United States v. Alvarez ( 1993 )


Menu:
  • March 11, 1993
    UNITED STATES COURT OF APPEALS
    FOR THE FIRST CIRCUIT
    No. 91-1286
    UNITED STATES,
    Appellee,
    v.
    VICTOR MANUEL ALVAREZ,
    Defendant, Appellant.
    No. 91-1287
    UNITED STATES,
    Appellee,
    v.
    DIANA MATOS,
    Defendant, Appellant.
    APPEALS FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF PUERTO RICO
    [Hon. Carmen C. Cerezo, U.S. District Judge]
    Before
    Torruella, Circuit Judge,
    Campbell, Senior Circuit Judge,
    and Skinner,* Senior District Judge.
    Rachel  Brill,  Assistant   Federal  Public  Defender,  with  whom
    Benicio  Sanchez Rivera,  Federal Public  Defender, was  on brief  for
    appellant Victor Manuel Alvarez.
    Joseph C.  Laws, Jr., by Appointment  of the  Court, for appellant
    Diana Matos.
    Ivan  Dominguez,  Assistant  United  States  Attorney,  with  whom
    Daniel  F. Lopez  Romo, United  States Attorney,  and Jose  A. Quiles-
    Espinosa, Senior Litigation Counsel, were on brief for appellee United
    States.
    March 11, 1993
    *Of the District of Massachusetts, sitting by designation.
    SKINNER, District Judge.
    Appellants Victor M. Alvarez and  Diana Matos, common
    law  husband and  wife,  were convicted  by  a jury  in  the
    District of Puerto Rico for aiding and abetting several drug
    offenses.1    Miguel Flores,  though  not  a party  to  this
    appeal nor  convicted in the  same trial,  played a  central
    role in  the alleged cocaine trafficking  scheme and pleaded
    guilty  to  the  identical  charges.    Appellants  defended
    against  the  charges  alleging  that  they  were  unwitting
    participants  in  defendant   Flores'  cocaine   trafficking
    scheme.  Flores  offered testimony  to the same  end.   Each
    appellant advances numerous grounds for reversal.
    Appellant  Alvarez  appeals his  convictions alleging
    that the  district court  (1) erroneously refused  to accept
    defendant Flores' guilty plea prior to the trial  of Alvarez
    and Matos,  (2) improperly prohibited Flores from testifying
    that  his testimony  exposed him  to criminal  penalties for
    cocaine trafficking, and (3)  errored in denying appellant's
    1 Alvarez  and Matos were  convicted for  the possession  of
    cocaine  with intent to distribute in violation of 18 U.S.C.
    2 and 21 U.S.C.    841(a)(1); the  importation of cocaine
    into the customs territory of the United States in violation
    of 18 U.S.C.    2 and 21 U.S.C.   952(a); and the failure to
    declare  cocaine in the cargo manifest or supply list of the
    aircraft which  brought them  into the customs  territory of
    the  United States  in violation  of 18  U.S.C.    2 and  21
    U.S.C.   955.
    -3-
    3
    motion for judgment of acquittal.  We affirm with respect to
    Alvarez.
    Appellant Matos  joins the arguments  of Alvarez  and
    further appeals her convictions,  alleging that the district
    court  failed  to  exclude  government   evidence  that  was
    produced in violation of Rule 16, Federal Rules  of Criminal
    Procedure.   As  to  Matos, we  reverse  and remand  to  the
    district court for a new trial.
    I.     Evidence
    We recite  the evidence in  the light most  favorable
    to the  prosecution.   United States  v. Campbell,  
    874 F.2d 838
    ,  839  (1st Cir.  1989).   The  evidence showed  that on
    December 8, 1989, Victor M. Alvarez, Diana Matos, and Miguel
    A.  Flores arrived  at  the Luis  Munoz Marin  International
    Airport, San Juan, Puerto  Rico, on American Airlines flight
    904  from Caracas,  Venezuela.   A  U.S. Customs  Inspector,
    Francis Aponte, noticed that  the three individuals appeared
    to be nervous and were talking secretively among themselves.
