Antwan Buchanan v. United States ( 2017 )


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    DISTRICT OF COLUMBIA COURT OF APPEALS
    No. 15-CM-356
    ANTWAN BUCHANAN, APPELLANT,
    V.
    UNITED STATES, APPELLEE.
    Appeal from the Superior Court
    of the District of Columbia
    (CMD-13296-14)
    (Hon. William M. Jackson, Trial Judge)
    (Argued December 15, 2016                                 Decided August 3, 2017)
    Donald Burke, with whom Matthew M. Madden was on the brief, for
    appellant.
    Priya Naik, Assistant United States Attorney, for appellee. Channing D.
    Phillips, United States Attorney, and Elizabeth Trosman, Kathleen A. Kern, and
    Melissa M. Price, Assistant United States Attorneys, were on the brief for appellee.
    Before THOMPSON and MCLEESE, Associate Judges, and FERREN, Senior
    Judge.
    THOMPSON, Associate Judge:       Appellant, Antwan Buchanan, was arrested
    after police officers saw him drop a duffle bag and another grocery-type bag as he
    was fleeing from police officers who had asked to speak with him. When officers
    retrieved and searched the bags, they found 7.5 ounces of a plant-like substance
    2
    they believed to be marijuana, two scales, over 200 empty zip-lock bags, sandwich
    bags, a nail file, and a plastic lid. The plant-like substance, which was contained in
    one small and two large zip-lock bags and which field-tested positive for THC, 1
    was sent to a Drug Enforcement Administration (―DEA‖) laboratory for testing.
    On this evidence, the government charged appellant with possession with intent to
    distribute a controlled substance (marijuana), see D.C. Code § 48-904.01 (a)(1)
    (2012 Repl.), and possession of drug paraphernalia, see D.C. Code § 48-1103 (a)
    (2012 Repl.). After a bench trial, he was convicted of both offenses.
    Prior to trial, appellant sought discovery under the rule now codified as
    Super. Ct. Crim. R. 16 (a)(1)(E) (―Rule 16 (a)(1)(E)‖).2 The Superior Court judge,
    the Honorable William M. Jackson, compelled the government to produce
    documents in response to some of appellant‘s discovery requests but denied
    appellant‘s motion to compel production in response to other requests. In this
    appeal, appellant argues that the court erred in certain of its rulings denying his
    discovery requests.    He asks us to require the government to produce the
    1
    THC ―is the active ingredient in marijuana.‖ Lesher v. United States, 
    149 A.3d 519
    , 522 (D.C. 2016) (internal quotation marks omitted).
    2
    An April 2016 amendment to the Superior Court Rules of Criminal
    Procedure moved the provision formerly contained in Rule 16 (a)(1)(C) to Rule 16
    (a)(1)(E) but made no substantive change to the content of the rule. In this
    opinion, we cite to the current codification.
    3
    documents in question and to remand for the trial court to review the documents
    and determine whether appellant was prejudiced by the non-disclosure.               We
    conclude that appellant is entitled to this relief with respect to some of the
    categories of documents in question and, as to other categories, is at least entitled
    to have the trial court reconsider the requests in light of ―all relevant factors and no
    improper factor.‖3
    I.
    DEA senior forensic chemist Nicole Edwards performed the chemical
    analysis of the plant-like substance. In his initial discovery requests, appellant
    sought ―the complete case file of the chemist who was responsible for testing the
    suspected marijuana recovered in this case.‖ The government provided Edwards‘s
    case file to appellant on November 8, 2014, ten days prior to the scheduled trial
    date. The documents produced included, inter alia, the chemical analysis report
    (DEA-113) and the forensic chemist worksheet (DEA-86), as well as ―bench notes,
    memoranda, evidence reports, chain of custody reports (DEA-12), negative and
    positive control data, chrom[a]tographs, mass spectra, photographs of [the]
    3
    In re R.M.G., 
    454 A.2d 776
    , 790 (D.C. 1982) (citing Johnson v. United
    States, 
    398 A.2d 354
    , 365 (D.C. 1979)).
    4
    evidence, and the results of any color tests and microchemical crystal tests.‖ The
    government also produced information about the make and model of the equipment
    used to test the substance and the ―scope of accreditation‖ document for the DEA
    laboratory. Upon receipt of this information, appellant moved to continue the trial
    date in order to confer with his own expert chemist. Judge Jackson set a new trial
    date.
    On December 16, 2014, appellant moved to compel the production of
    additional documents he had requested. As pertinent here, he sought to compel the
    government to produce (1) ―the standard operating procedures [(―SOPs‖)] used in
    the DEA lab,‖ (2) ―validation studies relating to those procedures,‖ (3)
    ―maintenance and calibration records for the equipment used by the DEA lab,‖ (4)
    ―audit reports on the operations of the DEA lab,‖ (5) ―training materials used by
    the lab,‖ and (6) ―proficiency examinations and performance evaluations for the
    chemist who had tested the suspected marijuana.‖       In support of his request,
    appellant submitted the affidavit of Heather Harris, a ―forensic chemistry
    consultant and adjunct professor of forensic science employed by Arcadia
    University in Glenside[,] [Pennsylvania].‖    Harris averred that she needed to
    review the documents appellant sought ―to ensure that the [DEA] analyst came to
    the proper conclusion [regarding the evidence] and that the conclusion is
    5
    scientifically supported by the analytical results‖ and asserted that it was
    ―impossible to evaluate the validity and reliability of [the DEA] analysis without
    this documentation.‖
    In its written opposition to appellant‘s motion, the government agreed to
    provide ―the DEA Laboratory Order regarding the Analyses of MPDC Evidence
    (DEA-42)‖ (the ―Laboratory Order‖) on condition that appellant sign a non-
    disclosure agreement.   The government rejected appellant‘s requests for other
    documents on grounds that their acquisition was unduly burdensome or beyond the
    reach of Rule 16 (a)(1)(E). Appellant filed a reply memorandum in support of his
    motion to compel, to which he attached a second affidavit from Harris.
