United States v. Sepulveda , 15 F.3d 1161 ( 1993 )


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  •                   UNITED STATES COURT OF APPEALS
    FOR THE FIRST CIRCUIT
    Nos. 92-1362
    92-1574
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    DAVID SEPULVEDA,
    Defendant, Appellant.
    No. 92-1364
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    EDGAR SEPULVEDA,
    Defendant, Appellant.
    No. 92-1366
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    EDWARD W. WELCH, JR.,
    Defendant, Appellant.
    No. 92-1367
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    ARLINE S. WELCH,
    Defendant, Appellant.
    No. 92-1369
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    KEVIN CULLINANE,
    Defendant, Appellant.
    No. 92-1371
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    CHERYL T. JOHNSON,
    Defendant, Appellant.
    No. 92-1373
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    RICHARD F. LABRIE,
    Defendant, Appellant.
    No. 92-1374
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    TONY ROOD,
    Defendant, Appellant.
    No. 92-1375
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    WILLIAM D. WALLACE,
    Defendant, Appellant.
    Nos. 92-1573
    92-1629
    UNITED STATES OF AMERICA,
    Appellee,
    v.
    ERNEST F. LANGLOIS,
    Defendant, Appellant.
    APPEALS FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF NEW HAMPSHIRE
    [Hon. Shane Devine, U. S. District Judge]
    Before
    Selya, Cyr and Boudin, Circuit Judges.
    David  H. Bownes,  with whom  David H.  Bownes, P.C.  was on
    brief, for defendant David Sepulveda.
    Julia M. Nye, with whom McKean, Mattson and Latici, P.A. was
    on brief, for defendant Edgar Sepulveda.
    Stephen A. Cherry,  with whom Wright & Cherry  was on brief,
    for defendant Edward W. Welch, Jr.
    Kevin M. Fitzgerald, with whom Peabody & Brown was on brief,
    for defendant Arline S. Welch.
    Michael J. Ryan, with whom King  and Ryan was on brief,  for
    defendant Kevin Cullinane.
    Robert P. Woodward for defendant Cheryl T. Johnson.
    Mark H. Campbell for defendant Richard Labrie.
    Paul J. Garrity on brief for defendant Tony Rood.
    Matthew J.  Lahey, with  whom Murphy,  McLaughlin, Hemeon  &
    Lahey, P.A. was on brief, for defendant William D. Wallace.
    Julie  L. Lesher,  with whom  Murphy,  McLaughlin, Hemeon  &
    Lahey, P.A. was on brief, for defendant Ernest F. Langlois.
    John  P. Rab for defendant Christopher Driesse (appellant in
    consolidated appeal).
    Paul J.  Haley, with  whom Scott L.  Hood was on  brief, for
    defendant Shane Welch (appellant in consolidated appeal).
    Kevin M. Fitzgerald, Kevin M. Leach, McLane, Graf, Raulerson
    &  Middleton, Peabody  & Brown  and  David H.  Bownes on  omnibus
    briefs for all appellants.
    Terry L.  Ollila, Special Assistant United  States Attorney,
    with whom Peter E. Papps,  United States Attorney, and Jeffrey S.
    Cahill,  Special Assistant United States Attorney, were on brief,
    for appellee.
    December 20, 1993
    SELYA,  Circuit Judge.   These appeals, arising  out of
    SELYA,  Circuit Judge.
    the  drug-trafficking  convictions  of   a  dozen  New  Hampshire
    residents, suggest  that while  two New  Hampshiremen might  once
    have been a match for Satan, see Stephen Vincent Benet, The Devil
    and Daniel Webster (1937), times have changed.  The tale follows.
    I.  BACKGROUND
    During a  two-month trial  in the  district court,  the
    government mined a golconda of  evidence.  Because it would serve
    no useful purpose to recount the occasionally ponderous record in
    book and  verse, we  offer instead an  overview of  the evidence,
    taken in the light most compatible with the guilty verdicts.  See
    United States  v. Ortiz, 
    966 F.2d 707
    , 711 (1st Cir. 1992), cert.
    denied, 
    113 S. Ct. 1005
     (1993).  Further  facts will be added as
    we discuss specific issues.
    For  almost  six  years, David  Sepulveda  conducted an
    increasingly sophisticated  cocaine distribution business  in and
    around Manchester, New Hampshire.  Initially, Sepulveda purchased
    cocaine from  a vendor in Nashua, New  Hampshire, and transported
    it  to Manchester  himself.   Over time,  Sepulveda expanded  his
    operation, increasing the  volume of cocaine and  engaging others
    to handle tasks such as pickup, delivery, and street-level sales.
    As his  enterprise grew more ambitious, Sepulveda began
    purchasing  cocaine from  a  source  in Lawrence,  Massachusetts.
    Faced with the  need to retain  control while insulating  himself
    from  the prying eyes  of law enforcement  personnel, Sepulveda's
    journeys to Lawrence became an elaborate ritual in which he would
    4
    scrupulously avoid carrying  drugs or travelling in  the same car
    with the cocaine that he purchased.  On these provisioning trips,
    Sepulveda was usually  accompanied by his  brother, Edgar, and  a
    "runner," that is, an individual who would actually transport the
    cocaine  from  Lawrence  to  Manchester.1    Frequently,  one  of
    Sepulveda's  distributors  or a  user  in a  particular  hurry to
    obtain fresh supplies would join the troupe.
    Once the cocaine arrived  in Manchester, Sepulveda  and
    his  associates  packaged  it   in  street-level  quantities  and
    distributed it to a series of individuals for resale and personal
    use.   The buyers included,  among others,  defendants Edward  W.
    Welch,  Jr., Arline  S.  Welch,  Shane  Welch,  Kevin  Cullinane,
    Christopher Driesse, Cheryl  T. Johnson, Richard E.  Labrie, Tony
    Rood, and William D. Wallace.  David Sepulveda made a practice of
    directing  persons who inquired about purchasing small amounts of
    cocaine to these same individuals.
    Eventually, David Sepulveda's reach exceeded his grasp.
    A federal  grand jury indicted  him, along with others,  for drug
    trafficking;  and, after  trial, a  petit  jury convicted  twelve
    persons,  viz.,  the  Sepulveda  brothers,  the  three   Welches,
    Cullinane, Driesse, Johnson, Labrie, Rood, Wallace, and Langlois,
    on a charge of conspiracy to possess and distribute cocaine.  See
    21 U.S.C.    846 (1988).  The jury also convicted David Sepulveda
    on a charge of engaging in a continuing criminal enterprise.  See
    1At  various times,  defendants  Tony  Rood  and  Ernest  F.
    Langlois  worked as  runners.   At  other  times, Norberto  Perez
    played this role.
    5
    21 U.S.C.   848 (1988).  Twenty-six appeals ensued.
    It  is  no  exaggeration to  say  that  the defendants,
    represented by able  counsel, managed to cultivate a profusion of
    variegated  grounds for appeal  from the  peat of  the protracted
    trial.    Because  of  the  sheer  bulk  and  complexity  of  the
    proceedings, we issued  a special briefing  order and then  heard
    oral argument on all twenty-six  appeals.  We decide today twelve
    appeals   taken    by   ten   defendants    (collectively,   "the
    appellants").2  After sifting what  grains we can locate from the
    considerable chaff,  we conclude  that the  appellants enjoyed  a
    fair, substantially error-free trial, and  that their convictions
    must  stand.   In two  instances, however,  we  vacate particular
    sentences and remand for further proceedings.
    II.  SUFFICIENCY OF THE EVIDENCE
    Four   appellants   claim   that    the   evidence   is
    insufficient,  as a matter of law, to support their convictions.3
    Because insufficiency claims are commonplace in criminal appeals,
    the   standard  of  appellate  oversight  lends  itself  to  rote
    2The  appeals taken  by defendants  Christopher Driesse  and
    Shane Welch following the trial present certain unique issues and
    those two  appeals will  be resolved in  a separate opinion.   In
    addition, after the  original round of appeals had been docketed,
    all twelve  defendants moved to  vacate judgment on the  basis of
    newly discovered evidence.   The court below denied  relief and a
    fresh  battery of  appeals ensued.    Those twelve  late-blooming
    appeals were argued in  tandem with the fourteen earlier  appeals
    and will be disposed of in a third opinion.
    3We  do not  include  under  this  rubric  appellants  Edgar
    Sepulveda and Tony  Rood, both of whom argue  that the government
    failed to present sufficient evidence to show their participation
    in  the single  "master conspiracy"  charged  in the  indictment.
    Instead, we treat with those claims in Part IX, infra.
    6
    recitation.  Following  a guilty verdict, a  reviewing court must
    scrutinize  the  record,  eschewing  credibility  judgments   and
    drawing all  reasonable inferences  in favor  of the verdict,  to
    ascertain if a rational jury could have found that the government
    proved each element of the crime beyond  a reasonable doubt.  See
    United States  v. Echeverri, 
    982 F.2d 675
    , 677 (1st  Cir. 1993);
    Ortiz, 
    966 F.2d at 711
    ; United States v. David, 
    940 F.2d 722
    , 730
    (1st Cir. 1991) (collecting cases), cert. denied, 
    112 S. Ct. 2301
    (1992).   To sustain  a conviction, the  court need  not conclude
    that only a guilty verdict  appropriately could be reached; it is
    enough  that  the finding  of  guilt  draws  its essence  from  a
    plausible reading of the record.  See Echeverri, 
    982 F.2d at 677
    ;
    Ortiz, 
    966 F.2d at 711
    .
    Here, the challenged convictions center around a charge
    of conspiracy to possess and distribute cocaine.  To prove a drug
    conspiracy  charge  under 21  U.S.C.     846,  the government  is
    obliged  to show  beyond  a reasonable  doubt  that a  conspiracy
    existed and that a particular defendant agreed to participate  in
    it, intending to commit the underlying substantive offense (here,
    possession  of cocaine  with  intent to  distribute, 21  U.S.C.
    841(a)(1)).    See David,  
    940 F.2d at 735
    ; United  States  v.
    Sanchez, 
    917 F.2d 607
    , 610 (1st Cir. 1990), cert.  denied, 
    111 S. Ct. 1625
     (1991); United States v. Rivera-Santiago, 
    872 F.2d 1073
    ,
    1079 (1st Cir.), cert. denied, 
    492 U.S. 910
     (1989).  There are no
    particular formalities that  attend this showing:   the agreement
    may  be  express  or  tacit  and  may  be  proved  by  direct  or
    7
    circumstantial evidence.  See Echeverri, 
    982 F.2d at 679
    ; Rivera-
    Santiago, 872 F.2d at 1079.   Moreover, in a criminal conspiracy,
    culpability may be constant  though responsibilities are divided;
    the government does not need to show as a precursor to  a finding
    of guilt that a given defendant  took part in all aspects of  the
    conspiracy.   See United States  v. Benevides, 
    985 F.2d 629
    , 633
    (1st Cir. 1993); United  States v. Cruz, 
    981 F.2d 613
    , 617  (1st
    Cir. 1992).  Using these guideposts, we find  that the quantum of
    evidence presented against each of the four challengers suffices.
    A.  Arline Welch.
    Four  witnesses  provided  the  bulk  of  the  evidence
    regarding Arline Welch's  role in the  conspiracy.  Kurt  Coriaty
    testified that he had purchased cocaine from her both in her home
    and  in his,  particularly after  her husband, Edward  Welch, was
    imprisoned.  Coriaty's partner, Kenneth Milne, stated that Arline
    Welch  gave  him cocaine  at  her home  and was  present  when he
    purchased  cocaine  from  Edward Welch  at  the  Welch residence.
    While mere presence is not sufficient to ground criminal charges,
    a defendant's presence at the point of a drug sale, taken  in the
    light of attendant circumstances, can constitute strong  evidence
    of complicity.  See Ortiz, 
    966 F.2d at 711-12
    .
    The  jury also heard Norberto Perez explain that Arline
    Welch  accompanied David Sepulveda on three buying expeditions to
    Lawrence,  Massachusetts.   Perez testified  that, in  expressing
    anxiety, she made  manifest her awareness of the  trips' purpose,
    voicing statements like:  "Let's hurry up and get this cocaine so
    8
    we can get out of  here."  Furthermore, Randall Vetrone testified
    that  Arline Welch  was present  in  Edgar Sepulveda's  apartment
    while  the   Sepulveda  brothers   packaged  and   sold  cocaine.
    Appellant's consensual presence in a  private home, not her  own,
    while large quantities of  drugs were being packaged for  resale,
    possessed evidentiary significance.  From this fact, coupled with
    other  contextual detail  (much  of  it  inculpatory),  the  jury
    reasonably could have inferred that she was a member of the ring.
    See Ortiz,  
    966 F.2d at 712
     (pointing out that  criminals rarely
    seek  to expose their felonious activities to innocent outsiders,
    where such  exposure could easily  be avoided); United  States v.
    Batista-Polanco,  
    927 F.2d 14
    , 18-19  (1st Cir.  1991)  (to like
    effect).
    Keeping in mind the maxim that "criminal juries are not
    expected to  ignore what  is perfectly  obvious," Echeverri,  
    982 F.2d at 679
    ,  the  testimony  of these  four  witnesses and  the
    reasonable  inferences to be drawn therefrom formed a serviceable
    predicate  upon  which to  rest  a conviction  for  conspiracy to
    distribute cocaine.4  Accordingly, the district court did not err
    in denying Arline Welch's motion for judgment of acquittal.
    B.  Kevin Cullinane.
    Daniel  Santos, a quondam partner of Cullinane's in the
    4We give short shrift to Welch's argument, echoed at various
    times by other appellants, that, because some of the government's
    witnesses anticipated receiving reduced sentences in exchange for
    cooperation,  their  testimony should  be regarded  as inherently
    unreliable.   When an appellate  court reviews the sufficiency of
    the  evidence, it must  resolve routine credibility  questions in
    favor of the verdict.  See David, 
    940 F.2d at 730
    .
    9
    drug distribution  trade, testified that Cullinane introduced him
    to  David  Sepulveda  and  that  Sepulveda  eventually  became  a
    principal   supplier   of   cocaine   to   the   Cullinane-Santos
    partnership.  Santos  also testified  that Cullinane  accompanied
    Sepulveda on provisioning trips, returning to  Santos's apartment
    with fresh supplies of contraband.  The ubiquitous Norberto Perez
    corroborated  this relationship, testifying that he had travelled
    to  Lawrence  on  at  least  five occasions  in  the  company  of
    Cullinane  and the  Sepulveda  siblings  in  order  to  replenish
    cocaine stores.   Perez also  recreated a conversation  that took
    place  between  Cullinane and  Sepulveda  involving  the former's
    indebtedness to the latter for transactions in cocaine.
    The government adduced abundant evidence that Cullinane
    distributed much of the contraband he acquired.  Perez and Santos
    both described Cullinane's  activities as  a vendor.   John  Rice
    testified   that  Cullinane   delivered   cocaine  to   defendant
    Christopher Driesse, and that Driesse,  in turn, would resell the
    drugs.  Santos confirmed that Cullinane procured these drugs from
    David  Sepulveda and that Sepulveda extended credit to Cullinane.
    Another  witness, David Chase, acknowledged that he had purchased
    up to eight kilograms of cocaine from Cullinane before concluding
    that,  aphorisms  about   honor  among  thieves  notwithstanding,
    Cullinane could not be trusted.5
    In  view of  this  plenitudinous  testimony, the  court
    5When Chase and Cullinane fell  out, Chase took his business
    directly to David Sepulveda.
    10
    below appropriately derailed Cullinane's quest for acquittal as a
    matter of law.
    C.  Ernest Langlois.
    David  Sepulveda hired  Langlois  to  be  both  a  drug
    courier  and  a torpedo.   Langlois's  resounding success  in the
    latter  role    intimidating Sepulveda's debtors  and, sometimes,
    his  associates    produced  a  suffusion  of  testimony  limning
    Langlois's role in  the organization.   For instance, David  Hill
    described four occasions on which Langlois used force, or threats
    of  force,  to  collect  debts  owed to  Sepulveda.    Two  other
    witnesses testified that Sepulveda boasted of  employing Langlois
    as a strongarm to collect  drug debts.  Another witness overheard
    Langlois  crowing about  the nature  of his  employment.   And no
    fewer  than  six  witnesses  relayed  information  from  which  a
    rational jury  could infer  that Langlois  "rode shotgun"  during
    drug-buying expeditions.
    As  this  partial   summary  indicates,  the   evidence
    accumulated  against Langlois rose well above the level necessary
    to sustain the jury's verdict.
    D.  Cheryl Johnson.
    Two witnesses, Santos and  Kathy Malone (an  undercover
    police  officer), testified  that David  Sepulveda  sent them  to
    Cheryl Johnson when they wanted to buy cocaine.  Santos said that
    he  purchased cocaine from  Johnson on approximately  one hundred
    occasions, during which transactions Johnson offhandedly revealed
    11
    the full extent of her  copious cocaine inventory.  Malone stated
    that  she purchased  cocaine from  Johnson  on three  occasions.6
    Perez  testified that  he,  too,  bought  cocaine  from  Johnson,
    delivered  cocaine  to   Johnson  at   Sepulveda's  behest,   and
    accompanied her on at least one buying trip to Lawrence.
    Although Johnson argues  vehemently that the  witnesses
    against  her were inherently  unreliable, courts must  leave such
    credibility determinations in the jury's  domain.  See David, 
    940 F.2d at 730
    .   Here,  the jury  was  at liberty  to  credit the
    testimony, and it,  in turn, supplied all  the elements necessary
    to convict.
    III.  SEQUESTRATION
    Appellants claim  that, shortly after  sentencing, they
    learned for the  first time that the government  housed three key
    witnesses (Perez, Milne, and Coriaty) in the same cell throughout
    the trial.  Appellants moved for a  new trial,7 alleging that the
    housing arrangements violated a sequestration order issued by the
    district  court.  The  government not only  contested appellants'
    conclusion but also contested the premise on which the conclusion
    6Both  Santos and  Malone also  testified  that they  bought
    cocaine from defendant Richard Labrie at Johnson's abode.
    7These motions are separate from,  and much earlier in  time
    than,  the  motions  to  which  we  alluded  in  note  2,  supra.
    Nonetheless,  these motions, like the later motions, invoked Fed.
    R. Crim.  P. 33. We  grant appellants a  considerable indulgence,
    assuming arguendo that the  information concerning the witnesses'
    living arrangements was  not discoverable before or  during trial
    with the exercise of due diligence.  See United States  v. Slade,
    