    Inspector  Aponte approached  the individuals,  made routine
    inquiries of them,  and referred the group  to the secondary
    inspection station (a table used to examine the contents  of
    a passenger's luggage).  At that time, appellant Alvarez was
    -4-
    4
    permitted   to  leave  the  customs  enclosure  to  purchase
    airplane tickets to New  York for each member of  the group.
    Inspector Aponte testified on  cross-examination that he had
    not  made  any  written  record of  the  group's  suspicious
    behavior  even though  such information  would have  been an
    important part of the case report.
    Carlos  Ortiz,   also  a   U.S.  Customs   Inspector,
    testified  that he noticed two individuals, later identified
    as Flores and  Matos, pushing two carts stacked with luggage
    and  that  he motioned  for them  to approach  his secondary
    station.    Inspector  Ortiz requested  Matos'  and  Flores'
    customs declaration cards,  noting that both cards  appeared
    to  have  been  filled  out  by  the  same  person.    Matos
    complained that  the airline had  broken a bottle  of liquor
    that she packed in  her suitcase.  During his search  of the
    luggage, Ortiz noticed that the luggage contained both men's
    and women's  clothing and  he discovered a  heavy, newspaper
    wrapped  package.   Ortiz unwrapped  the package to  find an
    aged  painting of  a young  girl in a  wooden frame.   Ortiz
    asked Matos if she had purchased the picture on her trip, to
    which she answered "yes."
    Inspector Ortiz  consulted with  a senior  inspector,
    took  the picture  to a  search room,  and drilled  into the
    -5-
    5
    picture frame using a  small drill bit.  Ortiz  discovered a
    white  powdery substance  inside the  wooden frame,  which a
    field test  indicated was  cocaine.   Matos and  Flores were
    arrested  and searched.    Customs  inspectors then  located
    Alvarez in the airport's main concourse and placed him under
    arrest.    Inspectors conducted  a  thorough  search of  the
    group's  luggage,  finding  two  additional  paintings  that
    concealed cocaine  and discovering false bottoms  in each of
    the  six suitcases  that  also concealed  cocaine.   Customs
    agents  determined  that the  group  carried  more than  ten
    kilograms of cocaine.
    A grand  jury returned a  three count indictment  on
    January 3,  1990, against Matos, Alvarez, and  Flores.  Each
    defendant pleaded  not guilty.   On October 2,  1990, Flores
    filed  a  notice  to  plead  guilty  on  one  count  of  the
    indictment.   It appears,  however, that Flores  intended to
    plead guilty on all three counts, and on October 5, 1990, he
    amended his petition accordingly.   On October 5, 1990,  the
    district   court   extensively   questioned  Flores   before
    declining  to accept his plea.  Flores asserted that Alvarez
    and Matos had been unaware of any plan to import cocaine and
    that he, himself, was solely responsible for the crime.  The
    judge  suspended  the  proceeding  because  she  was  unsure
    -6-
    6
    whether Flores could plead  guilty to aiding and  abetting a
    crime while  simultaneously proclaiming the innocence of the
    other alleged participants.
    On October 9, 1990, the Flores plea hearing  resumed.
    The judge explained that  Flores' refusal to acknowledge the
    aiding  and abetting  modality did  not preclude  his guilty
    plea.   The court then engaged in an extensive colloquy with
    defendant Flores in accordance  with Rule 11 of the  Fed. R.
    Crim. P.   The judge  noted that Flores  had proclaimed  the
    innocence of Alvarez and Matos in a confidential letter that
    Flores had  written  to  the  judge  from  prison.    Flores
    confirmed sending the  letter and explained that  appellants
    were friends  of his  from  New York,  the home  of all  the
    parties.  Flores  had invited  appellants to join  him on  a
    cruise from San Juan to several caribbean islands, including
    a stop in Caracas,  Venezuela.  While on the  cruise, Flores
    met  a man who offered  him three thousand  dollars to bring
    several  pictures from  Venezuela  to Puerto  Rico.   Flores
    agreed to  meet the man at  a hotel in Caracas  and to carry
    the pictures into Puerto Rico as a passenger on a commercial
    airline.   Flores  did  not tell  Alvarez  or Matos  of  his
    scheme.