    In a written ruling dated February 27, 2015, Judge Jackson said that the
    government would be required to produce the DEA laboratory SOPs ―[t]o the
    extent that the DEA Laboratory Order does not encompass DEA‘s standard
    procedures and guidelines for testing marijuana,‖ as well as the DEA laboratory
    accreditation reports ―[t]o the extent that the [DEA laboratory‘s] accreditation is
    not publicly available.‖   Judge Jackson rejected appellant‘s requests for the
    remaining documents.
    6
    Upon the judge‘s ruling, appellant filed a second motion to compel, arguing
    that the government had failed to comply with the court order requiring the
    government‘s disclosure of the DEA‘s SOPs. The motion was accompanied by a
    third affidavit from Harris. Judge Jackson denied the motion from the bench,
    reasoning that appellant would be able to call the chemist as a fact witness about
    the laboratory‘s operating procedures.
    The case proceeded to trial on March 30, 2015.         The government had
    Edwards available to testify in its case-in-chief, but before she took the stand,
    appellant‘s trial counsel ―stipulated to the admissibility of the DEA-7 and the
    findings that have been made within.‖ Accordingly, Edwards did not testify at trial
    (and thus was not cross-examined). The DEA-7 that was admitted into evidence
    revealed that Edwards had weighed the plant-like substance and performed three
    different types of tests — a microscopic inspection, a gas chromatography/mass
    spectrometry (―GC/MS‖) test, and a Duquenois-Levine (―D-L‖) color test — to
    determine whether the substance was marijuana. Her report indicated that all three
    tests were positive, leading Edwards to conclude that the sample ―contained ‗a
    measurable amount of [m]arijuana.‘‖
    7
    In addition to the DEA-7, the government‘s evidence at trial included the
    testimony of a police detective to the effect that the amount of marijuana found in
    the bags appellant discarded was consistent with intent to distribute and
    inconsistent with possession for personal use. The detective also testified that the
    scale, nail file, small zip-lock bags, and other items found in the bag are tools
    commonly used to separate and package drugs for distribution.
    II.
    Appellant now challenges the trial court‘s denial of his motion to compel
    production of the six categories of withheld documents described above. Relying
    on Rule 16 (a)(1)(E), appellant argues that the trial court erred by denying his
    discovery requests where they ―were supported by unrebutted expert affidavits
    specifically identifying the potential for error in the testing methods employed by
    the government‘s chemist, the defense‘s need for the requested information, and
    the absence of any likely burden on the government.‖ 4 The government argues that
    4
    Appellant argues that ―[t]he appropriateness of [his] discovery requests‖
    is ―underscored by the rules governing the [District of Columbia] Consolidated
    Forensic Laboratory, which would make most of what [he] sought in this case
    either a public record or subject to automatic disclosure if the testing at issue in this
    case had been conducted‖ at that laboratory. He cites D.C. Code § 5-1501.06
    (h)(2) (2012 Repl.), providing that the defense will receive a copy of ―records,‖
    (continued…)
    8
    appellant is not entitled to the relief he requests because he (1) failed to establish
    that the materials in dispute were material to his defense, (2) stipulated to the
    analysis and findings of the DEA chemist and thus forwent opportunities to
    challenge the government‘s forensic evidence at trial, (3) declined to call his expert
    to testify about the alleged errors committed by the DEA chemist, and (4) failed to
    demonstrate that he was prejudiced by the court‘s denial of his requests.
    ―We review the trial court‘s discovery rulings for abuse of discretion, but we
    consider the proper construction of [Rule 16 (a)(1)(E)] de novo.‖ Watson v. United
    States, 
    43 A.3d 276
    , 283 (D.C. 2012) (citations omitted). If we conclude that the
    trial court erred or erroneously exercised its discretion in not compelling the
    requested document production under Rule 16, we must ―turn to the more difficult
    (…continued)
    defined to include, inter alia, ―[a]ny logs related to the equipment or materials used
    in testing‖ and ―[p]roficiency test results for individual examiners involved in the
    analysis.‖ 
    Id. § 5-150l.06
    (h)(3)(G), (I). He cites in addition § 5-150l.06 (i)(2),
    which declares to be ―public‖ a set of materials that include the laboratory‘s
    ―[p]rotocols for forensic testing, examination, and analysis[,]‖ its ―[p]rocedures for
    monitoring the quality of forensic analysis[,]‖ and its ―[i]nternal validation
    studies.‖ 
    Id. § 5-1501.04
    (b)(l), (5), (9). Appellant acknowledges that these rules
    are not binding on the DEA, but argues that they reflect the judgment of the
    Council of the District of Columbia ―that criminal defendants should have broad
    access to information about potential sources of error in the forensic evidence the
    government seeks to offer against them[.]‖ These rules may also be germane to
    whether producing such records in discovery is unduly burdensome.
    9
    questions as to whether [appellant] was prejudiced by the government‘s failure to
    comply with Rule 16, [and] whether that failure warrants reversal of [his]
    convictions and a new trial.‖ Ferguson v. United States, 
    866 A.2d 54
    , 65 (D.C.
    2005).
    ―Rule 16 [(a)(1)(E)], which governs pretrial discovery, confers [on] an
    accused the right to discover specific information within the government‘s control,
    such as books, papers, documents, photographs . . . which are material to the
    preparation of the defendant’s defense . . . .‖ 
    Watson, 43 A.3d at 283
    (emphasis
    added) (internal quotation marks omitted). To establish that the documents are
    material, a defendant must show ―a relationship between the requested evidence
    and the issues in the case, and there must exist a reasonable indication that the
    requested evidence will either lead to other admissible evidence, assist the
    defendant in the preparation of witnesses or in corroborating testimony, or be
    useful as impeachment or rebuttal evidence.‖ United States v. Curtis, 
    755 A.2d 1011
    , 1014–15 (D.C. 2000). ―A defendant must make a threshold showing of
    materiality, which requires a presentation of facts which would tend to show that
    the [g]overnment is in possession of information helpful to the defense.‖ 
    Id. at 1015
    (internal quotation marks omitted). ―The threshold showing of materiality is
    not a high one.‖ 
    Id. ―However, neither
    a general description of the information
    10
    sought nor conclusory allegations of materiality suffice.‖ 
    Id. (internal quotation
    marks and brackets omitted). Federal courts have held that the defense ―must
    show more than that the item bears some abstract logical relationship to the issues
    in the case . . . . There must be some indication that the pretrial disclosure of the
    item would . . . enable the defendant significantly to alter the quantum of proof in
    his favor[,]‖ United States v. Jordan, 
    316 F.3d 1215
    , 1251 (11th Cir. 2003)
    (internal quotation marks and brackets omitted), and that ―the requested discovery
    [must have] relevance to . . . the defendant[’s] particular case.‖ United States v.
