’ that the analysts ‘‘were aware of the affida-
    vits’ evidentiary purpose, since that purpose . . . was
    reprinted on the affidavits themselves.’’ 
    Id., 311. In
    Bullcoming v. New 
    Mexico, supra
    , 
    564 U.S. 663
    ,
    the court held that the admission at trial of a lab report
    certifying that the defendant’s blood alcohol content
    exceeded the threshold for the offense of aggravated
    driving while intoxicated violated the confrontation
    clause. Emphasizing that ‘‘[a] document created solely
    for an ‘evidentiary purpose’ . . . made in aid of a police
    investigation, ranks as testimonial,’’ the court con-
    cluded that the report, although not sworn or notarized,
    closely resembled the reports at issue in Melendez-
    Diaz. 
    Id., 664. That
    is, law enforcement had provided
    seized evidence to a state laboratory for testing, an
    analyst tested the evidence and prepared a certificate
    concerning the results, and the certificate was formal-
    ized in a signed document entitled ‘‘ ‘report,’ ’’ which
    contained a reference to local rules concerning the
    admission of certified blood alcohol test results. 
    Id., 665. These
    circumstances, the court concluded, were
    ‘‘more than adequate’’ to qualify the analyst’s report as
    testimonial. 
    Id. Furthermore, the
    court held that the
    testimony of a surrogate witness, who was familiar with
    the device used in the test and the laboratory’s testing
    procedures but who did not conduct or observe this
    particular test, was insufficient to satisfy the confronta-
    tion clause. 
    Id., 661–62. Finally,
    in Williams v. 
    Illinois, supra
    , 
    567 U.S. 59
    ,
    an outside laboratory provided the police with a DNA
    profile generated from semen found on a vaginal swab
    of the victim of a rape. The police entered the profile
    into its DNA database and received notification of a
    cold hit with the defendant’s DNA profile, which had
    been entered into the database due to an unrelated
    arrest. 
    Id. The defendant
    was arrested and charged with
    the victim’s rape. 
    Id., 59–60. At
    trial, the prosecution
    called the analyst who prepared the defendant’s DNA
    profile in connection with the unrelated arrest, as well
    as the analyst who compared that profile to the DNA
    generated by the outside laboratory from the victim’s
    vaginal swab. 
    Id., 60–62. No
    one from the outside labora-
    tory who generated the profile from the vaginal swab,
    however, testified at trial. 
    Id., 62. Five
    justices agreed that the profile from the vaginal
    swabs relied upon by the analyst to make her compari-
    son was not testimonial but the fifth justice rejected
    the plurality’s ‘‘flawed analysis’’; 
    id., 104 (Thomas,
    J.,
    concurring in judgment); as did the four dissenting jus-
    tices. 
    Id., 135–38 (Kagan,
    J., dissenting). The plurality
    opinion, written by Justice Alito, concluded that the
    evidence was not testimonial because ‘‘the primary pur-
    pose of the [outside laboratory’s] report, viewed objec-
    tively, was not to accuse [the defendant] or to create
    evidence for use at trial. When the [police] sent the
    sample to [the outside laboratory], its primary purpose
    was to catch a dangerous rapist who was still at large,
    not to obtain evidence for use against [the defendant],
    who was neither in custody nor under suspicion at that
    time.’’ 
    Id., 84. The
    plurality reasoned that, because no
    one from the outside laboratory could have known the
    profile would inculpate the defendant—or anyone else
    whose DNA profile was in the police database—‘‘there
    was no prospect of fabrication and no incentive to pro-
    duce anything other than a scientifically sound and
    reliable profile.’’12 (Internal quotation marks omitted.)
    
    Id., 84–85. Justice
    Thomas authored a separate opinion concur-
    ring in the judgment reiterating his view that the con-
    frontation clause covers only ‘‘formalized testimonial
    materials, such as depositions, affidavits, and prior tes-
    timony, or statements resulting from formalized dia-
    logue, such as custodial interrogation.’’ (Internal quota-
    tion marks omitted.) 
    Id., 111. He
    reasoned that the
    primary purpose test, as articulated in Davis, was a
    necessary but insufficient criterion to render a state-
    ment testimonial because statements often serve more
    than one purpose. 
    Id., 114. He
    concluded that the report
    at issue was not sufficiently formal to be testimonial
    because it was not sworn or certified. 
    Id., 111. Justice
    Thomas and the four dissenting justices, however,
    rejected the plurality’s view that a statement must have
    the primary purpose of accusing a targeted individual
    of criminal conduct in order to be testimonial. 
    Id., 114. (Thomas,
    J., concurring in judgment); 
    id., 135 (Kagan,
    J., dissenting).
    Justice Kagan, writing for the four dissenting justices,
    concluded that the court’s prior decisions in Melendez-
    Diaz and Bullcoming compelled the conclusion that
    the DNA profile in the outside laboratory’s report was
    testimonial because it was ‘‘a statement [that] was made
    for the primary purpose of establishing past events
    potentially relevant to later criminal prosecution—in
    other words, for the purpose of providing evidence.’’
    (Internal quotation marks omitted.) 
    Id., 135. The
    dis-
    senting justices rejected Justice Thomas’ view that the
    statements were not testimonial because they were not
    sworn or certified, arguing that, similar to the reports
    deemed testimonial in the court’s prior cases, the report
    was ‘‘an official and signed record of laboratory test
    results, meant to establish a certain set of facts in legal
    proceedings.’’ 
    Id., 139 (Kagan,
    J., dissenting).
    Due to the fractured nature of the Williams decision,
    courts have struggled to determine the effect of Wil-
    liams, if any, on the legal principles governing confron-
    tation clause claims. See United States v. 
    James, supra
    ,
    