    -7-
    7
    Flores, Alvarez,  and Matos  left the  ship while  it
    was in  port in Caracas to visit  the beach.  Flores claimed
    to  have  tricked the  appellants  into  missing the  ship's
    scheduled departure because he did not want to fly to Puerto
    Rico alone.  After missing the ship, Flores took Alvarez and
    Matos to the predesignated hotel, checked the group into two
    rooms, secretly picked up the pictures, and borrowed several
    pieces  of luggage from  the man  after explaining  that the
    group  had left  their  bags on  the  cruise ship.    Flores
    arranged to meet the man in Puerto Rico at which time Flores
    would deliver the pictures  and return the borrowed luggage.
    Flores  claimed that he never  saw the cocaine  or even knew
    for certain  that he  was carrying cocaine,2  but "imagined"
    that the  frames concealed cocaine because  "nobody is going
    to pay you  three thousand  dollars just to  bring in  three
    pictures."   Flores  also denied  knowing that  the borrowed
    suitcases concealed cocaine.  Flores explained that Alvarez,
    Matos, and  he purchased  new cloths  in  Caracas and  spent
    several days in the  hotel before returning to  Puerto Rico.
    Flores  packed  the  three  pictures in  separate  bags  and
    2 Flores explained to the  judge, "At no time did  [the man]
    tell me  it was cocaine.   He told  me, ``I want  you to take
    these pictures  for me.   Take  them there.'   He  says, ``it
    doesn't contain anything dangerous.'"
    -8-
    8
    covered them with cloths.  Flores maintained that appellants
    were totally  unaware of  his trafficking scheme  during the
    entire trip.
    The district court declined Flores' plea, stating:
    Now, you have stated that you  did not know what  was
    in the picture frames, you did  not know what was  in
    any of the luggage that you  carried.  That in itself
    carries with it a defense  that you could  present to
    the jury.   So I am  not convinced that you have made
    a  plea of  guilty that  I  could  accept that  has a
    basis  in fact  that  contains all  elements  of  the
    offenses  charged  which  is a  requirement  for  the
    court  to accept your  plea of  guilty.   Among those
    elements, those of knowledge and intent.
    Flores  then moved  to  sever his  trial  from that  of  the
    appellants.  Finding that it would be impossible to mount an
    adequate defense if Flores testified in favor of Alvarez and
    Matos, the district court  granted both the motion to  sever
    Flores'  trial  and  Flores'   request  to  be  tried  after
    appellants.
    At  trial,  Matos called  Flores  as  a  witness  who
    offered essentially the same testimony as given to the judge
    during his  attempted plea.  During  examination by Alvarez,
    Flores was permitted to testify that it was a crime to bring
    cocaine  into the United States, but he was not permitted to
    testify as to the  punishment that could be imposed  for his
    crime or as  to his  aborted plea attempt.   The jury  found
    Matos and Alvarez guilty on all charges.
    -9-
    9
    One  week  later,  Flores   again  came  before   the
    district  court to offer his  guilty plea, but  this time he
    admitted  that  he knew  cocaine  was  concealed within  the
    picture frames.  The court accepted his plea.
    II.    Alvarez's Conviction
    Appellant  Alvarez  attacks  his conviction  on three
    fronts.    First,  Alvarez  alleges  that  his  defense  was
    prejudiced because the district  court erroneously failed to
    accept defendant Flores'  guilty plea prior to the  trial of
    Alvarez  and Matos.    Alvarez claims  the  judge relied  on
    "perceived technical deficiencies" with Flores' plea, rather
    than  crediting   the  weight  of   Flores'  testimony  that
    indicated he  accepted full  responsibility  for the  crime.
    This error, Alvarez argues,  prejudiced his defense  because
    he  was deprived of  the opportunity  to put  Flores' guilty
    plea before the jury  as persuasive evidence of Mr.  Flores'
    credibility and sincerity.
    We  are  unpersuaded  by  appellant's  argument.    A
    criminal  defendant has  no  constitutional right  to  plead
    guilty.   North  Carolina v.  Alford, 
    400 U.S. 25
    ,  38 n.11
    (1970)   (a   trial   judge    need   not   "accept    every
    -10-
    10
    constitutionally   valid  guilty   plea  merely   because  a
    defendant wishes so  to plead").   Nor does Rule  11 of  the
    Federal  Rules of  Criminal Procedure  create such  a right.