    Soto-Zuniga, 
    837 F.3d 992
    , 1001 (9th Cir. 2016) (emphasis added); see also 
    id. at 1003
    (explaining that the test is ―whether the discovery may assist [the defendant]
    in formulating a defense‖).5 Documents that ―refute the [g]overnment‘s arguments
    that the defendant committed the crime charged‖ fall squarely within the Rule.
    United States v. Armstrong, 
    517 U.S. 456
    , 462 (1996). A defendant‘s ―request for
    discovery materials must be reasonable and may not unduly burden the
    government.‖ 
    Curtis, 755 A.2d at 1016
    (citing Wiggins v. United States, 
    521 A.2d 1146
    , 1148 (D.C. 1987)).
    5
    ―Because [Super. Ct. Crim. R.] 16 is substantially the same as its federal
    counterpart . . . , it is to be construed consistently with the federal rule[,] and we
    may look to relevant federal precedents for guidance.‖ 
    Curtis, 755 A.2d at 1014
    (internal quotation marks omitted).
    11
    In Curtis, the government appealed after the Superior Court granted a
    motion to dismiss the case for the government‘s failure to turn over information
    regarding the ―maintenance and repair of instruments used, as well as reports,
    training materials, and written protocols and procedures relating to the testing of
    controlled substances that were generated or in use from the time the DEA Lab
    received the evidence in th[e] case to the time when the analysis was 
    completed.‖ 755 A.2d at 1013
    . In opposing the defendants‘ motion to compel, the government
    had submitted evidence ―that the DEA Lab equipment would not give false
    positive results even if the equipment were not maintained properly.‖ 
    Id. at 1015
    .
    We reversed (and remanded because the trial court had made no specific findings
    regarding materiality or burdensomeness), 
    id. at 1017–18,
    but observed that
    contradictory ―information that the failure to properly maintain the lab equipment
    could lead to inaccurate test results, including false positives, would make the
    maintenance logs material.‖    
    Id. at 1015
    n.8. ―Similarly,‖ we observed, ―the
    submission of an affidavit from a qualified chemist that he or she noted a possible
    flaw in the testing procedures used by the DEA chemist . . . would satisfy the
    threshold showing of materiality . . . for copies of the training materials and
    protocols and procedures utilized by the DEA.‖ 
    Id. We left
    it ―to the discretion of
    the trial court to determine what type of threshold showing [was] appropriate‖ to
    demonstrate materiality but instructed that the defendants ―must make some
    12
    preliminary showing of a reason to doubt the chemical analysis provided by the
    government‖ and of ―some link to a material issue in the case.‖ 
    Id. at 1015
    .
    In Jackson v. United States, 
    768 A.2d 580
    (D.C. 2001), we reasoned that
    ―[m]ateriality is easily demonstrated‖ where the government has yet to produce a
    ―detailed description of the tests performed‖ by the DEA, ―broken down to
    include, among other things, the evidence sampling procedures, qualitative
    analysis, and quantitation, with the latter differentiated by method [number] and
    various weight classifications.‖ 
    Id. at 583
    (internal quotation marks omitted). We
    explained, however, that where the government has already produced reports on
    the results of scientific tests done on suspected controlled substances submitted to
    the DEA for analysis, and where the defense is ―demanding still additional
    background documents related to DEA testing‖ through a ―broad request‖ that
    amounts to ―a fishing expedition,‖ the Curtis ―reason to doubt‖ standard applies,
    and ―the defense w[ill] have to furnish information by affidavit or otherwise
    contradicting or calling in question the documentation already disclosed before
    further intrusion into DEA‘s internal processes w[ill] be sanctioned.‖ 
    Id. at 583
    &
    n.2 (emphasis, brackets, and internal quotation marks omitted).
    13
    In determining whether a defendant was prejudiced by the denial of a motion
    to compel the government to produce documents, we must determine the
    ―likelihood that the verdict would have been different had the government
    complied with the discovery rules or whether the remedy offered by the trial court
    was inadequate to provide [appellant] with a fair trial.‖ 
    Ferguson, 866 A.2d at 65
    (internal quotation marks, citation, and brackets omitted).     Where we cannot
    determine the likelihood that the case would have had a different outcome with the
    requested discovery, the proper course is a record remand ―for consideration of the
    issue by the trial judge . . . , who may make the necessary comparison and transmit
    [his] findings to us.‖ 
    Jackson, 768 A.2d at 584
    (citing Davis v. United States, 
    564 A.2d 31
    , 42 (D.C. 1989) (en banc) (Where this court has ―an incomplete record
    upon which to assess harmlessness,‖ remand is appropriate for the trial court ―to
    make the proper evidentiary record and return the matter to this court.‖)); see also
    
    Soto-Zuniga, 837 F.3d at 1002
    (―[B]ecause we do not have access to the records in
    question, we cannot determine the likelihood of whether [the] case would have had
    a different outcome had [the defendant] been permitted discovery. The proper
    course under such circumstances is to remand for discovery and an evidentiary
    determination.‖ (citation omitted)).
    14
    III.
    We now consider in turn each of the categories of documents whose
    production by the government the trial court declined to compel.
