Commonwealth v. Clark , 472 Mass. 120 ( 2015 )


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    SJC-11815
    COMMONWEALTH   vs.   TYRONE J. CLARK.
    Suffolk.     March 2, 2015. - July 9, 2015.
    Present:   Gants, C.J., Spina, Cordy, Botsford, Duffly, Lenk, &
    Hines, JJ.
    Deoxyribonucleic Acid. Evidence, Scientific test, Exculpatory,
    Relevancy and materiality. Statute, Construction.
    Practice, Criminal, Postconviction relief, Discovery.
    Indictments found and returned in the Superior Court on
    August 10, 1973.
    A postconviction motion for scientific or forensic
    analysis, filed on August 5, 2013, was heard by Thomas A.
    Connor, J.
    The Supreme Judicial Court on its own initiative
    transferred the case from the Appeals Court.
    Neil D. Raphael for Tyrone J. Clark.
    Donna Jalbert Patalano, Assistant District Attorney, for
    the Commonwealth.
    Lisa M. Kavanaugh & Ira L. Gant, Committee for Public
    Counsel Services, & Denise McWilliams & Chauncey B. Wood, for
    Committee for Public Counsel Services Innocence Program &
    others, amici curiae, submitted a brief.
    2
    SPINA, J.    On January 23, 1974, a Suffolk County jury
    convicted Tyrone J. Clark of rape, G. L. c. 265, § 22; unarmed
    robbery, G. L. c. 265, § 19; and kidnapping, G. L. c. 265, § 26.
    The Appeals Court affirmed the convictions in a published
    opinion.   See Commonwealth v. Clark, 
    3 Mass. App. Ct. 481
    (1975).    On January 14, 2000, he filed a motion for a new trial,
    which was denied.   Clark was paroled in 2005, but his parole was
    revoked when he pleaded guilty on May 25, 2006, to larceny over
    $250, G. L. c. 266, § 30 (1).
    In 2012, the Legislature enacted G. L. c. 278A, "An Act
    providing access to forensic and scientific analysis" (act).
    St. 2012, c. 38.    "The enactment, which occurred in the wake of
    national recognition that 'DNA testing has an unparalleled
    ability both to exonerate the wrongly convicted and to identify
    the guilty,' District Attorney's Office for the Third Judicial
    Dist. v. Osborne, 
    557 U.S. 52
    , 55 (2009), permits access to
    forensic and scientific evidence on the filing of a motion by an
    individual who has been convicted of a criminal offense, who
    consequently has been incarcerated, and who asserts factual
    innocence."   Commonwealth v. Wade, 
    467 Mass. 496
    , 497 (2014).
    See G. L. c. 278A, § 2.    The purpose of the act was "to remedy
    the injustice of wrongful convictions of factually innocent
    persons by allowing access to analyses of biological material
    with newer forensic and scientific techniques . . . [that]
    3
    provide a more reliable basis for establishing a factually
    correct verdict than the evidence available at the time of the
    original conviction."   Wade, supra at 504, quoting 2011 Senate
    Doc. No. 753 and 2011 House Doc. No. 2165.   The act created a
    process, separate from the trial and any subsequent proceedings
    challenging an underlying conviction, that permits forensic and
    scientific analysis of evidence or biological material, the
    results of which could support a motion for a new trial.    See
    G. L. c. 278A, §§ 3, 6, 7; Wade, supra at 505.
    On August 5, 2013, Clark filed in the Superior Court a
    postconviction motion pursuant to G. L. c. 278A, § 3 (§ 3
    motion), for forensic or scientific analysis of certain evidence
    presented at his trial, and for discovery regarding the location
    of other items that were referenced at trial but not admitted in
    evidence.   More specifically, he sought deoxyribonucleic acid
    (DNA) testing of the handle of a kitchen knife that the victim
    purportedly grabbed from her assailant and stabbed into the
    assailant's shoulder.   He also sought discovery concerning the
    victim's bloody clothing, a bloody towel, and a pair of men's
    socks, all of which, in Clark's view, might contain DNA evidence
    and should be made available to him for potential testing under
    G. L. c. 278A.   In connection with his § 3 motion, Clark filed
    an affidavit stating that he is factually innocent of the crimes
    of which he was convicted.   The Commonwealth opposed Clark's
    4
    motion, contending that Clark had not shown how forensic testing
    of the knife handle would provide evidence material to the
    identification of the perpetrator of the crimes, that Clark had
    shown no chain of custody for the knife handle, that the jurors
    had based their verdicts on compelling identification evidence,
    and that the Commonwealth did not possess any of the items for
    which Clark sought discovery.   Following a hearing, a judge, who
    was not the trial judge, denied Clark's § 3 motion.1
    Clark appealed the judge's order,2 the case was entered in
    the Appeals Court, and we transferred it to this court on our
    own motion.   Clark contends on appeal that the judge
    misinterpreted the requirements for postconviction DNA analysis
    as set forth in the plain language of G. L. c. 278A and,
    consequently, erred in denying his motion for such testing and
    for related discovery.   For the reasons that follow, we conclude
    that Clark met the requirements of G. L. c. 278A, § 3; that the
    judge erred in determining that Clark was required to establish
    the existence of biological material on the handle of the knife;
    that the judge properly denied Clark's request for discovery;
    1
    At the time the judge ruled on Tyrone J. Clark's motion
    pursuant to G. L. c. 278A, he did not have the benefit of our
    decision in Commonwealth v. Wade, 
    467 Mass. 496
     (2014), which is
    discussed in the statutory framework portion of this opinion.
    2
    General Laws c. 278A, § 18, provides that "[a]n order
    allowing or denying a motion for forensic or scientific analysis
    filed under this chapter shall be a final and appealable order."
