In the Matter of a Grand Jury Investigation ( 2020 )


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    SJC-12869
    IN THE MATTER OF A GRAND JURY INVESTIGATION.
    Suffolk.      April 7, 2020. - September 8, 2020.
    Present:    Gants, C.J., Lenk, Gaziano, Lowy, Budd, Cypher,
    & Kafker, JJ.
    Grand Jury. District Attorney. Police Officer. Evidence,
    Grand jury proceedings, Testimony before grand jury,
    Immunized witness, Exculpatory, Disclosure of evidence,
    Impeachment of credibility. Practice, Criminal, Grand jury
    proceedings, Immunity from prosecution, Disclosure of
    evidence. Witness, Immunity, Impeachment, Police officer.
    Civil action commenced in the Supreme Judicial Court for
    the county of Suffolk on October 2, 2019.
    The case was reported by Cypher, J.
    William T. Harrington (Edward P. Harrington also present)
    for the petitioners.
    Shoshana E. Stern, Assistant District Attorney, for the
    Commonwealth.
    Scott P. Lewis, Samuel B. Dinning, Matthew R. Segal,
    Jessica J. Lewis, & Daniel L. McFadden, for American Civil
    Liberties Union of Massachusetts, Inc., & another, amici curiae,
    submitted a brief.
    2
    GANTS, C.J.    In 2019, the district attorney learned through
    immunized grand jury testimony that two police officers, the
    petitioners in this case, knowingly made false statements in
    their police reports that concealed the unlawful use of force by
    a fellow officer against an arrestee and supported a bogus
    criminal charge of resisting arrest against the arrestee.     The
    district attorney, to his credit, prepared a discovery letter
    describing the petitioners' misconduct and asked a Superior
    Court judge to authorize its disclosure to defense counsel as
    potentially exculpatory information in unrelated criminal cases
    where the petitioners might be witnesses.    The judge authorized
    the disclosure.    The petitioners appealed, claiming that the
    information should not be disclosed to defense counsel in
    unrelated cases because disclosure is not constitutionally
    required and would reveal information obtained from immunized
    testimony before a grand jury.    We affirm the judge's order of
    disclosure.1
    Background.    We recite the facts of this case based upon
    the information contained in the G. L. c. 211, § 3, petition and
    the parties' agreed upon statement of facts.    The petitioners
    are Fall River police officers who were present when fellow
    1 We acknowledge the amicus brief submitted by the American
    Civil Liberties Union of Massachusetts, Inc., and the
    Massachusetts Association of Criminal Defense Lawyers, Inc.
    3
    police officer, Michael Pessoa, used force while arresting an
    individual (arrestee) on February 12, 2019.   Pessoa submitted an
    arrest report concerning the arrest; the petitioners did not.      A
    few hours after the arrest, the petitioners were ordered by
    their superiors to each complete the police department's Use of
    Defensive Tactics Report (use-of-force report) because the
    arrestee was observed to have a bloody lip while being booked at
    the police station.   The petitioners are not themselves alleged
    to have used force during this incident.
    The use-of-force report is a preprinted two-page form that
    a police officer must complete after using force on a suspect or
    arrestee.   The kinds of use-of-force range from the use of a
    firearm or pepper spray, to the use of certain hands-on force,
    such as an "arm bar take down".   A use-of-force report is not an
    incident report or an arrest report; rather, it is an internal
    police department report generated to memorialize an officer's
    use of force during an encounter with an individual.   Each of
    the petitioners executed a use-of-force report that, in essence,
    adopted Pessoa's version of events as set forth in his incident
    report -- namely, that the arrestee was noncompliant, threatened
    to punch the officers, and was then taken to the ground by
    Pessoa in making the arrest.2
    2 One of the petitioners wrote: "Subject was non-compliant,
    and threatened to punch Officers. He then refused to comply
    4
    After the arrestee was charged with various offenses,
    including resisting arrest, his defense attorney provided the
    district attorney for the Bristol district with a videotape of
    surveillance footage that showed the arrest and Pessoa's use of
    force on the arrestee.3    The footage of the incident was
    inconsistent with the descriptions the petitioners provided in
    their use-of-force reports.4    Specifically, the footage showed
    that the arrestee was physically compliant when one of the
    petitioners removed his handcuffs, and that Pessoa then struck
    the arrestee on the left side of his head-shoulder area, causing
    the arrestee, according to the agreed upon statement of facts,
    "to be taken to the ground in a violent manner."5
    Prompted by the videotape, the district attorney initiated
    a criminal investigation into Pessoa's conduct.     This
    investigation resulted in a grand jury returning fifteen
    with verbal commands and was taken to the ground in an effort to
    effect an arrest." The other petitioner wrote: "Subject was
    disorderly, non-compliant, and threatened to punch officers in
    the face. Subject was subsequently taken to the ground via an
    arm bar take down." Officer Michael Pessoa's incident report is
    not part of the record on appeal.
    3 The arrestee was charged with assault and battery by means
    of a dangerous weapon (a shod foot), disorderly conduct
    (subsequent offense), disturbing the peace, threat to commit a
    crime, assault, and resisting arrest.
    4   The videotape is not part of the record on appeal.
    5 The force used by Pessoa was inconsistent with an arm bar
    take down.
    5
    indictments against Pessoa for crimes involving four separate
    arrestees, including charges for assault and battery by means of
    a dangerous weapon causing serious bodily injury, assault and
    battery, civil rights violations, witness intimidation, filing
    false police reports, and malicious destruction of property.6
    During the criminal investigation of Pessoa, the district
    attorney subpoenaed the petitioners to testify before the grand
    jury.    In light of the apparent inconsistencies between their
    use-of-force reports and the videotape, the petitioners each
    asserted his privilege against self-incrimination under the
    Fifth Amendment to the United States Constitution and art. 12 of
    the Massachusetts Declaration of Rights.    The district attorney
    then sought and obtained orders of immunity pursuant to
    G. L. c. 233, §§ 20C-20G, from a Superior Court judge.    The
    judge found that each petitioner "did validly refuse to answer
    questions or produce evidence on the grounds that such testimony
    or such evidence might tend to incriminate him."    The immunity
    orders provided that the petitioners
    "be granted immunity from prosecution, and not be
    subjected to any penalty or forfeiture with respect to
    the transaction, matter or thing concerning which he
    is compelled to testify or produce evidence, and no
    testimony concerning said crimes shall be used as
    evidence against the witness in any Court of the
    Commonwealth, except in a prosecution for perjury or
    6 Following the return of indictments against Pessoa, the
    district attorney entered a nolle prosequi on the charges
    against the February 2019 arrestee.
