Bridgeman v. District Attorney for the Suffolk District ( 2015 )


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    SJC-11764
    KEVIN BRIDGEMAN & others1 vs. DISTRICT ATTORNEY FOR THE SUFFOLK
    DISTRICT & another.2
    Suffolk.    January 8, 2015. - May 18, 2015.
    Present:    Gants, C.J., Spina, Cordy, Botsford, Duffly, Lenk,
    & Hines, JJ.
    Controlled Substances. Constitutional Law, Plea, Conduct of
    government agents, Judicial review, Sentence, Delay in
    commencement of prosecution. Due Process of Law, Plea,
    Sentence, Delay in commencement of prosecution,
    Intervention in civil action. Committee for Public Counsel
    Services. Attorney at Law, Attorney as witness. Practice,
    Criminal, Plea, Postconviction relief, New trial, Sentence,
    Delay in commencement of prosecution, Conduct of government
    agents, Cross-examination by prosecutor. Evidence, Guilty
    plea, Certificate of drug analysis, Disclosure of evidence,
    Cross-examination. Supreme Judicial Court, Superintendence
    of inferior courts. Practice, Civil, Intervention.
    Civil action commenced in the Supreme Judicial Court for
    the county of Suffolk on January 9, 2014.
    The case was reported by Botsford, J.
    1
    Yasir Creach and Miguel Cuevas; Committee for Public
    Counsel Services (CPCS), intervener.
    2
    District Attorney for the Essex District. For the sake of
    simplicity, we refer to the district attorneys for the Suffolk
    and Essex Districts as "the Commonwealth."
    2
    Matthew R. Segal (Daniel N. Marx with him) for the
    petitioners.
    Benjamin H. Keehn, Committee for Public Counsel Services
    (Nancy J. Caplan, Committee for Public Counsel Services, with
    him) for the intervener.
    Vincent J. DeMore, Assistant District Attorney, for
    District Attorney for the Suffolk District.
    Quentin Weld, Assistant District Attorney, for District
    Attorney for the Essex District.
    Jean-Jacques Cabou, of Arizona; Joanna Perini-Abbott, of
    Oregon; & Daniel Gelb & Elizabeth A. Lunt, for National
    Association of Criminal Defense Lawyers & another, amici curiae,
    submitted a brief.
    Richard Marshall, of New York, & Aaron M. Katz, C. Thomas
    Brown, Mark Vaughn, & Barbara J. Dougan, for Families Against
    Mandatory Minimums & others, amici curiae, submitted a brief.
    SPINA, J.   The present case is the latest in a series of
    cases concerning the egregious misconduct of Annie Dookhan, a
    chemist who was employed in the forensic drug laboratory of the
    William A. Hinton State Laboratory Institute (Hinton drug lab)
    from 2003 until 2012.3   Kevin Bridgeman, Yasir Creach, and Miguel
    Cuevas (collectively, the petitioners) are three individuals who
    pleaded guilty to various drug offenses in cases where Dookhan
    signed the certificates of drug analysis (drug certificates) on
    the line labeled "Assistant Analyst."   On January 9, 2014, prior
    to this court's decision in Commonwealth v. Scott, 
    467 Mass. 336
    (2014), the petitioners filed a petition in the county court
    3
    The details of Annie Dookhan's misconduct in the forensic
    drug laboratory of the William A. Hinton State Laboratory
    Institute (Hinton drug lab) have been well documented and,
    therefore, will not be repeated in the present case. See, e.g.,
    Commonwealth v. Scott, 
    467 Mass. 336
    , 338-342 (2014).
    3
    pursuant to G. L. c. 211, § 3, asking the court for two forms of
    relief.   First, they asked for the establishment of a rule
    whereby defendants who have been convicted of drug offenses, and
    who successfully obtain new trials based on Dookhan's
    misconduct, cannot thereafter be charged with or convicted of
    more serious offenses than those of which the defendants
    originally were convicted, or be given longer sentences than
    originally were imposed.   Second, the petitioners requested an
    order requiring those district attorneys who prosecuted so-
    called "Dookhan defendants"4 to (1) notify all such defendants
    within ninety days whether the Commonwealth intends to
    reprosecute them;5 (2) vacate the convictions in those cases
    where the defendants are not so notified; and (3) conclude any
    reprosecutions within six months.   On May 27, 2014, following
    the release of our decision in Scott, supra,6 the Committee for
    4
    We use the term "Dookhan defendants" to refer generally to
    those individuals who were convicted of drug offenses and in
    whose cases Dookhan signed the certificate of drug analysis
    (drug certificate) on the line labeled "Assistant Analyst."