    5
    and that the judge must make findings of fact and conclusions of
    law regarding whether Clark satisfied G. L. c. 278A,
    § 7 (b) (2), (3), (5), and (6).    Accordingly, we reverse the
    judge's order denying Clark's § 3 motion, and remand for further
    proceedings consistent with this opinion.3
    1.    Statutory framework.   Before setting forth the
    underlying facts in this case, we begin with an overview of
    G. L. c. 278A, so as to put the present proceedings in context.
    In Wade, a case that raised issues of first impression regarding
    the proper interpretation of G. L. c. 278A, this court
    considered the threshold requirements that must be met by a
    party seeking forensic or scientific analysis pursuant to § 3,
    and articulated the standard of review for determining whether
    those requirements have been satisfied.    See Wade, 467 Mass. at
    501-506.   We stated that G. L. c. 278A "creates a two-step
    procedure for requesting DNA testing or analysis.    First, a
    threshold determination is made by the court in which the
    conviction was entered as to whether the motion meets the
    preliminary criteria set forth in G. L. c. 278A, § 3.        If those
    criteria are met, a hearing 'shall' be conducted pursuant to
    G. L. c. 278A, §§ 6 and 7, to determine whether a petitioner has
    3
    We acknowledge the amicus brief submitted in support of
    Clark by the Committee for Public Counsel Services Innocence
    Program, New England Innocence Project, Innocence Network, and
    Massachusetts Association of Criminal Defense Lawyers.
    6
    established by a preponderance of the evidence sufficient facts
    for a judge to order DNA testing or further discovery."    Id. at
    501.
    With respect to the threshold inquiry, a person seeking
    relief under G. L. c. 278A shall file a motion that includes all
    of the information set forth in § 3 (b),4 and, "when relevant,
    shall include specific references to the record in the
    underlying case," or to supporting affidavits "signed by a
    4
    General Laws c. 278A, § 3 (b), provides that the motion
    shall include the following information:
    "(1) the name and a description of the requested forensic
    or scientific analysis;
    "(2) information demonstrating that the requested analysis
    is admissible as evidence in courts of the commonwealth;
    "(3) a description of the evidence or biological material
    that the moving party seeks to have analyzed or tested,
    including its location and chain of custody if known;
    "(4) information demonstrating that the analysis has the
    potential to result in evidence that is material to the
    moving party's identification as the perpetrator of the
    crime in the underlying case; and
    "(5) information demonstrating that the evidence or
    biological material has not been subjected to the requested
    analysis because [of one of five reasons enumerated in
    G. L. c. 278A, § 3 (b) (5)]."
    Pursuant to G. L. c. 278A, § 3 (c), "[i]f the moving party is
    unable to include for filing with the motion any of the items or
    information described in subsection (b), or if the moving party
    lacks items or information necessary to establish any of the
    factors listed in [§ 7 (b)], the moving party shall include a
    description of efforts made to obtain such items and information
    and may move for discovery of such items or information from the
    prosecuting attorney or any third party."
    7
    person with personal knowledge of the factual basis of the
    motion."   G. L. c. 278A, § 3 (b).   Accompanying the motion shall
    be "an affidavit stating that the moving party is factually
    innocent of the offense of conviction and that the requested
    forensic or scientific analysis will support the claim of
    innocence."   Id. at § 3 (d).   The Commonwealth "may provide a
    response to the motion, to assist the court in considering
    whether the motion meets the requirements [of § 3]."      Id. at
    § 3 (e).   Then, a judge shall review the motion expeditiously
    and "shall dismiss, without prejudice, any such motion without a
    hearing if the court determines, based on the information
    contained in the motion, that the motion does not meet the
    requirements set forth in [§ 3]."    Id.   The court "shall notify"
    the parties as to whether the motion is dismissed, or whether it
    is sufficient to proceed to the next level of review under § 7.
    Id.
    The threshold inquiry made pursuant to § 3 is "limited,
    based primarily on the moving party's filings, and . . .
    essentially nonadversarial."    Wade, 467 Mass. at 503.   At this
    first stage, "a moving party is not required to 'establish any
    of the [statutory] factors' alleged in the § 3 motion."      Id. at
    503-504, quoting G. L. c. 278A, § 3 (c).     See Commonwealth v.
    Donald, 
    468 Mass. 37
    , 41 (2014) ("a moving party is required
    only to point to the existence of specific information that
    8
    satisfies the statutory requirements").     "Viewed in light of the
    act as a whole, the Legislature clearly intended that, to
    proceed to a hearing, a § 3 motion requires only the limited
    showing set forth explicitly in G. L. c. 278A, § 3 (b) and (d),
    and review of the motion in order to determine whether a hearing
    will be conducted is confined to the assertions in the motion,
    the affidavits and supporting documents attached thereto, and
    any response that may be filed by the Commonwealth to assist the
    court."   Wade, supra at 504.   A judge conducting an inquiry
    under § 3 "is not called upon to make credibility
    determinations, or to consider the relative weight of the
    evidence or the strength of the case presented against the
    moving party at trial."   Id. at 505-506.
    If a motion meets the requirements of § 3, then a judge
    "shall order a hearing on the motion."      G. L. c. 278A, § 6 (a).
