United States v. Spencer , 873 F.3d 1 ( 2017 )


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  •           United States Court of Appeals
    For the First Circuit
    No. 16-1104
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    BARRY SPENCER,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MASSACHUSETTS
    [Hon. Rya W. Zobel, U.S. District Judge]
    Before
    Torruella, Kayatta, and Barron,
    Circuit Judges.
    Karen A. Pickett, with whom Pickett Law Offices, P.C. was on
    brief, for appellant.
    Cynthia A. Young, Assistant United States Attorney, with whom
    William D. Weinreb, Acting United States Attorney, was on brief,
    for appellee.
    August 23, 2017
    BARRON, Circuit Judge.         Barry Spencer was convicted in
    federal court of one count of possession with intent to distribute
    cocaine base, in violation of 
    21 U.S.C. § 841
    (a) and 
    18 U.S.C. § 2
    , and one count of conspiracy to possess with intent to
    distribute cocaine base, in violation of 
    21 U.S.C. § 846
    .          He now
    appeals the District Court's denial of his motion for a new trial,
    which relied primarily on the government's alleged violation of
    Brady v. Maryland, 
    373 U.S. 83
     (1963).        Spencer also challenges on
    appeal the admission at trial of certain testimony from two police
    officers concerning Spencer's conduct during (and immediately
    preceding) the undercover drug purchase that led to the charges
    against Spencer, certain statements made by the prosecutor during
    closing argument, and the decision by the Magistrate Judge assigned
    to   Spencer's   case   to   deny   discovery   on   Spencer's   claim   of
    vindictive prosecution.      Finding no merit to these challenges, we
    affirm.
    I.
    We first recount key aspects of the record developed at
    Spencer's trial (which followed an earlier mistrial) and at two
    post-trial hearings before the District Court.          We recount, too,
    the procedural history of the case. Because a number of the issues
    that Spencer raises on appeal are quite fact-dependent, we focus
    up front on only those facts that pertain to his conviction on the
    two drug counts.    We thus reserve a full discussion of the facts
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    relevant to the specific challenges that Spencer raises on appeal
    for our consideration of the merits of the challenges.           We do,
    however,   provide    sufficient   detail   regarding   the   procedural
    history to isolate the particular issue on which his primary
    challenge -- concerning the alleged Brady violation -- hinges.
    A.
    According to testimony at trial, on March 20, 2013, two
    members of the Boston Police Department (“BPD”) -- Detective
    Sergeant Donald Keenan and Officer Richard Casallas -- identified
    Spencer as someone who was potentially selling drugs in the
    Egleston Square area of Roxbury, one of Boston's neighborhoods.
    According to Keenan's trial testimony, Keenan was familiar with
    Spencer "from the neighborhood" and made the decision to deploy
    Casallas, who was working undercover, to make a drug purchase.
    Casallas then approached Spencer and asked if Spencer was “on.”
    Spencer responded that he was “always on,” and Casallas then asked
    Spencer if he could purchase $20 of crack cocaine.        Spencer told
    Casallas to follow him, and the two men briefly walked down the
    street together.     Spencer then told Casallas to return to the bus
    stop where they had started.
    Several minutes later, according to testimony at trial,
    Spencer came back with Michael Morrison.      Casallas testified that,
    with Spencer "scanning the area, looking at car[s] as they drove
    by," Morrison sold Casallas a small bag of crack cocaine in
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    exchange for $20.       Casallas and Spencer and Morrison then went
    their separate ways.
    Spencer was arrested several days later, on May 26, 2013,
    in connection with the undercover purchase of the crack cocaine.1
    Thereafter, the case was transferred to federal authorities for
    prosecution, and, on June 26, 2013, Spencer was indicted by a
    federal grand jury and charged with one count of possession with
    intent to distribute cocaine, in violation of 
    21 U.S.C. § 841
    (a)
    and 
    18 U.S.C. § 2
    .      In a superseding indictment filed on August
    28, 2013, the government also charged Spencer with one count of
    conspiring -- with Morrison -- to possess with intent to distribute
    cocaine, in violation of 
    21 U.S.C. § 846
    .            On March 26, 2014, the
    government filed a second superseding indictment that specified
    that the controlled substance was cocaine base, not cocaine.
    Spencer's   first   trial   on   these    charges   ended   in   a
    mistrial. As the District Court later explained, one of the jurors
    then sent an "unsolicited letter to the court" expressing the
    sentiment    that    "the   total    case    .   .    .   seemed   unfair[,]
    [u]njust[, and] [w]rong."       Spencer was, however, retried on the
    same charges.       And, after a three-day trial, Spencer was found
    guilty on both counts of the second superseding indictment and
    1 Morrison was initially charged together with Spencer, but
    Morrison pleaded guilty to the three counts against him in the
    first superseding indictment. The second superseding indictment
    thus charged Spencer alone.
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    sentenced to 60 months' imprisonment and 36 months' supervised
    release.
    B.
    On May 14, 2015, several weeks after Spencer had been
    convicted of these charges, he filed, pro se, what he styled as a
    "Renewed Motion for a Required Finding of Not Guilty or, in the
    Alternative, for a New Trial."          That motion claimed, among other
    things, a Brady violation.           Specifically, Spencer contended that
    the government had, in violation of Brady, failed to turn over
    evidence regarding the prosecution's involvement in triggering a
    correction    to   certain    erroneous       information      set    forth      on   a
    certificate     that   had    been    issued     by    the   chemist       for    the
    Massachusetts      State     Police    Laboratory       (the      “State      Police
    Laboratory”)    who    was   responsible      for     analyzing      the   chemical
    composition of a sample of the substance that the government
    alleged Casallas had purchased from Morrison.
    The District Court denied Spencer's motion for a new
    trial on October 8, 2015.              In doing so, the District Court
    explained that, based on United States v. Del-Valle, 
    566 F.3d 31
    ,
    38 (1st Cir. 2009):
    [i]n the normal course, a defendant who seeks a new trial
    on the basis of newly discovered evidence must establish
    that: (1) the evidence was unknown or unavailable to the
    defendant at the time of trial; (2) failure to learn of
    the evidence was not due to lack of diligence by the
    defendant; (3) the evidence is material and not merely
    cumulative or impeaching; and (4) the emergence of the
    - 5 -
    evidence will probably result         in   an   acquittal   upon
    retrial of the defendant.