    712 F.3d 95
    –96 (applying previous case law because
    Williams yielded no single, useful holding); see also
    Williams v. 
    Illinois, supra
    , 
    567 U.S. 141
    (Kagan, J.,
    dissenting) (‘‘[t]he five [j]ustices who control the out-
    come of today’s case agree on very little’’ and ‘‘have left
    significant confusion in their wake’’). In ascertaining the
    effect of Williams, we note that, ‘‘[w]hen a fragmented
    Court decides a case and no single rationale explaining
    the result enjoys the assent of five [j]ustices, the holding
    of the [c]ourt may be viewed as that position taken by
    those [m]embers who concurred in the judgments on
    the narrowest grounds.’’ (Internal quotation marks
    omitted.) Marks v. United States, 
    430 U.S. 188
    , 193, 
    97 S. Ct. 990
    , 
    51 L. Ed. 2d 260
    (1977). As we recently
    observed, the court in Williams ‘‘made it impossible to
    identify the narrowest ground because the analyses of
    the various opinions are irreconcilable.’’ State v. Sin-
    clair, 
    332 Conn. 204
    , 225,        A.3d       (2019). Conse-
    quently, we explained in Sinclair that ‘‘we must rely
    on Supreme Court precedent before Williams to the
    effect that a statement triggers the protections of the
    [c]onfrontation [c]lause when it is made with the pri-
    mary purpose of creating a record for use at a later
    criminal trial.’’ (Internal quotation marks omitted.)
    State v. 
    Sinclair, supra
    , 225, quoting United States v.
    
    James, supra
    , 
    712 F.3d 95
    –96; see also United States
    v. Duron-Caldera, 
    737 F.3d 988
    , 994 and n.4 (5th Cir.
    2013).
    The issue in the present case does not concern the
    testimonial nature of Degnan’s report or DNA compari-
    son. Degnan made the comparison herself and was
    cross-examined about it at trial. Instead, we must deter-
    mine whether the defendant’s known DNA profile,
    which was obtained from a postarrest buccal swab and
    provided to Degnan for her to use in making a compari-
    son to DNA found on crime scene evidence, ranks as tes-
    timonial.
    As to this specific question, we find persuasive a
    series of decisions from the New York Court of Appeals.
    In People v. 
    John, supra
    , 
    27 N.Y.3d 297
    –98, the defendant
    was charged with illegal possession of a firearm arising
    from an incident in which he allegedly pointed a gun
    at another individual. The police swabbed the firearm
    found in the basement of the defendant’s apartment
    building and submitted the swabs to the crime labora-
    tory to be analyzed for DNA. Along with the swabs, the
    police sent an evidence request listing the defendant
    as the arrestee and providing, as the reason for the
    request, ‘‘ ‘PERP HANDLED THE FIREARM.’ ’’ 
    Id., 298. Following
    his indictment, the defendant submitted to
    a court-ordered buccal swab. 
    Id., 299. The
    laboratory
    generated a report listing the numerical DNA profiles
    from the firearm and the buccal swab in a comparison
    table, showing an identical match. 
    Id. The New
    York Court of Appeals concluded: ‘‘[T]he
    laboratory reports as to the DNA profile generated from
    the evidence submitted to the laboratory by the police
    in a pending criminal case were testimonial. The DNA
    profiles were generated in aid of a police investigation
    of a particular defendant charged by an accusatory
    instrument and created for the purpose of substantively
    proving the guilt of a defendant in his pending criminal
    action.’’ 
    Id., 308. In
    addition, the court observed that
    ‘‘the primary purpose of the laboratory examination on
    the gun swabs could not have been lost on the . . .
    analysts’’ in light of the accompanying evidence request
    indicating that the basis for the request was that the
    firearm had been handled by the defendant. 
    Id. The New
    York Court of Appeals’ subsequent decision
    in People v. 
    Austin, supra
    , 
    30 N.Y.3d 98
    , is squarely
    analogous to the present case. In that case, the crime
    laboratory generated DNA profiles from blood recov-
    ered from the scene of multiple burglaries. 
    Id., 100. The
    police uploaded one of the profiles into their database
    and returned a ‘‘match’’ for the defendant. 
    Id., 100–101. The
    defendant was subsequently charged with the bur-
    glaries. 
    Id., 101. At
    trial, the prosecutor opted not to
    call as a witness the analyst who prepared the profile
    from the database. Instead, the prosecutor had the
    defendant submit to a buccal swab, which yielded a
    DNA profile determined to match the DNA from the
    crime scene evidence. 
    Id. At trial,
    the prosecution’s sole
    forensic witness was a criminalist who testified that he
    reviewed the DNA profiles prepared by the analysts
    and determined that they matched. 
    Id. The analysts
    who
    generated the DNA profiles from the buccal swab and
    the crime scene evidence did not testify. 
    Id. The New
    York Court of Appeals held that the admis-
    sion of the criminalist’s testimony concerning the DNA
    profile generated from the defendant’s postarrest buc-
    cal swab ‘‘easily satisfies the primary purpose test.’’ 
    Id., 104. The
    court reasoned that, in establishing that the
    defendant’s DNA matched the DNA from the crime
    scene, the prosecution relied ‘‘solely on the evidence
    of the DNA profile generated from [the] buccal swab,
    which was developed during the course of a pending
    criminal action and was created in order to prove [the
    defendant’s] guilt at trial. . . .’’ (Citation omitted.) 
    Id. Therefore, the
    court explained, ‘‘the buccal swab was
    obtained and the resulting profile was compared with
    the DNA profile generated from the . . . burglaries,
    with the primary (truly, the sole) purpose of proving
    a particular fact in a criminal proceeding—that [the]
    defendant . . . committed the crime [with] which he
    was charged . . . .’’ (Citation omitted; internal quota-
    tion marks omitted.) 
    Id. We also
    find instructive the decision of the Supreme
    Judicial Court of Massachusetts in Commonwealth v.
    