    The Commonwealth "shall file a response with the court within
    [sixty] days" after the court issues notice of further
    proceedings, id. at § 4 (b), and "shall include any specific
    legal or factual objections" it may have "to the requested
    analysis."   Id. at § 4 (c).    After reviewing the motion,
    together with the Commonwealth's response, and holding the
    requisite hearing, the judge shall determine whether the moving
    party has demonstrated, by a preponderance of the evidence, all
    9
    of the criteria set forth in G. L. c. 278A, § 7 (b).5   See id. at
    § 7 (a), (b).   If the moving party has done so, then the judge
    "shall allow the requested forensic or scientific analysis."6
    Id. at § 7 (b).   The judge is required to "state findings of
    fact and conclusions of law on the record," or issue written
    findings and conclusions "that support the decision to allow or
    deny [the] motion brought under [§] 3."   Id. at § 7 (a).    In
    5
    General Laws c. 278A, § 7 (b), provides that the moving
    party shall demonstrate the following criteria by a
    preponderance of the evidence:
    "(1) that the evidence or biological material exists;
    "(2) that the evidence or biological material has been
    subject to a chain of custody that is sufficient to
    establish that it has not deteriorated, been substituted,
    tampered with, replaced, handled or altered such that the
    results of the requested analysis would lack any probative
    value;
    "(3) that the evidence or biological material has not been
    subjected to the requested analysis for any of the reasons
    in [§ 3 (b) (5) (i)-(v)];
    "(4) that the requested analysis has the potential to
    result in evidence that is material to the moving party's
    identification as the perpetrator of the crime in the
    underlying case;
    "(5) that the purpose of the motion is not the obstruction
    of justice or delay; and
    "(6) that the results of the particular type of analysis
    being requested have been found to be admissible in courts
    of the commonwealth."
    6
    Where forensic or scientific analysis is allowed, G. L.
    c. 278A, § 8, sets forth the conditions by which such analysis
    should proceed.
    10
    addition, the judge may authorize discovery, as appropriate,
    pursuant to G. L. c. 278A, § 7 (c).
    2.   Factual and procedural background.   We rely on the
    facts set forth in Clark, 3 Mass. App. Ct. at 482-484, and in
    the judge's memorandum of decision denying Clark's § 3 motion.
    On the afternoon of June 23, 1973, the victim, a twenty-
    three year old woman, was returning to her apartment on Park
    Drive in Boston from a shopping trip.    As she approached the
    door to her building, an assailant grabbed her from behind,
    followed her into the vestibule, struck her, and demanded her
    money.    The assailant forced the victim upstairs to her
    apartment.   After entering the apartment, he pulled the victim
    into the kitchen, took a knife from a drawer, and then dragged
    her into the bedroom where he repeatedly struck her in the face,
    told her to undress, and brutally raped her.    At one point
    during this assault, the victim wrested the knife from her
    assailant's grip and "attempted to stab him in the back,"
    striking him in the shoulder.    The blade of the knife broke off
    during the struggle.7
    After this initial attack, the assailant ordered the victim
    to get dressed and come with him.    The victim put on her clothes
    7
    Photographs of the   knife show that a small portion of the
    base of the blade remains   attached to the handle. When we speak
    about the knife handle in   this opinion, we are referring to the
    actual wooden handle plus   the small portion of the blade that
    remains attached to it.
    11
    and used a towel from the kitchen to wash the blood from her
    face.   When she had finished, the assailant grabbed the towel
    and used it to wipe fingerprints off the wall where he had been
    leaning.    As they were leaving the apartment, the assailant told
    the victim, "I've got a gun and if you try to escape I will
    shoot you or anyone else that tries to help you."
    The assailant led the victim through the Fenway section of
    Boston and took her to a small Spanish restaurant on Tremont
    Street in an area that was unfamiliar to her.    They stayed for
    about fifteen minutes while the assailant had something to eat.
    The victim testified that she did not attempt to ask for help
    because she believed that none of the restaurant employees
    understood English.
    After leaving the restaurant, the assailant and the victim
    proceeded to board a bus.    She whispered to the driver for help,
    but he made no effort to come to her aid.    The assailant and the
    victim got off the bus at the next stop.    He led the victim to a
    secluded area, demanded that she undress again, forced her to
    perform oral sex, and threatened to kill her.    They then left
    the secluded area.    As they passed a fire station, the victim
    broke away from her assailant, ran into the station, and grabbed
    one of the fire fighters, screaming for help.    The assailant
    followed the victim into the fire station and said, "I want my
    woman."    When one of the fire fighters suggested that they call
    12
    the police, the assailant fled the scene.    The victim was taken
    to Boston City Hospital, where she was treated for sexual
    assault.
    The following day, Detective John Farrell recovered from
    the victim's apartment the handle of the knife and a pair of
    men's socks.8   The blade of the knife was not found.   It also
    appears that the bloody towel was never recovered by the police.
    That same day, the victim went to Boston police headquarters
    where she viewed numerous photographs based on her description
    of the assailant, but she was unable to make an identification.
    On June 25, Detective Farrell showed the victim a group of
    eleven photographs, from which she selected the photograph of
    Clark as her assailant.    The proprietor of the Spanish
    restaurant and four fire fighters also chose his photograph from
    the same array.    Clark was arrested on June 26 and taken to the
    police station, where he was told to remove his clothes.
    Detective Farrell examined Clark and did not observe any
    puncture marks or knife wounds on his back.    At trial, the
    victim and each of the five witnesses who had selected Clark's
    photograph from the array identified him as the assailant.       On
    January 23, 1974, a jury convicted Clark of rape, unarmed
    robbery, and kidnapping.
    8
    The socks were never introduced in evidence at trial.