    However, because the basis for Spencer's motion was "that the
    government failed to disclose evidence required to be disclosed"
    under Brady, the District Court -- quoting United States v.
    González-González, 
    258 F.3d 16
    , 20 (1st Cir. 2001) -- explained
    that    a   "more   defendant-friendly   .    .    .   standard    applies."
    Specifically, the District Court noted that, as we held in United
    States v. Flores-Rivera, 
    787 F.3d 1
    , 15-16 (1st Cir. 2015), with
    respect to what a defendant must show when seeking a new trial
    based on violation of Brady, "[i]nstead of requiring that the
    defendant show that an acquittal would have 'probably' resulted
    had the material been produced, we require only that the defendant
    show a 'reasonable probability' that had the government disclosed
    the evidence prior to trial, the result of the proceeding would
    have been different."
    The District Court then applied this more "defendant-
    friendly" test, under which Spencer's "threshold" burden was to
    show that a Brady violation did, in fact, occur.          Accordingly, the
    District Court used the three-prong test outlined by the Supreme
    Court in Strickler v. Greene, 
    527 U.S. 263
    , 281-82 (1999), for
    determining whether a Brady violation occurred.            As the District
    Court explained, under Strickler, "[t]here are three components of
    a true Brady violation: [1] [t]he evidence at issue must be
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    favorable to the accused, either because it is exculpatory, or
    because    it    is   impeaching;     [2]   that     evidence    must    have   been
    suppressed by the State, either willfully or inadvertently; and
    [3] prejudice must have ensued."               
    Id.
          And, the District Court
    further explained, relying on Kyles v. Whitley, 
    514 U.S. 419
    , 434
    (1995), that, in order to show prejudice under Brady, the defendant
    must demonstrate that the undisclosed evidence is material -- that
    is, the defendant must show that there would be a "reasonable
    probability of a different result" at trial had the evidence been
    disclosed.
    The District Court concluded that, with respect to the
    evidence concerning the prosecution's contacts with the chemist
    for the State Police Laboratory that had not been disclosed by the
    government, Spencer had succeeded in meeting his burden as to the
    first two prongs of the test for finding a Brady violation set
    forth in Strickler.        The District Court concluded, however, that,
    "by the narrowest of margins," Spencer had not shown that he was
    prejudiced by the government's withholding of the evidence -- that
    is, that he had not shown that it was reasonably probable that the
    outcome at trial would have been different had the evidence been
    disclosed.       Accordingly, the District Court ruled that there had
    been no Brady violation. And, because the District Court concluded
    that   Spencer's      motion    --    although     it    also   referenced      other
    issues    --    "focused   on   the    government's       failure   to   disclose"
    - 7 -
    evidence   regarding    the    prosecution's   communications      with   the
    chemist for the State Police Laboratory, the District Court denied
    the motion.
    Spencer then filed this timely appeal, in which he
    challenges four separate rulings below:            first, the District
    Court's denial of his motion for a new trial under Brady on the
    ground that the undisclosed evidence was not material; second, the
    admission at trial of certain testimony from the two police
    officers who organized and participated in the undercover drug
    purchase that led to Spencer's arrest; third, the District Court's
    refusal to declare a mistrial in consequence of certain statements
    made by the prosecution during closing argument; and, finally, the
    decision to deny Spencer discovery on his motion to dismiss the
    case against him based on an allegation of vindictive prosecution.
    We consider each challenge in turn.
    II.
    We   start   with    Spencer's   challenge   to   the   District
    Court's ruling denying the motion for a new trial based on the
    claimed Brady violation.       Spencer challenges only the third step
    of the District Court's Brady analysis, concerning the materiality
    of the undisclosed evidence, and thus we, too, focus on that issue.
    For the reasons that follow, we reject Spencer's contention that
    the District Court reversibly erred in denying Spencer's Brady-
    based motion.
    - 8 -
    A.
    We have explained that, "[i]n Brady, the Supreme Court
    held the Government's suppression of evidence favorable to the
    accused violates due process where the evidence is material to
    guilt or punishment."       Conley v. United States, 
    415 F.3d 183
    , 188
    (1st Cir. 2005) (citing Brady, 
    373 U.S. at 87
    ).                This materiality
    prong of the Brady inquiry requires that the defendant show that
    "there is a reasonable probability that, had the evidence been
    disclosed, the result of the proceeding would have been different."
    Turner v. United States, 
    137 S. Ct. 1885
    , 1893 (2017) (quoting
    Cone v. Bell, 
    556 U.S. 449
    , 469-70 (2009)).
    As     the   Supreme   Court    emphasized     in    Strickler     with
    respect   to    materiality,      "[t]he   question      is   not   whether   the
    defendant would more likely than not have received a different
    verdict with the evidence, but whether in its absence he received
    a fair trial, understood as a trial resulting in a verdict worthy
    of confidence."      
    527 U.S. at 264
     (quoting Kyles, 
    514 U.S. at 434
    );
    see also Turner, 137 S. Ct. at 1893 ("A reasonable probability of
    a   different    result   is   one   in    which   the   suppressed    evidence
    undermines confidence in the outcome of the trial." (citations
    omitted)).      On the basis of this precedent, we have explained that
    "[t]his somewhat delphic 'undermine confidence' formula suggests
    that reversal might be warranted in some cases even if there is
    less than an even chance that the evidence would produce an
    - 9 -
    acquittal."       Flores-Rivera, 787 F.3d at 16 (quoting Conley, 
    415 F.3d at 188
    ).
    We    review    the    District    Court's   denial    of   Spencer's
    motion for a new trial on the basis of the government's alleged
    Brady violation for abuse of discretion.             United States v. Cruz-
    Feliciano, 
    786 F.3d 78
    , 87 (1st Cir. 2015).               Because, as we have
    explained, the key issue concerns the materiality, under Brady, of
    the undisclosed evidence, we are mindful in undertaking this review
    that "the district court's determination on the materiality of
    newly discovered evidence in prosecutorial nondisclosure cases is
    ordinarily accorded deference," United States v. Sanchez, 
    917 F.2d 607
    , 618 (1st Cir. 1990) (citations omitted), "[d]ue to its
    inherently fact-bound nature," 
    id.