    McCowen, supra
    , 
    458 Mass. 461
    , which involves facts
    nearly identical to those of the present case. In McCo-
    wen, the defendant, who was a suspect in a rape and
    murder investigation, submitted to a buccal swab,
    which yielded a DNA profile that the police later deter-
    mined matched the DNA derived from swabs taken
    from the victim. 
    Id., 465. At
    trial, the sole analyst called
    to testify had developed the DNA profiles from the
    samples taken from the victim and conducted the com-
    parative analysis but had not been involved in the gener-
    ation of the profile from the defendant’s buccal swab.
    
    Id., 482–83. The
    analyst testified to her opinion that the
    defendant was a contributor to the DNA found on the
    victim, and illustrated her analysis with a chart that
    made a side-by-side comparison of the allele numbers
    generated from the victim and those from the defen-
    dant’s buccal swab. 
    Id., 483. The
    Supreme Judicial Court concluded that ‘‘the
    allele numbers derived from the testing of the known
    samples by another analyst that were included in [the
    testifying analyst’s] chart were testimonial hearsay,
    because these were factual findings made by a nontesti-
    fying witness for the purpose of investigating the mur-
    der.’’ 
    Id., 483; see
    also Young v. United 
    States, supra
    ,
    
    63 A.3d 1047
    –48 (The court held that a DNA profile
    generated from the defendant’s buccal swab, which was
    taken after the defendant was identified as a suspect,
    was ‘‘generated for the primary purpose of establishing
    or proving a past fact relevant to later criminal prosecu-
    tion, namely the identity of [the victim’s] assailant.
    Under the basic ‘evidentiary purpose’ test, that is
    enough to render the test results testimonial.’’).13
    In light of the foregoing case law, we conclude that
    the DNA profile was generated from the defendant’s
    buccal swab for ‘‘the primary purpose of creating a
    record for use at a later criminal trial.’’ (Internal quota-
    tion marks omitted.) State v. 
    Sinclair, supra
    , 
    332 Conn. 225
    . The police took the buccal swab after the defendant
    was arrested and charged with various crimes in con-
    nection with his participation in the murder. The state
    obtained court authorization to conduct the buccal
    swab by filing a motion in the defendant’s criminal case
    representing that the buccal swab and resulting DNA
    profile ‘‘will be of material aid in determining whether
    the defendant committed the crime of felony murder.’’
    The purpose of obtaining the defendant’s known DNA
    profile was to compare it with DNA from the bandana
    found at the crime scene, which Green indicated had
    been worn by the person who shot and killed the victim.
    The defendant’s DNA profile was, therefore, generated
    in aid of an ongoing police investigation for the pri-
    mary—indeed, the sole—purpose of proving a fact in
    his criminal trial, namely, that his DNA was found on
    the bandana worn by the shooter. Indeed, after Degnan
    received the defendant’s DNA profile from the known
    processing group and determined that it matched the
    DNA from the bandana, thereby implicating the defen-
    dant as the shooter, the state charged the defendant
    with the additional crimes of manslaughter in the first
    degree with a firearm and criminal possession of a pistol
    or revolver.
    We further conclude that the analyst or analysts of
    the known processing group who processed the defen-
    dant’s buccal swab reasonably could have expected
    that the resulting DNA profile would later be used for
    prosecutorial purposes. See Ohio v. Clark,          U.S.
    , 
    135 S. Ct. 2173
    , 2181–82, 
    192 L. Ed. 2d 306
    (2015)
    (analyzing primary purpose of individuals who elicited
    statements, as well as primary purpose of declarant,
    in determining whether statements were testimonial);
    State v. 
    Slater, supra
    , 
    285 Conn. 172
    (analysis of testi-
    monial nature of statement ‘‘focuse[s] on the reason-
    able expectation of the declarant that, under the cir-
    cumstances, his or her words later could be used for
    prosecutorial purposes’’). The known processing group
    is a component of the Division of Scientific Services,
    which is required by statute to assist law enforcement
    in ongoing investigations. General Statutes § 29-7b; see
    also Bullcoming v. New 
    Mexico, supra
    , 
    564 U.S. 665
    (relying on laboratory’s legal obligation to assist law
    enforcement in concluding that its report was testi-
    monial). More directly, the envelope containing the buc-
    cal swab that Murray submitted to the laboratory was
    labeled with the defendant’s name and fingerprint;
    listed ‘‘West Haven P.D.’’ as the submitting agency,
    listed the MacDougall Walker Correctional Institution
    as the defendant’s address, and displayed a notation
    reading ‘‘Incident: Homicide.’’ The investigatory and,
    thus, evidentiary purpose of the buccal swab analysis
    would therefore have been readily apparent to the ana-
    lyst who conducted it.
    Additionally, Degnan testified that the known pro-
    cessing group generates DNA profiles for all known
    samples submitted to the laboratory and then provides
    those profiles to other analysts who then make the
    comparisons. In light of this standard practice, it is safe
    to assume that the analyst who processed the defen-
    dant’s buccal swab was aware of the likelihood that
    the resulting DNA profile would be used as part of a
    comparison with other evidence and, therefore, poten-
    tially utilized in a criminal proceeding. Put simply, the
    police sought the DNA profile as part of an ongoing
    criminal investigation, and we do not believe that that
    fact would have been lost on the known processing
    group.
    Finally, a word about formality. We observed in State
    v. 
    Sinclair, supra
    , 
    332 Conn. 225
    , that ‘‘[t]he one thread
    of Williams that is consistent with . . . earlier prece-
    dent is that . . . the formality attendant to the making
    of the statement must be considered.’’ In the present
    case, the precise level of formality surrounding the
    known processing group’s submission of the profile to
    Degnan is not entirely clear from the record. Under the
    circumstances, however, we do not believe that this
    consideration compels a different result. We note that
    the formality attending a particular statement, although
    relevant in the primary purpose analysis, is not disposi-
    tive. See Bullcoming v. New 
    Mexico, supra
    , 
    564 U.S. 671
    (Sotomayor, J., concurring in part) (‘‘[a]lthough
    [f]ormality is not the sole touchstone of our primary
    purpose inquiry, a statement’s formality or informality
    can shed light on whether a particular statement has a
    primary purpose of use at trial’’ [internal quotation
    marks omitted]); Michigan v. Bryant, 
    562 U.S. 344
    , 366,
    