    13
    In his memorandum of decision denying Clark's § 3 motion,
    the judge first concluded that, with respect to the request for
    DNA testing of the knife handle, Clark had not satisfied his
    burden of proving that such analysis had the potential to yield
    evidence that would be material to his identification as the
    perpetrator of the underlying offenses, as required by
    § 7 (b) (4).   See note 5, supra.   The judge recognized that
    G. L. c. 278A should not be applied in "an overly stringent or a
    grudging fashion."   Nonetheless, he stated that the mere
    existence of the knife handle, without a reasonable possibility
    of biological material thereon, was insufficient to satisfy
    § 7 (b) (4).   The judge pointed out that the victim's trial
    testimony provided no factual basis for a finding that the knife
    came in contact with Clark's skin, or that he ever bled as a
    consequence of the victim's effort to stab him.   The judge said
    that even though § 7 (b) (1) refers to the existence of
    "evidence or biological material," not both, § 7 (b) (4)
    implicitly requires a showing, by a preponderance of the
    evidence, of some biological material on the knife handle
    because the requested DNA analysis must have "the potential to
    result in evidence that is material to the moving party's
    identification as the perpetrator."   In the judge's view, there
    is always a theoretical possibility that the knife handle or any
    item seized from the crime scene could yield some biological
    14
    material tied to the victim's assailant, but this possibility
    did not relieve Clark of his burden of making a threshold
    showing that there exists some realistic potential, grounded in
    the facts of the case, that a particular item could yield
    exculpatory evidence.
    The judge next considered Clark's request for discovery
    regarding a pair of men's socks and a bloody towel.    With
    respect to the socks,9 the judge said that Clark's reliance on
    Detective Farrell's testimony that he recovered the socks from
    the victim's apartment was insufficient to satisfy the
    materiality requirement of § 7 (b) (4) where there was no
    evidence that the socks once belonged to, or were touched by,
    the victim's assailant.   The judge also took note of the
    Commonwealth's assertion that it did not possess the socks.     He
    concluded that Clark had not satisfied his burden of
    demonstrating, by a preponderance of the evidence, that
    searching for and testing the socks would provide evidence
    material to the identification of the perpetrator of the
    underlying crimes.   With respect to the bloody towel, the judge
    said that there was no evidence in the record that the towel was
    9
    At the hearing, Clark's attorney clarified that he wanted
    to interview the keeper of the records of the Suffolk County
    district attorney's office and to inspect the premises of that
    office in an effort to ascertain the location and significance
    of the socks.
    15
    recovered by the police.   He again took note of the
    Commonwealth's assertion that it did not possess the towel.    The
    judge concluded that the record failed to establish a reasonable
    possibility that the towel had been preserved or that it would
    produce any evidence material to the identification of the
    perpetrator.   Accordingly, the judge declined to authorize
    discovery with respect to either the socks or the towel.10
    3.   Forensic and scientific analysis under G. L. c. 278A.
    Clark contends in this appeal that the judge interpreted the
    requirements of G. L. c. 278A in a manner that misconstrues the
    plain language and legislative intent of the act.   He asserts
    that, pursuant to § 7 (b) (1), he was required to demonstrate,
    by a preponderance of the evidence, "that the evidence or
    biological material exists" (emphasis added).   Clark argues that
    he satisfied this criterion by demonstrating the existence of
    the handle of the knife that was used by the assailant to
    threaten the victim and by the victim to stab her assailant.     He
    points out that he could not yet demonstrate the existence of
    biological material on the handle where such circumstance was
    10
    In the present appeal, Clark has not challenged the
    judge's decision as to discovery regarding the towel.
    Therefore, we do not consider the matter further. Similarly, at
    the hearing, Clark's attorney did not discuss the victim's
    bloody clothing, and the judge made no mention of those clothes
    in his memorandum of decision. Because Clark has not objected
    to this aspect of the judge's decision, it is not open to
    review.
    16
    the reason he sought DNA analysis in the first place.   Moreover,
    he continues, this additional proof was not required under
    § 7 (b) (1).   Clark further claims that he satisfied § 7 (b) (4)
    because the requested DNA testing of the handle has the
    potential to identify the perpetrator of the underlying crimes.
    In his view, the judge's interpretation of the provisions of
    G. L. c. 278A thwarts the purpose of the act, which is to
    provide a mechanism for greater access to postconviction DNA
    analysis.
    "We review questions of statutory interpretation de novo."
    Wade, 467 Mass. at 501.   Our analysis of the provisions of G. L.
    c. 278A is guided by the familiar principle that "a statute must
    be interpreted according to the intent of the Legislature
    ascertained from all its words construed by the ordinary and
    approved usage of the language, considered in connection with
    the cause of its enactment, the mischief or imperfection to be
    remedied and the main object to be accomplished, to the end that
    the purpose of its framers may be effectuated."   Hanlon v.
    Rollins, 
    286 Mass. 444
    , 447 (1934).   See Wade, supra; Sullivan
    v. Brookline, 
    435 Mass. 353
    , 360 (2001).   Courts must ascertain
    the intent of a statute from all its parts and from the subject
    matter to which it relates, and must interpret the statute so as
    to render the legislation effective, consonant with sound reason
    and common sense.   See Champigny v. Commonwealth, 
    422 Mass. 249
    ,
    17
    251 (1996); Pentucket Manor Chronic Hosp., Inc. v. Rate Setting
    Comm'n, 
    394 Mass. 233
    , 240 (1985).
    As we have noted, at the time the judge ruled on Clark's
    § 3 motion, he did not have the benefit of our decision in Wade.