    6
    contempt committed while giving testimony or producing
    evidence under compulsion of this order."
    The grant of immunity compelled the petitioners to "give
    testimony and produce evidence" before a "jury in these
    proceedings."   During interviews prior to their grand jury
    testimony and during their grand jury testimony, the petitioners
    admitted that their use-of-force reports were false.
    On August 13, 2019, the district attorney's office filed
    two motions in the Superior Court.    A Superior Court judge
    ordered both motions impounded, and they were not served on the
    petitioners.    In the first motion, the district attorney sought
    authority to disclose information from a petitioner's grand jury
    testimony to defense counsel for criminal defendants in cases
    unrelated to the prosecution of Pessoa where the petitioner was
    "a potential witness," asserting that it was obligated to make
    such disclosures under Brady v. Maryland, 
    373 U.S. 83
    , 87-88
    (1963) and Giglio v. United States, 
    405 U.S. 150
    , 155 (1972)
    (Brady disclosure motion).    Attached to the motion was a
    proposed discovery letter that identified the relevant
    petitioners and stated that each is a police officer with the
    Fall River police department who "has been given a grant of
    immunity as part of the Pessoa grand jury investigation," and
    7
    who "admitted to filing a false police report" as part of that
    case.7
    In the second motion, the district attorney sought an order
    authorizing the disclosure of information concerning the
    petitioners' grand jury testimony to their municipal employer,
    the Fall River police department (employer disclosure motion).
    Attached to the employer disclosure motion was a proposed letter
    to the Fall River police chief, setting forth the same
    statements in the proposed Brady disclosure letter.
    On or about August 16, 2019, counsel for the petitioners
    learned that the district attorney's office had filed an
    7   The proposed discovery letter stated in relevant part:
    "Please be advised of the following potentially exculpatory
    discovery from an unrelated criminal proceeding:
    "1. Michael Pessoa, a Fall River police officer, was
    indicted on June 27, 2019 with a 15-count indictment, numbered
    1973CR00182. The indictment includes allegations that he beat
    arrestees and that he filed false police reports.
    "2. [PETITIONER 1], a Fall River police officer, has been
    given a grant of immunity as part of the Pessoa grand jury
    investigation. [PETITIONER 1] admitted to filing a false police
    report.
    "3. [PETITIONER 2], a Fall River police officer, has been
    given a grant of immunity as part of the Pessoa grand jury
    investigation. [PETITIONER 2] admitted to filing a false police
    report.
    ". . .
    "This disclosure is not for public dissemination."
    8
    internal affairs complaint against the petitioners with the Fall
    River police department, and learned of the employer disclosure
    motion.   Shortly thereafter, the petitioners filed a motion in
    the Superior Court seeking standing to oppose the employer
    disclosure motion.   Petitioners subsequently learned of, and
    sought to object to, the Brady disclosure motion.
    The Superior Court judge allowed the petitioners to oppose
    both motions.8   After oral argument, the judge allowed the
    district attorney's motion to make the Brady disclosure but
    denied the employer disclosure motion.     In allowing the Brady
    disclosure motion, the judge concluded that the proposed
    discovery letter "is potentially exculpatory evidence as it may
    tend to negate the guilt of criminal defendants against whom the
    officers may be witnesses at trial."     The judge ordered the
    Commonwealth to "notify by means of the proposed discovery
    letter, all defendants of cases not yet tried and cases now
    disposed that were tried after the date of the filing of the
    false police reports, for which the identified officer either
    prepared a report or is expected to be a witness at trial."
    In denying the employer disclosure motion, the judge
    concluded that the Commonwealth had not "shown that the need for
    8 The judge also ordered impounded all filings related to
    the two motions, as well as the recording of the argument on the
    motions.
    9
    disclosure outweigh[ed] the need for continued secrecy."   The
    judge noted:
    "It is apparent from the public nature of the
    indictments against Michael Pessoa, the public
    statements of the Fall River [p]olice [c]hief, and the
    media coverage on the topic, that the department has
    substantial information on which to commence
    disciplinary proceedings, and that the proposed
    statement the Commonwealth seeks to disclose to the
    department will provide no additional material
    information."
    The petitioners sought and were granted a stay with respect
    to the allowance of the Brady disclosure motion, enabling them
    to seek relief from a single justice of this court pursuant to
    G. L. c. 211, § 3.   The Commonwealth did not petition for relief
    from the denial of the employer disclosure motion.   After a
    hearing, the single justice reserved and reported the case to
    the full court.   The single justice directed the parties to
    address the following questions:   (1) whether there is a Brady
    obligation in these circumstances to disclose information to
    unrelated defendants; (2) whether, if there is a Brady
    obligation, the Commonwealth may disclose the information even
    if it was obtained as a result of a judicial order of immunity
    or in the course of the petitioners' grand jury testimony; (3)
    whether, if there is a Brady obligation, the Commonwealth must
    seek prior judicial approval for disclosure; (4) whether the
    process by which the Commonwealth obtained the petitioners'
    testimony precludes disclosing information to the petitioners'
    10
    municipal employer -- the police department -- concerning the
    petitioners' invocation of the right against self-incrimination,
    grant of immunity, and admitted conduct, for purposes of
    administrative disciplinary proceedings, employee training, or
    otherwise; and (5) whether, if disclosure to the police
    department is permissible, the Commonwealth must seek prior
    judicial approval.
    Discussion.      1.   Disclosure of Brady information to other
    defendants.   Under the due process clause of the Fourteenth
    Amendment to the United States Constitution and art. 12 of the
    Massachusetts Declaration of Rights, a prosecutor must disclose
    exculpatory information to a defendant that is material either
    to guilt or punishment.     See 
    Brady, 373 U.S. at 87
    ; Committee
    for Pub. Counsel Servs. v. Attorney Gen., 
    480 Mass. 700
    , 731
    (2018) (CPCS).   "When the 'reliability of a given witness may
    well be determinative of guilt or innocence,' nondisclosure of
    evidence affecting credibility falls within this general rule."