    These cases all arose in Barnstable, Bristol, Dukes, Essex,
    Middlesex, Norfolk, Plymouth, and Suffolk Counties, except for
    one case that arose in Worcester County.
    5
    As noted by the single justice, the petitioners appear to
    propose notification to all Dookhan defendants, irrespective of
    whether they have sought and obtained postconviction relief.
    6
    Relying on Ferrara v. United States, 
    456 F.3d 278
    , 290
    (1st Cir. 2006), this court articulated in 
    Scott, 467 Mass. at 346-358
    , a two-prong framework for analyzing a defendant's
    motion to withdraw a guilty plea under Mass. R. Crim. P. 30 (b),
    4
    Public Counsel Services (CPCS) filed a motion to intervene under
    Mass. R. Civ. P. 24 (a), 
    365 Mass. 769
    (1974), to join the
    petitioners' requests for relief and to seek additional relief
    for all Dookhan defendants.7   The Commonwealth opposed both the
    petition for relief pursuant to G. L. c. 211, § 3, and the
    motion to intervene.   After several hearings, a single justice
    as appearing in 
    435 Mass. 1501
    (2001), in a case involving the
    misconduct of Dookhan at the Hinton drug lab. Under the first
    prong of the analysis, a defendant must show egregious
    misconduct by the government that preceded the entry of the
    defendant's guilty plea and that occurred in the defendant's
    case. Scott, supra at 347-354. We recognized that, given the
    breadth and duration of Dookhan's malfeasance, it might be
    impossible for a defendant to show the required nexus between
    government misconduct and the defendant's own case. 
    Id. at 351-
    352. Consequently, we established a special evidentiary rule
    whereby a defendant seeking to vacate a guilty plea under rule
    30 (b) as a result of the revelation of Dookhan's misconduct,
    and proffering a drug certificate from the defendant's case
    signed by Dookhan on the line labeled "Assistant Analyst," would
    be entitled to "a conclusive presumption that egregious
    government misconduct occurred in the defendant's case." 
    Id. at 352.
    Application of this conclusive presumption in a particular
    case meant that a defendant's evidentiary burden to establish
    each element of the first prong of the Ferrara-Scott framework
    was satisfied. 
    Id. at 353-354.
    The defendant then had the
    burden under the second prong of the analysis of particularizing
    Dookhan's misconduct to his or her decision to tender a guilty
    plea. 
    Id. at 354.
    That is to say, the defendant had to
    "demonstrate a reasonable probability that he [or she] would not
    have pleaded guilty had he [or she] known of Dookhan's
    misconduct." 
    Id. at 355.
    A successful showing on this second
    prong of the Ferrara-Scott framework would warrant an order
    granting the defendant's motion to withdraw his guilty plea.
    7
    CPCS does not represent any of the petitioners. It seeks
    intervention to assert and protect the interests of numerous
    other Dookhan defendants for whom it inevitably will be called
    on to provide (or already is providing) representation.
    5
    on October 21, 2014, reserved and reported the entire case to
    the full court.
    For the reasons that follow, we now conclude that (1) a
    defendant who has been granted a new trial based on Dookhan's
    misconduct at the Hinton drug lab cannot be charged with a more
    serious offense than that of which he or she initially was
    convicted under the terms of a plea agreement and, if convicted
    again, cannot be given a more severe sentence than that which
    originally was imposed; (2) the motion to intervene filed by
    CPCS is allowed; (3) a so-called "global remedy" will not be
    implemented at this time; (4) a lawyer who represented a Dookhan
    defendant at the plea stage of criminal proceedings is not
    barred by the advocate-witness rule from subsequently
    representing that defendant and testifying at an evidentiary
    hearing on the defendant's motion to withdraw a guilty plea; (5)
    the scope of cross-examination of a Dookhan defendant at a
    hearing on a motion to withdraw a guilty plea is left to the
    broad discretion of the motion judge; and (6) the testimony of a
    Dookhan defendant at a hearing on a motion to withdraw a guilty
    plea is only admissible at a subsequent trial for impeachment
    purposes if the defendant chooses to testify.8
    8
    We acknowledge the amicus briefs submitted by Families
    Against Mandatory Minimums and others, and by the National
    Association of Criminal Defense Lawyers and the Massachusetts
    Association of Criminal Defense Lawyers.