    See note 1, supra.   Consequently, neither the judge's memorandum
    of decision nor the Superior Court docket indicates that the
    judge specifically considered whether the motion met the
    criteria set forth in § 3.   Instead, the judge proceeded to hold
    a hearing, as is statutorily mandated pursuant to G. L. c. 278A,
    § 6 (a), in those cases where a motion has satisfied the
    requirements of § 3, and to consider whether Clark had
    demonstrated, by a preponderance of the evidence, the
    requirements of § 7 (b).   Given that the judge did not dismiss
    the motion prior to holding a hearing, we could infer that he
    implicitly determined that the information presented in the
    motion met the criteria of § 3.     However, as we explained in
    Wade, 467 Mass. at 501, the procedure for requesting DNA testing
    under G. L. c. 278A is a two-step process, the first step of
    which requires a judge to make a threshold determination whether
    a motion meets the requirements of § 3, and to notify the
    parties "as to whether the motion is sufficient to proceed under
    [G. L. c. 278A] or is dismissed."    G. L. c. 278A, § 3 (e).      That
    did not happen in this case, and the Commonwealth argues on
    appeal that Clark's motion failed to meet the preliminary
    18
    criteria set forth in § 3.   Because the threshold inquiry under
    § 3 does not require a judge "to make credibility
    determinations, or to consider the relative weight of the
    evidence or the strength of the case presented against the
    moving party at trial," Wade, supra at 505-506, but, rather, is
    based on documentary evidence (the motion and any response that
    may be provided by the Commonwealth), we stand in the same
    position as the judge in determining whether the information
    presented in the motion meets the requirements of § 3.     See
    generally Commonwealth v. Hoyt, 
    461 Mass. 143
    , 148-149 (2011)
    (appellate court in same position as motion judge to evaluate
    documentary evidence); Commonwealth v. Novo, 
    442 Mass. 262
    , 266
    (2004).   Accordingly, we first shall consider whether Clark's
    motion met the preliminary criteria set forth in § 3.    If it
    did, we then shall proceed to determine whether the judge
    properly denied Clark's motion on the ground that Clark failed
    to satisfy § 7 (b) (4) where he did not show that some
    biological material exists on the knife handle.   Finally, we
    shall consider infra whether the judge properly denied Clark's
    request for discovery regarding the pair of men's socks.     See
    note 10, supra.
    We begin with an analysis of G. L. c. 278A, § 3, mindful of
    the fact that Clark is only required "to point to the existence
    of specific information that satisfies the statutory
    19
    requirements," Donald, 468 Mass. at 41, and need not make an
    evidentiary showing by a preponderance of the evidence.      See
    Wade, 467 Mass. at 501, 503-504.    Compare G. L. c. 278A,
    § 3 (b), with G. L. c. 278A, § 7 (b).    First, Clark was required
    to set forth in his motion "the name and a description of the
    requested forensic or scientific analysis."    G. L. c. 278,
    § 3 (b) (1).    He stated that he was seeking DNA testing, using
    the Y-chromosome short tandem repeat (Y-STR) method,11 on the
    handle of the knife that the victim grabbed from her assailant
    and attempted to stab into his back, striking the assailant in
    the shoulder.    We conclude that Clark met the requirements of
    § 3 (b) (1).
    Second, Clark was required to set forth in his motion
    "information demonstrating that the requested analysis is
    admissible as evidence in courts of the commonwealth."    G. L.
    c. 278A, § 3 (b) (2).    He correctly stated that the results of
    DNA testing using the Y-STR method are admissible in
    Massachusetts courts.    See, e.g., Commonwealth v. Bizanowicz,
    
    459 Mass. 400
    , 406-407 (2011).    We conclude that Clark met the
    requirement of § 3 (b) (2).
    11
    The Y-chromosome short tandem repeat (Y-STR) method looks
    at deoxyribonucleic acid (DNA) on the Y-chromosome, found
    exclusively in males. See Commonwealth v. Issa, 
    466 Mass. 1
    , 4
    (2013).
    20
    Third, Clark was required to set forth in his motion "a
    description of the evidence or biological material that [he]
    seeks to have analyzed or tested, including its location and
    chain of custody if known."     G. L. c. 278A, § 3 (b) (3).   He
    stated that he was seeking to have DNA testing performed on any
    physical evidence ascertainable from the handle of the knife,
    including blood evidence.     Clark further stated that the handle
    was in the possession of the Suffolk County district attorney's
    office and that, as far as he and his attorney were aware, it
    had been in the custody of that office since 1973, when his case
    was tried.     In the Commonwealth's view, Clark failed to
    adequately describe the chain of custody of the knife handle.
    We disagree.     Section 3 (b) (3) provides that the location and
    chain of custody of evidence or biological material that a
    moving party seeks to have analyzed shall be described "if
    known."   This language plainly suggests that there may be
    instances when such information is not known to a moving party,
    and this circumstance will not be an impediment to satisfying
    § 3 (b) (3).    Clark described the current location of the knife
    handle, as well as its chain of custody to the extent that he
    had knowledge of the matter.     We conclude that Clark met the
    requirements of § 3 (b) (3).
    Fourth, Clark was required to set forth in his motion
    "information demonstrating that the analysis has the potential
    21
    to result in evidence that is material to the moving party's
    identification as the perpetrator of the crime in the underlying
    case."    G. L. c. 278A, § 3 (b) (4).   He stated that the knife
    handle was the only physical evidence introduced at trial, and
    he referred to the victim's testimony that she grabbed the knife
    from her assailant and attempted to stab him in the back,
    striking the assailant in the shoulder and causing the blade to
    break off.    Further, Clark denied knowing the victim or having
    committed the charged crimes, and he pointed out that he had no
    wounds on his body at the relevant time.    Clark stated that DNA
    analysis of any physical evidence on the knife handle would be
    material to his identification as the perpetrator of the crimes.
    In support of his motion, Clark submitted an affidavit from Dr.