    1. The DEA laboratory‘s standard operating procedures. The first is ―the
    standard operating procedures used in the DEA lab.‖        The court ordered the
    government to produce the SOPs if they were not ―encompass[ed]‖ in the
    Laboratory Order. After the government produced the Laboratory Order, defense
    counsel attempted to explain that the condition the court had established was not
    satisfied, but, after a brief discussion, the court firmly shut down counsel‘s
    argument (saying ―[n]ext issue‖), apparently without having carefully reviewed the
    Laboratory Order to ascertain whether it included ―a list of standard operating
    procedures.‖ Harris‘s third affidavit had explained that the Laboratory Order set
    out only ―general guidance for completing a case‖ and did not satisfy the request
    for the DEA laboratory‘s SOPs because it did not provide ―the technical
    information that is required to replicate the [DEA] testing‖ and ―to fully
    understand the limitations of the testing.‖6 In addition, defense counsel drew the
    6
    The Laboratory Order addresses, inter alia, procedures for receiving a
    suspected substance from and returning it to the MPD, the proper handling of that
    (continued…)
    15
    court‘s attention to the government‘s transmittal letter attaching the Laboratory
    Order, but ―declin[ing] to provide . . . the [SOPs]‖ (thus, at least arguably,
    implicitly acknowledging that the content of the two was not identical). The trial
    court told counsel that the defense could ―call [Harris] . . . as a fact witness to say
    this is not a standard operating procedure,‖ but that rationale for resolving the issue
    without further examination overlooked that Rule 16 discovery is to be available
    for use by the defense ―as impeachment . . . evidence,‖ 
    Curtis, 755 A.2d at 1015
    —
    here, evidence with which appellant might impeach the DEA chemist.7
    Although highlighting appellant‘s representation that Harris would not
    attempt to replicate the DEA testing ―because she no longer worked at a
    laboratory,‖ the government has not disputed Harris‘s assertion that she needed to
    review the SOPs to understand the ―limitations of the [DEA] testing.‖ Nor has the
    (…continued)
    substance if it comes in numerous containers, and the method for determining the
    weight of the substance, but does not describe the DEA‘s standard procedures for
    determining whether the substance is marijuana.
    7
    Cf. Cole v. State, 
    835 A.2d 600
    , 609–10 (Md. 2003) (―If the testimony,
    however, revealed that the standard operating procedures were not followed, that
    might be exculpatory evidence which, when brought out in cross-examination,
    could make a meaningful difference to a fact-finder.‖).
    16
    government asserted that production of the SOPs would be burdensome. 8
    Accordingly, we agree with appellant that the trial court erroneously exercised its
    discretion in declining to enforce its order requiring the government to produce
    documentation ―encompass[ing]‖ the SOPs without a more careful consideration of
    what, if any, material information its ruling made inaccessible to the defense. 9
    8
    Harris‘s affidavit averred (and the government does not dispute) that the
    burden associated with producing all of the requested documents is minimal,
    stating that ―[a]ll of this documentation is produced in the normal course of
    business for a forensic laboratory so the burden of this request is limited to the
    collection of the relevant documents.‖
    9
    The government urges us to follow ―numerous other courts across the
    country [that] have held that DEA procedures and manuals are not discoverable
    under federal Rule 16.‖ However, the appellate cases the government cites upheld
    the denial of discovery under the rule currently codified as Rule 16 (a)(1)(F),
    which pertains to ―Reports of Examinations and Tests.‖ The cases did not hold
    that production of such documents was not mandated under the rule currently
    codified as Rule 16 (a)(1)(E) — the rule that governs the instant case. See, e.g.,
    United States v. Price, 
    75 F.3d 1440
    , 1445 (10th Cir. 1996) (noting that ―Price
    relied almost exclusively on [the rule currently codified as Fed. R. Crim. P. 16
    (a)(1)(F)]‖ and that ―[t]he references in Price‘s motions to [other]
    subparagraphs . . . of Rule 16 (a)(1) were entirely without detail, and . . . provided
    no further basis for a ruling‖); United States v. Iglesias, 
    881 F.2d 1519
    , 1521,
    1523–24 (9th Cir. 1989) (DEA protocols and the DEA chemist‘s ―log notes‖ were
    not discoverable under the rule currently codified as Fed. R. Crim. P. 16
    (a)(1)(F).); United States v. Berry, 
    670 F.2d 583
    , 605 (5th Cir. 1982) (applying the
    paragraph of Fed. R. Crim. P. 16 pertaining to the ―results or reports of . . . any
    scientific test‖ (currently codified as Rule 16 (a)(1)(F)) and concluding that the
    DEA chemist‘s personal work notes and the ―Drug Enforcement Administration
    Analytical Manual‖ were irrelevant); United States v. Orzechowski, 
    547 F.2d 978
    ,
    984 (7th Cir. 1976) (rejecting the claim that certain DEA internal memoranda were
    research reports that fell within the rule currently codified as Rule 16 (a)(1)(F)).
    These cases reflect the intent of the Rule 16 Advisory Committee that ―[w]ith
    (continued…)
    17
    2. The other categories of documents. In pressing his claim of trial-court
    error with respect to the other categories of documents whose production the trial
    court declined to order, appellant relies on Harris‘s first and second affidavits, in
    which she ―noted a possible flaw in the testing procedures used by the DEA
    chemist.‖ 
    Curtis, 755 A.2d at 1015
    n.8. Specifically, Harris averred that the DEA
    chemist ―used the remaining portion of another test sample‖ to perform the D-L
    test and opined that ―[t]his is not proper scientific practice and could result in
    contamination of the sample prior to the D-L test.‖ Harris also averred that sample
    contamination ―can lead to false positive results.‖ The government asserts that
    appellant did not meet his burden of making a ―prima facie showing of materiality‖
    (…continued)
    respect to results or reports of scientific tests or experiments[,] the range of
    materials which must be produced by the government is further limited to those
    made in connection with the particular case.‖ Fed. R. Crim. P. 16 advisory
    committee‘s note to 1966 amendment.
    Notably, in Curtis, this court agreed that documents concerning the
    maintenance of DEA laboratory equipment and training manuals do not fall under
    the rule currently codified as Rule 16 (a)(1)(F), because ―they are neither reports of
    scientific tests or experiments,‖ but we remanded for further proceedings because
    the trial court ―made no specific findings regarding the materiality of the
    [requested documents]‖ under the rule currently codified as Rule 16 
    (a)(1)(E). 755 A.2d at 1017
    –18. As discussed above, Curtis establishes that where the defendant
    has produced an ―affidavit from a qualified chemist that he or she noted a possible
    flaw in the testing procedures used by the DEA chemist[,] . . . [such] would satisfy
    the threshold showing of materiality with respect to . . . protocols and procedures
    utilized by the DEA,‖ so as to require production under Rule 16 (a)(1)(E). 