    6
    1.   Background.    a.   Kevin Bridgeman.   On April 8, 2005,
    members of the Boston police department's drug control unit were
    conducting an undercover operation in the theater district.
    Officer Greg T. Walsh approached Bridgeman and purchased two
    rocks of what appeared to be "crack" cocaine for forty dollars
    in controlled "buy" money.    Officers then attempted to arrest
    Bridgeman, whereupon he resisted and struck one of the officers
    with a closed fist.    When Bridgeman was searched after his
    arrest, officers found twenty-two plastic bags containing what
    appeared to be crack cocaine and the forty dollars in buy money.
    On June 2, 2005, a Suffolk County grand jury indicted
    Bridgeman on charges of possession of a class B controlled
    substance (cocaine) with intent to distribute, as a second or
    subsequent offense, G. L. c. 94C, § 32A (b) (count one);
    distribution of a class B controlled substance (cocaine), as a
    second or subsequent offense, G. L. c. 94C, § 32A (b) (count
    three); violation of the controlled substances laws in proximity
    to a school, G. L. c. 94C, § 32J (counts two and four); assault
    and battery on a police officer, G. L. c. 265, § 13D (count
    five); and resisting arrest, G. L. c. 268, § 32B (count six).
    The Commonwealth produced drug certificates signed by Dookhan on
    the line labeled "Assistant Analyst," stating that the
    substances at issue contained cocaine as defined in G. L.
    c. 94C, § 31.   Pursuant to a plea agreement, Bridgeman pleaded
    7
    guilty on October 4, 2005, to counts one (first offense), three
    (first offense), five, and six.   The Commonwealth's motion to
    dismiss the second or subsequent offense portions of the
    indictments and the school zone charges was granted.9
    On July 26, 2007, members of the Boston police department's
    drug control unit were conducting an undercover operation around
    Boston Common.   An undercover officer approached Bridgeman,
    engaged him in conversation, walked with him to the Public
    Garden, and then purchased two plastic bags containing what
    appeared to be crack cocaine for forty dollars in buy money.
    Bridgeman was arrested, and when he was searched, officers
    found, among other items, ten additional bags containing what
    appeared to be crack cocaine and the forty dollars in buy money.
    On September 24, 2007, a Suffolk County grand jury indicted
    Bridgeman on charges of possession of a class B controlled
    substance (cocaine) with intent to distribute, as a subsequent
    offense, G. L. c. 94C, § 32A (b) (count one); violation of the
    controlled substances laws in proximity to a park, G. L. c. 94C,
    § 32J (count two); and distribution of a class B controlled
    substance (cocaine), as a subsequent offense, G. L. c. 94C,
    9
    With respect to the charge of possession of cocaine with
    intent to distribute, Bridgeman was sentenced to State prison
    for two to three years. With respect to the charges of
    distribution of cocaine, assault and battery on a police
    officer, and resisting arrest, Bridgeman was sentenced to three
    years' probation, to commence on and after his sentence for
    possession of cocaine with intent to distribute.
    8
    § 32A (b) (count three).    The Commonwealth again produced drug
    certificates signed by Dookhan on the line labeled "Assistant
    Analyst," stating that the substances at issue contained cocaine
    as defined in G. L. c. 94C, § 31.    Pursuant to a plea agreement,
    Bridgeman pleaded guilty on April 17, 2008, to counts one and
    three.10    The Commonwealth's motion to dismiss the park zone
    charge was granted.    Bridgeman has completed service of his
    sentences, but has not yet filed a motion for postconviction
    relief.11
    10
    With respect to the charges of possession of cocaine with
    intent to distribute, subsequent offense, and distribution of
    cocaine, subsequent offense, Bridgeman was sentenced to
    concurrent terms of from three to five years in State prison, to
    be served concurrently with the sentence he already was serving
    on his 2005 conviction of possession of cocaine with intent to
    distribute.
    11
    In an affidavit dated December 30, 2013, filed in
    connection with the petition for relief under G. L. c. 211, § 3,
    Bridgeman stated that, at the time he pleaded guilty to the
    various drug charges, he was unaware of Dookhan's misconduct.