    Robin W. Cotton, an associate professor in the department of
    anatomy and neurobiology and the director of the biomedical
    forensic sciences program at Boston University School of
    Medicine.12   She opined that "[w]hile the evidence in this case
    is old, it is possible that upon examination of the knife handle
    and partial blade by an accredited laboratory, . . . there may
    be biological material on the handle or the remaining portion of
    12
    Prior to her employment at Boston University School of
    Medicine, Dr. Robin W. Cotton was the forensic laboratory
    director of Cellmark Diagnostics (later Orchid Cellmark), a
    private laboratory that specializes in providing forensic DNA
    testing services.
    22
    the blade which is from the perpetrator and that could be tested
    utilizing Y-STR DNA testing."   See note 7, supra.
    We have said that the threshold requirement of § 3 (b) (4)
    is a "modest" one.   Wade, 467 Mass. at 507.   The moving party
    only needs to present information showing that the forensic or
    scientific analysis has "the potential to result in evidence
    that is material to the moving party's identification as the
    perpetrator of the crime" (emphasis added).    G. L. c. 278A,
    § 3 (b) (4).   Doctor Cotton opined that, notwithstanding the age
    of the evidence in this case, it was possible that biological
    material from the perpetrator was present on the knife handle.13
    13
    The purported absence of visible biological material on
    the handle of the knife is of no import where such material may
    consist of skin cells or occult blood, which cannot be seen with
    the naked eye. See Commonwealth v. Girouard, 
    436 Mass. 657
    , 660
    n.3 (2002). Although the focus of Clark's § 3 motion is DNA
    analysis of potential blood evidence on the knife handle, we
    recognize the possibility that DNA from skin cells, so-called
    "touch DNA" or "trace DNA," may be present on the handle and
    could have the potential to yield material evidence regarding
    the perpetrator of the underlying crimes. In 1997, a scientific
    journal "reported that DNA profiles could be generated from
    touched objects. This opened up possibilities and led to the
    collection of DNA from a wider range of exhibits (including:
    tools, clothing, knives, vehicles, firearms, food, bedding,
    condoms, lip cosmetics, wallets, [jewelry], glass, skin, paper,
    cables, windows, doors, and stones)." van Oorschot, Ballantyne,
    & Mitchell, Forensic Trace DNA: A Review, 1:14 Investigative
    Genetics 1, 2 (2010) (Forensic Trace DNA), citing van Oorschot &
    Jones, DNA Fingerprints from Fingerprints, 387 Nature 767 (June
    1997). "[T]ouched objects provide a wide scope for revealing
    [an] offender's DNA profile." Forensic Trace DNA, supra.
    Although referring to a single term such as "touch DNA" or
    "trace DNA" may be "a misleading simplification of a series of
    complex processes," either term can be appropriate "when
    23
    The testimony of the victim, coupled with the apparent absence
    of wounds on Clark's body, could suggest that the victim stabbed
    someone other than Clark.   Testing of the knife handle has the
    potential to produce a DNA profile that does not match the
    profile of Clark and, therefore, would be material to the
    identification of Clark as the perpetrator of the underlying
    crimes.   Whether Clark is likely to obtain such a forensic
    result "is not relevant to the analysis."   Wade, supra at 508.
    Moreover, the Legislature "did not condition access to
    [scientific] testing on some degree of proof that the test
    results will raise doubt about the conviction."14   Id. at 509.
    We conclude that Clark met the requirement of § 3 (b) (4).
    Fifth, Clark was required to set forth in his motion
    "information demonstrating that the evidence or biological
    material has not been subjected to the requested analysis" for
    referring to the collection of minute biological samples at [a]
    crime scene or the process of collecting and extracting the tiny
    amounts of material within the sample in the forensic
    laboratory." Id. Generally speaking, "trace DNA" refers to
    either "very limited and/or invisible biological samples" or
    amounts of DNA that are less than a defined threshold limit.
    Id. at 3.
    14
    We have recognized that "[t]he language of G. L. c. 278A,
    § 3 (b), sets a far lower bar for access to scientific testing
    than that required by similar statutes in other States." Wade,
    467 Mass. at 509 & n.16.
    24
    one of five enumerated reasons.15   G. L. c. 278A, § 3 (b) (5).
    He correctly stated, in accordance with § 3 (b) (5) (i), that
    when he was convicted of the underlying crimes in 1974, DNA
    analysis had not yet been developed.   See Commonwealth v.
    Curnin, 
    409 Mass. 218
    , 221 (1991), and cases cited ("The use of
    DNA testing for forensic purposes is of very recent origin").
    We conclude that Clark met the requirement of § 3 (b) (5).
    Finally, Clark was required to file with his § 3 motion "an
    affidavit stating that [he] is factually innocent of the offense
    15
    General Laws c. 278A, § 3 (b) (5), requires a moving
    party to demonstrate that the requested forensic or scientific
    analysis has not been performed because
    "(i) the requested analysis had not yet been developed at
    the time of the conviction;
    "(ii) the results of the requested analysis were not
    admissible in the courts of the commonwealth at the time of
    the conviction;
    "(iii) the moving party and the moving party's attorney
    were not aware of and did not have reason to be aware of
    the existence of the evidence or biological material at the
    time of the underlying case and conviction;
    "(iv) the moving party's attorney in the underlying case
    was aware at the time of the conviction of the existence of
    the evidence or biological material, the results of the
    requested analysis were admissible as evidence in courts of
    the commonwealth, a reasonably effective attorney would
    have sought the analysis and either the moving party's
    attorney failed to seek the analysis or the judge denied
    the request; or
    "(v) the evidence or biological material was otherwise
    unavailable at the time of the conviction."