     (citation omitted); see also
    United States v. Imbruglia, 
    617 F.2d 1
    , 7 (1st Cir. 1980) (noting
    that the "district judge, who presided at appellant's trial,
    reviewed appellant's newly discovered evidence and concluded it
    did not justify the granting of a new trial" and concluding that
    "[h]is assessment deserves regard").
    B.
    To assess the merits of the District Court's Brady ruling
    as to materiality, we first need to set forth in more detail
    exactly    what    the     District    Court    determined   the    undisclosed
    evidence   was     and   how   the    government's   nondisclosure       of   that
    evidence came to light.           And so we now turn to that task.
    - 10 -
    At trial, Spencer's attorney sought to draw the jury's
    attention   to    the   fact   that    the     government   had    produced   two
    different "certificates of drug analysis" that were prepared and
    signed by Claire Rimkus, the chemist at the State Police Laboratory
    who was responsible for analyzing the sample from the substance
    that   Casallas    allegedly    had    purchased     from   Morrison.         Both
    certificates were ultimately admitted into evidence.
    Each certificate stated that the sample "was found to
    contain Cocaine . . . present in the base form."                  Moreover, each
    certificate      identified    the    same   "agency   case   number"     (often
    referred to as a "cc" or "control" number) that had been assigned
    to the sample by the BPD.        That control number was 130164540.
    Officer Sean Flaherty -- the BPD officer responsible for
    processing the substance alleged to be the cocaine base that
    Casallas purchased from Morrison -- explained at trial that this
    control number was generated by the BPD's "Computer Aided Dispatch
    system" on March 20, 2013, once Flaherty had received the sample
    from Keenan, and before Flaherty had completed the necessary intake
    forms and placed the sample in a heat-sealed bag.                 Flaherty also
    explained at trial that the purpose of assigning this control
    number was to ensure that "every piece of evidence . . . is
    tracked."
    The problem was that the first certificate of drug
    analysis that Rimkus prepared, dated September 26, 2013, indicated
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    that the "date of incident" associated with the sample was May 26,
    2013.     That latter date was the date of Spencer's arrest.                    It was
    not the date of the alleged transaction between Casallas, the
    undercover officer, and Morrison, the co-defendant.                        The second
    certificate was dated April 4, 2014.                  That certificate indicated
    that the "date of incident" associated with the sample was March
    20, 2013.       That date was the date of the alleged transaction.
    In light of the fact that there were two certificates,
    and that only the latter one correctly stated the date of the
    alleged    incident,      Spencer's       counsel      asked   Rimkus,     on    cross-
    examination, about the discrepancy.               Rimkus responded that, after
    she had prepared the first certificate, "it was discovered that
    the Boston Police had essentially given [her] the wrong date of
    the incident when they submitted the evidence."                   Rimkus explained
    that she did not know the reason that the BPD had given her the
    wrong    date    originally.       Rather,       she    explained,     she      "simply
    receive[d] a drug evidence submission form [sometimes referred to
    as an “SP-295” form] with suspect name, incident date, incident
    number, and that is the information that [she] put on [her]
    report."    Rimkus further testified that, with the new information
    in hand, "[she] then prepared a corrected report," with "[t]he
    only    difference    .   .   .   being    a    different      date   of   incident."
    Accordingly,       Rimkus     testified        that    she     prepared    a     second
    - 12 -
    certificate, dated April 4, 2014, which indicated that the correct
    "date of incident" associated with the sample was March 20, 2013.
    On the basis of the fact that there were two certificates
    setting       forth    different    dates    of     incident,    defense      counsel
    contended in the closing argument to the jury that the government
    had conducted a "sloppy investigation" and asserted that there
    were "a whole host of reasons why you should not be persuaded
    beyond a reasonable doubt that Barry Spencer is guilty of being a
    dope dealer."         After the case had been submitted to the jury, the
    jury    requested       a    "signed/notarized"       copy      of   the   April     4
    certificate. "[N]o such copy was admitted into evidence," although
    the    jury    did    have   a   copy   of   both   certificates,      just    not   a
    "notarized copy of the corrected version." The jury then convicted
    Spencer.
    Approximately two weeks later, on May 4, 2015, Spencer
    filed, pro se, his motion for a new trial in which he raised the
    Brady claim.          In that motion, Spencer asserted -- presumably on
    the basis of Rimkus's testimony that "it was discovered that Boston
    Police had essentially given [her] the wrong date of incident" --
    that Rimkus "testified" at trial that she had "received a call and
    was told to change the date [of incident]" on the certificate.
    Spencer further asserted that the government, in violation of
    Brady, had failed to disclose evidence that "could [have] been
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    used to impeach . . . the caller who told Claire Rimkus to change
    the date on the sample."
    On May 19, 2015, the District Court held a hearing on
    that motion and on Spencer's separate motion to appear pro se at
    that hearing and during sentencing.                   At the hearing, Spencer
    (appearing pro se) again asserted that the government, in violation
    of Brady, had not turned over evidence concerning a phone call
    that Spencer alleged had been made to Rimkus instructing her to
    change the date of incident on the lab certificate.
    In response to that assertion by Spencer, the Assistant
    United     States    Attorney     ("AUSA")       in     charge      of   Spencer's
    prosecution,      John    Wortmann,    revealed       that,   in    fact,    he   had
    telephoned Rimkus on April 3, 2014, to inform her about the error
    in the first certificate with respect to the date of incident.
    Wortmann explained that Rimkus had no knowledge of the actual date
    of incident and that Rimkus had simply relied on the BPD to supply
    that information.        Specifically, Wortmann stated that "[t]he lab
    doesn't    know   where    the   drugs   --    what    date   the    drugs   [were]
    purchased.    They can't possibly know that.            And the clerical error
    was committed when the drugs were submitted [by the BPD] to the
    lab."     As a result, Wortmann stated that he had simply contacted
    Rimkus to correct a "clerical error" on the drug certificate
    "because the drug lab would have no basis for knowing one way or
    - 14 -
    the other."      Wortmann suggested that he had also sent a follow-up
    e-mail to the BPD after the phone call with Rimkus.