    980 F.2d 27
    , 29 (1st  Cir. 1992) (articulating standard); United
    States v. Natanel,  
    938 F.2d 302
    , 313 (1st  Cir. 1991) (similar),
    cert. denied, 
    112 S. Ct. 986
     (1992).
    12
    rested, asserting that,  though the three men  were lodged within
    the same cell block, they did not share a cell.
    For  reasons that  are  somewhat  opaque, the  district
    court  denied the motion  without a hearing  and without findings
    anent the accuracy of  appellants' "three to a cell"  allegation.
    Instead, the court  determined that, regardless of  the dormitory
    arrangements, its sequestration  order had not been flouted.   It
    is against this  rather spartan background that  we undertake our
    analysis.8
    A.  Rule 615.
    The  sanctum  sanctorum   of  supervised  sequestration
    states in its salient segment:
    At  the request  of  a party  the  court
    shall order witnesses  excluded so that  they
    cannot hear the testimony of other witnesses,
    and it may make the order of its own motion.
    Fed. R.  Evid. 615.   The rule  more or less  codifies common-law
    sequestration powers, but  it is at  once less discretionary  and
    less stringent  than its forebears.  On one hand, the rule cabins
    the judge's discretion by affording  all parties a right to close
    8To recognize that the record  sheds no light on the factual
    underpinnings of the  sequestration dispute is not to  imply that
    the  defense lacked  opportunity to  explore  the possibility  of
    sequestration  violations.    During  trial,  appellants   cross-
    examined  all three witnesses  at length, inquiring,  inter alia,
    whether they had discussed the case with others.  The examination
    elicited no  evidence that the trio traded tales concerning past,
    present, or future  testimony.  Cf. United States  v. Eyster, 
    948 F.2d 1196
    , 1210 (11th  Cir. 1991) (finding that  witnesses housed
    in  the same  cell  who admitted  discussing testimony  with each
    other violated a sequestration order).  Moreover, appellants knew
    all  along that  Perez, Milne,  and Coriaty  dwelled at  the same
    penitentiary,  yet  they  made no  specific  inquiries  about the
    congregant housing arrangement.
    13
    the  courtroom to  prospective witnesses.9   On  the other  hand,
    while  the   common  law   supported  sequestration   beyond  the
    courtroom, see 6 John Wigmore, Evidence   1840, at 471 n.7 (1976)
    (stating  that, at common law, the sequestration process involves
    three  parts:  preventing  prospective witnesses  from consulting
    each  other; preventing  witnesses  from hearing  other witnesses
    testify;  and preventing  prospective  witnesses from  consulting
    witnesses  who have already  testified), Rule 615  contemplates a
    smaller  reserve;  by  its terms,  courts  must  "order witnesses
    excluded" only from the courtroom proper, see Perry v. Leeke, 
    488 U.S. 272
    ,  281 & n.4  (1989); United States  v. Arruda,  
    715 F.2d 671
    , 684 (1st Cir. 1983).  In  sum, the rule demarcates a compact
    procedural heartland,  but leaves appreciable  room for  judicial
    innovation  beyond  the   perimeters  of  that  which   the  rule
    explicitly requires.   See United States v. De Jongh, 
    937 F.2d 1
    ,
    3  (1st  Cir.   1991)  (stating  that  district   courts  possess
    "considerable  discretion"   to  fashion  orders   pertaining  to
    sequestration).10
    9The  rule's  stringencies  in that  respect  have  not been
    adopted by all states.  See  6 John Wigmore, Evidence   1837,  at
    458  n.11 (1976);  see also  
    id. at 35
      (Supp. 1991)  (compiling
    data).    Rather,  many states  continue  to  leave sequestration
    decisions solely within the judge's  discretion.  See, e.g., R.I.
    R. Evid. 615.
    10Citing United States v. Greschner, 
    802 F.2d 373
     (10th Cir.
    1986),  cert. denied, 
    480 U.S. 908
     (1987),  appellants postulate
    that Rule 615  requires sequestration beyond the  courtroom door.
    Although Greschner does equate "circumvention" of Rule 615 with a
    violation of the  rule itself, it concedes that  controlling such
    circumvention  rests within the  district court's discretion    a
    condition that clearly  does not apply to violations  of Rule 615
    itself.    Id. at  375-76.    Thus,  Greschner fails  to  support
    14
    Outside of the  heartland, the district court  may make
    whatever provisions  it deems necessary  to manage trials  in the
    interests of  justice, see  id., including  the sequestration  of
    witnesses before, during,  and after their testimony,  see Geders
    v.  United States,  
    425 U.S. 80
    , 87  (1976), and  compelling the
    parties to present witnesses in a prescribed sequence, see United
    States  v. Machor,  
    879 F.2d 945
    , 954  (1st  Cir. 1989),  cert.
    denied, 
    493 U.S. 1094
     (1990).  Rule 615 neither dictates when and
    how this case-management power ought  to be used nor mandates any
    specific   extra-courtroom  prophylaxis,   instead  leaving   the
    regulation  of witness  conduct  outside  the  courtroom  to  the
    district judge's discretion.  See United States v. Arias-Santana,
    
    964 F.2d 1262
    , 1266 (1st  Cir. 1992) (explaining that  a federal
    trial court may  enter non-discussion orders at  its discretion);
    see  also  Arruda,  
    715 F.2d at 684
      (holding  that  there  was
    "technically"  no  violation  of  sequestration  where  witnesses
    conversed outside the courtroom).
    This  is not to say, however, that sequestration orders
    which affect witnesses outside the courtroom are a  rarity.  As a
    practical  matter,  district  courts  routinely  exercise   their
    discretion  to augment Rule 615 by instructing witnesses, without
    making  fine spatial distinctions,  that they are  not to discuss
    their  testimony.     Indeed,  such  non-discussion   orders  are
    generally  thought  to   be  a  standard  concomitant   of  basic
    sequestration fare, serving to fortify the protections offered by
    appellants' thesis.
    15
    Rule 615.  See Perry, 
    488 U.S. at 281-82
    .
    B.  Sequestration and Cohabitation.
    Here,  appellants   moved  in  advance  of   trial  for
    sequestration  without  indicating  to the  court  what  level of
    restraint they thought appropriate.  The court granted the motion
    in   its  simplest   aspect,   directing  counsel   "to   monitor
    sequestration"  and ordering "that  witnesses who are  subject to
    [the court's] order are not to be present in the courtroom at any
    time prior to  their appearance to render testimony."   At trial,
    the district court expanded its earlier order beyond the Rule 615
    minimum,  instructing each  witness at  the close  of his  or her
    testimony  not to discuss that  testimony with any other witness.
    Appellants accepted the conditions of sequestration described  by
    the court  without demurrer.  What is  more, they did not request
    any further instructions, say, that witnesses  be directed at the
    end of each  day, or  before each  recess, not  to discuss  their
    testimony.    Thus,  every  witness was  placed  under  an  order
    prohibiting discussion of the case with other witnesses only upon
    the completion of his or her testimony.
    On these facts,  the district court's denial  of relief
    must be  upheld.   The court's  basic sequestration order,  which
    ploughed a straight furrow in line with Rule 615  itself, did not
    extend beyond the  courtroom.  There has been  no intimation that
    the witnesses  transgressed this  order.   Moreover, because  the
    district  court  did   not  promulgate  a  non-discussion   order
    applicable to any witness until  the conclusion of that witness's
    16
    testimony,  Perez, Milne, and  Coriaty were under  no obligation,
    prior   to  that  moment,   to  refrain  from   discussing  their
    recollections with  each other.   Finally,  there is no  evidence
    that any of  the three ever chatted  about the case  with another
    witness after having been admonished to the  contrary   or at any
    earlier time, for that matter.
    Given this predicate, appellants' plaint reduces to the
    unprecedented proposition  that witness  cohabitation constitutes
    an automatic violation  of a standard  sequestration order.   The
    crux   of  sequestration,   however,  is   communication  between
    witnesses,  not shared  accommodations  or geographic  proximity.
    Social  settings, such as communal  housing or common work sites,
    may offer opportunities for witnesses to compare notes and gossip
    about their testimony, but  such environments do not ensure  that
    forbidden  conversations will occur.   We assume  that witnesses,
    like all other  persons subject to court orders,  will follow the
    instructions they receive.   Cf., e.g., Richardson  v. Marsh, 
    481 U.S. 200
    , 206  (1987) (reiterating the "invariable  assumption of
    the law  that jurors follow  their instructions").   We conclude,
    therefore, that  the housing arrangement,  in and of  itself, did
    not violate an existing sequestration order.
    If  doubt inhered    and we see  no room for  any   two
    other considerations would then be decisive.  In the first place,
    a district court's interpretation of its own order is customarily
    accorded great weight.  See, e.g., Witty v. Dukakis, 
    3 F.3d 517
    ,
    521  (1st Cir.  1993); Martha's  Vineyard Scuba  Hqtrs., Inc.  v.
    17
    Unidentified,  Wrecked & Abandoned  Steam Vessel, 
    833 F.2d 1059
    ,
    1066-67 (1st  Cir. 1987); Lefkowitz  v. Fair, 
    816 F.2d 17
    , 22-23
    (1st Cir. 1987).  Here,  the district court ruled that congregant
    housing of witnesses did not  infringe on the sequestration  that
    it decreed.  When a trial court's interpretation of its own order
    tracks plain language  and the  actual sequence  of events,  that
    interpretation must be honored on appeal.
    In  the  second place,  even  if  some implied  ban  on
    congregant  housing of  prisoner-witnesses existed,  breach of  a
    sequestration order would not automatically call for a new trial;
    rather,  the need  for  a sanction,  and  the nature  of one,  if
    imposable,  are  matters  committed to  the  trial  court's sound
    discretion.  See United States v.  Rossetti, 
    768 F.2d 12
    , 16 (1st
    Cir.  1985); Arruda,  
    715 F.2d at 684
    .   Appellants'  failure to
    request  a   broader  sequestration   order,  coupled  with   the
    speculative nature of their claim of actual prejudice, renders it
    impossible  to find  an abuse  of  discretion here.   See,  e.g.,
    Rossetti, 
    768 F.2d at 16
    .
    To  sum up,  our  search  of the  record  in this  case
    discloses  no  reason  to  suspect  that  the  government or  its
    witnesses  transgressed the existing sequestration order.  And as
    we   have  indicated,  if  appellants  desired  a  more  vigorous
    sequestration  regime, such  as an  edict that would  have banned
    cohabitation or  other contact  amongst prisoner-witnesses,  they
    had a  duty to ask for  it.  They failed  to do so.   Under these
    circumstances,  the  district  court  appropriately  declined  to
    18
    overturn the  convictions.  See, e.g.,  De Jongh, 
    937 F.2d at 3
    ;
    Rossetti, 
    768 F.2d at 16
    ; see also Langel v.  United States, 
    451 F.2d 957
    , 963  (8th Cir. 1971) (determining that district court's
    refusal  to  restrict  witnesses  from communicating  with  other
    witnesses,  after some had  testified, did not  constitute error;
    defendants made "no  showing . . . that  Government witnesses did
    talk to each other after testifying").
    IV.  DISPUTES ANENT DISCOVERY
    Appellants complain vociferously about the government's
    conduct during discovery.  The  complaints have a modest basis in
    fact.   Over the course  of this logistically complex  trial, the
    government   produced  a  number  of  documents  in  a  seemingly
    lackadaisical  fashion.    On each  of  these  occasions, defense
    counsel had to scramble in  order to assess the nascent discovery
    and integrate it into their  trial strategy.  On other occasions,
    the  government refused to produce documents that defense counsel
    believed were  discoverable either  as exculpatory  material, see
    Brady  v. Maryland,  
    373 U.S. 83
    , 87  (1963), or  as  fodder for
    impeachment, see  Giglio v. United  States, 
    405 U.S. 150
    , 154-55
    (1972);  see  also  18  U.S.C.     3500  (1988)   (requiring  the
    government  to  disclose,  after  direct  testimony  and  on  the
    defendant's   motion,  any  statement  by  the  witness,  in  the
    government's  possession, that relates  to the subject  matter of
    the  witness's  testimony).   We  discuss  these  two species  of
    discovery problems separately.
    A.  Delayed Discovery.
    19
    Prosecutors have  an obligation to  furnish exculpatory
    and  impeachment information to the defense  in a timely fashion.
    Although the  government's obligation goes beyond  the good-faith
    requirement  of civil  discovery, see  United  States v.  Samalot
    Perez,  
    767 F.2d 1
    , 4  (1st  Cir.  1985),  its  bounds are  not
    limitless.  Patrolling these boundaries is  primarily the duty of
    the  nisi prius  court.   Because  the district  judge is  better
    attuned to  the  nuances of  the trial,  this court  must take  a
    deferential view of rulings made in the course of that patrol.
    When discovery  material makes a belated  appearance, a
    criminal  defendant  must  ordinarily seek  a  continuance  if he
    intends to claim prejudice.   A continuance affords time to study
    the   newly   emergent   information,   consider   its   possible
    ramifications, change trial  strategy (if necessary),  assess any
    potential   prejudice,  and  determine   how  best  to   use  the
    information.  As a general rule, a defendant who does not request
    a  continuance will not  be heard to  complain on appeal  that he
    suffered prejudice as a result of late-arriving discovery.   See,
    e.g., United States v. Osorio, 
    929 F.2d 753
    , 758 (1st Cir. 1991);
    see also  United States v.  Diaz-Villafane, 
    874 F.2d 43
    ,  47 (1st
    Cir.)  (concluding, in an  analogous context, that  a defendant's
    cry of unfair surprise "is  severely undermined, if not  entirely
    undone,  by  his  neglect  to   ask  the  district  court  for  a
    continuance to  meet the  claimed exigency"),  cert. denied,  
    493 U.S. 862
     (1989).  Thus,  in situations where defense counsel does
    not  seek  a  continuance upon  belated  receipt  of discoverable
    20
    information, a court  often can assume that counsel  did not need
    more time to incorporate the information into the  defense's game
    plan.  See United States v. Ingraldi, 
    793 F.2d 408
    , 413 (1st Cir.
    1986).
    This general  rule spells  defeat for  the majority  of
    appellants' delayed  discovery claims.   In  every instance  save
    one, appellants eschewed a request  for a continuance.  They have
    never satisfactorily  explained how  delays in production  caused
    them  any  cognizable harm  on  those several  occasions  and the
    record,  which  reflects  that  appellants  assimilated  the  new
    material without  any  perceptible  hitch  and used  it  to  good
    effect,  belies  any  such  claim.    The  lack  of  demonstrable
    prejudice sounds the death knell for a "delayed discovery" claim.
    See United States  v. Devin, 
    918 F.2d 280
    , 290  (1st Cir.  1990)
    (explaining that  a defendant  who complains  about tardiness  in
    disclosure  "cannot rely on wholly conclusory assertions but must
    bear the burden of  producing, at the  very least, a prima  facie
    showing  of  a   plausible  strategic  option  which   the  delay
    foreclosed").    Hence,  we  find  appellants' delayed  discovery
    claims, with one exception, to have been waived.
    The   facts   referable  to   the   remaining  dilatory
    disclosure  claim can be  succinctly summarized.   Perez not only
    worked as a  courier for David Sepulveda, but  also supported his
    own cocaine  habit by peddling  drugs.  After he  was apprehended
    for selling cocaine,  Perez agreed to testify  against appellants
    in  return for  the United  States Attorney's  help in  seeking a
    21
    reduced sentence.   Since Perez was the only witness who tied all
    the  defendants  to  David Sepulveda's  illicit  enterprise,  his
    testimony was extremely important to the government's case.
    When  defense lawyers  began cross-examining  Perez, it
    became  apparent that  the  FBI  records  furnished  in  pretrial
    discovery  did not  list Perez's  entire  repertoire of  criminal
    convictions,   especially  those   stemming   from  state   court
    proceedings and not reported to the FBI.  When Perez acknowledged
    that a state probation officer had prepared a presentence  report
    for a New Hampshire court,  appellants asked for a continuance so
    that  they might  obtain  this document  and more  fully research
    Perez's  criminal history.  The  district court denied the motion
    but offered  to permit  the defense to  recall Perez  for further
    cross-questioning should  the new  information warrant  it.   The
    trial continued coincident  with the defense's efforts  to secure
    the presentence report.
    After some travail, New Hampshire authorities agreed to
    release the report to  the federal court in camera.  The district
    judge  found  that it  contained  little  fresh material  but  he
    nonetheless issued  a turnover order.   The defense  received the
    report while  Perez was still  on the  witness stand.   The judge
    refused to grant a mistrial  or afford appellants any  comparable
    redress.
    We see no error.  The  prosecution was caught unawares;
    it never knew of the report's existence and, therefore, could not
    have deliberately withheld it.   Furthermore, the rigors of Brady
    22
    do  not   usually  attach   to  material   outside  the   federal
    government's  control   and the presentence  report at issue here
    falls within  the scope  of this generality.   See,  e.g., United
    States v.  Aichele, 
    941 F.2d 761
    , 764  (9th Cir.  1991) (holding
    that  a  federal  prosecutor had  no  duty  to  procure materials
    prepared  for  the state  courts which  were not  otherwise under
    federal control).
    Last,  but far  from least,  delayed  disclosure claims
    cannot  succeed  unless  the   aggrieved  defendant  demonstrates
    prejudice arising  from the delay.   See  Devin, 
    918 F.2d at 290
    (refusing  to  reverse  conviction  where delayed  disclosure  of
    impeachment  material  "had no  effect  on  the  outcome  of  the
    trial"); Ingraldi, 
    793 F.2d at 411-12
     (stating  that the critical
    test "is whether defendant's  counsel was prevented by the  delay
    from  using the disclosed  material effectively in  preparing and
    presenting  the defendant's case").  Here, however, the defense's
    delayed receipt of the report did not hinder cross-examination to
    any appreciable degree.  From  the start of trial, appellants had
    a  sizeable storehouse of data concerning Perez's checkered past.
    In comparison  to  what  was  already known,  the  report,  which
    yielded  a  relatively  inconsequential   amount  of  incremental
    information, comprised small  potatoes.  Moreover, the  timing of
    events  minimized  the  possibility  of  prejudice.    Appellants
    received the report while Perez  was still testifying.  They were
    able to incorporate its contents into their cross-examination and
    employ the information effectively.   For aught that appears, the
    23
    course  and outcome  of the  trial would  have  been the  same no
    matter when the report surfaced.
    In  our  view,  the  presider's  decision  to  allow  a
    criminal case to  go forward, notwithstanding delayed  disclosure
    of  material relevant  to  impeachment of  a  witness, should  be
    upheld unless a  manifest abuse of discretion looms.   See Devin,
    