    He further stated that, had he known about Dookhan's misconduct,
    it was reasonably probable that he would have sought dismissal
    of the indictments, would have tried to negotiate a different
    plea agreement with the Commonwealth, or would have gone to
    trial. In an affidavit dated December 19, 2013, Bridgeman's
    trial counsel with respect to the 2007 charges stated that, at
    the time he advised his client to plead guilty, he was not aware
    of Dookhan's misconduct. If he had been aware of such
    misconduct prior to Bridgeman's pleas, he would have sought
    dismissal of the indictments, and he would have advised
    Bridgeman to either negotiate for a better plea offer or
    consider proceeding to trial. In an affidavit dated January 4,
    2014, Bridgeman's trial counsel with respect to the 2005 charges
    made similar representations.
    9
    b.    Yasir Creach.   On January 7, 2005, members of the
    Boston police department's drug control unit were conducting
    surveillance in the Chinatown section of Boston.    They observed
    Creach engaging in a brief conversation with another man before
    the two entered an alley marked with a "no trespassing" sign.
    The officers followed the men into the alley and saw Creach
    smoking from a glass tube that had been modified into a crack
    pipe.     The officers recovered one rock of what appeared to be
    crack cocaine from the pipe, and Creach was placed under arrest.
    Three days later, a criminal complaint issued from the Central
    Division of the Boston Municipal Court Department charging
    Creach with trespassing, G. L. c. 266, § 120 (count one); and
    possession of a class B controlled substance (cocaine), G. L.
    c. 94C, § 34.    The Commonwealth produced a drug certificate
    signed by Dookhan on the line labeled "Assistant Analyst,"
    stating that the substance at issue contained cocaine as defined
    in G. L. c. 94C, § 31.     Creach pleaded guilty on April 20, 2005,
    to both charges.12    He has completed service of his sentences,
    but has not yet filed a motion for postconviction relief.13
    12
    According to the Commonwealth, Creach was sentenced to
    concurrent terms of incarceration totaling one year in a house
    of correction.
    13
    In an affidavit dated December 30, 2013, filed in
    connection with the petition for relief under G. L. c. 211, § 3,
    Creach stated that, at the time he pleaded guilty to the drug
    charge, he was unaware of Dookhan's misconduct. He further
    10
    c.    Miguel Cuevas.   On January 5, 2007, members of the
    Salem police department were conducting an undercover operation
    in the "Point" neighborhood of Salem.    An undercover officer
    contacted Cuevas by cellular telephone, the two met, and Cuevas
    sold the officer a "twist" of what the officer believed to be
    cocaine for forty dollars in buy money.    Three days later,
    undercover officers again contacted Cuevas by cellular telephone
    and arranged to purchase more cocaine.    Cuevas directed the
    officers to meet him at the corner of Bridge and Rice Streets.
    Once there, the officers picked up Cuevas from the side of the
    road and drove him to the vicinity of a residence on Palmer
    Street.   Cuevas got out of the vehicle, disappeared from sight
    for a few minutes, and then returned with another twist of what
    the officers believed to be cocaine.    On January 10, undercover
    officers once more contacted Cuevas by cellular telephone and
    arranged to purchase cocaine and heroin.    The officers picked up
    Cuevas at the corner of Bridge and Rice Streets and again drove
    him to Palmer Street.   Cuevas got out of the vehicle, briefly
    stated that, had he known about Dookhan's misconduct, it was
    reasonably probable that he would have tried to negotiate a
    different plea agreement with the Commonwealth, or would have
    gone to trial. In an affidavit dated December, 2013, Creach's
    trial counsel stated that, at the time she advised her client to
    plead guilty, she was not aware of Dookhan's misconduct. If she
    had been aware of such misconduct prior to Creach's pleas, she
    would have discussed with him the options of attempting to
    secure a more favorable plea agreement with the Commonwealth or
    proceeding to trial.
    11
    entered Theo's Market, and then returned to the vehicle where he
    sold the officers what appeared to be cocaine and heroin for
    ninety dollars in buy money.
    On October 5, 2007, an Essex County grand jury indicted
    Cuevas on charges of distribution of a class B substance
    (cocaine), as a second or subsequent offense, G. L. c. 94C,
    § 32A (d) (counts one, two, and three); and distribution of a
    class A substance (heroin), as a second or subsequent offense,
    G. L. c. 94C, § 32 (b) (count four).   The Commonwealth produced
    drug certificates signed by Dookhan on the line labeled
    "Assistant Analyst," stating that the substances at issue
    contained, respectively, cocaine and heroin as defined in G. L.
    c. 94C, § 31.   Pursuant to a plea agreement, Cuevas pleaded
    guilty on January 30, 2009, to all four counts.14   The
    Commonwealth did not pursue the second or subsequent offense
    portions of the indictments.   Cuevas has completed service of
    his sentences.15   On October 18, 2012, Cuevas filed a motion to
    14
    Cuevas was sentenced to concurrent terms of between four
    and one-half years and five years in State prison.