    131 S. Ct. 1143
    , 
    179 L. Ed. 2d 93
    (2011) (‘‘although
    formality suggests the absence of an emergency and
    therefore an increased likelihood that the purpose of
    the interrogation is to establish or prove past events
    potentially relevant to later criminal prosecution . . .
    informality does not necessarily indicate the presence
    of an emergency or the lack of testimonial intent’’ [cita-
    tion omitted; internal quotation marks omitted]).
    Indeed, strict adherence to formality requirements
    may be especially problematic in the context of scien-
    tific evidence, as this requirement ‘‘can be easily sub-
    verted by . . . simple omission in the format of the
    documents, with a design to facilitate their use as evi-
    dence in a criminal trial.’’ People v. 
    John, supra
    , 
    27 N.Y.3d 312
    ; see also Davis v. 
    Washington, supra
    , 
    547 U.S. 826
    (confrontation clause cannot ‘‘readily be
    evaded’’ by parties’ keeping written product of interro-
    gation informal ‘‘instead of having the declarant sign a
    deposition’’). At any rate, the buccal swab and DNA
    profile were obtained pursuant to a postarrest court
    order. The known processing group provided the DNA
    profile to Degnan along with ‘‘paperwork’’ indicating
    that the sample was analyzed according to accepted
    laboratory procedures. These facts are suggestive of a
    certain level of formality that, together with the circum-
    stances set forth previously in this opinion, are suffi-
    cient to render the statement testimonial.
    The state, relying on the plurality opinion in Williams,
    contends that the defendant’s known DNA profile was
    not testimonial because it did not directly accuse the
    defendant of any criminal conduct but became accusa-
    tory only when compared with the DNA found on the
    bandana. In Williams, the plurality concluded that the
    DNA profile generated from vaginal swabs of the victim
    was not to accuse the defendant or create evidence at
    trial because ‘‘no one at [the laboratory] could have
    possibly known that the profile that it produced would
    turn out to inculpate [the defendant]—or for that mat-
    ter, anyone else whose DNA profile was in a law
    enforcement database.’’ Williams v. 
    Illinois, supra
    , 
    567 U.S. 84
    –85.
    We disagree. This line of reasoning was foreclosed
    by Melendez-Diaz, which, as previously explained,
    remains controlling in the present case due to the lack of
    any definitive holding in Williams. See State v. 
    Sinclair, supra
    , 
    332 Conn. 225
    . In Melendez-Diaz, the state
    asserted that the certificates of analysis stating that the
    seized substances were narcotics were not subject to
    confrontation because the analysts who prepared them
    were not ‘‘ ‘accusatory’ ’’ witnesses. Melendez-Diaz v.
    
    Massachusetts, supra
    , 
    557 U.S. 313
    . The state argued
    that the certificates did not ‘‘directly accuse [the defen-
    dant] of wrongdoing’’ but were ‘‘inculpatory only when
    taken together with other evidence . . . .’’ 
    Id. The United
    States Supreme Court rejected this argument,
    reasoning that the analysts ‘‘certainly provided testi-
    mony against [the defendant], proving one fact neces-
    sary for his conviction—that the substance he pos-
    sessed was cocaine.’’ (Emphasis in original.) 