    The District Court deemed the government's failure to
    disclose its "involvement in revising a key exhibit" "troubling."
    On   June   4,    2015,   the   District      Court    sua    sponte     ordered    an
    evidentiary hearing.        Two weeks later, the government produced a
    "Case   Conversation      Log   Report"     that    had     not   previously      been
    produced to Spencer in which, as the District Court highlighted,
    "State Drug Lab employees, including Ms. Rimkus, recorded many .
    . . of their conversations with the police and prosecutors."
    The evidentiary hearing took place on July 2, 2015.
    During that hearing, Rimkus provided additional testimony.                        This
    testimony,       the   District     Court     found,        "corroborat[ed]"       the
    government's account of the contact between Wortmann and Rimkus,
    in which Wortmann telephoned Rimkus to correct the incorrect date
    of incident set forth on her initial certificate.                       The District
    Court also noted that Rimkus testified that, after speaking with
    Wortmann, Rimkus called the BPD's evidence unit to confirm the
    incident date.
    Approximately      a   week    after     the    July   2    evidentiary
    hearing,    on    July    10,   2015,   the    District       Court     ordered    the
    government to produce the follow-up e-mail to the BPD that Wortmann
    had testified at the May 19 hearing that he had sent to Rimkus.
    The District Court ultimately found that, "[a]fter a thorough
    - 15 -
    search of the AUSA's e-mails, the government concluded that he
    misspoke and no such email exchange occurred."
    C.
    On the basis of the record that had been developed, the
    District Court denied Spencer's Brady-based motion for a new trial.
    The District Court identified two distinct types of evidence that
    the government had failed to disclose -- (1) the State Police
    Laboratory call log, and (2) other evidence, including the AUSA's
    own testimony, concerning his "communications with Ms. Rimkus more
    generally." The District Court concluded that, as to each category
    of undisclosed evidence, the evidence was not material under the
    standard articulated in Strickler and thus that Spencer's Brady
    claim failed.
    The District Court began by addressing the government's
    failure to turn over the call log.          The District Court stated that
    this   evidence   of    the   prosecutor's        "close    involvement    in   the
    Certificate's     preparation"    was,      per    the     first   prong   of   the
    Strickler   test,      "favorable"    to    Spencer.         Specifically,      the
    District Court concluded that had the call log been produced, the
    fact that it "describes . . . Ms. Rimkus's entry for April 3, 2014
    [that] indicates that the AUSA told her about a mistake on the
    Certificate and where it came from . . . may well have called Ms.
    Rimkus's conclusions into doubt."           That was so, the District Court
    elaborated, particularly given "the jury's question about chain of
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    custody, the proof of which depended largely on the documentation
    implicated in the instant motion."
    The District Court also ruled in Spencer's favor as to
    Strickler's second prong, which concerned whether evidence of the
    call   log's    existence      was   suppressed,     either     willfully     or
    inadvertently, by the government.             In this regard, the District
    Court concluded that, although the United States Attorney's Office
    was not aware that the State Police Laboratory had a practice of
    logging calls from prosecutors, Rimkus was nevertheless "part of
    the prosecution team."       As a result, "because [Rimkus] knew about
    the call log well in advance of Mr. Spencer's first trial, the
    government's 'we didn't know' excuse for failing to produce it to
    the defense fails."
    But, in considering the final, prejudice prong of the
    Strickler analysis, the District Court ruled against Spencer,
    though "only by the narrowest of margins."                 The District Court
    explained that, "[a]t trial, the government presented evidence
    that   the   alleged   drugs    purchased     from   Mr.    Morrison,   in   the
    transaction    where   Mr.     Spencer   stood    watch,    were   assigned    a
    control . . . number by the [BPD]."               And, the District Court
    explained, "[t]he evidence showed that the sample bearing [that]
    control number was sent to Ms. Rimkus at the State Drug Lab, and
    that she analyzed the sample bearing that control number in
    preparing her original Drug Analysis Report."               As a result, the
    - 17 -
    District Court emphasized that, regardless of any error by the BPD
    concerning the date of incident on the first form, the "control
    number associates the sample purchased from Mr. Morrison on March
    20, 2013 with the sample that tested positive for crack cocaine at
    the lab."
    Based on this reasoning, the District Court rejected
    Spencer's contention that there was a reasonable probability that
    the call log, had it been disclosed, would have been sufficient to
    undermine confidence in the jury's verdict.               As the District Court
    put it, "no reasonable jury could have concluded, in light of the
    control number records, that the chain of custody was broken."
    For   that     reason,    the     District       Court    concluded     that   the
    "government's failure to produce the call log . . . [,] while
    questionable, was not an actionable Brady violation."
    The   District     Court    then    turned   to    the   government's
    failure   to   disclose    additional       evidence      regarding    Wortmann's
    communications with Rimkus that might have shed further light on
    the nature and extent of Wortmann's intervention.                 This additional
    evidence included firsthand accounts of the conversation between
    Wortmann and Rimkus, such as the one that Wortmann provided during
    the May 19 hearing before the District Court.                  The District Court
    concluded that this evidence, too, was favorable to Spencer, as it
    "might have been used to paint Ms. Rimkus as sloppy, at best, or
    a pawn of the prosecution, at worst."             Likewise, "because the AUSA
    - 18 -
    himself was involved" in his communications with Rimkus "and
    necessarily knew they happened," the District Court concluded that
    the   government     willfully   suppressed     this    evidence    concerning
    Wortmann's communications with Rimkus.
    Nevertheless,   turning      to    the    third    prong   of   the
    Strickler test, which concerns the materiality aspect of Brady,
    the District Court ruled against Spencer. The District Court again
    emphasized     the    importance   of     the    fact    that    the    control
    number -- common to both the initial certificate (which had the
    wrong date of incident) and the corrected certificate (which had
    the right date of incident) -- matched the sample Rimkus analyzed
    to the substance obtained during Casallas's undercover purchase.
    Because "government counsel could have relied only upon the control
    number to show the chain of custody and integrity of Ms. Rimkus's
    test results[, n]o reasonable jury could have doubted that the
    sample delivered to Ms. Rimkus was the same one purchased from Mr.