    
    Giglio, 405 U.S. at 154
    , quoting Napue v. Illinois, 
    360 U.S. 264
    , 269 (1959).     See Commonwealth v. Hill, 
    432 Mass. 704
    , 715
    (2000), quoting Commonwealth v. Collins, 
    386 Mass. 1
    , 8 (1982)
    ("Evidence tending to impeach the credibility of a key
    prosecution witness is clearly exculpatory").     Therefore, in the
    parlance of the criminal justice bar, Giglio information is
    Brady information:     "[t]he Brady obligation comprehends evidence
    11
    which provides some significant aid to the defendant's case,
    whether it furnishes corroboration of the defendant's story,
    calls into question a material, although not indispensable,
    element of the prosecution's version of the events, or
    challenges the credibility of a key prosecution witness."
    Commonwealth v. Ellison, 
    376 Mass. 1
    , 22 (1978).
    Apart from the constitutional obligations of disclosure,
    our rules of criminal procedure require a prosecutor, as part of
    automatic discovery, to disclose to a defendant "[a]ny facts of
    an exculpatory nature."9   Mass. R. Crim. P. 14 (a) (1) (A) (iii),
    as amended, 
    444 Mass. 1501
    (2005).   And our rules of
    professional conduct require prosecutors to "make timely
    disclosure to the defense of all evidence or information known
    to the prosecutor that tends to negate the guilt of the accused
    9 In Committee for Pub. Counsel Servs. v. Attorney Gen.
    (CPCS), we noted that while Mass. R. Crim. P. 14 "envisions a
    broad disclosure requirement for exculpatory facts, the rule
    explicitly identifies only a few specific categories of
    potentially exculpatory information that a prosecutor must
    disclose." CPCS, 
    480 Mass. 700
    , 732 (2018), citing Mass. R.
    Crim. P. 14 (a) (1) (A) (i), (viii), (ix) ("Commonwealth must
    disclose defendant's statements, 'promises, rewards or
    inducements' given to prosecution witnesses, and statements made
    during and about identification procedures"). To provide more
    detailed guidance to prosecutors, we asked the Supreme Judicial
    Court's standing advisory committee on the rules of criminal
    procedure "to draft a proposed Brady checklist to clarify the
    definition of exculpatory evidence" and establish "a more
    thorough baseline of the most likely sources and types of
    exculpatory information for prosecutors to consider."
    Id. Rule 14 has
    not yet been amended to include a Brady checklist.
    12
    or mitigates the offense."   Mass. R. Prof. C. 3.8 (d), as
    appearing in 
    473 Mass. 1301
    (2016).    See also Mass. R. Prof. C.
    3.4 (a), as appearing in 
    471 Mass. 1425
    (2015) (lawyer
    prohibited from concealing evidence or unlawfully obstructing
    another party's access to evidence); Mass. R. Prof. C. 3.8 (g)
    (prosecutor may not avoid pursuit of evidence that may aid
    accused); Mass. R. Prof. C. 3.8 (i) (prosecutor's obligation to
    disclose postconviction exculpatory evidence).
    The petitioners, in essence, make four arguments in support
    of their position that the district attorney should be barred
    from making the requested disclosure to criminal defendants in
    cases where a petitioner either prepared a report or is expected
    to be a witness at trial:    (1) that the information falls
    outside the scope of a prosecutor's Brady obligation; (2) that
    the information would not be admissible at trial and therefore
    is not exculpatory; (3) that disclosure would violate each
    petitioner's immunity order; and (4) that disclosure is barred
    by the rules governing grand jury secrecy.    We address each
    argument in turn.
    a.   Scope of a prosecutor's Brady obligation.    The
    petitioners contend that the information the district attorney
    seeks to disclose is not Brady information because the failure
    to disclose this information would not require a new trial if
    the defendant were to be convicted.    This argument incorrectly
    13
    equates a prosecutor's duty to disclose exculpatory evidence
    with the standard applied in determining whether the
    prosecutor's failure to disclose exculpatory evidence is so
    prejudicial that it requires a new trial.
    Under Federal constitutional law, a prosecutor's failure to
    disclose exculpatory information is not a breach of a
    prosecutor's constitutional duty to disclose unless the
    "omission is of sufficient significance to result in the denial
    of the defendant's right to a fair trial."     United States v.
    Bagley, 
    473 U.S. 667
    , 676 (1985), quoting United States v.
    Agurs, 
    427 U.S. 97
    , 108 (1976).   Under the standard of
    materiality applied by the Supreme Court, "[t]he evidence is
    material only if there is a reasonable probability that, had the
    evidence been disclosed to the defense, the result of the
    proceeding would have been different."    Bagley, supra at 682.
    "A 'reasonable probability' is a probability sufficient to
    undermine confidence in the outcome."
    Id. This materiality standard
    applies regardless of whether the undisclosed
    information was requested by the defendant, either generally or
    specifically.   See
    id. at 682-83.
    This court declined to adopt the Bagley "one size fits all"
    test as a matter of State constitutional law and instead
    "adhered to the Agurs test for determining the consequences of a
    prosecution's failure to comply with a specific request for
    14
    exculpatory evidence," which was the test the Supreme Court had
    supplanted in Bagley.   Commonwealth v. Tucceri, 
    412 Mass. 401
    ,
    406 (1992), citing Commonwealth v. Gallarelli, 
    399 Mass. 17
    , 21
    n.5 (1987).   Consequently, under our Declaration of Rights,
    where the defendant had made a specific request for the
    information, "a new trial would be required if the undisclosed
    evidence 'might have affected the outcome of the trial.'"
    
    Tucceri, supra
    at 405, quoting 
    Agurs, 427 U.S. at 104
    .     Where
    there was no request for the information, or only a general
    request was made, "a new trial would be required only if the
    undisclosed evidence 'create[d] a reasonable doubt which did not
    otherwise exist.'"   
    Tucceri, supra
    , quoting 
    Agurs, supra
    at 112.
    The petitioners contend that a prosecutor should not
    disclose exculpatory information unless the prosecutor has a
    constitutional duty to disclose, and that duty is triggered only
    where the information would create a reasonable doubt which
    would not otherwise exist.   See 
    Tucceri, 412 Mass. at 405
    .    This
    argument fails for two reasons.