    Id. The court
    explained that the text of the confrontation clause
    ‘‘contemplates two classes of witnesses—those against
    the defendant and those in his favor. The prosecution
    must produce the former; the defendant may call the
    latter. [T]here is not a third category of witnesses, help-
    ful to the prosecution, but somehow immune from con-
    frontation.’’ (Emphasis in original; footnote omitted.)
    
    Id., 313–14. Indeed,
    citing this portion of Melendez-Diaz, five jus-
    tices in Williams rejected the plurality’s rationale and
    concluded that DNA analyses may be testimonial
    regardless of whether they are inherently inculpatory.
    Williams v. 
    Illinois, supra
    , 
    567 U.S. 116
    (Thomas, J.,
    concurring); 
    id., 135–36 and
    n.5 (Kagan, J., dissenting);
    see also Washington v. Griffin, 
    876 F.3d 395
    , 407 n.10
    (2d Cir. 2017) (‘‘[The lower court] erred insofar as it
    held that DNA profiles, as a categorical matter, are
    [nontestimonial] because standing alone, [they] shed
    no light on the issue of the defendant’s guilt. As pre-
    viously noted . . . five [j]ustices in Williams . . .
    agreed that the introduction of DNA profiles could,
    under proper circumstances, run afoul of the [c]onfron-
    tation [c]lause.’’ [Citation omitted; internal quotation
    marks omitted.]), cert. denied,       U.S.    , 
    138 S. Ct. 2578
    , 
    201 L. Ed. 2d 299
    (2018); United States v. Duron-
    
    Caldera, supra
    , 
    737 F.3d 994
    –95 (declining to adopt
    inherently inculpatory rationale because it was rejected
    by five justices as well as Melendez-Diaz). Accordingly,
    statements are not rendered nontestimonial merely
    because the content of the statements does not directly
    accuse the defendant of criminal wrongdoing.
    The state further contends, again relying on the plu-
    rality opinion in Williams, that the DNA profile is not
    testimonial because ‘‘numerous technicians’’ worked
    on the defendant’s known DNA profile and that, ‘‘[w]hen
    the work of a lab is divided up in such a way, it is likely
    that the sole purpose of each technician is simply to
    perform his or her task in accordance with accepted
    procedures.’’ Williams v. 
    Illinois, supra
    , 
    567 U.S. 85
    .
    The plurality opinion in Williams observed that, under
    such circumstances, there is no ‘‘prospect of fabrication
    and no incentive to produce anything other than a scien-
    tifically sound and reliable profile.’’ (Internal quotation
    marks omitted.) 
    Id., 85. We
    are not persuaded. As a factual matter, nothing
    in the record indicates whether multiple analysts from
    the known processing group analyzed the buccal swab,
    as opposed to a single analyst. This aspect of Williams
    is, therefore, not implicated in the present case. More-
    over, as a matter of law, not only are we not bound by
    the result in Williams; see State v. 
    Sinclair, supra
    , 
    332 Conn. 225
    ; we disagree with the underlying proposition
    that the right to confrontation categorically does not
    apply to forensic evidence whenever there is no incen-
    tive to fabricate or falsify evidence.
    To be sure, ‘‘[c]onfrontation is designed to weed out
    not only the fraudulent analyst, but the incompetent
    one as well.’’ Melendez-Diaz v. 
    Massachusetts, supra
    ,
    