    Id. at 1015
    n.8.
    18
    because his expert Harris ―neither cited to a document where such an error was
    discernible nor . . . explain[ed] how she deduced that such an error occurred‖ and
    ―did not explain how the use of the same sample to conduct a color test after that
    sample was viewed under a microscope would undermine the chemist‘s
    conclusion.‖ The government provided no evidence to counter Harris‘s claim
    about the DEA chemist using ―the remaining portion of another test sample,‖ but
    argues that Harris‘s affidavit did nothing more than make ―conclusory arguments
    that scientific methods are not infallible‖ and that ―laboratory equipment is capable
    of failing,‖ which do not meet the Curtis standard.         
    See 755 A.2d at 1015
    (―[C]onclusory allegations of materiality [do not] suffice.‖ (internal quotation
    marks omitted)).
    a. Training materials. The government‘s ―conclusory arguments‖ response
    as to the other categories of documents is too general. We conclude that appellant
    did meet his burden under Curtis of establishing materiality with respect to the
    requested ―training materials used by the [DEA] lab.‖10 We said in Curtis ―the
    10
    The trial court declined to order production of the training materials in a
    single sentence: ―The Court denies defendant‘s request for training materials.‖
    We are unable to discern why the court so ruled. ―[A] trial court‘s action is an
    abuse of discretion if . . . [it does] not rest upon a specific factual predicate.‖
    
    Johnson, 398 A.2d at 364
    (citation omitted).
    19
    submission of an affidavit from a qualified chemist that . . . she noted a possible
    flaw in the testing procedures used by the DEA chemist . . . would satisfy the
    threshold showing of materiality . . . for copies of . . . training materials and
    protocols and procedures utilized by the DEA.‖ 
    Id. at 1015
    n.8 (emphasis added).
    We did not say that the burden of establishing materiality with respect to such
    documents could be met only if the qualified chemist said enough about the
    particular ―possible flaw‖ to establish a prima facie case that the test results were
    unreliable, or said enough to prove under some standard that the alleged ―possible
    flaw‖ in the testing procedures used was indeed a flaw. It is enough that the
    identified ―possible flaw,‖ 
    id., ―call[ed] into
    question‖ the government‘s evidence
    (here, the DEA-7 report concluding that the plant-like substance was marijuana) on
    an issue in the case. 
    Id. at 1014,
    1015 n.8; 
    Jackson, 768 A.2d at 583
    n.2.11 For this
    reason, we agree that the trial court erred in not requiring the government to
    produce copies of the training materials used by the DEA laboratory. 12
    11
    See also United States v. Simpson, 
    845 F.3d 1039
    , 1056 (10th Cir. 2017)
    (concluding that the defendant, who was seeking to suppress the results of a search
    warrant, did not meet his burden of making ―a prima facie showing of materiality‖
    with respect to his discovery request for camera footage that might show that a
    police informant had lied, because ―to justify suppression, [the defendant] needed
    to attack the veracity of the police affiant, not the informant‖).
    12
    Cf. United States v. Thomas, 
    726 F.3d 1086
    , 1096 (9th Cir. 2013)
    (explaining that the government was compelled under Rule 16 (a)(1)(E) to disclose
    ―the handler‘s log, . . . training records and score sheets, certification records, and
    (continued…)
    20
    b. Validation studies. The trial court assumed that appellant‘s request for
    ―validation studies relating to‖ the DEA laboratory‘s SOPs — a request that the
    court characterized as ―less than crystal clear‖ — was a request for ―studies
    validating the methods used in the type of drug testing in this case.‖ The court
    declined to compel production of such items on the ground that Harris‘s affidavit
    did ―not call into question the DEA‘s methods, nor [did] it assert that these
    methods are different from those widely accepted in the scientific community.‖
    We agree with the trial court that precisely what appellant sought through
    his reference to ―validation studies‖ was less than clear at the time of the court‘s
    February 27, 2015, ruling. However, although Harris‘s third affidavit attempted to
    elucidate the request,13 the court did not revisit the issue after receiving that
    (…continued)
    training standards and manuals pertaining to [a narcotics-detection] dog,‖ because
    those materials were ―crucial to the defendant‘s ability to assess the dog‘s
    reliability, a very important issue in his defense, and to conduct an effective cross-
    examination of the dog‘s handler‖ (internal quotation marks and brackets
    omitted)).
    13
    Harris explained that ―[a] request for validation studies is a request for
    the proof that the laboratory‘s analytical tests can perform reliably and generate
    accurate results‖; that ―[v]alidation is how the laboratory proves that it is running
    the tests properly and can generate correct results in its unique environment, on its
    unique equipment, with its unique people and its specific procedures‖; and that
    (continued…)
    21
    additional information. Further, while Harris ―agree[d] with the government that
    the general techniques that are being used in the DEA Mid-Atlantic laboratory are
    generally accepted in the community,‖ she averred that ―[g]eneral acceptance does
    not prove that DEA Mid-Atlantic is using those techniques accurately and
    reliably.‖ The trial court did not appear to consider Harris‘s explanation about the
    importance of reliable application of generally accepted methods.14 For these
    reasons, we are not satisfied that the trial court properly exercised its discretion
    when it declined to compel the government to produce the requested validation
    studies. See 
    Johnson, 398 A.2d at 365
    (―To exercise its judgment in a rational and
    informed manner[,] the trial court should be apprised of all relevant factors
    pertaining to the pending decision[,]‖ and ―[t]he court reviewing the decision for
    an abuse of discretion must determine whether the decision maker failed to
    consider a relevant factor[.]‖ (internal quotation marks omitted)). We conclude
    (…continued)
    ―[v]alidation is a series of experiments run in the laboratory to challenge the tests
    and to determine its limitations.‖ Harris also averred that the ―DEA, through its
    scientific working group SWGDRUG, has written a comprehensive guide to
    validation.‖
    14
    See Motorola Inc. v. Murray, 
    147 A.3d 751
    , 757 & n.8 (D.C. 2016) (en
    banc) (adopting Fed. R. Evid. 702 (d), which ―expressly requires the court to
    determine whether [an] expert has reliably applied [accepted] principles and
    methods to the facts of the case‖ (internal quotation marks omitted)).