    918 F.2d at 289
    .  On this  record, we can neither  criticize the
    district court's exercise  of its informed discretion  nor tamper
    with the court's  bipartite finding that the  government violated
    no  duty  and  that,  in   any  event,  appellants  sustained  no
    cognizable  prejudice  arising out  of  the  presentence report's
    belated emergence.
    B.  Denied Discovery.
    Appellants  also complain  that the court  below, after
    scrutinizing  certain materials in camera, denied their motion to
    compel discovery.   The materials in question consist  of various
    police files, including interview notes.   We have reviewed these
    materials and  agree with the  lower court that they  are outside
    the purview of the Jencks Act, 18 U.S.C.   3500, for two reasons.
    First,  to be  discoverable  under the  Jencks Act,  a government
    record of a  witness interview must  be substantially a  verbatim
    account.  See United States v. Newton, 
    891 F.2d 944
    , 953-54 (1st
    Cir.  1989).   Second,  the  account  must  have been  signed  or
    otherwise verified by the witness  himself.  See United States v.
    Gonzalez-Sanchez,  
    825 F.2d 572
    , 586-87 (1st Cir.), cert. denied,
    
    484 U.S. 989
     (1987).  The  police files at issue here,  including
    24
    the interview notes,  do not meet either of  these guidelines and
    are, therefore, non-discoverable.  A fortiori, the district court
    did not blunder in denying access to them.
    V.  COCONSPIRATORS' STATEMENTS
    During the course  of trial, the judge  allowed several
    witnesses to  attribute out-of-court  statements to  one or  more
    declarants,   finding,  inter  alia,  that  the  declarants  were
    coconspirators.  Appellants assign error.
    Although out-of-court statements made by non-testifying
    declarants ordinarily are excluded as hearsay if offered to prove
    the truth of the matter asserted, see Fed. R. Evid. 801(c), there
    are exceptions  to the rule.  One such exception provides that "a
    statement by a coconspirator of a  party during the course and in
    furtherance  of the  conspiracy" is  not hearsay.   Fed.  R. Evid
    801(d)(2)(E).   To  invoke the  exception, a  party who  wants to
    introduce  a particular statement must show by a preponderance of
    the evidence that  a conspiracy embracing both  the declarant and
    the  defendant  existed,  and  that  the  declarant  uttered  the
    statement  during and  in  furtherance of  the  conspiracy.   See
    Bourjaily  v. United States, 
    483 U.S. 171
    , 175-76 (1987); Ortiz,
    
    966 F.2d at 714-15
    .  The party at whom the evidence is aimed must
    object to the statement when it is offered; and,  if the district
    court accepts  the evidence de bene,  must then ask  the court at
    the close of  all the relevant evidence to  strike the statement,
    i.e., to consider  whether the proponent fulfilled  the requisite
    foundational requirements  by  a preponderance  of the  evidence.
    25
    See Ortiz,  
    966 F.2d at 715
    ;  United States v.  Perkins, 
    926 F.2d 1271
    , 1283  (1st  Cir.  1991);  see generally  United  States  v.
    Ciampaglia, 
    628 F.2d 632
    , 638  (1st Cir.), cert. denied, 
    449 U.S. 956
     (1980);  United States v.  Petrozziello, 
    548 F.2d 20
    ,  23 n.3
    (1st Cir. 1977).
    On five occasions,  at least one defendant  objected to
    testimony  anent coconspirators'  out-of-court statements.11   We
    treat  these  objections as  fully  preserved    after  all,  the
    district court  told counsel that  it deemed an objection  by one
    defendant sufficient to  preserve the rights of  all defendants
    and, accordingly, we  plumb the record in an  effort to determine
    whether any or  all of the district court's  rulings with respect
    to these statements were clearly erroneous.  See United States v.
    McCarthy, 
    961 F.2d 972
    ,  977 (1st Cir.  1992); United  States v.
    Cresta, 
    825 F.2d 538
    , 551 (1st Cir. 1987), cert. denied, 
    486 U.S. 1042
     (1988).
    We  begin  by  considering three  pieces  of  testimony
    recounting out-of-court statements.  The common thread that joins
    these proffers is that the government adduced some other evidence
    tending   to   prove   that  the   declarants   were,   in  fact,
    coconspirators.  We then address two pieces of testimony that are
    not cushioned in a comparable fashion.
    A.  Supported Statements.
    11On a sixth occasion, defendant Driesse objected to another
    statement.   Inasmuch as that statement implicated Driesse alone,
    we regard the  ensuing assignment of error as beyond the scope of
    this opinion.  See supra note 2.
    26
    1.     Milne  Testimony.     Milne  (a   self-confessed
    1.     Milne  Testimony.
    coconspirator) served as  the wellspring of the  first statement.
    He testified  that a defendant,  Edward Welch, told him  that the
    police  noticed cocaine  on his  (Welch's) bed  in the  course of
    executing a  search warrant.   The district court found  that the
    declarant, Welch, was a coconspirator, and that Welch's statement
    was  made during  and  in  furtherance of  the  conspiracy.   The
    finding is fully sustainable.
    Both Coriaty and  Milne testified that Welch  sold them
    cocaine he  had purchased  from David  Sepulveda (an  arrangement
    that  numerous  other  witnesses  corroborated).   This  evidence
    encourages,  if it  does not  demand, the  conclusion  that Welch
    worked hand  in glove with  Sepulveda.   A pattern of  drug sales
    between  two individuals, looking toward resale to third persons,
    together  with  appropriate  contextual  detail,  can  support  a
    finding that the two individuals were jointly involved in a drug-
    trafficking conspiracy.   See  United States  v. Moran,  
    984 F.2d 1299
    , 1303 (1st Cir. 1993); United States v. Glenn, 
    828 F.2d 855
    ,
    857-58  (1st  Cir. 1987).    The  record likewise  justifies  the
    conclusion that Welch's statements to Milne were made  during and
    in furtherance of the conspiracy.  We think it is common ground
    and common  sense   that  the reporting of significant  events by
    one coconspirator to another advances the conspiracy.  See United
    States v. Smith, 
    833 F.2d 213
    , 219 (10th Cir. 1987).
    2.  Rice  Testimony.  Another government  witness, John
    2.  Rice  Testimony.
    Rice, testified  that one  defendant, Driesse,  mentioned that  a
    27
    second  defendant, Rood, sold cocaine for the Sepulveda brothers.
    The jury  found both  Driesse and Rood  guilty of  the conspiracy
    charge,  and the  record gives  considerable  definition to  both
    men's links to the drug ring.   And, moreover, since the  sharing
    of pertinent information  about a conspiracy's mode  of operation
    furthers  the conspiratorial ends,  see United States  v. Munson,
    
    819 F.2d 337
    , 341 (1st Cir. 1987), Driesse's statement concerning
    drug sales  assisted the  charged conspiracy  by informing  other
    coconspirators of Rood's role and activities.
    3.    Malone Testimony.    A  third statement  came  in
    3.    Malone Testimony.
    through  a police  officer, Kathy  Malone, who  made a  number of
    undercover  buys from Sepulveda-supplied  vendors.  She testified
    that David Sepulveda's inamorata, Bambi Burley, told her that she
    (Bambi) had  jilted Sepulveda and  asked whether Malone  might be
    "one of those girls that went to  New York with him."  Appellants
    challenge the admission of this statement on the sole ground that
    Burley,  herself, was  a  stranger  to  the  charged  conspiracy.
    However,  this  challenge  overlooks  Perez's testimony  that  he
    collected drug debts for David  Sepulveda and delivered the money
    to  Burley.   While  there  is  hardly  a profusion  of  evidence
    depicting Burley as a coconspirator, there is enough to withstand
    clear error review.12
    12It seems  problematic whether  these statements  furthered
    the  conspiracy.   We need  not mull  this question,  however, as
    appellants did not advance this  ground either in the lower court
    or in their briefs.  The issue is, therefore, waived.  See United
    States v. Slade, 
    980 F.2d 27
    , 31 (1st Cir. 1992).  In all events,
    the statements seem harmless.
    28
    B.  Unsupported Statements.
    The two additional  instances in which the  court below
    admitted  statements  under the  coconspirator  exception despite
    contemporaneous objection are  qualitatively different.  In  each
    instance, there appears to be  no record evidence, other than the
    statement itself, to support its admissibility.
    One statement arose during the government's examination
    of  a police  detective, Mark  Putney.   The detective  testified
    that, while executing a search  warrant at a dwelling occupied by
    defendant Cheryl Johnson and her  husband, Brian, he answered the
    telephone:
    The  male caller asked if  Brian was home.  I
    stated  I was Brian.   The caller  stated did
    you pick  up the stuff.   I said I did.   The
    caller asked if  he could come over  and pick
    up a half.  I stated sure, come on over.
    The other statement occurred  during direct examination
    of  Joseph  Baranski.    Baranski  testified  that  he  sometimes
    provided  transportation for  people going  to David  Sepulveda's
    house and that,  on occasion, his passengers would  tell him that
    they were  visiting Sepulveda  because "they  wanted to  buy some
    drugs."
    Our  review of the  record has deterrated  no extrinsic
    evidence  tending to show that these out-of-court declarants (the
    unidentified caller to the Johnson residence and the unidentified
    passengers   in  Baranski's   vehicle)  were   involved  in   the
    conspiracy, and the government has  directed us to no such proof.
    Following  the Supreme Court's landmark opinion in Bourjaily, and
    29
    Justice Stevens's concurrence, 
    483 U.S. at
    185 & n.2, several of
    our  sister circuits  have concluded  that  the preponderance  of
    evidence  required  for  the   introduction  of  an  out-of-court
    statement under Rule 801(d)(2)(E) must  necessarily comprise more
    than  the weight  of the  statement  itself.   See, e.g.,  United
    States  v. Gambino,  
    926 F.2d 1355
    ,  1361 n.5  (3d Cir.),  cert.
    denied, 
    112 S. Ct. 415
     (1991); United States v. Garbett, 
    867 F.2d 1132
    , 1134 (8th Cir. 1989);  United States v. Silverman, 
    861 F.2d 571
    , 577  (9th Cir.  1988); United States  v. Zambrana,  
    841 F.2d 1320
    , 1344-45  (7th Cir. 1988);  see also United States  v. Daly,
    
    842 F.2d 1380
    , 1386 (2d Cir.), cert. denied, 
    488 U.S. 821
     (1988).
    We have not yet spoken to the point.  See, e.g., United States v.
    Dworken, 
    855 F.2d 12
    , 25 (1st Cir. 1988) (deferring resolution).
    This case presents the issue squarely and requires that
    we decide it.  We hold that a coconspirator's statement, standing
    alone, is insufficient to meet the preponderance standard of Rule
    801(d)(2)(E).   In  other words,  to  satisfy the  weight-of-the-
    evidence criteria for that hearsay exception, there must be  some
    proof  aliunde.    Though  the  district  court  may  consider  a
    statement's  contents   and  the   circumstances  attending   its
    utterance  when gauging  the statement's reliability,  see United
    States v.  Gomez-Pabon, 
    911 F.2d 847
    , 856  n.3 (1st  Cir. 1990),
    cert. denied,  
    498 U.S. 1074
     (1991), admitting the statement into
    evidence  requires  some  extrinsic   proof  of  the  declarant's
    involvement  in the  conspiracy.   Thus,  because the  government
    developed  no independent evidence of who Brian Johnson's callers
    30
    or Joseph  Baranski's passengers might  have been, or  what their
    status  might have  been vis-a-vis  the  charged conspiracy,  the
    statements  were  improperly  admitted  under  the  coconspirator
    exception to the hearsay rule.13
    There   is  no  bright-line   rule  for  divining  when
    particular errors that  result in a  jury's exposure to  improper
    evidence are  (or  are not)  harmless.   Rather,  a  harmlessness
    determination   demands   a  panoramic,   case-specific   inquiry
    considering,  among other things,  the centrality of  the tainted
    material, its  uniqueness, its  prejudicial impact,  the uses  to
    which it was put during the trial, the relative  strengths of the
    parties'  cases,  and any  telltales  that furnish  clues  to the
    likelihood that the error affected the factfinder's resolution of
    a  material issue.   Gearing  our inquiry  along these  lines, we
    conclude that the errors in admitting  the statements are benign.
    The  telephone  talk  concerned a  peripheral  matter,  for Brian
    Johnson  was  not  on  trial.    Furthermore,  several  witnesses
    testified at first  hand that his  wife and housemate,  appellant
    Cheryl Johnson,  trafficked in  cocaine.   See supra  Part II(D).
    The passengers'  remarks constituted cumulative  evidence.   They
    13We  do not mean to imply  that the evidence might not have
    been introduced for  some other purpose.   Suppose, for  example,
    that the telephone calls Putney received were not offered to show
    that someone in fact sought to buy drugs from Brian Johnson, but,
    rather,  to  show  the  types  of telephone  calls  the  Johnsons
    received.  If admissible on  that basis, the statements would not
    be excludable as  hearsay.  See  Fed. R. Evid.  801(c); see  also
    United  States  v.  Green,  
    887 F.2d 25
    ,  27  (1st  Cir.  1989)
    (upholding  admission of out-of-court  statement to  show motive,
    not for the truth of the matter asserted).
    31
    inculpated only David Sepulveda, and a googol of witnesses tabbed
    Sepulveda  as  a  large-scale   narcotics  distributor  who  made
    countless  cocaine sales.  Several  of these witnesses swore that
    they  personally purchased drugs  from him.   Against  this tidal
    wave  of  evidence,  Baranski's  testimony  was  a  drop  in  the
    proverbial bucket.   Because  the record  offers every  assurance
    that  the errant statements  did not affect  the trial's outcome,
    they were harmless.14  See  United States v. Ladd, 
    885 F.2d 954
    ,
    957-58 (1st Cir. 1989); Dworken, 
    855 F.2d at 26
    .
    VI.  EXPERT TESTIMONY
    At  trial,  the  government's  case culminated  in  the
    testimony of Commander  Richard Gerry of  the New Hampshire  Drug
    Task Force.   Before  Commander Gerry  testified, the  prosecutor
    told the  court that Gerry's views would  be based upon the trial
    testimony and his experience  as a police officer,  and predicted
    that Gerry would "explain to the jury how the quantities of drugs
    . . . referred to in the . . . testimony at trial [were] used and
    distributed  . .  . from  the business  aspect."   Based  on this
    representation, the court denied appellants' motion in limine and
    permitted the witness to testify.
    14Appellants  also assign error to four statements that were
    admitted without objection.  Absent a showing of plain error, the
    failure  to object  below  is  fatal  to claims  that  particular
    evidence should not have reached  the jury.  See Ortiz,  
    966 F.2d at 715
    ; Perkins, 
    926 F.2d at 1283
    ; see also Fed. R. Evid. 103(a).
    We find  no plain error in  connection with the admission  of the
    four  statements; their introduction, whether viewed singly or in
    combination, did not  "seriously affect the fundamental  fairness
    and basic integrity  of the [trial],"  United States v.  Griffin,
    
    818 F.2d 97
    , 100 (1st Cir.),  cert. denied, 
    484 U.S. 844
      (1987),
    or otherwise impair appellants' substantial rights.
    32
    In  the initial stages, the testimony went according to
    plan:  Commander  Gerry discussed the ways in  which drug dealers
    commonly package their products and reviewed the economics of the
    cocaine trade (illustrating the profit to be gained by buying and
    selling  in various quantities).   Despite this  promising start,
    matters  soon deteriorated.    Although Commander  Gerry  offered
    opinions   as   to   appellants'   roles   in   the   enterprise,
    characterizing David  Sepulveda as  "top dog"  and the  others as
    rank-and-file  members  of  the  organization,  cross-examination
    revealed that  these opinions  were less the  fruit of  an expert
    mind  attuned to  the  testimony in  the case  than the  yield of
    undifferentiated conversations over  the years with  unidentified
    police  officers  regarding  Sepulveda and  his  associates.   So
    ingrained were  the roots of  Commander Gerry's opinions  that he
    was unable to specify the sources  of his information or, in  the
    end, articulate a plausible basis for his views.  The speculative
    nature  of Gerry's  testimony became  starkly  apparent when  the
    defense established that he had heard only bits and pieces of the
    testimony  in the  case.   These rather  startling insights  cast
    grave doubt  upon both  the adequacy of  the foundation  on which
    Gerry's testimony rested  and the existence of a fair opportunity
    for effective cross-questioning.
    Midway through  cross-examination the defense  moved to
    strike  the  expert's  testimony in  toto.    The district  court
    granted  the  motion.   We  think  the  defects in  the  expert's
    presentation warranted this step.   Fed. R. Evid. 705 provides in
    33
    pertinent part  that an expert witness "may .  . . be required to
    disclose  [on cross-examination] the underlying facts or data" on
    which  his opinions rest.   If cross-examination reveals that the
    opinions  advanced  by  an  expert rest  on  a  wholly inadequate
    foundation,  the  judge,   on  timely  motion,  may   strike  the
    testimony.  See, e.g., United States v. Scop, 
    846 F.2d 135
    ,  142-
    43 (2d Cir. 1988); Benjamin  v. Peter's Farm Condo. Owners Ass'n,
    