    15
    In an affidavit dated December 31, 2013, filed in
    connection with the petition for relief under G. L. c. 211, § 3,
    Cuevas stated that, at the time he pleaded guilty to the various
    drug charges, he was not aware of Dookhan's misconduct. He
    further stated that, had he known about Dookhan's misconduct, it
    was reasonably probable that he would have sought dismissal of
    the indictments, would have tried to negotiate a different plea
    agreement with the Commonwealth, or would have gone to trial.
    In an affidavit dated December 30, 2013, Cuevas's trial counsel
    12
    withdraw his guilty pleas pursuant to Mass. R. Crim. P. 30 (b),
    as appearing in 
    435 Mass. 1501
    (2001), based on Dookhan's
    misconduct at the Hinton drug lab.   That motion remains pending.
    2.   Exposure to harsher punishment.   The petitioners
    contend that our decision in Scott has given rise to a
    substantial fear among Dookhan defendants that by challenging
    their drug convictions, they will subject themselves to harsher
    punishment than was imposed when they pleaded guilty.16      For
    example, they continue, a successful motion for a new trial
    could result in the reinstatement of previously dismissed
    charges that carry mandatory minimum sentences.17   In the
    stated that, at the time he advised his client to plead guilty,
    he was not aware of Dookhan's misconduct. If he had been aware
    of such misconduct prior to Cuevas's pleas, he would have sought
    dismissal of the indictments, and he would have advised Cuevas
    to either negotiate for a better plea offer or consider
    proceeding to trial.
    16
    In their petition for relief under G. L. c. 211, § 3, the
    petitioners do not distinguish between defendants who pleaded
    guilty and those who were convicted after a trial. Our decision
    today only addresses those cases that were resolved on the basis
    of guilty pleas.
    17
    The petitioners point to the case of Angel Rodriguez as a
    cautionary tale. See Commonwealth vs. Rodriguez, Superior Ct.,
    ESCR2007-00875 (Essex County). Rodriguez was indicted on a
    charge of trafficking in cocaine (one hundred grams or more),
    G. L. c. 94C, § 32E (b) (1). He pleaded guilty to a reduced
    charge of trafficking in cocaine (twenty-eight to one hundred
    grams), G. L. c. 94C, § 32E (b) (2), and was sentenced to State
    prison for from five to seven years. After the revelation of
    Dookhan's misconduct, Rodriguez filed a motion to vacate his
    guilty plea pursuant to Mass. R. Crim. P. 30 (b). A judge in
    the Superior Court allowed the motion. The Commonwealth then
    13
    petitioners' view, the magnitude of Dookhan's misconduct has
    placed enormous pressure on the Commonwealth to limit their
    postconviction relief.   They assert that the Commonwealth has an
    aversion to the duplicative expenditure of scarce prosecutorial
    resources, that the judicial system has a bias against retrying
    issues that already have been decided, and that the Commonwealth
    has a desire to preserve convictions.   Consequently, the
    petitioners argue that their fear of receiving a harsher
    punishment has chilled the exercise of their postconviction
    rights.   Given these considerations, the petitioners contend
    that this court should conclude that defendants who plead guilty
    to drug offenses and subsequently are granted new trials based
    on Dookhan's misconduct at the Hinton drug lab cannot (1) be
    charged with more serious offenses than those of which they
    initially were convicted; and (2) if convicted again, cannot be
    given sentences longer than those that originally were imposed.
    Preliminarily, before reaching the merits of the
    petitioners' arguments, we must resolve a procedural matter.
    The Commonwealth asserts that the petitioners' claims are not
    ripe for review because the harm the petitioners have alleged --
    harsher sentences following new trials -- is hypothetical.      The
    charged Rodriguez with trafficking in one hundred grams or more
    of cocaine, a jury convicted him of that charge, and he was
    sentenced to from eight years to eight years and one day in
    State prison. The case of Angel Rodriguez suggests that
    petitioners' fear is not baseless or unwarranted.
    14
    Commonwealth correctly points out that, among the petitioners,
    only Cuevas has sought postconviction relief by filing a motion
    to withdraw his guilty pleas based on Dookhan's misconduct, and
    according to the record, the motion remains pending.   In the
    Commonwealth's view, the harm alleged by the petitioners is
    speculative until such time as the petitioners are granted new
    trials, the Commonwealth charges the petitioners with more
    serious offenses, and, if convicted, the petitioners actually
    receive harsher punishments.   Until those events unfold, the
    Commonwealth continues, the petitioners' claims are not ripe for
    review.