    Morrison on March 20, 2013."
    D.
    Spencer contends, in challenging the Brady ruling below,
    that the undisclosed evidence -- whether considered individually
    or in combination -- would have enabled him to "cast doubt" on the
    link between Spencer and the sample Rimkus determined contained
    cocaine base.        Spencer further contends that the disclosure of
    this evidence at trial would have rendered a different outcome
    - 19 -
    reasonably probable. Spencer thus contends that the District Court
    abused its discretion in denying his motion for a new trial on the
    ground that the undisclosed evidence was not material within the
    meaning of the third prong of the Strickler test for identifying
    a Brady violation.
    In    support   of    that   contention,   Spencer   makes    the
    following points.        Spencer contends that the withheld evidence
    would have enabled him to "establish a lack of confidence" in the
    jury's verdict by sowing doubt as to whether the sample Rimkus
    tested    was    taken   from   the   substance   Casallas   purchased   from
    Morrison on March 20.           In this regard, Spencer argues that the
    District Court wrongly relied on the "infallibility" of the control
    number.     On Spencer's account, by showing the role that the
    prosecutor played in getting Rimkus to change the date of incident,
    the withheld evidence "could have shown the possibility that [the
    control number] was incorrect or even manufactured as well."
    Spencer also emphasizes the District Court's statement -- with
    respect to the second Strickler prong -- that the withheld evidence
    might have "been used to paint Ms. Rimkus as sloppy, at best, or
    a pawn of the prosecution, at worst."
    In further support of his materiality argument, Spencer
    contends that the withheld evidence must be considered in light of
    a number of background features of the case.            Spencer points, in
    particular, to Rimkus's relative inexperience, the time lag before
    - 20 -
    the submission of the sample by the BPD to the State Police
    Laboratory, and an additional error on the form that the BPD used
    to submit evidence to the State Police Laboratory, which concerned
    how the sample had been obtained by the BPD.2 And, Spencer contends
    that his case is closely analogous to Flores-Rivera.           There, we
    overturned    a   district   court's   conclusion,   under   Brady,   that
    certain undisclosed evidence was not material.          787 F.3d at 20.
    Finally, Spencer notes, his first trial ended in a mistrial, with
    one of the jurors expressing significant unease with the case
    against Spencer.      On this basis, Spencer argues that, had that
    first jury known of the undisclosed evidence, "there would have
    been a 'reasonable probability' of an acquittal."
    E.
    No doubt, Spencer could have seized on the evidence that
    Wortmann contacted Rimkus and had her correct one aspect of the
    certificate that she prepared -- the date of incident -- to suggest
    that the control number was "incorrect or even manufactured." But,
    we do not see what basis we have on this record for second-guessing
    the trial judge's conclusion about whether the lost opportunity to
    2 The BPD submitted the substance to the State Police
    Laboratory for analysis on September 17, 2013, approximately six
    months after Casallas made the purchase from Morrison.          In
    addition, as the District Court noted, the submission form used by
    the BPD to submit the sample for analysis to the State Police
    Laboratory wrongly indicated that the "sample was the result of a
    '[s]eizure'" rather than a "'purchase,' which was another option
    on the form."
    - 21 -
    make   that    suggestion   to   the    jury   renders   the   nondisclosure
    material.     See Flores-Rivera, 787 F.3d at 17 (noting that "[w]e do
    not . . . automatically require a new trial whenever a combing of
    the prosecutors' files after the trial has disclosed evidence
    possibly useful to the defense but not likely to have changed the
    verdict"      (quoting United States v. Dumas, 
    207 F.3d 11
    , 15 (1st
    Cir. 2000) (alterations in original)).
    As we have explained, the undisclosed evidence shows no
    more than that Wortmann contacted Rimkus on April 3, 2014, in order
    to correct the date of incident on Rimkus's certificate of drug
    analysis.        But, the record shows that it was a BPD officer,
    Flaherty, who, much earlier, on March 20, 2013, assigned a control
    number to the substance that Flaherty had received from another
    BPD officer, Keenan, and that the same control number that Flaherty
    had assigned was on the sample that Rimkus analyzed.            In addition,
    the record shows that Rimkus relied, in preparing her certificates
    of drug analysis, on an error on the SP-295 form that the BPD used
    to submit evidence to the State Police Laboratory.               The record
    does not show that Rimkus relied on any materials that the BPD
    prepared    in    the   course   of   initially   processing    and   logging
    Casallas's undercover purchase.          In light of these aspects of the
    record, the District Court could reasonably conclude that the fact
    of the prosecutor's contact with Rimkus to correct the error
    regarding the date of incident on the initial certificate would
    - 22 -
    provide no more than a speculative basis for a conclusion that the
    control number itself was "incorrect or even manufactured."
    We also conclude that it was reasonable for the District
    Court    to   conclude   that,   even   if   the   control   number   was   not
    "incorrect or even manufactured," the undisclosed evidence does
    not suffice to cast doubt on whether Rimkus, due to her alleged
    sloppiness or her ties to the prosecution, tested the wrong sample.
    Spencer does not dispute, after all, that Rimkus conducted her
    own, independent analysis of the substance that she then determined
    was cocaine base.        And, nothing about the undisclosed evidence
    shows Rimkus to be sloppy or unprofessional in her work as a
    chemist for the State Police Laboratory.            Rather, the undisclosed
    evidence just shows that Rimkus corrected erroneous information
    that had been given to her and that she had no reason to know was
    wrong.    As a result, Spencer can only speculate that the substance
    that Casallas purchased from Morrison was "removed or changed
    between March 20, 2013, and September 2013 when it was allegedly
    tested by Ms. Rimkus."
    We thus conclude that the District Court did not abuse
    its discretion, as it reasonably determined that the withheld
    evidence did not generate a reasonable probability of a different
    outcome at trial by calling into question the "chain of custody"
    of the sample or the "integrity of Ms. Rimkus's test results."
    And this conclusion is consistent with Flores-Rivera.