    820 F.2d 640
    , 641 (3d Cir. 1987); see also 3 David W. Louisell et
    al., Federal Evidence   400, at 709-10 (1979).
    The district judge also told  the jury to disregard the
    offending testimony "entirely."  His instruction was firm, clear,
    and to  the point.  Appellants  neither objected to  its form nor
    sought to have the judge improve upon it.  The next day, however,
    appellants moved  for a mistrial.   The judge denied  the motion.
    On appeal, appellants  lament the denial  of both their  original
    motion in limine and their subsequent motion for a mistrial.
    A.  The Motion in Limine.
    The admission of  expert testimony is governed  by Fed.
    R. Evid. 702,  which authorizes the district court  to admit such
    testimony if, and to  the extent that, it will  "assist the trier
    of fact  to understand  the evidence  or to  determine a  fact in
    issue  .  .  . ."    
    Id.
       Because  gauging  an  expert witness's
    usefulness  is almost  always a  case-specific  inquiry, the  law
    affords trial  judges substantial  discretion in  connection with
    the admission or  exclusion of opinion evidence.   See Apostol v.
    United States, 
    838 F.2d 595
    , 599 (1st Cir.  1988); United States
    34
    v. Hoffman, 
    832 F.2d 1299
    , 1310 (1st Cir. 1987); see also  3 Jack
    Weinstein & Margaret A. Berger, Weinstein's Evidence   702[02] at
    702-22 to 702-23 (1993).  It follows that a trial judge's rulings
    in  this sphere should  be upheld "unless  manifestly erroneous."
    Salem v. United  States Lines Co.,  
    370 U.S. 31
    , 35 (1962);  see
    also Hoffman, 
    832 F.2d at 1310
     (explaining  that "the  district
    court's assessment of what  will or will not  assist the jury  is
    entitled to considerable deference in the Rule 702 milieu").
    Given the government's  preliminary proffer, there  was
    no need for outright exclusion of the anticipated testimony.  The
    Supreme Court has recently reaffirmed that when a  party proffers
    an  expert,  the  trial judge  performs  a  gatekeeping function,
    determining  whether  it  is reasonably  likely  that  the expert
    possesses specialized  knowledge  which  will  assist  the  trier
    better to understand a fact in issue.  See Daubert v. Merrell Dow
    Pharmaceuticals, Inc.,  
    113 S. Ct. 2786
    ,  2796  (1993).    The
    witness's opinions need  "not [be] based on  first-hand knowledge
    or observation."  
    Id. at 2796
    .
    Seen  in light of these authorities, the district court
    had  a reasonable basis for  allowing the expert  to testify.  If
    Commander  Gerry's pedagogy  proved  to  be  as  advertised,  his
    testimony  arguably would have assisted the jury in understanding
    the   voluminous  evidence   that  had   emerged.     Experienced
    investigators are  commonly permitted  to testify  as experts  on
    topics  such  as the  structure  of  a  criminal enterprise,  the
    economics  of the  drug trade,  and the  handling of  contraband.
    35
    See, e.g., United States v.  Angiulo, 
    897 F.2d 1169
    , 1188-89 (1st
    Cir.) (allowing veteran FBI agent to offer opinions, based mainly
    on information  presented at  trial, about  defendants' roles  in
    gambling ring), cert. denied, 
    498 U.S. 845
     (1990); Ladd, 
    885 F.2d at 959
     (allowing  experienced police  officer  to testify  about
    methods of packaging  and processing heroin, and  relationship to
    distribution  venture); United States  v. Angiulo, 
    847 F.2d 956
    ,
    973-75  (1st Cir.) (allowing suitably credentialed agent to offer
    expert opinions about structure and operation of La Cosa  Nostra,
    including defendants' relationships  to that organization), cert.
    denied, 
    488 U.S. 928
     (1988);  Hoffman, 
    832 F.2d at 1310
     (allowing
    knowledgeable federal  agent  to  testify as  an  expert  on  the
    practices and idiom of the cocaine community).
    In  sum, the  lower  court's denial  of  the motion  in
    limine cannot be  faulted.  The unhappy fact  that, in hindsight,
    the expert turned out  to be a dud does not  retroactively negate
    the lawfulness  of the  court's original  ruling.   Trial judges,
    whose lot is often to make swift battlefield decisions on tangled
    evidentiary  matters, cannot be  expected to foretell  the future
    with absolute accuracy.15
    B.  The Motion for Mistrial.
    15When  uncertainty attends a  proffer of  opinion evidence,
    voir dire screenings are standard  fare.  See, e.g., Tokio Marine
    & Fire Ins. Co. v. Grove Mfg. Co., 
    958 F.2d 1169
    , 1175 & n.4 (1st
    Cir. 1992);  Freeman v.  Package Mach. Co.,  
    865 F.2d 1331
    , 1337
    (1st Cir. 1988); cf. United  States v. Griffin, 
    818 F.2d 97
    ,  105
    (1st Cir.)  (discussing  utility of  voir  dire in  an  analogous
    context), cert.  denied,  
    484 U.S. 844
      (1987).    But  although
    appellants moved  in limine  to forfend  Gerry's testimony,  they
    apparently never sought permission to conduct a voir dire.
    36
    Appellants'  next   assignment  of  error   presents  a
    slightly closer  question.   Although the  district court  struck
    Commander Gerry's half-completed testimony and told the jurors to
    disregard what they had heard,  appellants assert that the  court
    erred  in  refusing  to  grant  a  mistrial.    At  the  core  of
    appellants' argument lies their insistence that  the judge did no
    more  than hold a farthing candle to  the sun; once Gerry's views
    were aired,  words from the  bench, no matter how  stentorian the
    judge's tone, could not exorcise the resultant prejudice.
    Granting or denying a motion for a mistrial is a matter
    committed to  the trial  court's discretion.   See De  Jongh, 
    937 F.2d at 3
    ; United  States v. Chamorro, 
    687 F.2d 1
    ,  6 (1st Cir.),
    cert.  denied,  
    459 U.S. 1043
      (1982).    The exercise  of  that
    discretion always  must be informed  by the circumstances  of the
    particular case.   When, as now, a  motion to declare  a mistrial
    has its genesis in a claim that improper evidence came before the
    jury, the court must first weigh the claim of impropriety and, if
    that claim is well founded, strike the offending evidence.  Next,
    unless   the  court  believes  that  the  evidence  is  seriously
    prejudicial   and  that  a   curative  instruction  will   be  an
    insufficient  antidote, the court  should proceed with  the trial
    after instructing the jury to disregard the  evidence.  Declaring
    a mistrial is  a last resort, only to be implemented if the taint
    is ineradicable, that  is, only if the trial  judge believes that
    the jury's  exposure to  the evidence is  likely to  prove beyond
    realistic hope of repair.
    37
    In this  instance, Judge  Devine followed the  standard
    paradigm as closely as possible, considering appellants' delay in
    offering the mistrial motion.   Three factors persuade us that he
    handled  the situation in  an appropriate manner.   First, courts
    have long recognized that, within wide margins, the potential for
    prejudice stemming  from improper  testimony or  comments can  be
    satisfactorily  dispelled by  appropriate curative  instructions.
    See, e.g.,  United States v.  Figueroa, 
    900 F.2d 1211
    ,  1216 (8th
    Cir.),  cert. denied,  
    496 U.S. 942
      (1990); United  States  v.
    Ferreira,  
    821 F.2d 1
    , 5-6  (1st  Cir. 1987);  United States  v.
    Cirrincione, 
    780 F.2d 620
    , 635 (7th Cir. 1985).  The instructions
    given here pass  the test of appropriateness;  indeed, appellants
    have  not  suggested  any  way  in which  they  might  have  been
    improved.
    Second, Judge  Devine did  not allow  sores to  fester.
    Rather,  he halted Commander  Gerry's testimony in  midstream and
    instructed the jurors to discard  the faulty evidence.  Swiftness
    in  judicial  response  is an  important  element  in alleviating
    prejudice once the  jury has been exposed  to improper testimony.
    See,  e.g., United  States v.  Pryor, 
    960 F.2d 1
    , 2-3  (1st Cir.
    1992); United  States v. Hernandez,  
    891 F.2d 521
    , 523  (5th Cir.
    1989), cert.  denied, 
    495 U.S. 909
     (1990).   In  this case,  the
    judge could scarcely have acted more celeritously.
    Third,    appellate   courts    inquiring   into    the
    effectiveness  of  a trial  judge's curative  instructions should
    start  with  a  presumption  that jurors  will  follow  a  direct
    38
    instruction  to disregard  matters  improvidently brought  before
    them.  See  United States v. Olano, 
    113 S. Ct. 1770
    , 1781 (1993);
    Richardson, 
    481 U.S. at 206
    .  Though rebuttable, the presumption
    endures  unless it appears  probable that, in  a particular case,
    responsible jurors will not  be able to put the testimony  to one
    side, and, moreover, that the testimony  will likely be seriously
    prejudicial to the aggrieved party.   See United States v. Paiva,
    
    892 F.2d 148
    , 160 (1st Cir. 1989) (collecting cases).
    Read as a whole,  Commander Gerry's partially completed
    testimony does  not strike  us as so  compelling that  its impact
    would linger  even  after  the  court's stern  admonition.    The
    testimony is virtually  indistinguishable from the vast  array of
    other  evidence introduced by the prosecution, and, therefore, it
    is  of  the  cumulative  vintage.16    We  have  routinely  found
    cumulative evidence  impotent when  accidentally uncorked.   See,
    e.g., United States v. Ellis, 
    935 F.2d 385
    , 393 (1st Cir.), cert.
    denied, 
    112 S. Ct. 201
     (1991); United States v. Morris, 
    700 F.2d 427
    , 431 (1st Cir.), cert. denied, 
    461 U.S. 947
     (1983).  So it is
    here.   Appellants have not successfully rebutted the presumption
    that the jury heeded the judge's instructions.
    In a last-ditch effort to save the day, appellants come
    at the question  of undue prejudice from a  slightly more oblique
    16It  is,  perhaps,  worth noting  that  the  only defendant
    discussed in  any detail by the  witness was David Sepulveda    a
    defendant   as  to  whom  the  prosecution  adduced  overwhelming
    evidence of  guilt.  We  add that, although there  were different
    quanta of evidence as to  each defendant, a painstaking review of
    the  record inspires  confidence that  Gerry's  testimony had  no
    significant spillover effect vis-a-vis other defendants.
    39
    angle.     They  allege  that  the  government's  questioning  of
    Commander Gerry went  so far beyond the limits  of propriety that
    putting  him on  the  witness  stand  amounted  to  prosecutorial
    misconduct.    But  the  record  simply  does  not  support  this
    accusation.  The government  had a reasonable basis for  offering
    Gerry as an expert  witness.  Although  the decision did not  pan
    out, that is no  reason to consign either  the prosecutor or  the
    prosecution to the juridical equivalent of  philotheoparoptesism.
    Like judges,  prosecutors cannot be  held to a standard  of utter
    prescience.17
    For these reasons, we discern no abuse of discretion in
    either  the  district  court's  initial  admission  of  Commander
    Gerry's  testimony or the  court's refusal to  declare a mistrial
    after  the  necessity  to  strike  the testimony  arose.    In  a
    nutshell, there was no reason to  believe that the infelicitously
    offered evidence  remained  in the  jurors'  minds after  it  was
    banished from the case, and,  consequently, no need for the court
    to jettison the baby when the bath water turned tepid.
    VII.  CLOSING ARGUMENT
    Appellants  contend  that   the  prosecutors'  comments
    17Moreover,  if blame  is to  be  assigned, appellants  must
    share in it.  They could have,  but did not, ask for a voir dire.
    See supra note 15.   A party who elects not to  request voir dire
    of an opponent's  expert runs certain risks.   When a predictable
    risk materializes,  there is little  incentive for  courts to  be
    sympathetic.    Cf., e.g.,  Paterson-Leitch Co.  v. Massachusetts
    Mun.  Wholesale Elec.  Co., 
    840 F.2d 985
    , 989  (1st Cir.  1988)
    ("Courts, like the Deity, are most frequently moved to help those
    who help themselves.").
    40
    during closing argument constituted reversible error because some
    statements spotlighted appellants' joint  decision not to testify
    and others  unfairly inflamed  the jury's  passions.18   Although
    these  contentions  are   obviously  related,  we  analyze   them
    separately.
    A.  Comments on Defendants' Silence.
    We begin with bedrock.  The Fifth Amendment forbids any
    comment  by the  prosecutor on  the defendant's  exercise of  the
    right  to remain silent.  See United States v. Robinson, 
    485 U.S. 25
    , 30 (1988);  Griffin v. California, 
    380 U.S. 609
    , 615 (1965).
    The proposition is more easily stated than applied.   There is no
    bright line marking the precipice between a legitimate assessment
    of defense witnesses  and an impermissible encroachment  upon the
    accused's silence.  Prosecutors who choose to explore such rugged
    terrain must  take particular care  not to comment upon,  or call
    the  jury's  attention to,  a  defendant's  failure  to take  the
    witness stand.  See  United States v.  Lavoie, 
    721 F.2d 407
    ,  408
    (1st Cir.  1983), cert. denied, 
    465 U.S. 1069
     (1984); Rodriguez-
    Sandoval v. United States, 
    409 F.2d 529
    , 531 (1st Cir. 1969).
    Nonetheless, the road runs in both directions,  leading
    to a  rough mutuality  of obligation.   Defense attorneys  have a
    responsibility to  exercise reasonable  vigilance and direct  the
    trial court's immediate  attention to perceived trespasses.   See
    generally Ortiz, 
    966 F.2d at 715
      (pointing out that  "attorneys
    18We  use "prosecutors" in the plural because one government
    attorney delivered  the  initial summation  and  another  handled
    rebuttal.
    41
    must  usually   bear  the  responsibility  for  preserving  their
    points"); United States  v. Griffin, 
    818 F.2d 97
    ,  100 (1st Cir.)
    (discussing the "obligation to alert the district judge to error-
    in-the-making"), cert.  denied, 
    484 U.S. 844
      (1987).   Although
    excessive  summations  may  on  rare  occasions constitute  plain
    error,  redressable after the fact notwithstanding the absence of
    a  contemporaneous  objection,  see,  e.g.,  Arrieta-Agressot  v.
    United  States, 
    3 F.3d 525
    ,  528 (1st  Cir.  1993), a  criminal
    defendant  who believes that a prosecutor's closing argument goes
    too far must usually object  to the offending statements when and
    as they are  uttered.  See 
    id.
      In this  way, the prosecution can
    clarify  ambiguities and correct mislocutions in a timely manner,
    and,  if necessary, the  trial judge can  administer an immediate
    antidote, thereby curtailing any damage.
    None of the appellants chose to testify at trial.  Yet,
    the prosecutors courted trouble in both segments of their closing
    argument.  Initially, one of them asked rhetorically:
    Did anyone come  into this courtroom and  say
    what the Government witnesses told you didn't
    happen?    Did  they?    They   attacked  the
    witnesses, the DEA, the police officers, [and
    the government attorneys]. . . .
    On rebuttal, her colleague expanded upon (and twice repeated) the
    same theme:
    The  United   States  introduced  a   lot  of
    evidence during  this trial, a  lot of facts.
    And for the  most part, there is  no evidence
    in  this case to show that what our witnesses
    said happened did  not happen.  That  is, the
    defendants  have  done little  or  nothing to
    refute that evidence.
    42
    *        *        *
    Ladies  and   gentlemen,  we  stand   on  the
    evidence,  the  overwhelming   evidence,  the
    evidence  which,  for  the   most  part,  the
    defendants  have done  absolutely nothing  to
    refute . . . .
    It was only  after the jury had  been dismissed for the  day that
    appellants, having sat  silently throughout both segments  of the
    prosecutors'  summations, moved for  a mistrial based  in part on
    the  quoted statements.   The  trial court  denied the  motion as
    untimely and sent the case to the  jury the next morning.  In the
    course  of  the charge,  Judge  Devine  stated on  five  separate
    occasions  that the government  was responsible for  carrying the
    burden  of proof,  that the  defendants had  the right  to remain
    silent,  and  that  no  inferences   might  be  drawn  from   the
    defendants' election not to testify.19
    In  assaying  the  appropriateness  of  a  prosecutor's
    remarks,  context  frequently  determines meaning.    See,  e.g.,
    United States v.  Young, 
    470 U.S. 1
    , 11  (1985); United States v.
    Akinola, 
    985 F.2d 1105
    , 1111  (1st Cir. 1993); United  States v.
    Lilly, 
    983 F.2d 300
    , 307 (1st Cir. 1992).   Once the prosecutor's
    words are  placed in context,  we inquire  whether "the  language
    used was  manifestly intended or  was of such character  that the
    jury  would naturally and necessarily take  it to be a comment on
    19To be sure, the judge did not specifically direct the jury
    to disregard the comments quoted above.   Yet, appellants neither
    sought such an instruction nor objected to its  absence.  A trial
    court's  failure to launch  a limiting instruction  sua sponte is
    not  reversible error.  See,  e.g., United States  v. De La Cruz,
    