    Generally speaking, "this court will not review [a] matter
    until the entire case is ripe for review due to the burdensome
    nature of 'piecemeal appellate review.'"   Campana v. Directors
    of the Mass. Hous. Fin. Agency, 
    399 Mass. 492
    , 499 n.16 (1987).
    However, given the significance of this case in light of the
    thousands of defendants who have been affected by Dookhan's
    misconduct and now are considering whether to pursue
    postconviction relief, coupled with the impact our decision will
    have on the timely administration of justice in all Hinton drug
    lab cases, we conclude that it is appropriate to review the
    petitioners' claims now in accordance with our broad powers of
    superintendence under G. L. c. 211, § 3.   See Diatchenko v.
    District Attorney for the Suffolk Dist., 
    466 Mass. 655
    , 657 n.5
    15
    (2013), S.C., 
    471 Mass. 12
    (2015).   We agree with the single
    justice that in the unique circumstances of this case, the
    interests of justice dictate immediate resolution of the
    petitioners' claims.   Moreover, we have said that where, as
    here, "the single justice has, in [her] discretion, reserved and
    reported the case to the full court, we grant full appellate
    review of the issues reported."   
    Id., quoting Commonwealth
    v.
    Goodwin, 
    458 Mass. 11
    , 14-15 (2010).
    We turn to the merits of the petitioners' arguments.     Since
    the revelation of Dookhan's egregious misconduct at the Hinton
    drug lab -- a lapse of widespread magnitude in the criminal
    justice system -- we have found it necessary to exercise our
    general superintendence power to ameliorate its damaging
    effects.   In the early stages of the crisis, this court reviewed
    and resolved the legality of plea colloquies conducted by
    special magistrates appointed by the Chief Justice of the
    Superior Court Department of the Trial Court to preside over
    criminal proceedings in cases relating to the Hinton drug lab.
    See Commonwealth v. Charles, 
    466 Mass. 63
    , 65-66, 88-89 (2013).
    Then, in Scott, we articulated a workable approach by which
    judges should evaluate and decide individual motions to withdraw
    guilty pleas brought by defendants affected by Dookhan's
    misconduct.   See 
    Scott, 467 Mass. at 352
    .   See also note 
    6, supra
    .   Now, with this approach in place, it is incumbent on the
    16
    court to address uncertainties regarding the legal implications
    of a defendant's decision to challenge his or her ostensibly
    tainted drug conviction, and the propriety of returning the
    parties to the positions they occupied before entering into a
    plea agreement.   These matters are ones of systemic concern that
    this court shall resolve through the exercise of its general
    superintendence powers under G. L. c. 211, § 3, so as to ensure
    that a fear of more punitive consequences, as expressed by the
    petitioners, does not render their right to seek postconviction
    relief a flawed option.   See Charles, supra at 88-89.
    It is well established that "[r]emedies for prosecutorial
    misconduct should be tailored to the injury suffered and should
    not unnecessarily infringe on competing interests."
    Commonwealth v. Cronk, 
    396 Mass. 194
    , 199 (1985).     See
    Commonwealth v. Wood, 
    469 Mass. 266
    , 290-292 (2014);
    Commonwealth v. Frith, 
    458 Mass. 434
    , 439-440 (2010);
    Commonwealth v. Cinelli, 
    389 Mass. 197
    , 209-210, cert. denied,
    
    464 U.S. 860
    (1983).   "[P]rosecutorial misconduct requires that
    the rights of defendants be balanced against the necessity for
    preserving society's interest in the administration of justice."
    
    Cronk, supra
    .   See 
    Scott, 467 Mass. at 352
    .   In the ordinary
    course, "when a defendant withdraws his [guilty] plea after
    sentencing, he may receive a harsher sentence than was
    originally imposed."   Commonwealth v. DeMarco, 
    387 Mass. 481
    ,
    17
    486 (1982).   See Commonwealth v. DeJesus, 
    468 Mass. 174
    , 178
    (2014) (judge vacated defendant's plea of guilty and reinstated
    portion of indictment charging defendant with trafficking in
    cocaine, which had been dismissed under terms of plea
    agreement); Commonwealth v. Therrien, 
    359 Mass. 500
    , 502-505
    (1971) (allowance of defendant's motion to withdraw plea of
    guilty to murder in second degree subjected defendant to trial
    on charge of murder in first degree with attendant penalties).