    - 23 -
    The undisclosed evidence in that case consisted of (1)
    a letter to the prosecutor from the star witness to the crimes,
    and   (2)   notes    that   the   star   witness    had   made   concerning
    conversations he had had with two other cooperators while all three
    were in prison.      We explained that the notes, which directly cast
    doubt on the star witness's testimony regarding whether he had
    coordinated   with    the   other   witnesses,     constituted   the   "only
    evidence that would have eliminated the claim that the testimony
    [of the star witness and the other two cooperators] was entirely
    uncoordinated," and that the letter to the prosecutor "would have
    provided a uniquely colorful tool for both attacking [the star
    witness's] motivation and raising the prospect that [he] and the
    prosecutor were hiding something from the jury."            Flores-Rivera,
    787 F.3d at 20.
    The undisclosed evidence in this case, however, does not
    cast doubt in any similarly direct way on any similarly key
    representation.       As we have noted, Rimkus explained that she
    corrected the first certificate because "it was discovered" that
    the first certificate was wrong with respect to the date of
    incident on that certificate. But, the undisclosed evidence in no
    way undermines that representation.          And, similarly, it is not
    clear how the undisclosed evidence casts meaningful (as opposed to
    merely speculative) doubt on the credibility of any other witness
    - 24 -
    who testified about any aspect of the case that bears on the
    integrity of the control number.
    Moreover,   while   the   testimony   of   the   cooperating
    witnesses in Flores-Rivera that could have been undermined by the
    undisclosed evidence was "both essential to the convictions and
    uncorroborated by any significant independent evidence," id. at
    18, Rimkus's testimony was not similarly uncorroborated.        Rather,
    her testimony was supported by Casallas's and Keenan's testimony
    concerning the undercover drug purchase, Flaherty's testimony
    concerning the BPD's intake process, and the documentary evidence
    that indicated that the date of incident on the SP-295 form used
    by the BPD to submit the sample for analysis to the State Police
    Laboratory contained the error as to the date of incident that was
    then reproduced on Rimkus's initial certificate of drug analysis.
    Additionally, at both the trial and the evidentiary hearing on
    Spencer's Brady-based motion, Rimkus's testimony, although phrased
    in a manner that omitted mention of the AUSA's involvement, was
    consistent with Wortmann's.
    To be sure, the District Court did state that the
    question of prejudice from the non-disclosure failed "only by the
    narrowest of margins."    And Spencer was being retried following a
    mistrial.    But, a district court receives no less deference in a
    close case than in a clear-cut one.       In fact, it is in the close
    case that the fact that our review is for abuse of discretion
    - 25 -
    matters most.   We also agree with the government that it is hard
    to conclude anything about what might have been in the mind of
    Spencer's first jury -- let alone Spencer's second jury -- from
    the fact of the initial mistrial alone.      Thus, the fact that
    Spencer was being retried does not, at least on this record, lead
    us to conclude that we must substitute our own judgment for that
    of the District Court as to the resolution of what the District
    Court determined was a close call.3
    III.
    Spencer makes three additional challenges on appeal.   We
    consider, and reject, each in turn.
    A.
    Spencer contends, first, that the District Court erred
    in admitting certain testimony from both Keenan and Casallas that
    Spencer argues was unduly prejudicial to him.   In challenging the
    3 Spencer separately contends that his trial counsel provided
    ineffective assistance because he did not move for a mistrial or
    perhaps a voir dire of Rimkus after she testified.      But, "[w]e
    have held with a regularity bordering on the monotonous that
    ineffective assistance of counsel claims, which require a showing
    of deficient attorney performance and prejudice to the defendant,
    must originally be presented to, and acted upon by, the trial
    court . . . because an appellate court usually is ill-equipped to
    handle the fact-specific inquiry that such claims often require."
    United States v. Ofray-Campos, 
    534 F.3d 1
    , 34 (1st Cir. 2008)
    (citations omitted). Spencer presents no developed argument as to
    how, in his words, "counsel's failures in this regard are [so]
    manifestly apparent from the record" such that we should depart
    from this "well-settled rule," 
    id.,
     and so we do not consider his
    ineffective assistance claim.
    - 26 -
    decision to allow these portions of testimony at trial, Spencer
    contends that Keenan and Casallas were "fact witness[es] entitled
    to testify as to what [they] observed Spencer doing," rather than
    qualified experts under Rule 702 of the Federal Rules of Evidence,
    who would have been permitted to contextualize Spencer's behavior
    in light of their professional experience.4         In consequence,
    Spencer argues that he was prejudiced by the admission of the
    portions of Keenan's and Casallas's trial testimony in which they
    testified not merely to what they observed during the incident but
    to their own views as to why, in light of their experience, what
    they observed evidenced the committing of a "tandem" drug crime.
    Thus, Spencer contends that these portions of testimony were
    "improperly admitted under Rule 403" of the Federal Rules of
    Evidence.5
    With respect to Keenan's testimony, Spencer notes that,
    when asked whether, based on Keenan's "training and experience,"
    it was "unusual for drug dealers to work in tandem out on the
    street," Keenan responded that it was not, in fact, unusual.   And,
    4 Rule 702 provides that "[a] witness who is qualified as an
    expert by knowledge, skill, experience, training, or education may
    testify in the form of an opinion or otherwise" under certain
    specified conditions. Fed. R. Evid. 702.
    5 Rule 403 provides that the trial "court may exclude relevant
    evidence if its probative value is substantially outweighed by a
    danger of one or more of the following: unfair prejudice, confusing
    the issues, misleading the jury, undue delay, wasting time, or
    needlessly presenting cumulative evidence." Fed. R. Evid. 403.
    - 27 -
    Spencer points out, Keenan then elaborated: "[t]hey often do it
    because . . . one guy may go out and gather the customers up while
    the person having the drugs doesn't have to expose himself as
    much."
    With respect to Casallas's testimony, Spencer highlights
    the portion in which Casallas stated that he approached Spencer
    and "asked him if he was on" and then explained that being "on" is
    "street terminology usually used by drug users and drug dealers to
    determine whether the person is actually selling drugs."            Spencer
    also objects to Casallas's testimony in which Casallas stated that
    Spencer was "scanning the area, looking at cars as they drove by,"
    and   then   explained   that   he   believed,   on   the   basis   of   his
    experience, that Spencer was "doing counter-surveillance."