    United States  v. Bednarski, 
    445 F.2d 364
    ,  365-66 (1st Cir.
    1971).    Here, the  district  court  conducted a  prolonged
    hearing  to determine  the sufficiency  of Flores'  plea and
    carefully  considered his  testimony.   While  Alvarez might
    reach  a  different  conclusion  than the  judge  as  to the
    factual sufficiency  of Flores'  attempted plea, we  find no
    error in district court's determination.
    Second,  Alvarez  alleges  that  the  district  court
    violated both the  Compulsory Process and the  Confrontation
    Clauses of  the Sixth  Amendment by improperly  limiting the
    scope  of  Flores'  testimony  and,  thereby,  depriving the
    defendants of  forceful evidence  of  Flores' sincerity  and
    credibility.   On  direct examination,  Matos  asked Flores,
    "You  have testified  under  oath  regarding the  exceptance
    [sic]  of  a  criminal  offense.    Are  you  aware  of  the
    punishment that could be imposed for this crime?"
    The   district   court  sustained   the  government's
    objection  to the  question, reasoning  that Flores  had not
    actually  pleaded guilty and that  he might or  might not be
    found guilty at a later  trial.  Moreover, Flores' testimony
    -11-
    11
    would not necessarily be  admissible against him in  his own
    trial unless he  chose to testify  in his own defense.   The
    judge  did, however,  allow Matos  to ask  Flores if  he had
    previously asserted the appellants' innocence.
    Alvarez  then  conducted  what he  termed  a  "cross-
    examination" of Flores -- a characterization rejected by the
    trial court.   The government argued that even though Flores
    was not a joint witness of the appellants, cross-examination
    was  unavailable because  Flores was  clearly  testifying in
    Alvarez's favor.  Though  we are inclined to agree  with the
    trial  court, we need not decide the issue because Alvarez's
    Sixth  Amendment  objection  fails  regardless  of  how  the
    examination  is  characterized.    Flores  was permitted  to
    testify on "cross-examination"  that he knew it  was a crime
    to  bring cocaine  into the  United States  and that  he had
    "wanted to talk about [his story] for some time."
    The  Confrontation  Clause  of  the Sixth  Amendment
    provides that  "[i]n all criminal prosecutions,  the accused
    shall  enjoy the  right  . .  .  to be  confronted  with the
    witnesses  against  him."    Cross-examination,  the primary
    interest  secured  by  the  Confrontation  Clause,  is  "the
    principal means by which the believability of a witness  and
    the  truth  of  his  testimony are  tested."    Kentucky  v.
    -12-
    12
    Stincer, 
    482 U.S. 730
    , 736 (1987)  (quoting Davis v. Alaska,
    
    415 U.S. 308
    ,  316  (1974)).    The  Confrontation  Clause
    "mandates  a ``minimum  threshold of  inquiry' be  afforded a
    defendant  in the  cross-examination of  adverse witnesses,"
    Brown  v. Powell,  
    975 F.2d 1
    , 5  (1st Cir.  1992) (quoting
    United States  v.  Jarabek,  
    726 F.2d 889
    ,  902  (1st  Cir.
    1984)), cert. dismissed, 
    122 L. Ed. 2d 179
     (1993),  but the
    right  to  cross-examination is,  of  course, not  absolute.
    Trial judges  retain broad  discretion to impose  reasonable
    limits on the scope  of cross-examination.  Delaware  v. Van
    Arsdall, 
    475 U.S. 673
    , 679 (1986).  On appeal, we review to
    determine:
    whether  the jury  had  sufficient  other information
    before it, without  the excluded evidence, to make  a
    discriminating appraisal  of the  possible biases and
    motivations of the witnesses.
    Brown, 
    975 F.2d at 5
     (quoting United States v.  Tracey, 
    675 F.2d 433
    , 437 (1st Cir.  1982)).  The issue here  is whether
    the  district court  abused its  discretion and  committed a
    reversible error when it prevented the jury from learning of
    the  exact penalties that Flores would  face if convicted of
    cocaine  trafficking.   We conclude  the court  committed no
    error.