    First, prosecutors have more than a constitutional duty to
    disclose exculpatory information; they also have a broad duty
    under Mass. R. Crim. P. 14 (a)(1)(iii) to disclose "[a]ny facts
    of an exculpatory nature."   This duty is not limited to
    information so important that its disclosure would create a
    reasonable doubt that otherwise would not exist; it includes all
    15
    information that would "tend to" indicate that the defendant
    might not be guilty or "tend to" show that a lesser conviction
    or sentence would be appropriate.   See 
    CPCS, 480 Mass. at 731
    ,
    quoting 
    Brady, 373 U.S. at 87
    (prosecutor may not withhold
    evidence that "would tend to exculpate [a defendant] or reduce
    the penalty"); 
    Collins, 470 Mass. at 267
    ("The Commonwealth is
    required to disclose exculpatory evidence to the defendant,
    including, as is relevant here, evidence that would tend to
    impeach the credibility of a key prosecution witness").
    Therefore, in Massachusetts, when we speak of a prosecutor's
    Brady obligation, we mean not only the constitutional obligation
    to disclose exculpatory information but also the broad
    obligation under our rules to disclose any facts that would tend
    to exculpate the defendant or tend to diminish his or her
    culpability.
    Second, even if prosecutors had only their constitutional
    obligation to disclose, and not the broad duty under our rules,
    we would not want prosecutors to withhold exculpatory
    information if they thought they could do so without crossing
    the line into a violation of the defendant's right to a fair
    trial.   It is true that the constitutional duty of a prosecutor
    to disclose derives from the defendant's due process right to a
    fair trial.    See 
    Agurs, 427 U.S. at 108
    ("unless the omission
    deprived the defendant of a fair trial, there was no
    16
    constitutional violation requiring that the verdict be set
    aside; and absent a constitutional violation, there was no
    breach of the prosecutor's constitutional duty to disclose").
    Therefore, a finding regarding a breach of that obligation looks
    backward in time, at whether the failure to disclose deprived
    the defendant of a fair trial.   But a prosecutor who is deciding
    whether to disclose exculpatory information must look forward in
    time, to a trial that has yet to occur, where even an
    experienced prosecutor may be unsure about the defenses that the
    defendant will offer or that will emerge from the evidence.     As
    the Supreme Court declared in 
    Agurs, supra
    :
    "[T]here is a significant practical difference between the
    pretrial decision of the prosecutor and the post-trial
    decision of the judge. Because we are dealing with an
    inevitably imprecise standard, and because the significance
    of an item of evidence can seldom be predicted accurately
    until the entire record is complete, the prudent prosecutor
    will resolve doubtful questions in favor of disclosure."
    See Kyles v. Whitley, 
    514 U.S. 419
    , 439 (1995) ("a prosecutor
    anxious about tacking too close to the wind will disclose a
    favorable piece of evidence. . . . This is as it should be"
    [citation omitted]).
    A prosecutor should not attempt to determine how much
    exculpatory information can be withheld without violating a
    defendant's right to a fair trial.   Rather, once the information
    is determined to be exculpatory, it should be disclosed --
    period.   And where a prosecutor is uncertain whether information
    17
    is exculpatory, the prosecutor should err on the side of caution
    and disclose it.   See Commonwealth v. St. Germain, 
    381 Mass. 256
    , 262 n.10 (1980), quoting Commentary to A.B.A. Standards for
    Criminal Justice, Standards Relating to Discovery and Procedure
    Before Trial 2.1(d) (Approved Draft 1970) ("We reiterate[] that
    'prosecuting attorneys [should] become accustomed to disclosing
    all material which is even possibly exculpatory, as a
    prophylactic against reversible error and in order to save court
    time arguing about it'").10
    b.   Consequence of admissibility of impeachment information
    on Brady obligation.   The petitioners also argue that
    prosecutors have no obligation to disclose the petitioners'
    false statements because their prior misconduct would not be
    admissible in evidence at trial in any unrelated criminal case.
    We disagree.
    The petitioners are correct that, in the absence of a
    conviction, "[i]n general, specific instances of misconduct
    showing the witness to be untruthful are not admissible for the
    purpose of attacking or supporting the witness's credibility."
    10Where a prosecutor recognizes information to be
    exculpatory, but is unsure whether it should be disclosed, "due
    to a concern regarding privilege or work product, or for any
    other reason, the prosecutor must file a motion for a protective
    order and must present the information for a judge to review in
    camera." 
    CPCS, 480 Mass. at 733
    , citing Mass. R. Crim. P. 14
    (a) (6).
    18
    Mass. G. Evid. § 608(b) (2020), citing Commonwealth v. Bregoli,
    
    431 Mass. 265
    , 275 (2000), and Commonwealth v. LaVelle, 
    414 Mass. 146
    , 151 (1993).   See Mass. G. Evid. § 609(a) (2020) ("A
    party may seek to impeach the credibility of a witness by means
    of the court record of the witness's prior conviction or a
    certified copy").   But we have "chiseled a narrow exception" to
    this general rule, "recognizing that in special circumstances
    the interest of justice forbids strict application of the rule."
    
    LaVelle, supra
    , citing Commonwealth v. Bohannon, 
    376 Mass. 90
    ,
    94 (1978), S.C., 
    385 Mass. 733
    (1982).11
    In 
    Bohannon, 376 Mass. at 94
    , we declared, "[w]hen evidence
    concerning a critical issue is excluded and when that evidence
    might have had a significant impact on the result of the trial,
    the right to present a full defense has been denied."   In that
    case, a critical issue at trial was the credibility of the
    complainant, who testified that she did not consent to sexual
    intercourse with the defendant, and the evidence that might have
    11In Commonwealth v. Almonte, 
    465 Mass. 224
    , 241 (2013), we
    noted that "under the Fed. R. Evid. 608(b), a party on cross-
    examination of a witness may inquire into the details of prior
    instances of misconduct if probative of the witness's character
    for veracity." Because the benefit to the defendant in that
    case "of an expanded evidentiary rule concerning impeachment on
    the issue of veracity would be marginal at best," we left "to
    another day the question whether we should follow the guide of
    the Fed. R. Evid. 608(b), and adopt such a rule more generally."
    Id. at
    242. 