    22
    that a remand is required for the court to consider this category of documents more
    fully.
    c. Maintenance and calibration records. We next consider appellant‘s claim
    that the trial court erred in not compelling the government to produce
    ―maintenance and calibration records for the equipment used by the DEA lab.‖
    The trial court ruled that ―[a]bsent a good-faith assertion of an equipment defect,
    defendant‘s request for calibration checks is overly broad and, therefore[,] denied.‖
    As to the request for maintenance information, the trial court denied the request ―as
    unduly burdensome‖ and noted that the government was obligated under Brady v.
    Maryland, 
    373 U.S. 83
    (1963), ―to furnish defendant with information regarding
    problems with the equipment employed here.‖ Harris‘s third affidavit averred that
    ―[e]very time a GC/MS is used for casework, a tune and calibration must be
    performed to allow the instrument to ‗calibrate‘ and then to provide an assessment
    of the state of the instrument prior to running unknown samples.‖ She added that
    ―maintenance and calibration logs . . . should detail the performance of the
    instrument and the laboratory‘s adherence to a maintenance procedure.‖ In her
    second affidavit, however, Harris averred that ―[w]ith regard to the GC/MS, which
    is identifying THC rather than marijuana, false positives are rare due to the unique
    23
    action of the mass spectrometer‖ (although ―[s]ample contamination and
    misinterpretation of data . . . can lead to false positive results‖).
    On this record — Harris‘s statement about maintenance and calibration only
    with respect to the GC/MS equipment — we must agree that appellant‘s request to
    compel production of ―maintenance and calibration records for the equipment used
    by the DEA lab‖ (without restriction as to time period or as to type of equipment)
    was overly broad. Further, as Harris did not state that failure to calibrate the
    GC/MS equipment could lead to a false positive identification of marijuana, it is
    not apparent from the record that the documents sought were relevant to whether
    appellant ―committed the crime charged,‖ 
    Armstrong, 517 U.S. at 462
    , or that they
    would have enabled appellant ―significantly to alter the quantum of proof in his
    favor.‖     
    Jordan, 316 F.3d at 1251
    .15 Nevertheless, the trial court‘s reasons for
    15
    Quoting the Court of Appeals of Maryland‘s opinion in Cole, appellant
    argues that it is enough that the requested calibration records are ―potentially
    relevant to the case because an improperly calibrated machine . . . could lead to an
    inaccurate 
    result.‖ 835 A.2d at 614
    . Our case law does not allow this approach in
    light of the record of government document production in this case. See 
    Jackson, 768 A.2d at 584
    & n.2 (acknowledging that Rule 16 ―looks only to the potential
    value of the evidence to competent defense counsel,‖ but explaining that the
    ―higher‖ materiality standard established by Curtis applies where the government
    has already produced documents showing the ―underlying spectral analysis of the
    drugs‖ and describing the DEA‘s ―test procedures and equipment,‖ and the defense
    nonetheless is ―demanding still additional background documents related to DEA
    testing‖ (internal quotation marks and brackets omitted)). We also note that Cole
    (continued…)
    24
    denying the motion to compel the production of maintenance and calibration
    records even for the GC/MS equipment that Harris discussed — that the request
    was unduly burdensome and that Brady required the government to produce
    information about problems with the equipment — either are unsupported (and
    contradicted by Harris‘s sworn statement about the minimal burden of production)
    or do not take into account the relevance of information about (possible) lack of
    adherence to a maintenance or calibration regimen. Thus, we cannot uphold the
    trial court‘s ruling with respect to maintenance and calibration records for the
    GC/MS equipment used in this case.
    d. Audit reports. The trial court rejected appellant‘s request to compel
    production of ―audit reports on the operations of the DEA lab‖ as ―unduly
    burdensome‖ (noting, as to this category, too, that Brady ―obligates the
    government to disclose any problems with the accuracy of tests that may have been
    (…continued)
    did not interpret a rule of criminal procedure analogous to our Rule 16 (a)(1)(E);
    rather, it applied Maryland law that establishes a relevance standard (rather than
    our jurisdiction‘s ―materiality‖ standard). Compare 
    Curtis, 755 A.2d at 1014
    –15
    (holding that what is required to establish materiality under the rule currently
    codified as Rule 16 (a)(1)(E) is ―some preliminary showing of a reason to doubt
    the chemical analysis provided by the government‖), with 
    Cole, 835 A.2d at 608
    (explaining that ―to show a given document or item of information is discoverable,
    a defendant must show . . . that the information or document is relevant to the
    subject matter of the case‖).
    25
    revealed as a result of any audits‖). Yet, Harris‘s third affidavit averred that the
    burden associated with producing the audit reports is minimal, explaining that such
    reports ―are required to be . . . stored in easily accessible locations in order to
    maintain accreditation,‖ and the government put forth no evidence of its own to
    dispute Harris‘s assertion. Appellant‘s specific request — for ―any audit reports
    for the period beginning one year prior to the testing performed in‖ this case —
    may, however, be overly broad, since it appears to seek documents covering a time
    period other than the one during which DEA chemist Edwards performed her
    analysis in connection with appellant‘s case. On remand, the trial court should
    reconsider the request for audit reports that are temporally relevant.
    e.   Proficiency examinations and performance evaluations.         The final
    category of documents in dispute pertains to ―proficiency examinations and
    performance evaluations for the chemist who . . . tested the suspected marijuana.‖
    In denying appellant‘s request to compel production, the trial court reasoned that
    disclosure was not mandated ―[g]iven the applicability of the Privacy Act [5 U.S.C.