    902 F.2d 121
    ,  134 (1st Cir. 1990); Rivera-Santiago,  872 F.2d at
    1083.
    43
    the failure of the accused to testify."  United States v. Glantz,
    
    810 F.2d 316
    , 322 (1st Cir.)  (citations omitted), cert. denied,
    
    482 U.S. 929
     (1987);  see also  Lilly, 
    983 F.2d at 307
    .20   In
    borderline  cases, the standard of review can figure importantly.
    When  no contemporaneous objection  appears of  record, appellate
    review is for plain error.  See Arrieta-Agressot, 
    3 F.3d at 528
    ;
    United States v. Smith,  
    982 F.2d 681
    , 682  (1st Cir. 1993);  see
    also  Fed.  R.  Crim.  P.  52(b).    And  in  the  absence  of  a
    contemporaneous objection it  seems fair to  give the arguer  the
    benefit  of every  plausible interpretation  of her  words.   See
    United States  v. Donlon, 
    909 F.2d 650
    , 656-57 (1st  Cir. 1990);
    Glantz,  810 F.2d  at 323; cf.  Robinson, 
    485 U.S. at 31
     (noting
    that counsel's failure to object contemporaneously suggests  that
    the arguer's statement is not ambiguous).
    In  this  case,  the  prosecutors'  remarks,  taken  in
    context and at face value, do not  appear to constitute a comment
    on  the accuseds'  silence.   The  government's closing  argument
    recounted  the  evidence   against  each  defendant  and,   while
    admitting that  certain prosecution witnesses  possessed unsavory
    reputations  and might  profit  by cooperation,  the  prosecutors
    urged the jury to find that those witnesses testified truthfully.
    Not  surprisingly,  defense  counsels' summations  played  up the
    20In  this case,  the  district  court  apparently  did  not
    believe  that  the  prosecutors  intended  the  statements  as  a
    reflection on the  defendants' failure to testify  and appellants
    have not imputed so malign a motive  to the prosecution team.  We
    focus,  therefore,  on  what  the   jury  might  have  taken  the
    statements to imply.
    44
    credibility theme, systematically  besmirching the reliability of
    the government's  witnesses, stressing  internal inconsistencies,
    and  outlining  perceived  conflicts  between  the  testimony  of
    different witnesses.  Throughout, counsel paraded the cooperating
    witnesses' criminal records  past the jury and made  much of what
    those  witnesses  stood  to  gain  by  currying  favor  with  the
    authorities.
    Visualized   against  this   backdrop,  and   assigning
    ordinary  words their  most  natural  meaning, the  prosecution's
    argument  that   the  defense   had  not   successfully  rebutted
    incriminating  evidence seems not to be  a comment on appellants'
    failure to  testify but  a comment about  the credibility  of the
    government's case.  Arguments of this stripe do not trespass upon
    the accused's  right to remain silent.   See Lockett v. Ohio, 
    438 U.S. 586
    ,  595   (1978)  (finding  remarks  that   evidence  was
    "unrefuted"  and  "uncontradicted"  not   to  violate  the  Fifth
    Amendment); see also United States  v. Pitre, 
    960 F.2d 1112
    , 1124
    (2d Cir. 1992)  (upholding a prosecutor's comment  that defendant
    had offered no competing explanation); United States v. Castillo,
    
    866 F.2d 1071
    , 1083 (9th  Cir. 1988)  (upholding a  prosecutor's
    remark about  defendant's  failure  to  rebut  evidence);  United
    States  v.  Borchardt,  
    809 F.2d 1115
    ,  1119  (5th  Cir.  1987)
    (similar).   Within  the bounds  of  fair play  and due  process,
    prosecutors are not barred from making powerful arguments.
    To be sure, it is  conceivable that a juror hearing the
    prosecutors' words might have interpreted them as a commentary on
    45
    appellants' joint decision not to  testify.  But we cannot decide
    this case  based on what amounts  to a doomsday scenario.   After
    all,  an  appellate court  is  not at  liberty  to "infer  that a
    prosecutor intends an ambiguous remark to have  its most damaging
    meaning or that a jury, sitting through lengthy exhortation, will
    draw   that  meaning   from  the   plethora   of  less   damaging
    interpretations."  Lilly, 
    983 F.2d at 307
     (citation omitted); see
    also  Robinson, 
    485 U.S. at 31
     (explaining  "that an  appellate
    court may [not] substitute its reading of ambiguous language  for
    that of the trial court").  We are particularly unwilling to fish
    in  the   pool  of  ambiguity   where  the  defendants   did  not
    contemporaneously object or otherwise bring the  district court's
    attention to  any potentially harmful  circumlocution during  the
    summations.   Hence,  we  rule  that  the  prosecutors'  lack-of-
    refutation references did not require a mistrial.
    B.  Inflammatory Statements.
    The  second  half  of   appellants'  challenge  to  the
    government's   final   argument    implicates   what   appellants
    characterize  as four  attempts to  inflame the  jury, viz.,  the
    prosecutors' suggestion that  the jury could consider  the effect
    on the  community should  the Sepulveda  organization be able  to
    continue  in   business;21  two   references  to   the  "war   on
    21The first prosecutor argued, inter alia:
    We  put this  organization  out of  business.
    And  it's up to  you to decide  that it stays
    that  way.    Because   ask  yourselves,  the
    business practices of this organization, this
    organized   group  of   drug  dealers,   what
    46
    drugs";22  and  a  monition  that  feelings  of  pity  should  be
    subordinated to  the call of  civic duty.23   Because  defendants
    failed  to object  to these  remarks  when they  were voiced,  we
    review them only  for plain error.   See Smith, 
    982 F.2d at 682
    .
    Under that  regime, we  are constrained to  stay our  hand unless
    improper remarks "so poisoned  the well that the  trial's outcome
    practices will be allowed to  continue in the
    streets  of  Manchester and  the  surrounding
    towns  of New Hampshire  if these  people are
    allowed or permitted to  revive the drug ring
    . . . .
    22In rebuttal argument, the second prosecutor stated:
    It's  a sad but true fact of law enforcement,
    particularly  of this war  on drugs,  that if
    you're  going to try to clean out the sewers,
    you've  got to roll  up your sleeves  and get
    down  in  with  the filth,  and,  ladies  and
    gentlemen,  I, for one, am proud to have gone
    down  into those sewers and I'm proud to have
    been part  of this  prosecution team and  I'm
    proud  to be  a  small part  of  this war  on
    drugs.
    23In rebuttal, the second prosecutor also suggested:
    [I]f perhaps you  do feel  sorry for  anyone,
    then  what I'm asking  you to do,  ladies and
    gentlemen, is  to override any  such feelings
    with  your sense of duty as jurors, with your
    sense of responsibility as citizens, and with
    your  desire to do the job you've sworn to do
    in this  court of  law.   And consider  this.
    During this testimony Kurt Coriaty said  that
    if he  had not  been indicted and  prosecuted
    for his drug dealings, that he would still be
    on  the street today  selling drugs.   So ask
    yourselves, ladies and gentlemen, if you fail
    to  do your  duty  as  jurors  and  find  any
    defendant not  guilty just  because you  feel
    sorry for him, are you doing your community a
    service?   Are  you  doing  your  families  a
    service?    And  are  you  really doing  that
    defendant a service?
    47
    was likely  affected."  United  States v. Mejia-Lozano,  
    829 F.2d 268
    , 274 (1st Cir. 1987); accord United States v. Mateos-Sanchez,
    
    864 F.2d 232
    , 240-41  (1st  Cir. 1988).    None  of the  quoted
    statements comprise plain error in the setting of this trial.
    1.   Protection of the Community.  The first statement,
    1.   Protection of the Community.
    see supra note 21, went too far:  prosecutors overreach when they
    ask jurors to function as de facto vigilantes.  Yet, importantly,
    cf. United States v. Lester, 
    749 F.2d 1288
    , 1301 (9th Cir. 1984),
    there  is  no  sign  that  the  buzznacking  about  the Sepulveda
    organization resuming operations, while gratuitous, was part of a
    pattern of  remarks specifically  intended to  inflame the  jury.
    The  reference was  not prominently  featured  in the  summation;
    rather,  it was prefatory,  serving to introduce  a recitation of
    evidence that had  been presented at the trial.  When, as in this
    case, the evidence of defendants' guilt  is strong, courts should
    be very reluctant to find plain error in misguided rhetoric.  See
    United States v. Santana-Camacho, 
    833 F.2d 371
    , 373-74 (1st Cir.
    1987); Mejia-Lozano, 
    829 F.2d at 274
    ;  United States v.  Capone,
    
    683 F.2d 582
    , 586-87 (1st Cir.  1982).  So here:  we think  it is
    wildly improbable, given the weight of the evidence, that what we
    read   as  an  isolated,   relatively  subdued  appeal   for  law
    enforcement  affected  the  trial's outcome.    Consequently, the
    resumption-of-business  remarks  do  not   furnish  a  basis  for
    reversal.   See United  States v. Smith,  
    918 F.2d 1551
    , 1562-63
    (11th Cir.  1990); Hernandez, 
    891 F.2d at 527
    ; United  States v.
    Monaghan,  
    741 F.2d 1434
    ,  1441  n.30  (D.C. Cir.  1984),  cert.
    48
    denied, 
    470 U.S. 1085
     (1985).
    2.   The War  on Drugs.   A  somewhat different  set of
    2.   The War  on Drugs.
    considerations informs  our analysis  of the  next two  passages.
    Defense attorneys introduced the phrase  "war on drugs" and  used
    it  repeatedly during their opening statements and, later, during
    their  summations.   Mindful  of the  environment created  by the
    defense,  we  cannot  say  that  the  government's  two  rebuttal
    references to an ongoing war on drugs, though better left unsaid,
    comprised plain error.  The ancient adage applies:  what is sauce
    for the  government's goose often may  prove to be sauce  for the
    defendants' gander.
    Although we  deplore frank  appeals to  passion of  the
    sort  typified by "war  on drugs"  rhetoric, see,  e.g., Arrieta-
    Agressot, 
    3 F.3d at 527
    , we regard it as settled  that references
    to law enforcement efforts are not forbidden in summation if such
    references are  incited  or invited  by,  or fairly  respond  to,
    defendants' closing  statements.  See,  e.g., Smith, 
    918 F.2d at 1563
    ; United States v.  Brown, 
    887 F.2d 537
    , 542 (5th Cir. 1989);
    Machor,  
    879 F.2d at 956
    ;   United States  v. Bascaro,  
    742 F.2d 1335
    ,  1353-54 (11th  Cir.  1984), cert.  denied,  
    472 U.S. 1017
    (1985).  Though  there may well be exceptions to  this rule,24 no
    such exceptions  lie for cases  like this one    cases  where the
    dysphemisms are  few in number, do not escalate the level of fire
    24We  have, for instance, warned prosecutors that "there are
    limits  to the  extent that  we  will permit  fighting fire  with
    fire."   Mejia-Lozano, 
    829 F.2d at 274
    .  Merely because a defense
    attorney opens the  door does not mean that a prosecutor can come
    storming through it in a pair of hobnailed boots.
    49
    and  brimstone that characterized  the defense's oratory,  and do
    not provoke  a contemporaneous objection.   See United  States v.
    Tajeddini, 
    996 F.2d 1278
    , 1285 (1st Cir. 1993); Mejia-Lozano, 
    829 F.2d at 274
    .
    3.    Discouraging  Sympathy.    For  somewhat  similar
    3.    Discouraging  Sympathy.
    reasons, we  find the  final challenged  statement, quoted  supra
    note  23,  to fall  within the  pale.   Viewed  in  context, this
    statement,  which questioned whether an acquittal out of sympathy
    would  be in  the  community  interest, was  made  to dampen  the
    defense's  flirtation with  jury  nullification (described  infra
    Part VIII).   Courts should  allow prosecutors greater  leeway in
    rebuttal  when the defense has  itself breached the standards for
    proper summation.   See  Young, 
    470 U.S. at 11
    ; Lawn  v. United
    States, 
    355 U.S. 339
    , 359  n.15 (1958); Mejia-Lozano, 
    829 F.2d at 274
    ;  United States  v. Flaherty,  
    668 F.2d 566
    ,  598 (1st  Cir.
    1981).  Applying this offshoot of the goose-and-gander principle,
    we  hold that  the challenged  comment did  not constitute  plain
    error.
    VIII.  JURY NULLIFICATION
    The   defendants   invoked   the   specter   of    jury
    nullification  during  final  arguments.    Labrie's  lawyer,  in
    particular, invited the jury to "send out  a question" concerning
    this doctrine.  Three non-events followed; the government did not
    object to this  soliloquy, the district  court did not  intervene
    sua sponte,  and the court's  charge did not broach  the subject.
    Nevertheless, the deliberating jury took the invitation literally
    50
    and asked the judge to "[c]larify the law on jury nullification."
    The court responded by telling the jury:
    Federal   trial  judges   are  forbidden   to
    instruct on jury  nullification, because they
    are  required  to instruct  only  on  the law
    which applies to a case.  As I have indicated
    to  you, the burden in each instance which is
    here placed  upon the Government is  to prove
    each element of the  offenses . . .  beyond a
    reasonable  doubt,  and  in  the  event   the
    Government  fails to  sustain  its burden  of
    proof  beyond  a reasonable  doubt as  to any
    essential  element  of  any  offense  charged
    against each defendant, it has then failed in
    its  burden of proof as to such defendant and
    that defendant is to be acquitted.  In short,
    if the Government proves its case against any
    defendant, you should convict that defendant.
    If it  fails to  prove its  case against  any
    defendant you must acquit that defendant.
    Appellants objected to  this supplemental instruction.   They now
    argue that the instruction amounted to a wrongful repudiation  of
    the time-honored concept of jury nullification.
    The  applicable rule is  that, although  jurors possess
    the  raw power to set  an accused free  for any reason  or for no
    reason, their duty is  to apply the law as  given to them by  the
    court.  See   United States v.  Boardman, 
    419 F.2d 110
    ,  116 (1st
    Cir.  1969),  cert. denied,  
    397 U.S. 991
     (1970).   Accordingly,
    while jurors may choose to  flex their muscles, ignoring both law
    and evidence in  a gadarene rush to acquit  a criminal defendant,
    neither the court nor counsel should encourage jurors to exercise
    this power.   See United  States v. Trujillo,  
    714 F.2d 102
    ,  106
    (11th Cir.  1983).  A  trial judge, therefore, may  block defense
    attorneys' attempts  to serenade  a jury with  the siren  song of
    nullification,  see United States  v. Garcia-Rosa, 
    876 F.2d 209
    ,
    51
    226 (1st  Cir. 1989); and, indeed,  may instruct the  jury on the
    dimensions of their duty to the exclusion of  jury nullification,
    see Trujillo, 
    714 F.2d at 105-06
     (collecting cases).
    To the extent that appellants, during closing argument,
    managed to  mention nullification,  they received  more than  was
    their  due.    Having  pocketed  this  gratuity,  appellants  now
    complain that they were  not allowed to capitalize  on it.   When
    the jurors rose to the  bait, appellants say, Judge Devine should
    have   assured  them   that  nullification   is  an   "historical
    prerogative"  of juries  from  time  immemorial.    We  disagree.
    Though jury nullification has a long and sometimes  storied past,
    see Boardman, 419  F.2d at 116, the  case law makes plain  that a
    judge may not  instruct the jury anent its  history, vitality, or
    use.  See,  e.g., United States  v. Desmarais, 
    938 F.2d 347
    , 350
    (1st  Cir.  1991)  (collecting  cases).    This  proscription  is
    invariant; it makes no difference that the jury inquired, or that
    an  aggressive  lawyer  managed  to  pique  a  particular  jury's
    curiosity by mentioning the subject in closing argument, or  that
    a napping prosecutor  failed to raise a timely  objection to that
    allusion.    Thus,  the  district  court  appropriately  scotched
    appellants' suggested jury instruction.
    Appellants'  fallback  position     that  the  district
    court, if  disinclined to sing the praises of jury nullification,
    should have  refrained from  giving any  supplemental instruction
    and,  instead, should have  stonewalled   is  not well conceived.
    The objection  focuses on  the district  court's opening  comment
    52
    that "[f]ederal  trial judges are  forbidden to instruct  on jury
    nullification,"  interpreting  this  as  a  judicial  prohibition
    against  the jury's  use of  its inherent  power.   The objection
    fails for  several reasons,  most noticeably  because the  quoted
    statement conveys no such chilling effect.
    Taken  literally, the  judge's  comment is  an accurate
    recitation of the law and  an appropriate rejoinder to the jury's
    question on  nullification (a question that appellants prompted).
    The district court  explained why it could not  answer the jury's
    request for more information on nullification.  The court went on
    to  repeat its earlier instruction that  if the government proved
    its  case  the jury  "should"  convict, while  if  the government
    failed to carry its burden the jury "must" acquit.  This contrast
    in directives, together with  the court's refusal to instruct  in
    any  detail  about  the  doctrine  of  jury  nullification,  left
    pregnant the possibility that the jury could ignore the law if it
    so chose.  Whether the jury perceived this possibility or not, no
    error infiltrated the court's supplemental instruction.
    IX.  VARIANCE BETWEEN INDICTMENT AND PROOF
    Appellants Edgar Sepulveda and Tony Rood now claim that
    the  district court should have  acquitted them because they were
    not part  of the charged  conspiracy.  We review  their claims to
    determine whether  there is  sufficient evidence  to support  the
    jury's verdict.  See David, 
    940 F.2d at 732
    .  We conclude that  a
    rational  jury  could find,  as  this  jury  did, that  a  single
    conspiracy  existed, and that  the two objectors  participated in
    53
    it.
    We start with bedrock.  Ordinarily, questions anent the
    number  and structure  of conspiracies  present  matters of  fact
    suitable for  resolution by  a jury.   See id.; United  States v.
    Boylan, 
    898 F.2d 230
    , 243 (1st Cir.),  cert. denied, 
    489 U.S. 849
    (1990).   Of  course, the  jury's  inquiry is  guided by  certain
    principles.   For  example, in  a  unitary conspiracy  it is  not
    necessary that the membership remain static, see United States v.
    Perholtz, 
    842 F.2d 343
    , 364 (D.C. Cir.), cert.  denied, 
    488 U.S. 821
     (1988), or that all members join at the same time, see United
    States v.  Cintolo, 
    818 F.2d 980
    , 997  (1st Cir.)  (deeming that
    latecomers to a  conspiracy adopt the prior acts and declarations
    of earlier arrivals), cert. denied,  
    484 U.S. 913
     (1987), or that
    a given member knows  all his fellow coconspirators, see  Rivera-
    Santiago, 872 F.2d at 1079.   Similarly, the modus operandi of  a
    conspiracy may vary over time without negating the existence of a
    single conspiracy.  See Garcia-Rosa, 
    876 F.2d at 223
    .
    Turning to the instant case,  several defendants argued
    that  they were  not  members  of the  charged  conspiracy.   The
    district  court instructed  the  jury that  it  should convict  a
    particular defendant only  if it found him  or her to be  part of
    the  single  conspiracy  limned  in the  indictment.    The court
    cautioned the  jurors that  they must  acquit  any defendant  not
    linked  to  that  conspiracy even  if  they  concluded that  such
    defendant  had  been a  member  of  a  separate, equally  heinous
    conspiracy.  The  verdict, then, had the effect  of rejecting the
    54
    "multiple  conspiracy"  defense,  instead signifying  the  jury's
    contrary conclusion that the appellants collogued together within
    the framework of the master conspiracy.
    To  be sure,  the  charged  conspiracy  had  a  protean
    quality    but  many criminal  conspiracies,  particularly  large
    conspiracies that  function for  extended periods  of time,  must
    adjust  to  cope with  changing  conditions.    In this  respect,
    conspiracies are like other business organizations:  a conspiracy
    may  hire,  fire,  retool, change  suppliers,  expand,  downsize,
    refine   its  operating   practices,   undertake  new   marketing
    strategies, or  shift its priorities  from time  to time  without
    sacrificing its essential  identity.  It is, therefore, not fatal
    to  the  government's  "single  conspiracy"  theory  that   David
    Sepulveda began his career  by patronizing a cocaine supplier  in
    Nashua, and  later switched to  a source in Lawrence.   Likewise,
    the fact that the organization's methods and tactics evolved over
    time did not dictate  a finding of  two, three, or four  separate
    conspiracies.    The government  offered  evidence  showing that,
    throughout the  six-year period  covered by  the indictment,  the
    goals  of the organization were constant,  its leadership did not
    change, and  much of its  membership remained stable.   These are
    important indicia  of unitariness.   See David, 
    940 F.2d at 734
    .
    All in all,  we find the common threads adequate to create a jury
    question as to whether a single conspiracy existed.
    The  evidence  tying  Edgar  Sepulveda  to  the  single
    conspiracy  is more  than ample.   Two  witnesses testified  that
    55
    Edgar, himself, sold them cocaine.  Four witnesses testified that
    Edgar routinely  accompanied his  brother, David,  on drug-buying
    sprees.   One of  these witnesses,  Norberto Perez, testified  to
    taking  an average  of one  such trip  a week with  the Sepulveda
    siblings over a protracted period of time.  Another witness, John
    Rice, testified that he  saw the Sepulvedas packaging  cocaine at
    Driesse's home.
    There is  similar, albeit  less pervasive, evidence  of
    Rood's role  in the  organization.  Perez  testified that  he and
    Rood made  over fifteen trips  to Lawrence in order  to replenish
    David  Sepulveda's drug  inventory.   When  David  agreed to  pay
    Santos in  kind for chauffeuring  him during a drug  delivery, he
    instructed  Rood,  in  Santos's  presence,  to  give  Santos  his
    stipend.   On  another occasion,  David  sent Rood  and Perez  to
    retrieve cocaine that had  been abandoned during a  police chase.
    Finally,  a gaggle of witnesses, including Santos, testified that
    they had purchased cocaine from Rood.  From this variegated proof
    the jury could permissibly weave a tapestry linking Rood with the
    master conspiracy rather  than isolating him within  the cloister
    of the self-styled "mini-conspiracy" in which he now professes to
    have been involved.  See Moran, 
    984 F.2d at 1304
    ; Glenn, 
    828 F.2d at 861-62
    .
    To recapitulate,  the record satisfactorily  supports a
    multifaceted  finding that the  single conspiracy charged  in the
    indictment  existed and that  both Edgar Sepulveda  and Tony Rood
    enlisted  in it.   Thus,  no  material variance  existed and  the
    56
    district court properly refused to order acquittal.
    X.  POTPOURRI
    Appellants raise a  number of other issues.   Believing
    that  exegetic treatment of  these points  would serve  no useful
    purpose, we  reject some  by means of  this global  reference and
    discuss the rest in summary fashion.
    A.  Particularity of the Indictment.
    Two  appellants  challenge  the  particularity  of  the
    indictment as it applies to them.  While we comment separately on
    each  challenge, we  first lay  out  the black-letter  rule:   in
    general,  an  indictment   is  sufficiently   particular  if   it
    elucidates  the elements of the  crime, enlightens a defendant as
    to the  nature of the charge  against which she must  defend, and
    enables  her   to  plead  double   jeopardy  in  bar   of  future
    prosecutions for the same offense.  See Hamling v. United States,
    