    Flores was  allowed to  put his  entire story  before
    the jury, including important information that supported his
    -13-
    13
    credibility.   The jury heard Flores  testify that importing
    cocaine into the U.S. is a crime.  We are confident that the
    jury knew that  a conviction for importing  a large quantity
    of cocaine carries  a serious punishment.   Though the  jury
    did  not  learn of  the  precise  penalty imposed  for  drug
    trafficking or  that Flores  had attempted to  plead guilty,
    the  decision  to  exclude  this  evidence  was  within  the
    district court's  discretion.    The  judge  could  properly
    conclude that  such testimony  might mislead or  confuse the
    jury;  particularly where,  as here,  the witness  sought to
    testify to the same penalties faced by the defendants.
    We   note  that  Sixth   Amendment  right  of  cross-
    examination  is  directed  at  uncovering  witness bias  and
    untruthfulness.   In this  case, however, Alvarez  sought to
    use "cross-examination" to bolster the witness' credibility.
    Contrary to  appellant's assertion, exposing a witness' bias
    to lie  can,  indeed, be  more  important than  exploring  a
    witness' motivation  for telling  the truth.    Cf. Fed.  R.
    Evid. 608 (evidence of truthful character is admissible only
    after the character of the witness for truthfulness has been
    attacked);  Fed. R.  Evid  801 (prior  consistent statements
    generally  admissible only  to rebut  an express  or implied
    -14-
    14
    charge  of  recent  fabrication  or  improper  influence  or
    motivation).
    Alvarez  also   asserts  that   the  district   court
    violated  the   Compulsory  Process  Clause  of   the  Sixth
    Amendment.    According  to  Alvarez,   the  district  court
    interfered   with  his   constitutional  right   to  present
    witnesses  in his own defense  when it excluded an important
    portion  of  Flores'  testimony  that weighed  in  favor  of
    Flores'   credibility.     The  Compulsory   Process  Clause
    guarantees every criminal defendant "the right . . . to have
    compulsory  process for obtaining witnesses in his favor . .
    ."    This  fundamental  right, however,  is  not  absolute.
    Campbell, 
    874 F.2d at 851
    ; Chappee v. Vose, 
    843 F.2d 25
    , 28
    (1st  Cir. 1988).   The  Supreme Court  has explained,  "The
    Sixth  Amendment  does  not  confer  the  right  to  present
    testimony   free  from   the  legitimate   demands   of  the
    adversarial system . . ."  United States v. Nobles, 
    422 U.S. 225
    , 241 (1975).  As explained more fully above, we conclude
    that  the district  court  acted properly  to limit  Flores'
    testimony which might have mislead or confused the jury.
    Third,  Alvarez  complains that  the  district  court
    errored  in denying  his  Rule  29  motion for  judgment  of
    -15-
    15
    acquittal.3    Alvarez   contends  that  the   evidence  was
    insufficient  to prove beyond a reasonable doubt that he was
    an active participant in  the scheme to import cocaine.   We
    review the  evidence to determine whether the  evidence as a
    whole, taken in the light most favorable to the prosecution,
    together with  all  reasonable inferences  favorable to  it,
    would  allow a  rational fact  finder to  conclude  beyond a
    reasonable doubt  that the defendant was  guilty as charged.
    United  States v.  Maraj,  
    947 F.2d 520
    ,  522-23 (1st  Cir.
    1991); United States  v. Vargas, 
    945 F.2d 426
    , 427-28  (1st
    Cir.  1991).   A conviction may  be grounded in  whole or in
    part on  circumstantial evidence.   Maraj, 
    947 F.2d at 523
    .
    Moreover,  because   the   jury  is   entrusted   with   the
    responsibility for making credibility determinations  and is
    empowered  to accept  or  reject, in  whole  or in  part,  a
    witness' testimony, we will not weigh witness credibility on
    appeal.  Maraj, 
    947 F.2d at 523
    ; Vargas, 
    945 F.2d at 427
    .