    557 U.S. 319
    . ‘‘[C]onfrontation protects against a wide
    range of witness reliability concerns beyond personal
    bias, such as perception, memory, narration, and sincer-
    ity.’’ United States v. Duron-
    Caldera, supra
    , 
    737 F.3d 996
    ; see Melendez-Diaz v. 
    Massachusetts, supra
    , 320
    (‘‘an analyst’s lack of proper training or deficiency in
    judgment may be disclosed in cross-examination’’); see
    also Williams v. 
    Illinois, supra
    , 
    567 U.S. 135
    –36 (Kagan,
    J., dissenting) (‘‘[S]urely the typical problem with labo-
    ratory analyses—and the typical focus of cross-exami-
    nation—has to do with careless or incompetent work,
    rather than with personal vendettas. And as to that
    predominant concern, it makes not a whit of difference
    whether, at the time of the laboratory test, the police
    already have a suspect.’’). The absence of an incentive
    to fabricate does not foreclose the potential for honest
    mistakes, which is independently sufficient to trigger
    the right to confrontation.
    Accordingly, we conclude that the evidence of the
    DNA profile generated by the known processing group
    from the defendant’s postarrest buccal swab was testi-
    monial hearsay.
    III
    Finally, the state contends that the defendant’s right
    to confrontation was satisfied in this case because Deg-
    nan, the laboratory supervisor who was familiar with
    the standard DNA testing procedures, testified and was
    subject to cross-examination. We disagree.
    The state’s argument that Degnan was a sufficient
    substitute witness is incompatible with Bullcoming v.
    New 
    Mexico, supra
    , 
    564 U.S. 647
    . In that case, the ana-
    lyst who conducted the defendant’s blood test and pre-
    pared the lab report certifying to his blood alcohol
    content did not testify at trial. Instead, the prosecution
    called a different analyst who did not conduct or
    observe the test but ‘‘ ‘qualified as an expert witness’ ’’
    with respect to the device used in the test and the
    laboratory’s testing procedures. 
    Id., 661. Concluding
    that such surrogate testimony was insufficient to satisfy
    the confrontation clause, the court reasoned that,
    despite the analyst’s qualifications, ‘‘surrogate testi-
    mony of the kind [the analyst] was equipped to give
    could not convey what [the nontestifying analyst] knew
    or observed about the events his certification con-
    cerned, i.e., the particular test and testing process he
    employed. Nor could such surrogate testimony expose
    any lapses or lies on the certifying analyst’s part.’’ (Foot-
    note omitted.) 
    Id., 661–62. The
    court emphasized that
    the confrontation clause ‘‘does not tolerate dispensing
    with confrontation simply because the court believes
    that questioning one witness about another’s testimo-
    nial statements provides a fair enough opportunity for
    cross-examination.’’ 
    Id., 662. Degnan,
    although familiar with the devices used to
    process DNA and the laboratory’s standard testing pro-
    cedures, did not conduct the analysis of the defendant’s
    buccal swab or observe the analysis being conducted.
    Accordingly, although defense counsel cross-examined
    Degnan about the methods she used when analyzing
    the bandana and comparing the profiles, he could not
    cross-examine her about the analysis of the buccal swab
    or the methods employed by the known processing
    group in generating that profile. See People v. 
    Austin, supra
    , 
    30 N.Y.3d 104
    –105 (‘‘in order to satisfy the [c]on-
    frontation [c]lause, [the] defendant was entitled to
    cross-examine the analyst who either performed, wit-
    nessed or supervised the generation of the critical
    numerical DNA profile or who used his or her indepen-
    dent analysis on the raw data to arrive at his or her
    own conclusions’’); see also Young v. United 
    States, supra
    , 
    63 A.3d 1048
    (‘‘without evidence that [the testi-
    fying analyst] performed or observed the generation of
    the DNA profiles . . . herself, her supervisory role and
    independent evaluation of her subordinates’ work prod-
    uct are not enough to satisfy the [c]onfrontation [c]lause
    because they do not alter the fact that she relayed
    testimonial hearsay’’); D. Kaye et al., The New Wigmore:
    A Treatise on Evidence (Cum. Supp. 2014) § 4.12.4, p.
    50 (‘‘Permitting a supervisor [to testify] is a superficially
    attractive approach, but it is not supported by careful
    scrutiny unless . . . the supervisor observed the ana-
    lyst conducting the test. If not, the supervisor has no
    greater connection to this specific test than does any
    other qualified laboratory employee.’’ [Emphasis in orig-
    inal.]).
    The state relies on a line of cases from other jurisdic-
    tions generally holding that the confrontation clause
    can be satisfied through the testimony of a supervisory
    analyst who reviewed the data prepared by the nontesti-
    fying analyst and formed his or her own opinion con-
    cerning that analyst’s conclusions. See, e.g., Common-
    wealth v. Yohe, 
    621 Pa. 527
    , 561, 
    79 A.3d 520
    (2013)
    (testifying expert’s analysis ‘‘did not simply parrot
    another analyst . . . rather, he was involved with
    reviewing all of the raw testing data, evaluating the
    results, measuring them against lab protocols to deter-
    mine if the results supported each other, and writing
    and signing the report’’ [citation omitted]), cert. denied,
    