    25
    of conviction and that the requested forensic or scientific
    analysis will support the claim of innocence."16   G. L. c. 278A,
    § 3 (d).   Clark did file such an affidavit in which he asserted
    that he "did not commit[] the offenses of Unarmed Robbery, Rape,
    and Kidnapping," and that he was "requesting forensic or
    scientific testing in this case because [he] believe[s] that the
    results of this testing will support [his] claim of factual
    innocence."   No more was required under the plain and
    unambiguous language of the statute.   We are cognizant of the
    fact that the affidavit from Dr. Cotton did not specifically
    aver that DNA analysis of the knife handle would support Clark's
    assertion.    However, nothing in § 3 (d) requires a moving party
    to submit with his or her affidavit supporting evidence to
    substantiate a claim of factual innocence.   We conclude that
    Clark met the requirements of § 3 (d).
    Based on our review of Clark's § 3 motion, together with
    his affidavit of factual innocence and the supporting affidavit
    of Dr. Cotton, as well as the response from the Commonwealth, we
    determine that Clark has met all of the threshold requirements
    set forth in G. L. c. 278A, § 3, for DNA analysis.   Given that
    16
    General Laws c. 278A, § 1, defines "[f]actually innocent"
    as "a person convicted of a criminal offense who did not commit
    that offense." Accordingly, "to assert factual innocence, a
    moving party must assert that he did not commit the offense of
    which he was convicted." Wade, 467 Mass. at 512.
    26
    the judge already has held a hearing on the motion,17 we proceed
    to consider whether he properly denied Clark's motion under
    G. L. c. 278A, § 7, based on his conclusion that Clark did not
    satisfy § 7 (b) (4) because Clark failed to establish a
    reasonable possibility that some biological material exists on
    the knife handle.
    General Laws c. 278A, § 7 (b), provides that a judge "shall
    allow the requested forensic or scientific analysis" if all six
    enumerated criteria "ha[ve] been demonstrated by a preponderance
    of the evidence."   See note 5, supra.   Pursuant to § 7 (b) (1),
    Clark was required to show that "the evidence or biological
    material exists" (emphasis added).    The word "or" has "a
    disjunctive meaning unless the context and the main purpose of
    all the words demand otherwise."     Eastern Mass. St. Ry. v.
    Massachusetts Bay Transp. Auth., 
    350 Mass. 340
    , 343 (1966).       The
    language of § 7 (b) does not demand, or even suggest, that the
    Legislature's use of the word "or" to distinguish between
    "evidence" and "biological material" should be construed as
    other than disjunctive, thereby identifying two alternative
    sources for forensic or scientific analysis.    Clark satisfied
    the terms of § 7 (b) (1) by showing that evidence -- the handle
    17
    No witnesses provided testimony at the hearing. Counsel
    for Clark and the Commonwealth simply presented their arguments
    to the judge.
    27
    of the knife used to commit the underlying crimes -- exists.      He
    was not required to also demonstrate the presence of biological
    material on the knife handle.    Such a construction of the
    statutory language would undermine its plain and unambiguous
    terms.   See Commonwealth v. Brown, 
    431 Mass. 772
    , 775 (2000)
    ("When the language of a statute is plain and unambiguous, it
    must be given its ordinary meaning").
    In addition to demonstrating the existence of the knife
    handle, Clark was required to show that the requested DNA
    analysis "has the potential to result in evidence that is
    material to the moving party's identification as the perpetrator
    of the crime in the underlying case" (emphasis added).    G. L.
    c. 278A, § 7 (b) (4).   Given his lack of access to the knife
    handle since his convictions, Clark could not point to any
    visual evidence of biological material on the handle.
    Therefore, he had to rely on the victim's trial testimony where
    she stated that her assailant "found [a] kitchen knife," he
    "proceeded to rape [her] with the knife at [her] throat," she
    eventually "grabbed the knife," she "attempted to stab him in
    the back," and she struck him in the shoulder, at which point
    the blade broke off.    This testimony suggests that Clark's
    request for DNA analysis of the handle has the "potential" to
    result in evidence -- a DNA profile -- that is material to
    Clark's identification as the perpetrator of the underlying
    28
    crimes.   Where the assailant was holding onto the knife for a
    period of time and the victim believed that she stabbed the
    assailant in the shoulder, skin cells and blood may be present
    on the handle.   See note 13, supra.    The Legislature's use of
    the word "potential" in § 7 (b) (4) suggests an awareness of the
    fact that the requested forensic analysis may not produce the
    desired evidence, but such a consequence should not be an
    impediment to analysis in the first instance.    Given its
    compelling interest in remedying wrongful convictions of
    factually innocent persons, the Legislature intended to permit
    access to DNA testing "regardless of the presence of
    overwhelming evidence of guilt in the underlying trial."     Wade,
    467 Mass. at 511.   As such, it is entirely appropriate that we
    construe the language of G. L. c. 278A, § 7 (b), in a manner
    that is generous to the moving party.
    We conclude that the judge erred in determining that Clark
    failed to satisfy his burden of demonstrating the requirements
    of G. L. c. 278A, § 7 (b) (1) and (4).    Based on his decision
    regarding these two statutory provisions, the judge did not
    consider the remaining criteria of § 7 (b).     See note 5, supra.