    3 Rule 29 provides in relevant part,
    The court  on motion  of a  defendant or  of its  own
    motion  shall   order  the   entry  of  judgment   of
    acquittal  of one  or more  offenses charged  in  the
    indictment  or  information  after  the  evidence  on
    either   side   is  closed   if   the   evidence   is
    insufficient to sustain a  conviction of such offense
    or offenses.
    Fed. R. Crim. Proc. 29.
    -16-
    16
    Guilt for  aiding and  abetting  attaches only  where
    "the   defendant  associated   himself  with   the  venture,
    participated in it as in something he wished to bring about,
    and  sought  by his  actions to  make  it succeed."   United
    States  v. Rodriguez  Cortes, 
    949 F.2d 532
    ,  539 (1st  Cir.
    1991).  Neither mere association with the principal nor mere
    presence  at the scene of  a crime, even  when combined with
    knowledge that a crime was to be committed, is sufficient to
    establish aiding  and abetting liability.   United States v.
    Aponte-Suarez, 
    905 F.2d 483
    ,  491 (1st Cir.) (quoting United
    States  v. Francomano, 
    554 F.2d 483
    , 486  (1st Cir. 1977)),
    cert. denied, 
    111 S. Ct. 531
     (1990).   Guided    by    these
    standards  of  review,  we  are  persuaded   that  Alvarez's
    conviction  is supported  by  sufficient evidence  of guilt.
    There is  no  dispute  that  Alvarez was  traveling  for  an
    extended period of  time with  Matos and Flores  and that  a
    very large quantity of cocaine was concealed  in the luggage
    carried  by  the  group.    Moreover,  there  is  sufficient
    evidence upon which a  reasonable jury could conclude beyond
    a reasonable doubt that Alvarez participated in or sought to
    assist Flores' scheme to import cocaine into the U.S.
    The  evidence established  that  a  Customs Inspector
    noticed the group talking "secretively" at the airport; that
    -17-
    17
    two of the  bags that  concealed cocaine  carried name  tags
    bearing  Alvarez's name; and that Alvarez and his common law
    wife  had  no means  of  support  other than  welfare,  food
    stamps,  and odd jobs and,  yet, they could  still afford to
    fly  to Puerto  Rico, travel  on  a cruise  ship, stay  in a
    Venezuelan hotel  for several days, and  purchase new cloths
    to  replace those purportedly left  on the cruise  ship.  In
    addition, the  government  was  able  to  highlight  certain
    inconsistencies  in the  testimony  offered  by  Flores  and
    Matos.4    Most  significantly, the  government  produced  a
    photograph apparently  taken on the cruise  ship that showed
    Matos wearing  a striped dress  that according to  her story
    was not purchased until after she disembarked from the  ship
    in  Caracas.    Matos  explained  that  she  was  apparently
    mistaken about  the items of  clothing she carried  with her
    when  she left  the ship.   The  government  also introduced
    evidence that the cruise  ship operators searched the cabins
    used  by Matos,  Alvarez, and  Flores and  did not  find the
    luggage  purportedly left  behind  by the  appellants.   The
    witness, however, did not conduct the search himself and had
    no knowledge of how the search was conducted.
    4 Alvarez did not testify at trial.
    -18-
    18
    Though  the   evidence   against   Alvarez   is   not
    overwhelming, when it is viewed in a light most favorable to
    the  prosecution it  is sufficient  to support  the verdict.
    We, therefore, affirm Alvarez's conviction.
    III.   Matos' Conviction
    In addition to  joining in the arguments advanced  by
    Alvarez, Matos contends that her conviction must be reversed
    because  the government  presented in  its  case-in-chief an
    oral statement allegedly made  by Matos which the government
    failed to disclose during pre-trial discovery as required by
    Fed.  R. Crim. P. Rule 16.  Specifically, Matos challenges a
    portion of  the testimony  given  by Officer  Ortiz, a  U.S.
    Customs  Inspector who  searched  Matos' luggage.    Officer
    Ortiz  testified that during the  search he asked   Matos if
    she  had purchased  the picture  on her  trip, to  which she
    answered  "yes."   Ortiz's  testimony  was  the only  direct
    evidence that the incriminating picture belonged to Matos.