    Even assuming, however, favorably to Spencer, that our
    review of the District Court's evidentiary rulings with respect to
    the challenged testimony is for abuse of discretion, United States
    v. Dunston, 
    851 F.3d 91
    , 96 (1st Cir. 2017), we see none here.6
    6At trial, Spencer's counsel objected to Keenan's testimony
    as follows: "Objection, your Honor.     Relevance."   The District
    Court then overruled the objection.      Later, Spencer's counsel
    objected to the first portion of Casallas's testimony that he now
    challenges on appeal without specifying a basis for the objection,
    and was again overruled.    Spencer's counsel did not object to
    Casallas's testimony that Spencer was performing "counter-
    surveillance, although Spencer's counsel did object to Casallas's
    explanation of what Casallas meant by the term "counter-
    surveillance," and the District Court sustained that objection.
    The government contends on this basis that Spencer's challenges to
    the District Court's admission of these portions of Keenan's and
    - 28 -
    We have previously explained that opinion testimony by a witness
    who has not been qualified as an expert witness under Rule 702 may
    nevertheless be admissible under Rule 701 of the Federal Rules of
    Evidence provided that such testimony is "'rationally based on the
    perception     of    the     witness,'      [is]        'helpful      to    .    .   .   the
    determination       of   a   fact    in    issue,'       and   [is]     'not     based   on
    scientific, technical, or other specialized knowledge within the
    scope of Rule 702.'"            United States v. Santiago, 
    560 F.3d 62
    , 66
    (1st Cir. 2009) (second alteration in original) (quoting Fed. R.
    Evid. 701).    We have explained further that the touchstone for the
    admissibility under Rule 701 of such lay-opinion testimony is
    whether the testimony has the "potential to help the jury." United
    States v. Albertelli, 
    687 F.3d 439
    , 447 (1st Cir. 2012).
    Under       this      standard,       we     have     deemed        testimony
    inadmissible    "when        the    jury   can     readily       draw      the   necessary
    inferences and conclusions without the aid of the opinion." United
    States v. Etienne, 
    772 F.3d 907
    , 919 (1st Cir. 2014) (emphasis in
    original) (citations omitted). We have also explained that helpful
    testimony is typically "based on the lay expertise a witness
    personally acquires through experience, often on the job."                           United
    Casallas's testimony may be reviewed only for plain error. Because
    we conclude that the testimony is admissible even on the more
    defendant-friendly abuse-of-discretion standard, we need not
    decide whether Spencer's counsel's objections were sufficient to
    preserve the arguments he asks us to accept.
    - 29 -
    States v. Vega, 
    813 F.3d 386
    , 394 (1st Cir. 2016) (quoting United
    States v. Maher, 
    454 F.3d 13
    , 24 (1st Cir. 2006)); see also United
    States v. Ayala-Pizarro, 
    407 F.3d 25
    , 28-29 (1st Cir. 2005).                   And,
    we have noted that "a police officer noticing patterns of behavior
    across criminal operations uses straightforward logic to conclude
    a defendant's behavior fits within that pattern and thus, does not
    need to be qualified as an expert."               Vega, 813 F.3d at 394.
    Accordingly, we have upheld district court decisions to
    admit, under Rule 701, testimony from police officers "translating
    jargon common among criminals," even though not "traditional" lay
    testimony.    Albertelli, 687 F.3d at 446-47; see also Dunston, 851
    F.3d at 96 (noting that "[a]pplication of Rule 701 in the drug-
    trafficking     context    is     not    novel:    'we   have    long   held   that
    government witnesses with experience in drug investigations may
    explain   the    drug     trade    and     translate     coded    language'     for
    factfinders through lay opinion testimony" (quoting United States
    v. Rosado-Pérez, 
    605 F.3d 48
    , 56 (1st Cir. 2010))).
    Applying these principles here, we conclude that the
    District Court did not abuse its discretion in admitting the
    objected-to testimony of either Keenan or Casallas, who, we note,
    were both available for cross-examination by Spencer.                   See Vega,
    813 F.3d at 394.          The record supportably reflects that both
    officers provided testimony about their observations of Spencer's
    behavior based on their accumulated experience as police officers
    - 30 -
    who have handled many drug cases.          United States v. Valdivia, 
    680 F.3d 33
    , 50-51 (1st Cir. 2012); see also Ayala-Pizarro, 
    407 F.3d at 28
        (admitting    certain     testimony   "about    how    drug    points
    operate . . . because it was based on particularized knowledge
    that the witness had by virtue of his position as a police officer
    assigned to patrol the neighborhood" (citation and alterations
    omitted).           Specifically,     Casallas    testified       that    he     had
    "personally purchased successfully over 100 undercover drug buys"
    during his nine years as a member of the BPD's Drug Control Unit,
    while      Keenan    testified   that    he,   too,   had   spent    ten       years
    "exclusively as a drug investigator," including as an undercover
    officer.
    Moreover, the record supportably shows that Keenan's and
    Casallas's testimony was helpful to the jury in interpreting
    Spencer's actions and statements.          Casallas and Morrison testified
    about certain patterns of conduct and speech that they, on the
    basis of their experience, believed to be typical of those engaged
    in selling drugs.        That testimony included the fact that Spencer
    and Morrison were working as a team, the meaning of being "on,"
    and   Spencer's      behavior    while   Casallas     and   Morrison      actually
    executed the transaction.           Thus, as in Valdivia, we conclude that
    the challenged "testimony was not so obviously within the jury's
    bounds of knowledge as to negate all probative value."                   
    680 F.3d at 51
    .
    - 31 -
    B.
    Spencer separately contends that the prejudice to him
    from the District Court's admission of the challenged testimony
    from Keenan and Casallas "was compounded by improper comments of
    the prosecutor in his opening and closing statements," during which
    the prosecutor four times referred to Spencer as a "drug dealer"
    and thus (in Spencer's view) improperly suggested that Spencer
    "had a propensity to deal drugs."         Because Spencer did not object
    to these statements, our review is for plain error.          United States
    v. Acosta-Colón, 
    741 F.3d 179
    , 198-99 (1st Cir. 2013).                 Thus,
    Spencer must show that "(1) an error occurred (2) which was clear
    or   obvious   and   which   not   only   (3)   affected   the   defendant's
    substantial rights, but also (4) seriously impaired the fairness,
    integrity, or public reputation of [the] proceedings."                United
    States v. Kasenge, 
    660 F.3d 537
    , 541 (1st Cir. 2011) (quoting
    United States v. Duarte, 
    246 F.3d 56
    , 60 (1st Cir. 2001)).