    This is not the day, or the case, where we need to
    address that question.
    19
    had a significant impact on the result of the trial were
    hospital records that revealed that "the complainant had made a
    number of unsubstantiated, and apparently false, accusations of
    rape."
    Id. at
    93.   We concluded that it was reversible error
    for the judge to have prevented the defendant from impeaching
    the victim-witness with this evidence of prior false
    accusations.   See
    id. at 95.
    A judge has the discretion to decide whether the
    credibility of a police officer is a critical issue at trial and
    whether the officer's prior false statements in a separate
    matter might have a significant impact on the result of the
    trial, such that the prior misconduct should be admitted in the
    interest of justice.    See Commonwealth v. Lopes, 
    478 Mass. 593
    ,
    606 (2018).    In Lopes, we concluded that the judge did not abuse
    his discretion by preventing the defendant from impeaching a
    police officer who was one of the Commonwealth's key
    eyewitnesses in a homicide case "with information that the
    Boston police department had suspended [the police officer] five
    years earlier for, among other things, lying in an internal
    affairs investigation on a personal matter."
    Id. We noted that
    the alleged conduct was "not material" to the homicide
    investigation where it took place five years before the murder,
    "did not result in a criminal conviction or even a criminal
    20
    charge," and was "not related to how [the officer] conducted
    police investigations."
    Id. Our delineation of
    these factors suggests that a judge, in
    deciding whether to allow a police officer witness in the
    interest of justice to be impeached with prior misconduct, may
    consider the age of the prior misconduct, the strength of the
    evidence of the prior misconduct and the simplicity of
    establishing it, and whether the prior misconduct is probative
    of how the officer conducts police investigations.12   As to the
    age of the misconduct, if it happened so long ago that it would
    not be admissible for impeachment had it resulted in a criminal
    conviction, see Mass. G. Evid. § 609, it would not likely be
    admissible in the absence of a conviction.   As to the strength
    of the evidence of the prior misconduct and the simplicity of
    establishing it, a judge may consider whether admitting evidence
    of the misconduct will result in a trial within a trial to
    resolve whether it happened or how it happened.   As to whether
    the prior misconduct is probative of how the officer conducts
    police investigations, a judge may consider whether the
    misconduct reflects a willingness to lie to win a conviction or
    12We also note that our conclusion in Commonwealth v.
    Lopes, 
    478 Mass. 593
    , 606 (2018), that the judge did not abuse
    his discretion in barring such impeachment, does not mean that
    it would have been an abuse of discretion for the judge to have
    admitted such evidence.
    21
    instead involves matters that, although serious, do not bear on
    the integrity of police investigations, such as taking
    unauthorized sick time or inflating overtime hours.     Concealing
    police brutality against an arrestee, whether by the officer or
    a fellow officer, or making false statements that might lead to
    an unjust conviction are for law enforcement officers the
    equivalent of high crimes and misdemeanors in this regard.     All
    of these factors suggest that the petitioners' prior false
    statements might be admissible in a case where the credibility
    of their testimony is a critical issue.
    We do not conclude that the exculpatory information at
    issue will always be or could never be admissible as impeachment
    evidence in an unrelated criminal case where one of the
    petitioners is a witness.     All we conclude is that the
    information should be disclosed to unrelated defendants so that
    the trial judge may rule on its admissibility if the defendant
    were to seek its admission.
    Moreover, the ultimate admissibility of the information is
    not determinative of the prosecutor's Brady obligation to
    disclose it.   Where the information, as here, demonstrates that
    a potential police witness lied to conceal a fellow officer's
    unlawful use of excessive force or lied about a defendant's
    conduct and thereby allowed a false or inflated criminal charge
    to be prosecuted, disclosing such information may cause defense
    22
    counsel, or his or her investigator, to probe more deeply into
    the prior statements and conduct of the officer to determine
    whether the officer might again have lied to conceal the
    misconduct of a fellow police officer or to fabricate or
    exaggerate the criminal conduct of the accused.
    c.   Consequence of order of immunity on Brady obligation.
    The petitioners contend that, where exculpatory information is
    obtained from a witness's immunized testimony, prosecutors
    should not disclose the information to defendants in unrelated
    cases because the orders of immunity protect immunized witnesses
    from the adverse consequences that might result from such
    disclosure.   This argument misreads the scope of immunity
    provided by the immunity order.
    The Fifth Amendment states in relevant part:     "No person
    . . . shall be compelled in any criminal case to be a witness
    against himself."   Article 12 states in part:    "No subject shall
    be held to answer for any crimes or offense, until the same is
    fully and plainly, substantially and formally, described to him;
    or be compelled to accuse, or furnish evidence against himself."
    As is apparent from the language of the Fifth Amendment and art.
    12, a witness's right to refuse to testify before a tribunal by
    invoking the privilege against self-incrimination is available
    only where the witness's testimony might incriminate the witness
    with respect to a crime, either by the testimony itself or by
    23
    evidence derived from that testimony.    See Commonwealth v.
    Martin, 
    423 Mass. 496
    , 502 (1996), quoting Commonwealth v.
    Funches, 
    379 Mass. 283
    , 289 (1979) ("The privilege afforded not
    only extends to answers that would in themselves support a
    conviction . . . but likewise embraces those which would furnish
    a link in the chain of evidence needed to prosecute").     A
    witness may not invoke the privilege simply because the
    testimony, when it becomes known, will cause the witness to be
    fired from a job or injure the witness's reputation in the
    community.   See Pixley v. Commonwealth, 
    453 Mass. 827
    , 832
    (2009), citing Martin, supra at 502-503 (circumstances for
    invoking privilege "must clearly indicate a possibility of self-
    incrimination").
    An immunity order is sometimes referred to as a compulsion
    order because it grants immunity to the witness that is
    "coextensive with the scope of the privilege against self-
    incrimination, and therefore is sufficient to compel testimony
    over a claim of the privilege."   Kastigar v. United States, 
    406 U.S. 441
    , 453 (1972).   Under the Fifth Amendment, testimony may
    be compelled through an order granting use immunity that
    prohibits only the use, in any criminal case, of compelled
    testimony and the use of any evidence directly or indirectly
    derived from that compelled testimony.   See
    id. at 453.