    The substance of Officer Ortiz's testimony came as  a
    surprise to Matos because she had made two prior requests of
    the  government -- first by  letter on January  11, 1990 and
    second by formal  motion on  January 22, 1990  -- to  comply
    with  the  discovery  provisions  of Rule  16,  including  a
    -19-
    19
    specific request for any "oral statement[s of the defendant]
    which the  Government intends  to offer in  evidence at  the
    trial."  The government responded by expressly acknowledging
    its  obligations  under Rule  16  and  by producing  several
    documents.   The  government,  however, made  no mention  of
    Matos'  alleged statement at that time or at any time before
    the damaging testimony  came before the jury.  During cross-
    examination, Officer Ortiz admitted that his prior testimony
    at a preliminary  hearing and  before a grand  jury did  not
    include any reference to Matos' alleged statement concerning
    the picture.
    The  following morning, Matos moved to strike Officer
    Ortiz's  testimony and for the court to admonish the jury to
    disregard  the testimony.    Matos argued  that  prosecution
    records showed that Officer Ortiz had told the government of
    Matos'  alleged  statement  in  April  1990,  but  that  the
    government failed to produce  the statement despite repeated
    requests by  Matos.   The judge  denied  the motion  without
    giving an explanation.
    Rule 16  imposes an obligation  on both the  criminal
    defendant and the  government to produce or  disclose to the
    opposing party  certain relevant  evidence  prior to  trial.
    -20-
    20
    The  provisions of Rule 16(a)(1)(A) in effect at the time of
    trial provided, in relevant part:
    Upon  request of  a defendant  the government
    shall permit  the  defendant to  inspect  and
    copy  .  .  .   the  substance  of  any  oral
    statement  which  the  government intends  to
    offer in  evidence at  the trial made  by the
    defendant whether before  or after arrest  in
    response to interrogation  by any person then
    known  by the  defendant to  be a  government
    agent.
    Fed.  R. Crim.  P. 16(a)(1)(A).   These  mandatory discovery
    provisions  are  intended  to  contribute to  the  fair  and
    efficient  administration of  criminal justice  by providing
    the defendant with sufficient information upon which to base
    an intelligent a plea;  by minimizing the undesirable effect
    of surprise at trial; and by contributing to the accuracy of
    the fact finding  process.   Fed. R. Crim.  P. 16,  advisory
    committee's  note.  Where a party fails to comply with these
    discovery provisions, Rule 16 empowers the district court to
    order   the  party  to   comply  with  the   rule,  grant  a
    continuance,  exclude the  non-complying evidence,  or enter
    other  such relief as it  considers just.   Fed. R. Crim. P.
    16(d)(2).  We review a district court's ruling on the effect
    of a failure to provide pretrial discovery only for abuse of
    discretion.   United  States v. Nickens,  
    955 F.2d 112
    , 126
    (1st Cir.), cert.  denied, 
    113 S. Ct. 108
     (1992); Rodriguez
    -21-
    21
    Cortes, 
    949 F.2d at 546
    ; see Fed. R. Crim. P.  16(d)(2).  To
    succeed  in obtaining a reversal on appeal, a defendant must
    prove both an  abuse of discretion and  prejudice.  Nickens,
    955 F.2d at  126; Rodriguez  Cortes, 
    949 F.2d at 546
    .   We
    reverse.
    We  believe the  trial  court erred  when  it  denied
    Matos'  motion to exclude the alleged statement or to hold a
    suppression  hearing without  first making  a finding  as to
    whether the  government acted in bad faith and whether Matos
    was prejudiced by admission of the  statement.  We generally
    defer  to the  judgment of  a district  judge who  is better
    suited to  make factual  determinations based on  first hand
    observation  of the  evidence.  In  this case,  however, the
    judge  failed to  make  even a  threshold  inquiry into  the
    circumstances  leading to  nondisclosure  of the  statement.
    The court  neither heard evidence nor  made factual findings
    concerning the potential prejudice  flowing from a discovery
    violation, the relative importance of Ortiz's testimony, and
    the existence of prosecutorial bad faith.   See Nickens, 955
    F.2d at 126.  This was error.