    418 U.S. 87
    ,  117 (1974)  (collecting cases);  see also  Fed. R.
    Crim. P. 7(c)(1).
    1.  Arline Welch.  Defendant Arline Welch argues  that,
    1.  Arline Welch.
    as it  applies to  her, the  indictment transgresses  the Hamling
    guidelines.  The gravamen of her complaint is that the indictment
    neither contains the elements of  the crime charged nor limns the
    date, time,  and place of  her ostensible criminal activity.   We
    think  her reading  of the  charging papers  is colored  by self-
    interest.
    The grand jury indicted Welch for conspiracy to possess
    and distribute  cocaine in  violation of  21 U.S.C.     846.   To
    57
    convict  her, therefore,  the  government had  to  show beyond  a
    reasonable doubt that a drug-trafficking conspiracy existed about
    which Welch knew and in  which she voluntarily participated.  See
    David, 
    940 F.2d at 735
     (explaining elements of conspiracy under
    846);  Gomez-Pabon, 
    911 F.2d at 852
     (similar).   The indictment
    specifies the  law which  Welch is alleged  to have  violated and
    elaborates that she, with others, "knowingly" and "intentionally"
    agreed to act in contravention of that law.   The indictment also
    provides a temporal framework, asserts that Welch's residence was
    used as  a packaging center  for the drug distribution  ring, and
    states that she worked as a "runner" and a "street-level dealer."
    We think  this information  sufficiently spelled  out the  crime,
    apprised Welch of the charge against which she had to defend, and
    protected her from the boggart  of double jeopardy.  See Hamling,
    
    418 U.S. at 117
    ;  Paiva, 
    892 F.2d at 154
    .  In  the last analysis,
    indictments need not be infinitely specific.
    2.   Kevin Cullinane.   Defendant Kevin  Cullinane also
    2.   Kevin Cullinane.
    challenges the indictment's  particularity.  Notwithstanding  the
    pervasive proof of his complicitous conduct adduced at trial, see
    supra Part II(B), Cullinane points out that the indictment itself
    only mentions him twice, asserting that he purchased cocaine from
    David   Sepulveda  and  that,   on  one  specific   occasion,  he
    distributed  cocaine to another coconspirator.  But the frequency
    with which a person is (or is  not) mentioned in an indictment is
    an  insufficient  indicium  of  the  indictment's  particularity.
    Here,  the  charging  papers  contained  considerable  contextual
    58
    detail.   Given  the  indictment's  general  description  of  the
    conspiracy and  identification of the alleged  coconspirators, we
    find  that  it   put  Cullinane  on  fair  notice  and  contained
    information sufficient to allow him  to prepare his defense.  See
    Hamling, 
    418 U.S. at 117
    .  The drug conspiracy statute, 21 U.S.C.
    846,  does not  require the government  to plead  or prove  any
    particular overt  acts in  furtherance of  a charged  conspiracy.
    See United  States v. O'Campo,  
    973 F.2d 1015
    , 1019-20  (1st Cir.
    1992); Paiva, 
    892 F.2d at 155
    .
    B.  Bill of Particulars.
    The  same  two  appellants assign  error  to  the lower
    court's  denial  of  their  motions  for  bills  of  particulars.
    Motions  for bills of  particulars are seldom  employed in modern
    federal practice. When pursued, they  need be granted only if the
    accused, in the absence of a more detailed specification, will be
    disabled from preparing  a defense, caught by unfair  surprise at
    trial, or hampered in seeking  the shelter of the Double Jeopardy
    Clause.  See  United States  v. Abreu, 
    952 F.2d 1458
    , 1469  (1st
    Cir.) (collecting cases),  cert. denied, 
    112 S. Ct. 1695
     (1992).
    We  review refusals  to  require such  bills  under an  abuse-of-
    discretion test.   See United States v. Hallock, 
    941 F.2d 36
    , 40
    (1st Cir. 1991).
    Here, both appellants enjoyed  the benefits of modified
    open-file discovery, i.e.,  automatic discovery that  encompassed
    all relevant data except Jencks Act material related to witnesses
    not  employed in law enforcement.  Neither appellant convincingly
    59
    relates  a concrete instance  of inability to  prepare, untenable
    surprise, or other  cognizable prejudice stemming from  the trial
    court's refusal to mandate further particulars.  For our part, we
    have  been  unable  to  discover  any  such  instance.    In  the
    unremarkable circumstances of this case, the district court acted
    well  within  the   encincture  of  its  discretion   in  denying
    appellants' motions.
    C.  Speedy Trial.
    Arline Welch  contends that  the court  below erred  in
    refusing to  dismiss the charges  against her on the  ground that
    too long  a time  intervened between indictment  and trial.   Her
    claim invokes  the  Speedy  Trial Act,  18  U.S.C.      3161-3174
    (1988).  The Act provides in pertinent part:
    In  any  case  in which  a  plea  of not
    guilty is entered,  the trial of a  defendant
    charged in  an . .  . indictment . .  . shall
    commence within seventy days from the  filing
    date . . .  of the . . . indictment,  or from
    the date the defendant has appeared before  a
    judicial officer  . . ., whichever  date last
    occurs.
    18 U.S.C.   3161(c)(1).
    For   Speedy  Trial   Act  purposes,   time  has   both
    quantitative  and qualitative dimensions.  The Act's 70-day trial
    mandate,  see 
    id.,
      exemplifies its  quantitative side.   On  the
    qualitative  side,  the  Act  excludes  from  the  70-day  period
    intervals of delay  that result from such events  as the pendency
    of pretrial motions, see 18 U.S.C.   3161(h)(1)(F),  the presence
    of other defendants  in the case "as  to whom the time  for trial
    has not run and no motion for severance has been granted," 
    id.
     at
    60
    3161(h)(7), or continuances which  serve the "ends of justice,"
    id. at   3161(h)(8)(A).  Therefore, a violation of the Act occurs
    only if (i) a sufficient  number of days elapse (the quantitative
    benchmark),  and (ii) the days are nonexcludable (the qualitative
    benchmark).
    Against this background, the chronology of Welch's case
    is telling.  Her arraignment took place on November 19, 1990, and
    her trial started on April 2, 1991.  Quantitatively, this 134-day
    interval  exceeds the  goal set  by the Speedy  Trial Act.   But,
    qualitatively,  the  record  presents   a  much  more  excusatory
    picture.   The bulk of  the time elapsed between  arraignment and
    trial  is  excludable  for  Speedy  Trial  Act  purposes  because
    pretrial motions filed by the defendants, as  a group, engendered
    considerable delay (bringing the nonexcludable time to fewer than
    35 days).   Hence, the court  below did not  err in declining  to
    dismiss  the case  under  the  Speedy Trial  Act.25   See,  e.g.,
    United  States  v. Ramirez,  
    973 F.2d 36
    ,  37 (1st  Cir.  1992)
    (collecting cases); United States v. Torres Lopez, 
    851 F.2d 520
    ,
    526 (1st Cir.  1988), cert. denied, 
    489 U.S. 1021
     (1989); United
    States v. Anello, 
    765 F.2d 253
    , 256-58 (1st Cir.), cert. denied,
    
    474 U.S. 996
     (1985).
    D.  David Chase's Testimony.
    At  trial,  David  Chase testified  that  he  regularly
    25We  note that the district court  also granted an ends-of-
    justice  continuance on December  18, 1990, in  response to David
    Sepulveda's  motion for  an  extension  of  discovery  deadlines,
    thereby providing an  additional source of excludable  time.  See
    18 U.S.C.   3161(h)(8)(A).
    61
    purchased cocaine  from appellant  Cullinane until, having  grown
    dissatisfied  with the  quality of  Cullinane's  wares, he  began
    buying  directly from David  Sepulveda.  Cullinane  argues before
    us, as he  argued below, that Chase's testimony  should have been
    purged   because  Chase  did  not  explicitly  tie  Cullinane  to
    Sepulveda.  We disagree.
    The  relevancy  of a  witness's  testimony cannot  be
    gauged in isolation.  See United States v. Hickey, 
    596 F.2d 1082
    ,
    1089  (1st Cir.),  cert. denied,  
    444 U.S. 853
     (1979).   Several
    witnesses other  than Chase  described Cullinane's  dealings with
    Sepulveda,  including his purchases of contraband and their joint
    participation  in drug-buying excursions.   Given this contextual
    detail, the  jury could well infer  that the sales to  Chase were
    connected to the Cullinane-Sepulveda  axis.  In a criminal  case,
    proof  need  not  be  explicit;  juries  are  permitted,  indeed,
    encouraged, to draw  reasonable inferences from the  facts before
    them.  See, e.g.,  Echeverri, 
    982 F.2d at 679
    ; United States  v.
    Ingraham, 
    832 F.2d 229
    , 239-40 (1st Cir. 1987), cert. denied, 
    486 U.S. 1009
      (1988).    The  district  court  did  not  abuse  its
    discretion in admitting evidence of Cullinane's sales to Chase as
    circumstantial evidence of  Cullinane's role in  the distribution
    network.
    E.  Steven Ranfros's Testimony.
    David  Sepulveda objected  to the  testimony of  Steven
    Ranfros,  a police  officer  who  recounted  that  Sepulveda  and
    several of his associates chased Ranfros when they discovered him
    62
    watching  them  from  a  wooded area.    Sepulveda  insists  that
    Ranfros's testimony lacks any relevance.
    Relevance is defined  in terms of probative  value, see
    Fed. R. Evid. 401, and  trial courts are afforded wide discretion
    in  assessing  the  relevance and  probative  value  of proffered
    evidence.  See United States v. Sutton, 
    970 F.2d 1001
    , 1006  (1st
    Cir.  1992); United  States v.  Nickens, 
    955 F.2d 112
    ,  125 (1st
    Cir.), cert. denied, 
    113 S. Ct. 108
     (1992).  We will disturb  an
    exercise  of  that discretion  only  upon a  showing  of manifest
    abuse.  See United States v. Yefsky, 
    994 F.2d 885
    , 898  (1st Cir.
    1993).   We discern  no such problem  here.   Ranfros's testimony
    could  be taken  to  bear  on guilty  knowledge,  and, thus,  the
    district court had discretion to allow the jury to consider it.
    F.  The Terry Stop.
    At trial, the government  introduced evidence that  the
    police  seized $4,200 from  David Sepulveda after  a highway stop
    near  Nashua.   Sepulveda moved  to suppress  the evidence.   The
    government contended that  the cash constituted  the fruits of  a
    search incident  to a lawful  arrest.  The district  court denied
    the  suppression motion without comment.  Sepulveda assigns error
    to this  ruling and to  the admission of evidence  emanating from
    the seizure.
    In  its appellate  brief, the  government concedes  the
    fallibility of the construct that it hawked in the district court
    and, instead, attempts to justify the search under Terry v. Ohio,
    