    Spencer, however, cannot show the requisite prejudice
    from the remarks, see United States v. Kinsella, 
    622 F.3d 75
    , 84
    (1st Cir. 2010) (on plain-error review, a defendant challenging a
    prosecutor's remarks as improper must "show[] both error and
    prejudice"), even were we to assume that the prosecutor's remarks
    rise to the level of a clear or obvious error.              But see United
    States v. Wiley, 
    29 F.3d 345
    , 351 (8th Cir. 1994) (concluding that
    a prosecutor's remarks during closing argument, which referred to
    - 32 -
    the defendant as someone engaged in the "business [of] dealing
    drugs,"   "did     not     deprive     [the     defendant]     of     a     fair
    trial . . . because the jury already was aware that [the defendant]
    was on trial for distribution of cocaine base"); cf. United States
    v. Marr, 
    760 F.3d 733
    , 742-43 (7th Cir. 2014) (rejecting on plain-
    error review a defendant's challenge to a prosecutor's comments to
    the jury during closing argument, in which the prosecutor referred
    to certain transactions at issue in the case "and asked, 'what
    legitimate business does that?          What legitimate business writes
    $1.3 million to cash and to a currency exchange?'" on the basis
    that the prosecutor's comments constituted "reasonable inferences
    from the evidence adduced at trial").
    For     one     thing,     "the     fact   that    there    was     no
    contemporaneous         objection      or       request      for     curative
    instructions . . . depriv[ed] the district judge of the opportunity
    to provide special or additional instructions with regards to the
    closing statements."      United States v. Castro-Davis, 
    612 F.3d 53
    ,
    68 (1st Cir. 2010). For another, the District Court did explicitly
    instruct the jury that the arguments made to the jury during
    opening and closing argument by attorneys for the prosecution and
    defense were not evidence, and that the members of the jury "are
    the first and only judges of the facts in this case."              In light of
    our long-standing presumption that jurors follow instructions,
    United States v. Ponzo, 
    853 F.3d 558
    , 584 (1st Cir. 2017), and
    - 33 -
    against the backdrop of "the evidence presented at trial from
    multiple witnesses," "any potentially harmful effect from the
    prosecutor's closing was safeguarded by the district court's final
    jury instructions," Castro-Davis, 
    612 F.3d at
    68 (citing United
    States v. Mejía-Lozano, 
    829 F.2d 268
    , 274 (1st Cir. 1987)).
    C.
    Finally,   Spencer     takes    aim   at   the   ruling   by   the
    Magistrate Judge responsible for presiding over the initial phase
    of Spencer's case in which the Magistrate Judge denied Spencer's
    request   for   discovery   on   his     vindictive-prosecution     claim.
    Spencer agrees with the government that a defendant must "advance
    some evidence tending to establish [a] vindictive-prosecution
    claim" before he can obtain discovery.          United States v. Bucci,
    
    582 F.3d 108
    , 113 (1st Cir. 2009).          Spencer, however, contends
    that he satisfied this standard and thus that the Magistrate Judge
    erred in denying Spencer discovery.        Specifically, Spencer points
    to the fact that he provided evidence that he filed a civil suit
    against Keenan in 2006 for assault and unlawful search and arrest,
    and that "grand jury testimony" showed that "Keenan . . . directed
    [Casallas] to approach Mr. Spencer on March 20, 2013," and thus
    "singled [Spencer] out" for arrest.       Spencer further contends that
    the government's alleged Brady violation constitutes additional
    evidence tending to show a vindictive prosecution, "lend[ing]
    - 34 -
    credence       to    [Spencer's]        allegations       that    he   was    specifically
    targeted for federal prosecution based on his prior lawsuit."
    Our review of the Magistrate Judge's ruling is for abuse
    of discretion.            
    Id. at 114
    .      We find none.
    Spencer       concedes        that    he        bears    the       burden    of
    "connect[ing] any vindictive animus to those making the challenged
    charging decision in his case."                     
    Id.
     (citation omitted).                The
    government, however, emphasizes that, from all that the record
    shows,    federal         authorities       were    unaware      of    Spencer's      lawsuit
    against Keenan when they agreed to take Spencer's case from the
    Suffolk County District Attorney's Office.                       And Spencer points to
    nothing in the record that would tend to show the contrary -- let
    alone that Spencer's lawsuit against Keenan motivated federal
    authorities          to   agree    to    prosecute     Spencer.             Instead,   tying
    Spencer's Brady claim to his vindictive prosecution claim, Spencer
    offers        only    speculation,         suggesting          that    it    is     otherwise
    "inexplicable" that federal authorities would first have sought to
    try him, and later to withhold evidence from him.                                  But, such
    speculation is plainly insufficient to satisfy the standard we
    laid out in Bucci. 
    Id. at 114
     ("To obtain discovery, [a defendant]
    must     do    more       than    simply    identify       a     potential        motive   for
    prosecutorial animus."             (citation omitted)).
    Moreover,         although    the     government        admits       that   the
    particular drug transaction at issue in this case involved a small
    - 35 -
    quantity of cocaine base, the government notes that Wortmann stated
    in an affidavit -- and Spencer does not dispute -- that Spencer
    had "close to 100 entries on his Board of Probation Records" and
    had been "convicted of approximately 19 crimes going back to 1990."
    It is thus not inexplicable that federal authorities took Spencer's
    case.7
    For all of these reasons, Spencer's challenge regarding
    his vindictive prosecution claim fails.
    IV.
    For the foregoing reasons, we affirm the rulings below.
    7 We note, too, as Spencer acknowledges, that the relevant
    undisclosed evidence was not available to the Magistrate Judge at
    the time of the Magistrate Judge's ruling on Spencer's discovery
    request, and Spencer never sought to renew his motion.
    - 36 -