    Moreover,  this  error  prejudiced  appellant  Matos.
    The alleged Matos statement provided a critical link between
    Matos and  the effort to  smuggle the cocaine  laden picture
    -22-
    22
    frame into Puerto Rico.   To establish guilt for  aiding and
    abetting,  "the  government  must prove  that  the defendant
    associated himself  with the venture, participated  in it as
    in something he  wished to  bring about, and  sought by  his
    actions  to make it succeed."  Rodriguez Cortes, 
    949 F.2d at 539
     (quoting United States v. Garcia-Rosa, 
    876 F.2d 209
    , 217
    (1st Cir. 1989), cert.  denied, 
    493 U.S. 1030
     (1990)).   The
    statement attributed  to Matos was a  very significant piece
    of evidence  that indicated Matos  was a participant  in the
    crime,  rather  than  merely  being  an  innocent  bystander
    present at the  scene of  a crime.   Similarly, the  alleged
    statement  fundamentally sabotaged  Matos' defense  that she
    was an unwitting participant in Flores'  cocaine trafficking
    venture.    There  is  a  substantial  likelihood  that  the
    statement  figured  prominently in  the  jury's decision  to
    reject  Flores'   account  of  the  incident,  which  wholly
    exculpated appellants.
    Given   the  central   importance  of   the   alleged
    statement,  the  government's  failure  to  disclose  it  as
    required by  Rule 16  had additional grave  consequences for
    Matos.    First,  Matos   was  deprived  of  any  meaningful
    opportunity  to investigate the circumstances of her alleged
    statement and to attempt to suppress it.  Significantly, the
    -23-
    23
    government disclosed during  pretrial discovery a  statement
    made  by  Alvarez,  which  Alvarez  successfully suppressed.
    Second,  not knowing  of  the alleged  statement, Matos  was
    deprived  of  the  opportunity   to  design  an  intelligent
    litigation or  plea strategy  that responded to  the alleged
    statement.
    The government  contends that  no prejudice  attached
    because "it is doubtful that counsel for appellant would not
    anticipate  or  contemplate  that  such  a  statement  might
    exist."  Even  if this argument  were not inconsistent  with
    the mandatory language of Rule 16, we would flatly reject it
    as  being  incompatible with  common  sense  and fundamental
    fairness.   The  government  also contends  that the  cross-
    examination  of  Officer  Ortiz  effectively  impeached  his
    testimony  and essentially  cured  whatever prejudice  might
    have existed.  While  we have sometimes considered effective
    cross-examination   of   witness  when   weighing  potential
    prejudice presented by that witness' testimony, Nickens, 955
    F.2d at 126; United  States v. Samalot Perez, 
    767 F.2d 1
    , 4
    (1st  Cir.  1985), those  cases  involved  the admission  of
    cumulative evidence that was regarded as harmless error.  In
    this  case,   the  alleged   statement  was  vital   to  the
    conviction.
    -24-
    24
    Finally, the government argues  that since Matos  did
    not  present the trial  judge with any  specific grounds for
    suppressing  the  alleged   statement,  the  district  court
    correctly denied  Matos' request for a  suppression hearing.
    During  a  discussion   with  Matos'   counsel,  the   judge
    repeatedly  asked  if  the  defendant  had  any  grounds  to
    suppress the  statement.  Counsel responded  that he learned
    of  the  statement  only the  day  before,  that  he had  no
    information regarding the statement, and when pressed by the
    judge,  stated  that  at that  time  he  had  no grounds  to
    suppress  the statement other than the violation of Rule 16.
    We are not surprised that Matos was unprepared to articulate
    a particular  ground  for suppressing  the  statement  under
    these circumstances and in the middle  of a trial.  The  one
    possible curative course, suspending the trial and holding a
    suppresion hearing, was erroneously rejected by the district
    court.
    The  government is  wholly responsible  for  unfairly
    surprising the defendant and should not benefit from its own
    violation of Rule 16.
    In summary, we  affirm the conviction of Alvarez  and
    reverse and remand for a new trial as to Matos.
    -25-
    25