    392 U.S. 1
    ,  29-30  (1968).   At  oral  argument the  government
    63
    executed yet  another about-face,  acknowledging that the  Terry-
    based yarn  spun in its  brief is easily  unravelled.  We  do not
    find  it surprising  that  the  prosecution,  like  a  Pirandello
    character in  search of  an author,  has encountered  insuperable
    difficulties in articulating a viable theory:  the short of it is
    that the cash  was unlawfully  seized and  that evidence  derived
    from  the  seizure  should  have  been suppressed.    We  do  not
    understand why  the government is  unwilling simply to  face that
    fact    or why it pressed so vigorously to have evidence obtained
    in a patently illegal manner admitted in the first place.
    At  any rate,  the matter  is academic.   As  a general
    rule,  a defendant  is not  shielded if  the  government violates
    someone  else's  constitutional  rights.   See  United  States v.
    Santana, 
    6 F.3d 1
    , 8  (1st Cir. 1993).  Consequently, Sepulveda's
    coconspirators have no standing to raise  a claimed abridgment of
    his Fourth Amendment  rights.  See United States  v. Padilla, 
    113 S. Ct. 1936
    , 1939 (1993); Rawlings v. Kentucky, 
    448 U.S. 98
    ,  106
    (1980).
    As  to  Sepulveda  himself,  the  erroneously  admitted
    evidence is cumulative.   In testimony not covered  by the motion
    to suppress, a civilian witness, Michael Lacerte, related that he
    had given  the funds in  question to Sepulveda so  that Sepulveda
    could   buy  cocaine.     Lacerte   also  recounted   Sepulveda's
    explanation as to seizure of the money.  Under the circumstances,
    and bearing in mind the factors that frame our inquiry, see supra
    pp. 30,  whatever error inhered  in admitting evidence  anent the
    64
    seizure and its sequelae was entirely harmless.
    G.  Jury Taint.
    At one point during the  trial, a juror joked about one
    of the defendants.  The  district court proceeded to question two
    jurors  out of  earshot of  the  venire.   After identifying  the
    individual  responsible for  the  wisecrack, the  court dismissed
    her.   Appellants  moved unsuccessfully  for  a mistrial  and now
    posit error based on the denial of their motion.
    We  find  nothing  amiss.   When  a  potentially taint-
    producing  event threatens  to  mar  the  jury's  integrity,  the
    district  court has fairly  broad discretion in  deciding whether
    the  situation is  susceptible to  remediation, and  if  so, what
    corrective action might be appropriate.   See Boylan, 898 F.2d at
    258; Gutierrez-Rodriguez  v. Cartagena,  
    882 F.2d 553
    , 570  (1st
    Cir. 1989).   Unless the event leaves  so sour a taste  that less
    extreme palliatives will prove inadequate to undo serious damage,
    the  mere  possibility  of  jury taint  does  not  necessitate  a
    mistrial.  See  United States v. Hunnewell, 
    891 F.2d 955
    , 960-61
    (1st Cir. 1989).  Mindful of the trial  court's superior coign of
    vantage, we  accord great respect  to a district  judge's finding
    that a  jury has not been  irreparably tainted.  See  Boylan, 898
    F.2d at 258.
    Here,   the    judge   employed   a    combination   of
    amelioratives:  he removed the  offending juror from the case and
    issued hortatory  instructions to  the remaining  jurors.   Given
    what  transpired, the judge's  prescription seems reasonably well
    65
    calculated  to  protect  the defendants'  legitimate  rights; the
    joke,  albeit tasteless,  did not  work a  per se  deprivation of
    appellants' right to a fair trial.  Consequently, the court acted
    appropriately in refusing to abort the trial.  See Hunnewell, 
    891 F.2d at 961
    .
    H.  Destruction of Evidence.
    On   May  5,  1989,   in  the  course   of  a  separate
    investigation, the government took  custody of certain  telephone
    records  belonging to defendant  Cullinane.  After  examining the
    records, the  government returned them to  Cullinane's housemate.
    In  turn,  the  housemate  threw  them  out.    Seizing  on  this
    development,  appellant  Arline  Welch   asseverates  that  those
    records  may have  contained  exculpatory material  vis-a-vis her
    relationship with Cullinane and that, therefore, the government's
    failure  to maintain them  requires dismissal of  the indictment.
    The asseveration is full of holes.
    Government  destruction   of  potentially   exculpatory
    evidence only violates the rule in Brady,  
    373 U.S. at 87
    , if the
    evidence  possesses apparent exculpatory  value that cannot fully
    be  replicated through other sources, and  if the government acts
    willfully or in bad faith in failing to preserve it.  See Arizona
    v. Youngblood, 
    488 U.S. 51
    ,  58 (1988); California v.  Trombetta,
    
    467 U.S. 479
    , 488-89  (1984); United States  v. Femia,      F.3d
    ,       (1st  Cir.  1993)  [No. 93-1276,  slip  op.  at  8-9].
    Government investigators typically cast a  wide net and haul in a
    variety  of  items.    While evidence,  once  seized,  cannot  be
    66
    destroyed  willy-nilly, the government does not become an insurer
    of  the  perpetual  availability  of  every  item  caught in  its
    investigatory net.  See, e.g., United States v. Kincaid, 
    712 F.2d 1
    , 2-3 (1st Cir. 1983).
    In  the situation  at  hand,  the  government  did  not
    destroy  the  records Welch  seeks  but merely  returned  them to
    Cullinane's residence.   There  is no  hint of  bad faith and  no
    indication that the agents knew, or should have anticipated, that
    Cullinane's friend  would thereafter discard them.   Accordingly,
    Welch's motion is best regarded as a throwaway.26
    I.  Cumulative Error.
    Appellants argue  that  even if  certain trial  errors,
    taken in isolation,  appear harmless, the accumulation  of errors
    effectively undermines due process and demands a fresh start.  We
    accept   the   theoretical   underpinnings   of  this   argument.
    Individual errors,  insufficient in  themselves to  necessitate a
    new trial, may in the  aggregate have a more debilitating effect.
    See, e.g.,  United States  v. Dwyer,  
    843 F.2d 60
    , 65 (1st  Cir.
    1988); Dunn v. Perrin, 
    570 F.2d 21
    , 25  (1st Cir.), cert. denied,
    
    437 U.S. 910
     (1978); cf. United States v. Samango, 
    607 F.2d 877
    ,
    884  (9th  Cir.  1979) (employing  cumulative  error  doctrine to
    invalidate results of grand jury  proceeding).  In other words, a
    column  of  errors  may  sometimes  have  a  logarithmic  effect,
    producing a total  impact greater than the arithmetic  sum of its
    26In view of  this shortfall, we need not  address the other
    prongs of the test.
    67
    constituent parts.
    Of  necessity,   claims  under  the   cumulative  error
    doctrine are  sui generis.   A  reviewing tribunal must  consider
    each such claim  against the background of  the case as  a whole,
    paying particular weight to factors such as the nature and number
    of the  errors committed;  their interrelationship,  if any,  and
    combined effect; how the district  court dealt with the errors as
    they arose (including the efficacy   or lack of efficacy   of any
    remedial efforts);  and the  strength of  the government's  case.
    See,  e.g., Mejia-Lozano, 
    829 F.2d at
    274  n.4.  The  run of the
    trial  may   also  be  important;   a  handful  of   miscues,  in
    combination, may often pack a greater punch in a short trial than
    in a much longer trial.
    The  cumulative  error  doctrine  is  inapposite  here.
    While we have  uncovered a few benign bevues,  e.g., the district
    court's failure  to grant  David Sepulveda's  motion to  suppress
    evidence of money illegally seized from him, see supra Part X(F),
    and  the ill-advised admission  of two statements  unsupported by
    extrinsic  evidence and, hence,  ineligible for special swaddling
    under Fed. R. Evid. 801(d)(2)(E), see supra Part V(B), the errors
    were  not  portentous;  they  were  few  and  far  between;  they
    possessed  no  special  symbiotic effect;  they  occurred  in the
    course of a  two-month trial; and the government's  case was very
    strong.  Consequently, the errors,  in the aggregate, do not come
    close to achieving  the critical mass necessary to  cast a shadow
    upon the integrity of the verdict.
    68
    Considering the  trial's length, complexity,  and hard-
    fought nature,  the district court's  handling of  it evokes  our
    admiration.    Appellants'  focus on  cumulative  error  does not
    change  the  picture.    The  Constitution  entitles  a  criminal
    defendant to a  fair trial,  not to  a mistake-free  trial.   See
    Delaware v. Van Arsdall, 
    475 U.S. 673
    , 681 (1986); United States
    v. Polito,  
    856 F.2d 414
    , 418 (1st Cir. 1988).   When all is said
    and done, the proceedings here meet this measure.
    XI.  SENTENCING ISSUES
    The sentencing issues raised in these appeals implicate
    the  federal sentencing  guidelines.27   See  David, 
    940 F.2d at 739
      (holding  that the  guidelines  apply to  a  conspiracy that
    "begins before the guidelines' effective date and continues after
    the  effective date").  Six appellants (Rood, Wallace, Cullinane,
    Arline  Welch,  Edward  Welch,  and  Johnson)  challenge  rulings
    relative to  the imposition  of sentence.28   To the  extent that
    these challenges touch  upon the district court's  factfinding or
    its evaluative judgments in applying the guidelines to the  facts
    as found, appellate review is for clear error.  See United States
    27Since the  district court sentenced appellants  on various
    dates  in  January   1992,  the  November  1991  version  of  the
    sentencing guidelines applies in this case.  See United States v.
    Harotunian, 
    920 F.2d 1040
    , 1041-42 (1st Cir.  1990) ("Barring any
    ex post facto problem, a defendant is to be punished according to
    the   guidelines  in  effect   at  the  time   of  sentencing.").
    Therefore, all references to the sentencing guidelines will be to
    the  November   1991  edition,   unless  otherwise   specifically
    indicated.
    28The court  below sentenced  appellants to assorted  prison
    terms  ranging from  a  high of  almost  twenty-two years  (David
    Sepulveda) to a low of five years.
    69
    v. St.  Cyr, 
    977 F.2d 698
    ,  701 (1st Cir.  1992).  To  the extent
    that  the challenges  raise  "pure" questions  of law  or require
    interpretation of the guidelines, our review is plenary.  See 
    id.
    A.  General Principles.
    In   drug-trafficking   cases  under   the   sentencing
    guidelines, sentences  are largely quantity-driven.   See,  e.g.,
    United States v. Morillo,      F.3d    ,     (1st Cir. 1993) [No.
    93-1388,  slip op. at  12 & n.10];  United States  v. Garcia, 
    954 F.2d 12
    , 15 (1st Cir.  1992); United States  v. Blanco, 
    888 F.2d 907
    , 909-11 (1st  Cir. 1989); see also United  States v. Bradley,
    
    917 F.2d 601
    , 604 (1st Cir. 1990) (describing drug quantity as "a
    key  datum"  for   sentencing  purposes).    The   drug  quantity
    attributable  to  a  particular defendant  is  derived  by adding
    together the amounts of narcotics, actual or negotiated, bound up
    in the acts  "that were  part of  the same course  of conduct  or
    common scheme  or plan as  the offense of conviction."   U.S.S.G.
    1B1.3(a)(2).   However,  in the  context  of jointly  undertaken
    criminal  activity,  such as  a  conspiracy, a  defendant  is not
    automatically  saddled with the  full weight of  the conspiracy's
    wrongdoing;  rather,  a  defendant is  responsible  for  drugs he
    personally  handled  or  anticipated  handling,  and,  under  the
    relevant  conduct rubric, for  drugs involved in  additional acts
    that  were reasonably  foreseeable by  him and were  committed in
    furtherance  of the  conspiracy.   See  Garcia, 
    954 F.2d at 15
    ;
    David,  
    940 F.2d at 742
    ; see also U.S.S.G.  1B1.3(a)(1), comment.
    (n.1).  In this regard, we have emphasized that "the measure of a
    70
    defendant's  accountability for drug transactions in which he was
    not personally  involved is usually  congruent with the  scope of
    his  agreement  with  the  other  participants  in  the  criminal
    enterprise."  Garcia, 
    954 F.2d at 16
    .
    B.  Tony Rood; William Wallace.
    Appellants  Rood and  Wallace  object to  the  district
    court's  attribution  of  particular  drug  quantities  to  them.
    Because the same type of error infects both sentences, we discuss
    them in the ensemble.
    In regard  to Rood  and Wallace,  the district  court's
    drug quantity calculations  rested essentially  on Perez's  trial
    testimony.29    According  to  Perez,  Rood  accompanied  him  on
    fifteen  to twenty drug-buying jaunts and Wallace accompanied him
    on ten to  fifteen such trips.   Perez did not  assign particular
    amounts to particular  people on  particular trips.   Rather,  he
    testified  in sweeping  generalities, stating  that the  smallest
    amount he  remembered having been  acquired, in the eighty  or so
    trips he took with Sepulveda and an assortment of companions over
    a two-year period (1987-1989), was four ounces (113.4 grams), and
    the largest amount acquired was one kilogram (an amount purchased
    more  than once).   In  preparing  the presentence  investigation
    report  (PSI Report), the probation department adopted methods of
    calculation  apparently  urged  by the  prosecution.    The basic
    29To  be sure, there  was some evidence  of participation by
    Rood and-or Wallace in a few other incidents.  But the quantities
    involved in  these incidents were  niggling in comparison  to the
    Sepulveda trips and, thus, do not affect these appeals.
    71
    method  was to  construct a  double "average"  covering both  the
    number of runs  and the amount of cocaine carried.  This was done
    by  taking  the  midpoint  of   the  high  and  low  figures  and
    multiplying the  average  number of  runs by  the average  amount
    carried.  Thus, in Wallace's  case, the PSI Report assumed twelve
    runs (an alleged "average" of ten and fifteen) and 556 grams  per
    run  (the rounded-off average, expressed in grams, of four ounces
    and  one kilogram),  attributing  a total  of  6.68 kilograms  of
    cocaine to  him.  In  Rood's case, a different  probation officer
    proposed  a  slightly   more  complicated  (but  methodologically
    similar) calculation  and attributed 8.3  kilograms to him.   The
    exact  mechanics  are beside  the  point; what  matters,  for our
    purposes,  is  that,  albeit  somewhat  more  circuitously,   the
    ultimate attribution  of a  drug quantity figure  to Rood,  as to
    Wallace,  represented   an  assumed   average  number  of   trips
    multiplied by an assumed average quantity of cocaine per trip.
    The district  court held  separate sentencing  hearings
    for Rood and Wallace.  Neither the prosecution nor the defendants
    offered additional evidence.  The court, over objection, endorsed
    the probation  officers' calculations, attributing  8.3 kilograms
    of cocaine to Rood and 7.6 kilograms  to Wallace.  This yielded a
    base  offense level  (BOL)  of 32  for  each man.   See  U.S.S.G.
    2D1.1(c) (6) (Drug Quantity  Table) (establishing BOL of 32  for
    at least five  but less than fifteen kilograms of  cocaine).  The
    court  essayed  further  offense-level  adjustments (not  now  in
    dispute), factored Rood's criminal history category (IV) into the
    72
    mix,  and set  his guideline  sentencing range  (GSR) at  135-168
    months.   The court sentenced  Rood at  the bottom of  the range.
    Wallace  displayed a  less notorious  criminal history  (category
    II).  Nonetheless,  after interim adjustments not  material here,
    his GSR proved  to be  identical.   Relying on  United States  v.
    Floyd, 
    945 F.2d 1096
    , 1099 (9th Cir.  1991), and citing a lack of
    adult   guidance  during  Wallace's  youth,  the  court  departed
    downward, sentencing him to ten years.30
    The defense's first line of attack is to assail Perez's
    testimony as utterly unreliable in view of his dubious character,
    asserted  contradictions, and  sundry other  defects.   But,  the
    trial judge  heard and saw  Perez testify at trial,  and credited
    his testimony.   Such credibility  calls are grist for  the trial
    court's mill.   See St. Cyr, 
    977 F.2d at 706
    .   Consequently, we
    have no basis for overturning this judgment.
    Nonetheless, one swallow  does not a summer make.   The
    critical problem  with respect to  these sentences lies  not with
    Perez's testimony  but with  the pyramiding  of inferences  based
    upon it.  Perez's testimony was elicited at  trial, not at either
    sentencing hearing,  and  the  prosecution,  primarily  concerned
    during trial with proving the defendants' participation in a drug
    trafficking conspiracy rather than fixing the precise quantity of
    drugs  for  which  each  defendant  might  be  held  responsible,
    30Floyd has since  been overruled, albeit on  other grounds.
    See  United States  v. Atkinson,  
    990 F.2d 501
     (9th  Cir. 1993).
    However, the government has not prosecuted a cross-appeal and the
    validity of the departure decision is not before us.
    73
    obtained  a  bare  minimum  of   information.    With  no  better
    information  at  hand,  these  appellants'  sentences  cannot  be
    upheld.
    For sentencing purposes, the government must prove drug
    quantities by a preponderance of the evidence.  See United States
    v. Sklar, 
    920 F.2d 107
    , 112-13 (1st Cir. 1990); Bradley, 
    917 F.2d at 605
    .   Courts  must sedulously  enforce that  quantum-of-proof
    rule, for,  under the  guidelines, drug  quantity has  a dramatic
    leveraging   effect.     Thus,   relatively   small  quantitative
    differences may produce markedly different periods of immurement.
    This reality informs  the preponderance standard, requiring  that
    district  courts   must   base  their   findings   on   "reliable
    information" and, where uncertainty reigns, must "err on the side
    of caution."   Sklar, 
    920 F.2d at 113
     (quoting United  States v.
    Walton, 
    908 F.2d 1289
    , 1302  (6th Cir.), cert. denied,  
    498 U.S. 990
     (1990)).
    These  tenets possess  particular force  on the  record
    before  us, for  we do  not  believe that  the so-called  average
    figures selected  by the  probation officers  and adopted  by the
    trial court have adequate support in the record.  To say that the
    minimum amount carried on a single  trip was four ounces and that
    the maximum  was  one kilogram  provides  no rational  basis  for
    presuming that  the average amount  carried on a given  number of
    trips  was  the mathematical  midpoint between  the high  and low
    figures.   Cf. United States v. Hewitt,  
    942 F.2d 1270
    , 1274 (8th
    Cir.   1991)  (condemning  use  of  a  "far  reaching"  averaging
    74
    assumptions in estimating  drug quantity).  Similarly,  while the
    distortions are mathematically  less serious, the selection  of a
    midpoint in  estimating  the  number of  trips  is  also  without
    evidentiary support.   And the  two flawed findings feed  on each
    other; by using not one,  but two, unsupported averages to arrive
    at both the number of trips undertaken and the amounts of cocaine
    handled  in the  course of  each trip,  the court  compounded the
    error of its ways.   This is,  after all, not a  case in which  a
    witness testified that, in his or her estimation,"X" equalled the
    average  drug quantity  involved  in a  specific  number of  drug
    transactions.   That  kind of  estimate  from a  lay witness  may
    itself be  troublesome, but  at least the  witness can  be cross-
    examined  on the figure;  and this  court has  sometimes accepted
    such  estimates  in  the  past.   See,  e.g.,  United  States  v.
    Innamorati, 
    996 F.2d 456
    , 490  (1st Cir.), cert. denied,      S.
    Ct.     (1993).  It is also  not a case where a witness has given
    a  range, as  to amounts  or  as to  trips, but  other persuasive
    evidence (e.g., documents or records) exists tending to show that
    some figure within  the range is supported by  a preponderance of
    the evidence.  Here, to the contrary, the court did not cite, and
    the PSI Report did not  identify, any extrinsic evidence or other
    circumstances   making   averaging  peculiarly   appropriate   or
    suggesting a  basis, apart from averaging, on which the probation
    officers'  determinations  might rest.    For our  part,  we have
    combed  the record and  unearthed nothing that  remotely suggests
    Wallace joined in  transporting shipments averaging 556  grams or
    75
    that Rood's shipments averaged twelve  to sixteen ounces.  In the
    face of timely objection, wholly conclusory findings such  as are
    now before us  cannot be said  to command a preponderance  of the
    evidence,  and,  therefore, cannot  support an  imposed sentence.
    Cf., e.g., United States v. Shonubi, 
    998 F.2d 84
    , 89-90 (2d Cir.
    1993) (vacating,  in the  absence of  other evidentiary  support,
    district  court's  drug  quantity  finding  arrived  at  by  rote
    multiplication of number  of trips times quantity  carried on one
    such trip);  United States v.  Garcia, 
    994 F.2d 1499
    ,  1509 (10th
    Cir.  1993)  (vacating  defendant's  sentence  and  holding  that
    averages, when used to arrive  at drug quantity findings, must be
    "more than a guess").  And the  gap in proof is not satisfied  by
    showing, as  the government seeks to  do in its brief,  that more
    trips and larger amounts are consistent with the general scale of
    the Sepulveda enterprise.
    Let us be perfectly clear.  We do not announce a per se
    rule barring  a court from  sentencing at a point  different than
    the low end of a testified range.  There may be other evidence in
    the case,  direct or circumstantial,  making it more  likely than
    not  that the  low point is  simply too  low and that  some other
    point  is  more   probably  representative.    Indeed,   in  some
    situations,  the  estimate  itself,  and  the  contextual  detail
    surrounding  it, may  provide the  needed enlightenment.   In our
    view, a  sentencing court remains  free to make judicious  use of
    properly  constructed  averages  and,  ultimately,  to  make  any
    finding that  the record supports.   See United States  v. Miele,
    76
    