    However, under the Massachusetts Constitution and the governing
    24
    statutes, G. L. c. 233, §§ 20C-20G, testimony may be compelled
    only through an order granting transactional immunity that
    provides "absolute immunity from subsequent prosecution based
    upon any transaction, matter, or occurrence about which an
    immunized witness testified or produced evidence."   Attorney
    Gen. v. Colleton, 
    387 Mass. 790
    , 795 (1982).   See Commonwealth
    v. Austin A., 
    450 Mass. 665
    , 668 (2008).   The scope of
    transactional immunity is set forth in G. L. c. 233, § 20G:
    "A witness who has been granted immunity as provided
    in section 20E shall not be prosecuted or subjected to
    any penalty or forfeiture for or on account of any
    transaction matter, or thing concerning which he is so
    compelled, after having claimed his privilege against
    self-incrimination, to testify or produce evidence,
    nor shall testimony so compelled be used as evidence
    in any criminal or civil proceeding against him in any
    court of the commonwealth, except in a prosecution for
    perjury or contempt committed while giving testimony
    or producing evidence under compulsion, pursuant to
    section 20C or 20E" (emphasis added).13
    "[I]t would be difficult to imagine an immunity more complete."
    Matter of a John Doe Grand Jury Investigation, 
    405 Mass. 125
    ,
    130 (1989), quoting Cabot v. Corcoran, 
    332 Mass. 44
    , 51 (1954).
    13 The immunity orders in this case similarly stated that
    the petitioners "be granted immunity from prosecution, and not
    be subjected to any penalty or forfeiture with respect to the
    transaction, matter or thing concerning which he is compelled to
    testify or produce evidence against the witness in any Court of
    the Commonwealth, except in a prosecution for perjury or
    contempt committed while giving testimony or producing evidence
    under compulsion of this order."
    25
    Under § 20G, a witness with immunity may not be criminally
    prosecuted for any transaction about which the witness is
    compelled to testify.   Nor may the Commonwealth seek any civil
    penalty or forfeiture regarding such a transaction.   And apart
    from the prohibition against criminal and civil prosecution
    regarding matters raised during compelled testimony, the
    testimony itself may not be "used as evidence in any criminal or
    civil proceeding against" the witness in a court of law, except
    where the immunized testimony itself is the subject of a
    prosecution against the witness for perjury or contempt of
    court.   See G. L. c. 233, § 20G.
    If an immunized witness testifies at trial, however, the
    testimony is as public as the trial itself, and nothing in the
    order of immunity protects the witness from other adverse
    consequences that may arise from the content of the witness's
    testimony.   If the witness, in the course of providing immunized
    testimony, admits that he lied, cheated, or killed, the witness
    may not be prosecuted for that illegal conduct, criminally or
    civilly; but nothing in the immunity statute or order protects
    the witness from being fired by his employer or shunned by his
    community because of the misconduct he revealed.   And with
    respect to all persons other than the witness, immunized
    testimony is no different from any other testimony, except that
    it was compelled.
    26
    The petitioners argue that the disclosure of their
    testimony would "penalize them for invoking their privilege
    against self-incrimination" in violation of their orders of
    immunity and the statute.    But disclosure is not the penalty
    from which they are protected by the immunity orders; the
    petitioners were granted immunity from prosecution, not from
    publication or disclosure.   Therefore, the fact that testimony
    was compelled is irrelevant to the prosecutor's Brady obligation
    to provide exculpatory information.    An immunized witness, like
    others who are not immunized, may prefer that the testimony not
    be disseminated by the prosecutor, especially if it would reveal
    the witness's dirty deeds, but that preference does not affect
    whether the information is exculpatory or whether it should be
    furnished to other defendants.   Once disclosed, the immunized
    testimony may be used to impeach the immunized witness, provided
    that the testimony is not being used against the witness in a
    criminal or civil prosecution other than for perjury.    In sum, a
    prosecutor's obligation to disclose exculpatory information is
    the same for immunized testimony as for all other testimony.
    There is no higher Brady standard applied for a prosecutor to
    disclose immunized testimony.
    d.   Consequence of grand jury secrecy on Brady obligation.
    Finally, the petitioners argue that, "[g]iven that Brady does
    not compel the disclosure of the information, the Commonwealth
    27
    should not be permitted to disclose it in light of the rule that
    grand jury proceedings are to remain secret."    As 
    discussed supra
    , the premise of this argument is incorrect -- a prosecutor
    is required to disclose the information at issue to unrelated
    defendants pursuant to the obligation to disclose exculpatory
    information.   The petitioners, however, present an alternative
    argument -- that the Commonwealth should be required to obtain
    judicial approval before making such a disclosure.    We address
    the alternative argument.14
    It is certainly true that "[t]he requirement that grand
    jury proceedings remain secret is deeply rooted in the common
    law of the Commonwealth."     Globe Newspaper Co. v. Police Comm'r
    of Boston, 
    419 Mass. 852
    , 865 (1995), quoting WBZ-TV4 v.
    District Attorney for the Suffolk Dist., 
    408 Mass. 595
    , 599
    (1990).   It is also true that "[s]ecrecy is of fundamental
    importance to grand jury proceedings."     Commonwealth v. Holley,
    
    476 Mass. 114
    , 118 (2016).
    "[S]everal interests are served by maintaining strict
    confidentiality, 'such as protection of the grand jury
    from outside influence, including influence by the
    news media; protection of individuals from notoriety
    and disgrace; encouragement of free disclosure of
    information to the grand jury; protection of witnesses
    14After the immunity order issued, the petitioners agreed
    to be interviewed by the prosecutor prior to their grand jury
    appearance. In view of the conclusions we draw, we need not
    address whether these interviews are protected by the rules
    governing grand jury secrecy.
    28
    from intimidation; and enhancement of free grand jury
    deliberations.'"
    Globe Newspaper Co., supra at 865-866, quoting Matter of a John
    Doe Grand Jury Investigation, 
    415 Mass. 727
    , 729 (1993).
    Under Mass. R. Crim. P. 5 (d), as appearing in 
    442 Mass. 1505
    (2004), "[a] person performing an official function in
    relation to the grand jury may not disclose matters occurring
    before the grand jury except in the performance of his or her
    official duties or when specifically directed to do so by the
    court."   A prosecutor presenting evidence at a grand jury is
    certainly "performing an official function in relation to the
    grand jury," so the issue presented is whether the disclosure of
    exculpatory evidence to defense counsel is within the scope of
    the "the performance of his or her official duties."