    572 U.S. 1135
    , 
    134 S. Ct. 2662
    , 
    189 L. Ed. 2d 209
    (2014);
    State v. Michaels, 
    219 N.J. 1
    , 6, 
    95 A.3d 648
    (confronta-
    tion clause was satisfied by testimony of supervisory
    analyst who had ‘‘reviewed the [machine generated]
    data from the testing, had determined that the results
    demonstrated that [the] defendant had certain drugs
    present in her system, and had certified the results in
    a report’’),     U.S.      , 
    135 S. Ct. 761
    , 
    190 L. Ed. 2d 635
    (2014); State v. 
    Griep, supra
    , 
    361 Wis. 2d 683
    (‘‘when
    a [nontestifying] analyst documents the original tests
    with sufficient detail for another expert to understand,
    interpret, and evaluate the results, that expert’s testi-
    mony does not violate the [c]onfrontation [c]lause’’
    [internal quotation marks omitted]).
    In the present case, the record provides no basis for
    the claim that Degnan was provided with the raw data
    prepared by the known processing group and came to
    her own conclusion concerning the defendant’s DNA
    profile. Degnan did testify that the known processing
    group provided ‘‘paperwork’’ to her so that she ‘‘could
    see that all of the checkboxes were check[ed], that they
    did it properly, followed standard operating proce-
    dures.’’ This testimony merely establishes, however,
    that the known processing group represented to Degnan
    that they followed proper procedures during testing.
    As to the numerical profile produced from that testing,
    there is no evidence Degnan did anything at trial other
    than simply relay to the jury the profile that had been
    provided to her. Degnan was, therefore, not a sufficient
    substitute witness to satisfy the defendant’s right to con-
    frontation.
    We observe that this opinion does not conclude that
    all analysts who participate in the process of generating
    a DNA profile necessarily must testify. We simply con-
    clude that, where the generation of a DNA profile is
    testimonial, ‘‘at least one analyst with the requisite per-
    sonal knowledge must testify.’’ People v. 
    John, supra
    ,
    
    27 N.Y.3d 313
    . In this regard, we agree with the New
    York Court of Appeals that ‘‘the analysts involved in the
    preliminary testing stages, specifically, the extraction,
    quantitation or amplification stages,’’ are not necessary
    witnesses. 
    Id. Rather, ‘‘it
    is the generated numerical
    identifiers and the calling of the alleles at the final
    stage of the DNA typing that effectively accuses [the]
    defendant of his role in the crime charged.’’ 
    Id. Accord- ingly,
    to satisfy the confrontation clause, the state need
    only call as a witness an analyst with personal knowl-
    edge concerning the accuracy of the numerical DNA
    profile generated from the preliminary stages of testing.
    Because the state did not do so in the present case,
    we conclude that the defendant has established a viola-
    tion of his sixth amendment right to confront the wit-
    nesses against him. As the state has not asserted that
    this error is harmless beyond a reasonable doubt, the
    defendant is entitled to a new trial under Golding.
    The judgment of the Appellate Court is reversed inso-
    far as that court upheld the defendant’s conviction as
    to the charges of felony murder, attempt to commit
    robbery in the first degree, and criminal possession of
    a pistol or revolver, and the case is remanded to that
    court with direction to reverse the trial court’s judgment
    with respect to those charges and to remand the case
    to the trial court for a new trial.
    In this opinion the other justices concurred.
    1
    ‘‘The Toyota was [determined] to belong to Ronja Daniels, Daquane
    Adams’ girlfriend. Daniels testified that earlier that night, Daquane Adams
    had dropped her off at work and borrowed her car.’’ State v. Walker, 
    180 Conn. App. 291
    , 296 n.1, 
    183 A.3d 1
    (2018).
    2
    A buccal swab involves rubbing a Q-tip like instrument along the inside
    of the cheek to collect epithelial cells.
    3
    At trial, Murray testified that she followed the standard procedures when
    taking the buccal swabs from the defendant, Daquane Adams, and
    Anthony Adams.
    4
    ‘‘An allele is defined as one or two or more alternative forms of a gene.’’
    (Internal quotation marks omitted.) State v. Pappas, 
    256 Conn. 854
    , 880 n.7,
    