    However, a defendant who files a motion to withdraw a guilty
    plea as a consequence of Dookhan's misconduct is not doing so in
    the context of an ordinary criminal case in which the original
    charges brought by the Commonwealth, and their attendant
    sentences, simply can be reinstated as if the plea bargain had
    never occurred.
    A return to the status quo ante would mean ignoring the
    egregious misconduct of Dookhan and disregarding its impact on
    criminal defendants whose drug samples she analyzed.    This
    course of action would present a defendant with two options.    A
    defendant could choose not to file a motion for postconviction
    relief and accept the fact that his or her convictions may have
    been tainted by Dookhan's misconduct.   Alternatively, a
    defendant could choose to file a motion to withdraw his or her
    guilty plea and, if allowed, accept the fact that he or she may
    be subject to a harsher punishment than was imposed when he or
    18
    she pleaded guilty.    Either way, defendants wrongly would bear
    the burden of a systemic lapse that, in the circumstances of the
    Hinton drug lab, we have said is entirely attributable to the
    government, even though there is no indication that prosecutors
    had actual knowledge of Dookhan's misconduct during their
    prosecutions of the Dookhan defendants.      See 
    Scott, 467 Mass. at 347-352
    .    Were it not for Dookhan's actions, defendants would
    not be in the position of having to seek postconviction relief
    from her malfeasance in the first instance.     Moreover, it cannot
    be overlooked that many Dookhan defendants already have served
    the sentences to which they and the Commonwealth agreed.       A
    return to the status quo ante simply is not a legally tenable
    solution, given that "[w]e must account for the due process
    rights of defendants . . . [and] the integrity of the criminal
    justice system."    Scott, supra at 352.   The proper solution is
    one that takes into consideration the interests of the Dookhan
    defendants and the Commonwealth, recognizing that "in the wake
    of government misconduct that has cast a shadow over the entire
    criminal justice system, it is most appropriate that the benefit
    of our remedy inure to defendants."    
    Id. See Lavallee
    v.
    Justices in the Hampden Superior Court, 
    442 Mass. 228
    , 246
    (2004).
    A plea bargain often has been compared to an enforceable
    contract.    See Commonwealth v. Tirrell, 
    382 Mass. 502
    , 512
    19
    (1981); Commonwealth v. Cruz, 
    62 Mass. App. Ct. 610
    , 611 (2004).
    "[W]hen a plea rests in any significant degree on a promise or
    agreement of the prosecutor, so that it can be said to be part
    of the inducement or consideration, such promise must be
    fulfilled."    Santobello v. New York, 
    404 U.S. 257
    , 262 (1971).
    See Correale v. United States, 
    479 F.2d 944
    , 947 (1st Cir. 1973)
    ("the most meticulous standards of both promise and performance
    must be met by prosecutors engaging in plea bargaining").    We
    have said that "when the prosecutor enters into plea bargain
    agreements, 'the court will see that due regard is paid to them,
    and that the public faith which has been pledged by him is duly
    kept.'"    Commonwealth v. Santiago, 
    394 Mass. 25
    , 28 (1985),
    quoting Commonwealth v. Benton, 
    356 Mass. 447
    , 448 (1969).      See
    Cruz, supra at 612; Doe v. District Attorney for the Plymouth
    Dist., 
    29 Mass. App. Ct. 671
    , 673 (1991).    See also Reporters'
    Notes to Mass. R. Crim. P. 12, Mass. Ann. Laws Court Rules,
    Rules of Criminal Procedure, at 1491-1492 (LexisNexis 2014-
    2015).