    There can be no doubt that the use of inculpatory grand
    jury testimony to prosecute a defendant in a criminal case is
    within the scope of the performance of a prosecutor's official
    duties.   The disclosure of exculpatory grand jury testimony to
    defense counsel is equally within the scope of the performance
    of a prosecutor's official duties.   For a prosecutor, disclosure
    of information that may permit a defendant to prove his or her
    innocence should be equally as important as securing the
    conviction of a guilty party:
    "The [prosecutor] is the representative not of an ordinary
    party to a controversy, but of a sovereignty whose
    29
    obligation to govern impartially is as compelling as its
    obligation to govern at all; and whose interest, therefore,
    in a criminal prosecution is not that it shall win a case,
    but that justice shall be done. As such, he [or she] is in
    a peculiar and very definite sense the servant of the law,
    the twofold aim of which is that guilt shall not escape or
    innocence suffer."
    Berger v. United States, 
    295 U.S. 78
    , 88 (1935).     See Jackson,
    The Federal Prosecutor, reprinted in 24 J. Am. Jud. Soc'y 18, 20
    (1940) ("A sensitiveness to fair play and sportsmanship is
    perhaps the best protection against the abuse of power, and the
    citizen's safety lies in the prosecutor who tempers zeal with
    human kindness, who seeks truth and not victims, who serves the
    law and not factional purposes, and who approaches his [or her]
    task with humility").15
    We therefore conclude that the disclosure to defense
    counsel of exculpatory information arising from a grand jury
    proceeding is as much a part of a prosecutor's official duty as
    the presentation of inculpatory evidence at trial.    Because the
    disclosure of exculpatory grand jury information is within the
    performance of a prosecutor's official duties under rule 5 (d),
    it may be disclosed without an order of a court.     A judge would
    have to review the disclosure to defense counsel only if the
    15United States Attorney General Robert H. Jackson
    delivered this address at the Second Annual Conference of United
    States Attorneys in Washington, D.C., on April 1, 1940. See
    Jackson, The Federal Prosecutor, reprinted in 24 J. Am. Jud.
    Soc'y 18, 18 (1940).
    30
    prosecutor sought a protective order limiting further
    dissemination of the information.
    Consequently, as to the first three issues identified by
    the single justice, we conclude, as did the district attorney,
    that the prosecutors here have a Brady obligation to disclose
    the exculpatory information at issue to unrelated criminal
    defendants in cases where a petitioner is a potential witness or
    prepared a report in the criminal investigation.   That
    obligation remains even though that information was obtained in
    grand jury testimony compelled by an immunity order.    And the
    district attorney may fulfill that obligation without prior
    judicial approval; a judge's order is needed only for issuance
    of a protective order limiting the dissemination of grand jury
    information.
    More broadly, we conclude that where a prosecutor
    determines from information in his or her possession that a
    police officer lied to conceal the unlawful use of excessive
    force, whether by him- or herself or another officer, or lied
    about a defendant's conduct and thereby allowed a false or
    inflated criminal charge to be prosecuted, the prosecutor's
    obligation to disclose exculpatory information requires that the
    information be disclosed to defense counsel in any criminal case
    where the officer is a potential witness or prepared a report in
    the criminal investigation.
    31
    We note that the United States Department of Justice,
    through its "Policy Regarding the Disclosure to Prosecutors of
    Potential Impeachment Information Concerning Law Enforcement
    Agency Witnesses," known as its "Giglio Policy," has established
    a procedure whereby Federal prosecutors obtain potential
    impeachment information from Federal investigative agencies,
    such as the Federal Bureau of Investigation, regarding law
    enforcement agents and employees who may be witnesses in the
    cases they prosecute.   United States Department of Justice,
    Justice Manual, Tit. 9-5.100 (updated Jan. 2020) (Manual),
    https://www.justice.gov/jm/jm-9-5000-issues-related-trials-and-
    other-court-proceedings [https://perma.cc/NKL2-YZ2J].     According
    to the policy:
    "Prosecutors should have a candid conversation with
    each potential investigative agency witness and/or
    affiant with whom they work regarding any on-duty or
    off-duty potential impeachment information, including
    information that may be known to the public but that
    should not in fact be the basis for impeachment in a
    federal criminal court proceeding, so that prosecuting
    attorneys can take appropriate action, be it producing
    the material or taking steps to preclude its improper
    introduction into evidence."
    Id. at
    Tit. 9-5.100(1).   In addition, each United States
    Attorney's office designates a "requesting official" who may ask
    an investigative agency's official to provide potential
    impeachment information regarding an agency employee associated
    with the case or matter being prosecuted.
    Id. at
    Tit. 9-
    32
    5.100(2)-(4).   When a case is initiated within the United States
    Attorney's office, the prosecutor responsible for the case, to
    supplement the information obtained directly from the agency
    employees involved in the case, may ask the office's requesting
    official to obtain from the agency's designated official any
    potential impeachment information regarding those agency
    employees.
    Id. at
    Tit. 9-5.00(4).   Potential impeachment
    information may include, but is not limited to:
    "i) any finding of misconduct that reflects upon the
    truthfulness or possible bias of the employee,
    including a finding of lack of candor during a
    criminal, civil, or administrative inquiry or
    proceeding;
    "ii) any past or pending criminal charge brought
    against the employee;
    "iii) any allegation of misconduct bearing upon
    truthfulness, bias, or integrity that is the subject
    of a pending investigation;
    "iv) prior findings by a judge that an agency employee
    has testified untruthfully, made a knowing false
    statement in writing, engaged in an unlawful search or
    seizure, illegally obtained a confession, or engaged
    in other misconduct;
    "v) any misconduct finding or pending misconduct
    allegation that either casts a substantial doubt upon
    the accuracy of any evidence -- including witness
    testimony -- that the prosecutor intends to rely on to
    prove an element of any crime charged, or that might
    have a significant bearing on the admissibility of
    prosecution evidence . . . ;
    "vi) information that may be used to suggest that the
    agency employee is biased for or against a
    defendant . . . ; and
    33
    "vii) information that reflects that the agency
    employee's ability to perceive and recall truth is
    impaired."