    Pursuant to § 7 (a), a judge "shall state findings of fact and
    conclusions of law on the record, or shall make written findings
    of fact and conclusions of law that support the decision to
    29
    allow or deny a motion brought under [§] 3."18   See Wade, 467
    Mass. at 503.   We have no such findings and conclusions
    concerning whether Clark satisfied his burden of proof with
    respect to § 7 (b) (2), (3), (5), and (6).   Mindful of our
    rationale for analyzing the criteria set forth in G. L. c. 278,
    § 3, we similarly could consider whether Clark satisfied those
    particular requirements of § 7 (b) that can be demonstrated
    through documentary materials.   See, e.g., G. L. c. 278A,
    § 7 (b) (3), (5), (6).   However, the matter of whether Clark
    satisfied § 7 (b) (2) stands on different footing.   A dispute
    exists between the parties as to whether "the evidence or
    biological material has been subject to a chain of custody that
    is sufficient to establish that it has not deteriorated, been
    substituted, tampered with, replaced, handled or altered such
    that the results of the requested analysis would lack any
    probative value," § 7 (b) (2), and the judge made no findings to
    18
    As we have stated, a judge shall allow forensic or
    scientific analysis only in those cases where a moving party has
    demonstrated, by a preponderance of the evidence, all six
    criteria set forth in G. L. c. 278A, § 7 (b). We recognize that
    where a judge determines that a moving party has failed to
    satisfy one of these criteria, the language of § 7 (a) could be
    construed as only requiring findings of fact and conclusions of
    law relating to that one criterion. In our view, however,
    § 7 (a) is better read as requiring a judge to articulate
    findings of fact and conclusions of law on all six criteria in
    every decision made on a motion filed pursuant to G. L. c. 278A.
    By so doing, a judge will facilitate proper appellate review,
    when sought, without the necessity of a remand for further
    proceedings, thereby promoting judicial economy and efficiency.
    30
    resolve the dispute.   He simply did not consider whether DNA
    analysis of the knife handle "would lack any probative value"
    due to deterioration or handling of the evidence over time
    (emphasis added).    G. L. c. 278A, § 7 (b) (2).   We have said
    that "[a]ppellate courts may supplement a judge's finding of
    facts if the evidence is uncontroverted and undisputed and where
    the judge explicitly or implicitly credited the witness's
    testimony."   Commonwealth v. Isaiah I., 
    448 Mass. 334
    , 337
    (2007), S.C., 
    450 Mass. 818
     (2008).   However, that is not the
    situation presented here.   Accordingly, we remand this matter to
    the Superior Court for the requisite findings of fact and
    conclusions of law regarding whether Clark has demonstrated by a
    preponderance of the evidence the requirements of § 7 (b) (2),
    (3), (5), and (6).
    4.   Discovery under G. L. c. 278A.    Finally, we consider
    whether the judge properly denied Clark's request for discovery
    regarding a pair of men's socks.   Clark contends that, contrary
    to the judge's conclusion, he was not required to demonstrate
    either that there was a causal connection between the socks and
    the assailant, or that such evidence would be exculpatory.     He
    further contends that the judge improperly and prematurely
    analyzed his request for discovery under G. L. c. 278A, § 7,
    rather than under G. L. c. 278A, § 3.   In Clark's view, the
    allowance of discovery pertaining to the socks is necessary
    31
    before he can satisfy any burden of proof as to their
    evidentiary value.
    General Laws c. 278A, § 3 (c), provides that if, at this
    threshold stage, a moving party is unable to file with the
    motion "any of the items or information" required under § 3 (b),
    or "lacks items or information necessary to establish any of the
    factors" set forth in § 7 (b), then the moving party may seek
    "discovery of such items or information from the prosecuting
    attorney or any third party" and "shall include a description of
    efforts made to obtain such items and information."   See Wade,
    467 Mass. at 504.    Here, Clark stated in his § 3 motion that
    Detective Farrell recovered from the victim's apartment a pair
    of men's socks.   He further stated that the current location of
    the socks was unclear, and that he was entitled to discovery to
    ascertain their location and then pursue DNA testing.    Because
    Clark failed to describe in his § 3 motion any efforts that he
    made to obtain the socks, we conclude that Clark did not meet
    the requirements of § 3 (c).
    Had he done so, then the judge would have considered
    whether to authorize discovery pursuant to § 7 (c).     "Such
    discovery may include items and biological materials from third
    parties, provided the party seeking discovery demonstrates that
    analysis of these items or biological material will, by a
    preponderance of the evidence, provide evidence material to the
    32
    identification of a perpetrator of the crime."     G. L. c. 278A,
    § 7 (c).    Further, if a judge finds "good cause" for a moving
    party's "inability to obtain items or information required
    under" §§ 3 (b) and 7 (b), then the judge can "order discovery
    to assist the moving party in identifying the location and
    condition of evidence or biological material that was obtained
    in relation to the underlying case, regardless of whether it was
    introduced at trial or would be admissible."     Id.   Here, in his
    memorandum of decision, the judge stated that the testimony of
    Detective Farrell, by itself, was insufficient to show that
    there was a connection between the socks and the perpetrator,
    much less that the evidence had the potential to exculpate
    Clark.     The judge pointed out that the record did not indicate
    that the socks once belonged to, or were ever touched by, the
    victim's assailant.     Consequently, the judge concluded that
    Clark failed to satisfy his burden of demonstrating that
    searching for and analyzing the socks would provide evidence
    material to the identification of the perpetrator of the
    underlying crimes.     We do not disagree with the judge's
    conclusion.     Clark's request for discovery pertaining to the
    socks was properly denied.19
    19
    In the event that Clark obtains new information about the
    location and evidentiary significance of the socks, he is not
    foreclosed from filing another motion for discovery pursuant to
    the terms of G. L. c. 278A, § 3 (c).
    33
    5.   Conclusion.   The judge's order denying Clark's § 3
    motion is reversed, except insofar as it denied Clark's request
    for discovery.   We remand this case to the Superior Court for
    further proceedings consistent with this opinion.
    So ordered.