    776 A.2d 1091
    (2001).
    5
    References to Anthony Adams and Daquane Adams were redacted from
    the report.
    6
    Degnan also entered the numerical DNA profile of the major contributor
    to the DNA found on the bandana into the Connecticut and national DNA
    databases, which returned a ‘‘hit’’ on the defendant because the defendant’s
    DNA had previously been entered into the database as a result of a prior
    felony conviction. Evidence of this match, however, was not offered into
    evidence at trial.
    7
    The defendant was acquitted of the charge of conspiracy to commit
    robbery.
    8
    The Appellate Court also concluded that ‘‘the defendant’s conviction of
    felony murder and manslaughter violate[d] his constitutional protections
    against double jeopardy’’ and remanded the case with direction to vacate
    the defendant’s conviction with respect to the latter. State v. 
    Walker, supra
    ,
    
    180 Conn. App. 330
    –31. This aspect of the Appellate Court’s decision, how-
    ever, is not at issue in the present appeal.
    9
    Specifically, we granted the defendant’s petition for certification to
    appeal, limited to the following issue: ‘‘Did the Appellate Court properly
    determine that the defendant’s sixth amendment right to confrontation was
    not violated by testimony from a lab analyst regarding a known DNA profile
    generated from a swab processed by another analyst who did not testify at
    trial?’’ State v. Walker, 
    328 Conn. 934
    , 
    183 A.3d 634
    (2018).
    10
    Pointer v. Texas, 
    380 U.S. 400
    , 403, 
    85 S. Ct. 1065
    , 
    13 L. Ed. 2d 923
    (1965).
    11
    Although Degnan testified that the known processing group provided
    her with ‘‘paperwork’’ indicating that the group had ‘‘followed standard
    operating procedures,’’ there is no evidence that Degnan independently
    verified the accuracy of the profile beyond simply relying on the group’s
    representation that they adhered to standard protocol. See part III of this
    opinion.
    12
    As an independent basis for concluding that the admission of the DNA
    evidence did not violate the confrontation clause, the plurality reasoned
    that, to the extent the substance of the outside laboratory’s report was
    admitted into evidence—the report itself was not offered as an exhibit—it
    was offered not for its truth but, rather, to explain the assumptions upon
    which the testifying analyst based her expert opinion that the DNA profile
    from the vaginal swabs matched the defendant’s DNA. Williams v. 
    Illinois, supra
    , 
    567 U.S. 57
    –58. The plurality concluded that the out-of-court state-
    ments were not hearsay and, therefore, that they fell outside the scope of
    the confrontation clause. 
    Id., 58. Five
    justices, however, disagreed with this
    reasoning. 
    Id., 104–109 (Thomas,
    J., concurring in judgment); 
    id., 125–32 (Kagan,
    J., dissenting). The state concedes that this aspect of Williams is
    not relevant in the present case because the out-of-court statements made
    by the known processing group concerning the defendant’s known DNA
    profile were offered for their truth and not merely to explain the basis for
    Degnan’s opinion that the defendant’s DNA matched the DNA found on
    the bandana.
    13
    The state relies on State v. Ortiz, 
    238 Ariz. 329
    , 
    360 P.3d 125
    (App.
    2015), State v. Lui, 
    179 Wash. 2d 457
    , 
    315 P.3d 493
    , cert. denied, 
    573 U.S. 933
    ,
    
    134 S. Ct. 2842
    , 
    189 L. Ed. 2d 810
    (2014), and State v. Deadwiller, 
    350 Wis. 2d
    138, 
    834 N.W.2d 362
    (2013), in support of its claim that the defendant’s
    DNA profile was not testimonial. In each of those cases, however, the courts
    decided the testimonial question by applying the three Williams rationales
    to the facts of the case to determine how five justices would have ruled.
    See State v. 
    Ortiz, supra
    , 341; State v. 
    Lui, supra
    , 478–79; State v. 
    Deadwiller, supra
    , 162–63. As previously explained in this opinion, however, we decline
    to apply Williams in this manner, as that case resulted in no controlling
    holding. See State v. 
    Sinclair, supra
    , 
    332 Conn. 225
    . Instead, we ‘‘rely on
    Supreme Court precedent before Williams to the effect that a statement
    triggers the protections of the [c]onfrontation [c]lause when it is made with
    the primary purpose of creating a record for use at a later criminal trial.’’
    (Internal quotation marks omitted.) 
    Id. Accordingly, given
    our decision in
    Sinclair, we do not find the cases cited by the state persuasive.