    989 F.2d 659
    , 664-65 (3d Cir. 1993) (explaining that, where there
    is  other  evidence  tending  to  buttress the  high  end  of  an
    estimated range, the sentencing court need not restrict itself to
    the range's low end); see  also U.S.S.G.   6A1.3(a) (stating that
    the  information on  which  a  sentence  is  based  must  possess
    "sufficient  indicia  of  reliability  to  support  its  probable
    accuracy").   Here,  however, the  record  does not  justify  the
    district  court's findings  concerning  the  drug  quantities  it
    attributed  to Rood  and  Wallace.    Accordingly,  because  drug
    quantity dictated these  appellants' offense levels and  at least
    arguably  influenced  their  sentences,  Rood   and  Wallace  are
    entitled to be resentenced.31
    C.  Kevin Cullinane.
    After all relevant adjustments had been made, the court
    below established a GSR of 121-151  months referable to appellant
    Cullinane,32  and  sentenced him  at  the  range's  nadir.   This
    determination  rested in  substantial part  on  the court's  drug
    31On remand, the district court  is, of course, free to hear
    new evidence bearing on drug quantity.  For example, it  may well
    be that better evidence  can be adduced by recalling  Perez or by
    calling other witnesses.   Alternatively, the government  has the
    "low point" estimates as to both  the number of trips and amounts
    transported to fall back upon   and it has some specific evidence
    as to other transactions.  To start a mini-trial on drug quantity
    is surely a  discouraging supplement to a lengthy  trial; but too
    much rides  on the  computations to  rely upon the  kind of  drug
    quantity calculations  that the  government urges  in respect  to
    these two appellants.
    32We  do not  dissect the  interim  adjustments made  by the
    district court en route to  the GSR as Cullinane concentrates his
    fire on the  drug quantity finding.  We follow this same pattern,
    whenever applicable, in discussing other appellants' sentences.
    77
    quantity  assessment.    Cullinane  challenges  this  assessment,
    insisting that Judge Devine erred in ascribing 8.99  kilograms of
    cocaine to him.
    Our   review   of   Cullinane's   challenge   is   more
    circumscribed  than  might  appear   at  first  blush.    It   is
    unnecessary  to   address  an   allegedly  erroneous   sentencing
    computation if,  and to the  extent that, correcting it  will not
    change  the applicable offense  level or otherwise  influence the
    defendant's  GSR (and,  ultimately, his  sentence).   See  United
    States  v. Connell,  
    960 F.2d 191
    , 198  n.11  (1st Cir.  1992);
    Bradley, 
    917 F.2d at 604
    ; see also Williams v. United States, 
    112 S. Ct. 1112
    , 1121 (1992) (stating that an error in sentencing is
    harmless,  and may  be disregarded,  if  it "did  not affect  the
    district  court's  selection  of the  sentence  imposed").   This
    principle is pertinent in Cullinane's  case:  his BOL, and, thus,
    his sentence, will remain unchanged  so long as he is responsible
    for an amount of cocaine between five and fifteen kilograms.  See
    U.S.S.G.  2D1.1(c)(6) (Drug  Quantity Table).  His  appeal fails,
    then,  if there  is record  support for  ascribing at  least five
    kilograms of cocaine to him.
    We find  this to  be the case.   Although  the district
    court  relied  on the  testimony  of  a  number of  witnesses  to
    buttress the  drug quantity it  attributed to Cullinane,  we need
    not go beyond the testimony of David Chase.  Chase stated that he
    bought somewhere between five and eight kilograms of cocaine from
    Cullinane.  The district court  found this testimony credible and
    78
    we,  therefore, give  it  weight.    At  sentencing,  credibility
    determinations  are the  province  of the  district  court.   See
    United States v.  Brewster, 
    1 F.3d 51
    , 55 (1st  Cir. 1993);  St.
    Cyr, 
    977 F.2d at 706
    ; see also 18  U.S.C.   3742(e) (1988).  That
    ends  the matter:   the  lowest  of Chase's  estimates affords  a
    sufficient predicate for the disputed sentence.
    Cullinane  attempts  to  confess and  avoid.    Even if
    Chase's  testimony is reliable,  he ruminates, the  conduct Chase
    describes is irrelevant to the charged conspiracy.  This maneuver
    takes  appellant  down  a  blind alley.    Within  broad  limits,
    reviewing courts must defer to a sentencing judge's determination
    of  relevant  conduct.    Such  findings  are  almost  invariably
    factbound, and  we will set them aside only  if they are shown to
    be clearly  erroneous.  See Garcia, 
    954 F.2d at 16
    ; Bradley, 
    917 F.2d at 605
    .   In addition, the argument for deference peaks when
    the sentencing  judge has  presided over a  lengthy trial  and is
    steeped in the  facts of the case.   See, e.g., United  States v.
    Shattuck, 
    961 F.2d 1012
    , 1014-15 (1st Cir.  1992); United States
    v. Zuleta-Alvarez, 
    922 F.2d 33
    , 37 (1st Cir. 1990), cert. denied,
    
    111 S. Ct. 2039
     (1991).
    These salutary  precepts are  dispositive  here.   Full
    deference is  due and  Chase's testimony, though  circumstantial,
    touched upon,  and could logically  be found to  involve, matters
    coming  within  the scope  of the  conspiracy.   Accordingly, the
    lower court  did  not  commit  clear  error  in  concluding  that
    Cullinane's transactions  with Chase  comprised relevant  conduct
    79
    for sentencing purposes.
    D.  Arline Welch.
    The  district court attributed 1924 grams of cocaine to
    Arline  Welch  and imposed  the  mandatory  minimum incarcerative
    sentence under 21 U.S.C.   841(b)(1)(B), viz., five years.  Welch
    contests  only the  district  court's drug  quantity  assessment.
    Because  the mandatory minimum  applies so long  as quantities of
    cocaine totalling 500  grams or more are involved  in the offense
    of conviction,  see 
    id.,
     we  need only inquire whether  that much
    contraband can fairly be attributed to her.
    We answer this  query affirmatively.   Perez  testified
    that  Arline Welch accompanied him  on three journeys to Lawrence
    and that 10  ounces of cocaine were  acquired on each trip.   The
    district court credited Perez's testimony, attributing nearly 900
    grams of  cocaine to  Arline Welch on  this account.   We decline
    appellant's invitation to second-guess this finding.
    E.  Edward Welch.
    The district court attributed 7.72 kilograms of cocaine
    to Edward Welch and, after various interim adjustments, sentenced
    him to  135 months  in prison (the  low end  of the GSR).   Welch
    challenges only the drug quantity assessment.
    The  court's  attribution  of cocaine  to  Edward Welch
    rests upon a cornucopia of  testimony.  It would serve  no useful
    purpose to survey it all.  Upon  careful review of the record, we
    can see, at a minimum, no clear error in the court's  decision to
    accept the testimony  of Coriaty and Milne    testimony that was,
    80
    in  itself, sufficient  to support  the attribution  of over  5.3
    kilograms to  this defendant.33   At this  point, Welch's  ground
    of appeal collapses,  for his sentence  would be the same  if the
    court had  found 5.3 kilograms  rather than 7.72 kilograms.   See
    U.S.S.G.  2D1.1(c)(6) (Drug Quantity Table).
    F.  Cheryl Johnson.
    The  lower court attributed 1.2 kilograms of cocaine to
    Cheryl  Johnson  and  imposed  the  mandatory  minimum  five-year
    sentence.   See 21 U.S.C.    841(b)(1)(B).  Johnson  disputes the
    drug quantity  finding.  Here,  again, the trigger amount  is 500
    grams of cocaine.  See 
    id.
    The district court determined, inter alia, that Johnson
    sold 1/16th  of an  ounce of cocaine  to Santos  on at  least 100
    occasions; and that she sold 3/10s of an ounce to  officer Malone
    on another occasion.  The  court further found that $7,115 seized
    from  Johnson's house constituted the proceeds of drug sales and,
    for sentencing purposes, equated this cash stash with 5.08 ounces
    of cocaine.   Finally, the court credited  Perez's testimony that
    Johnson  participated in  at  least  "a  couple"  of  drug-buying
    expeditions.   Erring  on the  side of  caution, the  court could
    warrantably   have  found  Johnson  responsible  for  two  trips,
    33At the  risk of carrying  coal to Newcastle, we  note that
    Edward Welch  was a  fellow traveller on,  and a  co-venturer in,
    several  drug-buying  expeditions  described  supra  Part  XI(D).
    Thus, the drug  quantities associated with those  jaunts are also
    attributable to him.
    81
    involving  four  ounces  per  trip.34    In  the  aggregate,  the
    determinations  listed above support the attribution of 556 grams
    of  cocaine  to Johnson     more  than  the minimum  required  to
    underbrace the sentence she received.
    Johnson  argues against these  serial findings on three
    grounds.  Her first attack   a broadside blast aimed at the total
    quantity  of cocaine attributed to her   deserves little comment.
    We simply restate the obvious:   the district court's credibility
    calls  are  beyond  reproach   and,  therefore,  its  bottom-line
    conclusion is not clearly erroneous.
    Johnson's  second  fusillade  is  aimed   at  the  cash
    equivalency finding.  In drawing a head on the sentencing court's
    decision to  translate dollars  into drugs,  Johnson is  shooting
    blanks.   The government presented abundant evidence of Johnson's
    narcotics trafficking, see  supra Part II(D),  and the volume  of
    business  transacted justified the court's illation that the sums
    seized  were  connected  to  her  drug  dealings.    When  it  is
    reasonably probable that confiscated cash  represents either drug
    profits   or  money  dedicated   to  the  upcoming   purchase  of
    contraband,   a  sentencing  court  may  convert  the  cash  into
    equivalent  amounts of narcotics for "relevant conduct" purposes.
    See U.S.S.G.   2D1.4, comment. (n.2) (authorizing district courts
    to use price as a means of approximating drug quantity); see also
    34The court actually found that Johnson's two trips involved
    16 ounces per trip.   But, this finding utilized an impermissible
    process of rote averaging.  See supra  Part XI(B).  Hence, we use
    the low end of the range  of available estimates for purposes  of
    appellate review.
    82
    United States v. Jackson, 
    3 F.3d 506
    , 510 (1st Cir. 1993); United
    States v. Figueroa, 
    976 F.2d 1446
    , 1460-61 (1st Cir. 1992), cert.
    denied, 
    113 S. Ct. 1346
     (1993); United  States v.  Gerante, 
    891 F.2d 364
    , 369 (1st Cir. 1989).  So it is here.
    Johnson's  third salvo also  flies wide of  the target.
    She insists that the cash did not belong to her and, thus, cannot
    figure  in  her  sentence.   But  as  we  read  the  record,  the
    circumstantial  evidence   supports  a  finding   of  proprietary
    interest.   And, moreover, even  if we were  to give credence  to
    Johnson's  protest  regarding  ownership,  the  cash  equivalency
    evidence could  be used against  her as  long as  the drug  money
    constituted part  of the same common  scheme or plan  and met the
    foreseeability  requirement   for  relevant  conduct   under  the
    guidelines.  See Garcia, 
    954 F.2d at 15
    ; Blanco, 
    888 F.2d at
    910-
    11; see also  supra Part  XI(A) (discussing  relevant conduct  in
    conspiracy  cases).    The  evidence  here  could  reasonably  be
    interpreted as  placing the  cash stash within  the orbit  of the
    conspiracy.   For these reasons, we detect  no clear error in the
    lower  court's conclusion  that the  money ought  properly to  be
    treated  as  a  proxy  for  cocaine  and  counted   against  this
    appellant.
    Johnson  has two  final  items  in  her  asseverational
    array.  She asserts that the court should have reduced her BOL by
    two levels since  she was merely a minor participant  in the drug
    distribution scheme, see  U.S.S.G.  3B1.2(b), and that  the court
    should  have departed downward  due to her  family circumstances.
    83
    Neither assertion has much firepower.
    As  to   the  former   plaint,  a   role-in-the-offense
    reduction,  even if granted, would  have no effect on appellant's
    sentence  due to the  overriding force  of the  mandatory minimum
    prescribed by 21 U.S.C.    841(b)(1)(B).  See U.S.S.G.   5G1.1(b)
    (providing that  the statutorily required  minimum sentence shall
    be  the  guideline  sentence  when  it exceeds  the  top  of  the
    applicable GSR).  The assignment of error is, therefore, moot.
    As  to  Johnson's last  point,  it is  settled  in this
    circuit  that a  sentencing  judge's  informed  decision  not  to
    depart, regardless of direction, is a non-appealable event.   See
    United States  v. Tardiff, 
    969 F.2d 1283
    , 1290 (1st  Cir. 1992);
    United  States v.  Hilton, 
    946 F.2d 955
    , 957  (1st Cir.  1991).
    There is nothing about  appellant's case that extricates it  from
    the vice-like  grip of this  jurisdictional rule.  In  any event,
    appellant failed  to seek  a departure below  and, hence,  cannot
    broach the matter for the first  time on appeal.  See Ortiz,  
    966 F.2d at 717
     (reiterating  rule  that appellate  court  will not
    address  sentencing arguments that  were not  seasonably advanced
    below); United States v.  Dietz, 
    950 F.2d 50
    , 55  (1st Cir. 1991)
    (similar).
    XII.  CONCLUSION
    We  need go  no  further.   After  considering all  the
    issues   raised  by   appellants,  including   some  issues   not
    specifically  discussed herein, we  have unearthed no  vestige of
    reversible error.    Appellants' convictions  and  sentences  are
    84
    therefore lawful, save only for the sentences imposed on Rood and
    Wallace.   Accordingly, we affirm  the convictions  of those  two
    appellants, vacate their sentences,  and remand for resentencing.
    At the same  time, we affirm the convictions and sentences of the
    other eight appellants.   We stay issuance of mandate in  all the
    appeals, pending publication  of the two additional  (and closely
    related) opinions described supra note 2.
    The  convictions  and  sentences  of  appellants  David
    Sepulveda,  Edgar  Sepulveda,  Edward W.  Welch,  Jr.,  Arline S.
    Welch, Kevin Cullinane, Cheryl T. Johnson, Richard F. Labrie, and
    Ernest F. Langlois are affirmed in all respects.  The convictions
    of appellants  Tony  Rood and  William D.  Wallace are  affirmed,
    their sentences  are vacated, and,  as to those  appellants only,
    the case is  remanded for resentencing.  The  issuance of mandate
    is stayed pending further order of the court.
    85
    

Document Info

Docket Number: 92-1362, 92-1574, 92-1364, 92-1366, 92-1367, 92-1369, 92-1371, 92-1373 to 92-1375, 92-1573 and 92-1629

Citation Numbers: 15 F.3d 1161

Judges: Boudin, Cyr, Selya

Filed Date: 12/20/1993

Precedential Status: Precedential

Modified Date: 10/19/2024

Authorities (125)

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United States v. Joseph Capone, United States of America v. ... , 683 F.2d 582 ( 1982 )

Lockett v. Ohio , 98 S. Ct. 2954 ( 1978 )

Rawlings v. Kentucky , 100 S. Ct. 2556 ( 1980 )

Williams v. United States , 112 S. Ct. 1112 ( 1992 )

United States v. Padilla , 113 S. Ct. 1936 ( 1993 )

Daubert v. Merrell Dow Pharmaceuticals, Inc. , 113 S. Ct. 2786 ( 1993 )

united-states-v-robert-d-cresta-united-states-of-america-v-john-j , 825 F.2d 538 ( 1987 )

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