    Id. at
    Tit. 9-5.100(c)(5).
    This policy is not intended to grant any rights to
    defendants and does not have the force of law.
    Id. at
    Tit. 9-
    5.100 (preface).   But it reflects the department's recognition
    of the need for prosecutors to learn of potential impeachment
    information regarding all the investigating agents and employees
    participating in the cases they prosecute, so that they may
    consider whether the information should be disclosed to defense
    counsel under the Brady and Giglio line of cases.   See
    id. We do not
    possess the authority to require the Attorney General and
    every district attorney in this Commonwealth to promulgate a
    comparable policy, but we strongly recommend that they do.16
    16WBUR radio recently reported that three of the eleven
    district attorneys in Massachusetts maintain some form of a list
    of police officers who were "flagged by prosecutors as either
    having engaged in or been accused of misconduct that the
    [district attorney's] office might legally need to disclose" to
    defense counsel because the information is relevant to the
    credibility of the officers. See WBUR News, "Few Mass. DAs Keep
    Police Watch Lists. Constitutional Questions Exist For Those
    Who Don't," Aug. 18, 2020, https://www.wbur.org/news
    /2020/08/18/police-brady-lists-middlesex-district-attorney
    [https://perma.cc/NE45-4444].
    In addition, we note that prosecutive offices in a number
    of other States have established policies or protocols governing
    the discovery and disclosure of potential exculpatory
    impeachment information regarding law enforcement witnesses.
    See, e.g., Memorandum of the New Jersey Attorney General,
    Disclosure of Exculpatory and Impeachment Evidence in Criminal
    34
    2.   Disclosure of false statements to police department.
    As earlier noted, the judge denied the district attorney's
    motion for an order authorizing the disclosure of information
    concerning the petitioners' grand jury testimony to the Fall
    River police department.   The judge concluded that the
    department already had substantial information to commence
    disciplinary proceedings and that the information the district
    attorney sought to disclose would provide the department with
    "no additional material information."   Although the district
    attorney does not challenge the judge's order, the single
    justice asked the parties to address in their briefs, in
    essence, whether disclosure to the police chief would have been
    permissible if the police department did not already know of the
    Cases, Brady and Giglio Practical Application, Investigative
    Employees and Potential Giglio Material (June 18, 2019), at 5,
    https://www.nj.gov/oag/dcj/policies.html [https://perma.cc/YP9W-
    LY2R ] (noting that "[i]t is imperative that investigative
    personnel assist with the prosecuting agency's legal duty to
    review and, if necessary, disclose evidence that may impact the
    credibility of potential investigative State witnesses," and
    providing examples of Giglio material); Memorandum of the New
    Hampshire Attorney General, The Exculpatory Evidence Protocol
    and Schedule (March 21, 2017), https://www.doj.nh.gov/criminal
    /documents/exculpatory-evidence-20170321.pdf [https://perma.cc
    /GU6X-HUK9 ] (creating protocol for an exculpatory evidence
    schedule); Washington Association of Prosecuting Attorneys,
    Model Policy, Disclosure of Potential Impeachment Evidence for
    Recurring Investigative or Professional Witnesses (June 19,
    2013), http://waprosecutors.org/manuals/ [https://perma.cc/RHE2-
    L3Q8] (model guidelines for creation and maintenance of
    potential impeachment evidence lists for law enforcement
    witnesses).
    35
    petitioners' false statements, and whether any such disclosure
    would require prior judicial approval.
    We generally are reluctant to address issues that are not
    the subject of a live dispute, or orders that have not been
    challenged by any of the parties, but we respect the single
    justice's implicit recognition that guidance on these matters is
    needed.   We therefore will provide guidance, albeit limited to
    the type of false statements at issue in this case.   In
    providing this guidance, we do not evaluate the merits of the
    judge's decision in the case.   Indeed, we address a factual
    circumstance quite different from that addressed by the judge --
    where the police chief, in the absence of the requested
    disclosure by the district attorney, would not know that
    immunized grand jury testimony revealed the misconduct of two
    police officers in the department.
    We have already 
    declared, supra
    , that where a prosecutor
    determines that a potential police witness lied to conceal a
    police officer's unlawful use of excessive force, or lied about
    a defendant's conduct and thereby allowed a false or inflated
    criminal charge to be prosecuted, the prosecutor's obligation to
    disclose exculpatory information requires that the information
    be disclosed to defense counsel in any case where the officer is
    a potential witness or prepared a report in the criminal
    investigation.   Where this disclosure must be made to defense
    36
    counsel, it must also be made to the police chief of the
    department because the consequence of such disclosure is to
    jeopardize or, at a minimum, complicate the successful
    prosecution of any criminal case where the police officer played
    a significant role.   It would make no sense for the prosecutor
    and defense counsel to possess this information, and for the
    police chief to be deprived of the same information.     The police
    chief needs this information to determine whether to fire or
    otherwise discipline the officer, place the officer on desk
    duty, or take other steps to ensure the integrity of the
    department and its criminal cases.   Because the disclosure of
    this information arises from the prosecutor's Brady obligation,
    no prior judicial approval is required to make this disclosure,
    even if it arises from immunized grand jury testimony.
    If, however, other police misconduct is revealed through a
    grand jury investigation that does not require the prosecutor
    under his or her Brady obligation to disclose the misconduct to
    defense counsel in any case where the officer is a potential
    witness or prepared a report in the criminal investigation,
    prior judicial approval should be obtained before this grand
    jury information may be revealed to the officer's police chief.
    See Mass. R. Crim. P. 6 (d).   See also Petition of Craig v.
    United States, 
    131 F.3d 99
    , 102-103 (2d Cir. 1997) (holding that
    Fed. R. Crim. P. 6 [e] [3] contains permissive, not exhaustive,
    37
    list of reasons for release of grand jury materials, and
    affirming nonexhaustive list of factors judges may consider when
    evaluating "special circumstances" motions to release grand jury
    materials).   In the absence of a live dispute, and the facts
    that would accompany such a dispute, we do not opine as to the
    circumstances when, if at all, such approval should be granted.
    Conclusion.    The case is remanded to the county court for
    entry of a judgment denying the petition under G. L. c. 211,
    § 3, thereby leaving intact the judge's order allowing the
    district attorney's motion to make the Brady disclosure.
    So ordered.