    § 552a (2012)].‖ Appellant argues that such denial was an abuse of discretion
    because ―courts have unanimously held that the Privacy Act does not create a
    discovery privilege.‖    We agree with appellant that the trial court‘s rationale
    reflected an erroneous legal interpretation and was not a sufficient basis for
    26
    denying his request. See In re Tucker, 
    689 A.2d 1214
    , 1215–16 (D.C. 1997)
    (recognizing that the Privacy Act allows for the disclosure of information
    otherwise protected by the Act ―pursuant to the order of a court of competent
    jurisdiction,‖ and concluding that this term includes ―the court with jurisdiction
    over the substantive controversy,‖ which therefore ―has jurisdiction to determine
    whether disclosure of the records in question should be required‖ (internal
    quotation marks omitted)).
    In Laxalt v. McClatchy, the United States Court of Appeals for the District
    of Columbia Circuit held that the district court ―applied the wrong legal standard‖
    when it required appellants to show ―a specific need for [] documents‖ that they
    requested in (civil) discovery and that were subject to the Privacy Act. 
    809 F.2d 885
    , 886 (D.C. Cir. 1987) (internal quotation marks omitted). The court reasoned
    that the Privacy Act ―does not create a qualified discovery privilege‖ and does not
    ―create any other kind of privilege or bar that requires a party to show actual need
    as a prerequisite to invoking discovery.‖ 
    Id. at 888.
    Rather, ―the plain language of
    the statute permits disclosure ‗pursuant to the order of a court of competent
    jurisdiction.‘‖ 
    Id. (citing 5
    U.S.C. § 552a (b)(11) (1982)). The court found ―no
    basis for inferring that the statute replaces the usual discovery standards . . . with a
    different and higher standard‖ and held that ―a party can invoke discovery of
    27
    materials protected by the Privacy Act through the normal discovery process and
    according to the usual discovery standards.‖ 
    Id. at 888–89;
    see also 
    id. at 889
    (noting that the fact that a document is subject to the Privacy Act may be relevant
    ―to the manner in which discovery should proceed‖ and that the district court had
    ―ample discretion to fashion [an] appropriate protective order[] upon a showing of
    ‗good cause‘‖ (citation omitted)).
    In the instant case, the trial court erroneously relied solely on a more
    restrictive application of the Privacy Act. We conclude that the DEA chemist‘s
    proficiency testing results and performance evaluations (which bear on the DEA
    chemist‘s competence to perform the drug testing and trustworthiness in accurately
    reporting test results) were material to appellant‘s defense and that the trial court‘s
    ruling denying appellant‘s request to compel productions of these items solely on
    the basis of the Privacy Act, and without consideration of a protective order,
    cannot be sustained.16
    16
    The government argues that the documents were not material because the
    government was obligated under Giglio v. United States, 
    405 U.S. 150
    (1972), to
    disclose any proficiency-examination failures and negative performance
    evaluations. As appellant argues, however, that obligation at least arguably would
    not require the government to produce passing but low-proficiency examination
    results, and adherence to its obligations under Giglio presumably would not require
    the government to disclose, e.g., that, at the time she performed her analysis, the
    chemist had not been tested recently.
    28
    IV.
    The remaining issue is whether appellant was prejudiced by the denial of his
    motion to compel. As noted above, our task is to ―determine the likelihood that the
    verdict would have been different had the government complied with the discovery
    rules.‖   
    Ferguson, 866 A.2d at 65
    (internal quotation marks omitted).         If we
    ―cannot say, with fair assurance, after pondering all that happened without
    stripping the erroneous action from the whole, that the judgment was not
    substantially swayed by the error,‖ or if we are ―left in grave doubt, the conviction
    cannot stand.‖ 
    Id. (quoting Kotteakos
    v. United States, 
    328 U.S. 750
    , 765 (1946)).
    We have considered whether the issue of prejudice (from appellant‘s lack of
    access to documents that might have enabled him to create doubt about whether the
    plant-like substance was marijuana) is resolved by the fact that several times —
    during his opening statement and closing argument — appellant‘s trial counsel
    referred to the substance as marijuana. As the government asserts, appellant ―did
    not contest at trial that the substance found inside the bag was marijuana.‖ Quite
    the contrary, in his opening statement, appellant‘s counsel stated, ―These officers
    found a bag that had marijuana in it[,] and they assumed that it belonged to Mr.
    29
    Buchanan‖ (emphasis added), and in his closing argument told the court that
    appellant was ―not contesting that whoever possessed that bag . . . and that
    marijuana would be guilty of these crimes‖ and argued that the case was about
    officers ―jumping to conclusions‖ when they ―found this marijuana[] [and] . . .
    assumed it belonged to Mr. Buchanan.‖ We have said that such references may be
    ―tantamount to, or indeed constitute[], evidentiary admissions‖ that are ―binding
    upon the party.‖ Kaliku v. United States, 
    994 A.2d 765
    , 777 (D.C. 2010) (internal
    quotation marks omitted) (stating that counsel‘s repeated statements, during
    opening and closing, that their clients engaged in consensual sexual acts with the
    victim constituted evidentiary admissions that rendered harmless the government‘s
    failure to produce for cross-examination the FBI analyst who performed the testing
    that concluded that the victim‘s DNA was found on defendants‘ penile swabs).
    We decline to decide the appeal on this basis, however. We recognize that
    counsel‘s approach, like his decision to forgo cross-examination of the DEA
    chemist, may have reflected his assessment that a challenge to whether the plant-
    like substance was marijuana was not ―worth the candle‖ in light of the trial court‘s
    denial of the defense motion to compel documents that might have been used to
    undermine the results reported on the DEA-7. 
    Jackson, 768 A.2d at 584
    .
    30
    The government argues that appellant‘s ―stipulat[ion] to the chemist‘s report
    and analysis‖ forecloses his argument that he was prejudiced by the court‘s
    discovery ruling. We agree that the stipulation may be taken as a concession that
    the DEA chemist‘s report was sufficiently reliable to be admissible, 17 but we reject
    the notion that the stipulation now precludes appellant from arguing that he was
    entitled to discovery that may have enabled him to persuade the fact-finder that
    there was a reason to doubt the DEA-7 results. Cf. Byrd v. United States, 
    485 A.2d 947
    , 950 (D.C. 1984) (―[T]he defense was not foreclosed from calling witnesses in
    contradiction‖ of stipulated testimony); see also Criminal Jury Instructions for the
    District of Columbia, No. 2.104 cmt. (5th ed. rev. 2012) (―When the parties agree
    that stipulated testimony or deposition testimony is admitted, the parties are still
    free to challenge that evidence in the same manner as they would live testimony.‖).
    As discussed above, through the DEA chemist‘s report, the government
    presented evidence that the chemist performed three tests whose results led her to
    conclude that the plant-like substance was marijuana: microscopic examination,
    the D-L test, and the GC/MS test.        We agree with the government that the
    17
    See Minor v. United States, 
    57 A.3d 406
    , 421 n.11 (D.C. 2012)
    (recognizing that expert testimony must be sufficiently reliable to be admissible).
    Appellant acknowledges that he ―stipulated to the admissibility of the
    government‘s drug analysis.‖
    31
    consistent positive results on each of the tests employed strengthened the
    government‘s evidence and weighs against a reason to doubt. 18 We also note that
    the government produced a photograph of the color results of the D-L test, and
    appellant‘s expert did not suggest that the DEA chemist made an interpretation
    error with respect to those results. However, Harris‘s affidavits informed the court
    that the results of each of these tests are ―susceptible to error‖ and have ―an
    associated degree of uncertainty.‖ Specifically, Harris averred that ―other plant
    species unrelated to marijuana share similar morphological characteristics‖ on
    microscopic review; that the D-L test is expected to sometimes yield false
    positives, both because it is a screening test and because the analysts must interpret
    the colors the test produces; and that false positive results can be obtained on the
    GC/MS test because of sample contamination or ―[i]ncorrect or overreaching data
    interpretation.‖ In addition, as discussed above, from her review of the DEA
    chemist‘s worksheets, Harris observed that the chemist ―used the remaining
    portion of another test sample to conduct [the D-L test and that this] is not proper
    18
    The substance also field-tested positive for THC. While a field test ―is
    not dispositive‖ and, ―standing alone, cannot prove [the nature of the substance]
    beyond a reasonable doubt,‖ it ―does constitute evidence of the identity of the
    seized substance‖ and can be considered in a determination of whether the
    government‘s evidence ―was overwhelming.‖ Digsby v. United States, 
    981 A.2d 598
    , 605–06 (D.C. 2009) (internal quotation marks and brackets omitted).
    32
    scientific practice and could result in contamination of the sample prior to the D-L
    test.‖
    In light of the deviation from ―proper scientific practice‖ Harris alleged, the
    potential for error she identified in each set of test results, and the government‘s
    failure to produce any documents within the categories discussed above —
    documents that may bear on the likelihood that the chemist performed her analysis
    in a reliable way — we are unable to assess whether appellant was prejudiced by
    the lack of access to documents he was entitled to access under Rule 16 (a)(1)(E).19
    19
    We are mindful of the government‘s assertion (and of the trial court‘s
    comments highlighting) that the defense forwent opportunities to challenge the
    government‘s forensic evidence by, for example, calling Harris to testify at trial or
    engaging a chemist to test the suspected marijuana. But, of course, appellant had a
    ―constitutional right to put the government to its proof and not put on a
    defense . . . .‖ Thomas v. United States, 
    914 A.2d 1
    , 16 (D.C. 2006). Moreover,
    we are reluctant to decide the issue before us — whether appellant was entitled to
    discovery under Rule 16 (a)(1)(E) — on the basis of whether appellant utilized
    opportunities that could have implicated his privilege against self-incrimination by
    requiring him to disclose information that ―might work to his disadvantage.‖ Fed.
    R. Crim. P. 16 advisory committee‘s note to 1974 amendments (including
    amendments that gave ―greater discovery to . . . the prosecution‖); see also Fed. R.
    Crim. P. 16 (b)(1)(B) (providing that ―[i]f a defendant requests disclosure [of any
    report of a scientific test] under Rule 16 (a)(1)(F) and the government complies,
    the defendant must permit the government, upon request, to inspect and to copy or
    photograph the results or reports of any . . . scientific test or experiment [within the
    defendant‘s possession, custody, or control] if . . . the defendant intends to use the
    item in the defendant‘s case-in-chief at trial, or intends to call the witness who
    prepared the report and the report relates to the witness‘s testimony‖).
    (continued…)
    33
    Without the SOPs, training and proficiency/performance materials, validation
    studies and temporally relevant audit report(s), and maintenance and calibration
    logs for the GC/MS equipment used in this case, we cannot say whether the
    possible flaw Harris identified was significant enough ―to call in question the
    government‘s proof of the identity of the substances analyzed,‖ 
    Jackson, 768 A.2d at 584
    , or whether the impact ―possibly could be great enough to be helpful to
    appellant,‖ Young v. United States, 
    63 A.3d 1033
    , 1056 (D.C. 2013).             ―The
    assistance of the trial court [in evaluating prejudice vel non] is therefore
    necessary.‖ 
    Jackson, 768 A.2d at 584
    .
    V.
    For the foregoing reasons, we remand the record to the trial court with
    instructions that (1) the trial court is to reconsider its ruling with respect to the
    validation studies, maintenance and calibration records for the GC/MS equipment
    used in this case, and audit reports; (2) the government is to produce, for inspection
    by the court and the defense, any documents falling within those categories the
    (…continued)
    Accordingly, the forgone opportunities the government highlights do not enter into
    our analysis of prejudice.
    34
    trial court decides must be produced after reconsidering its ruling, as well as the
    DEA laboratory SOPs and training materials and the DEA chemist‘s proficiency
    examination results and performance evaluations whose production appellant
    sought to compel; and (3) after such further proceeding as it deems appropriate, the
    trial court is to make findings relevant to this court‘s ultimate decision as to
    20
    whether the erroneous nondisclosure was prejudicial.        This court will, of course,
    after briefing by the parties, ―have [the] . . . last word as to whether or not to
    sustain [appellant‘s] conviction that follow[ed] a trial marred by [the discovery-
    ruling] . . . error[s]‖ described above. 
    Davis, 564 A.2d at 33-34
    .
    So ordered.
    20
    The record of the remand proceedings shall be certified by the Clerk of
    the Superior Court to the Clerk of this court.