    Here, before the revelation of Dookhan's misconduct, the
    petitioners and the Commonwealth entered into plea agreements
    that both parties considered to be mutually advantageous and
    fair.    The petitioners agreed to waive various constitutional
    rights associated with proceeding to trial, and to relieve the
    Commonwealth of its burden of proving the petitioners' guilt
    20
    beyond a reasonable doubt.   See Commonwealth v. Lopez, 
    447 Mass. 625
    , 628 (2006) (guilty plea constitutes waiver of three
    constitutional rights:   right to jury trial, right to confront
    one's accusers, and privilege against self-incrimination).    See
    also Commonwealth v. Russell, 
    470 Mass. 464
    , 468 (2015) ("In a
    criminal case, due process requires that the Commonwealth prove
    the defendant's guilt beyond a reasonable doubt").    In exchange,
    the Commonwealth agreed to reduce the charges against the
    petitioners,18 and, consequently, the sentences that would be
    imposed by a judge.   Any subsequent motions to withdraw those
    guilty pleas must be viewed as an inevitable result of the
    disclosure of Dookhan's misconduct.   That being the case, the
    Commonwealth cannot simply reprosecute the petitioners as if the
    plea agreements had never existed, thereby giving the
    Commonwealth a second bite at the proverbial apple in its
    efforts to convict the petitioners.   Instead, the Commonwealth
    must be held to the terms of its plea agreements.19
    18
    It does not appear from the record that the charges
    against Creach actually were reduced as a consequence of his
    plea agreement with the Commonwealth. That said, the writing on
    the tender of plea form is virtually unreadable.
    19
    In those cases where Dookhan defendants have completed
    service of their sentences, the Commonwealth has obtained the
    full benefit of its plea agreements. If, following a Dookhan
    defendant's successful withdrawal of a guilty plea, the
    Commonwealth could reinstate previously dismissed charges that
    carry mandatory minimum sentences and reprosecute a defendant on
    all of the charges, the Commonwealth ultimately could benefit
    21
    Therefore, we hold that in cases in which a defendant seeks
    to withdraw a guilty plea under Mass. R. Crim. P. 30 (b) as a
    result of the revelation of Dookhan's misconduct, and where the
    motion is allowed, the defendant cannot (1) be charged with a
    more serious offense than that of which he or she initially was
    convicted under the terms of a plea agreement; and (2) if
    convicted again, cannot be given a more severe sentence than
    that which originally was imposed.   In essence, a defendant's
    sentence is capped at what it was under the plea agreement.    See
    Ferrara v. United States, 
    372 F. Supp. 2d 108
    , 111 (D. Mass.
    2005), aff'd, 
    456 F.3d 278
    (1st Cir. 2006) (when determining
    proper remedy for government misconduct, "[t]he court's goal is
    to fashion a remedy that will, as much as possible, place [the
    defendant] in the position that he would have been in if the
    government had not violated his constitutional right to [d]ue
    [p]rocess").   Our holding will enable the Commonwealth to
    reprosecute defendants as appropriate, such as where there is
    sufficient untainted evidence for the Commonwealth to satisfy
    its burden of proving the charged crimes beyond a reasonable
    doubt.   At the same time, our holding also will safeguard the
    integrity of the criminal justice system by ensuring that
    from Dookhan's misconduct. Successful reprosecution of a
    defendant could result in the imposition of a longer sentence.
    Even if the Commonwealth's reprosecution were not successful,
    such a defendant already would have served the agreed-upon
    sentence under the previous plea agreement.
    22
    defendants may challenge convictions of drug crimes based on
    tainted evidence.
    3.   Undue delay in postconviction relief.   The petitioners
    assert that the Commonwealth has violated their due process
    rights by unduly delaying the provision of postconviction relief
    to Dookhan defendants.   They point out that, among other lapses,
    there is no comprehensive list of docket numbers identifying all
    of the cases in which Dookhan served as either the primary or
    secondary chemist,20 and that lawyers have not yet been appointed
    for approximately 30,000 individuals.   In the petitioners' view,
    these delays have been prejudicial because the Dookhan
    defendants must contend with the ongoing uncertainties over and
    the collateral consequences of their purportedly tainted
    convictions.   The petitioners propose that we order the
    following relief:   (1) the Commonwealth should be given ninety
    days to notify individual defendants, or their counsel, whether
    20
    The petitioners acknowledge that in September, 2014, the
    district attorneys for the Suffolk and Essex Districts provided
    CPCS with docket numbers for the cases from Suffolk and Essex
    Counties, respectively, in which Dookhan analyzed the drug
    samples as either the primary or secondary chemist. We are
    aware that since the oral argument in this case, the district
    attorneys for the Bristol and Norfolk Districts also have
    provided to CPCS docket numbers for such cases in their
    respective counties. Other district attorneys, including those
    for the Cape and Islands, Middlesex, and Plymouth Districts,
    have not done so.
    23
    it intends to reprosecute their cases;21 (2) defendants who do
    not receive such notification within ninety days will be
    entitled to have their convictions vacated with prejudice; and
    (3) if timely notice is provided, the Commonwealth will have six
    months to bring the cases to trial or to conclude them with
    guilty pleas.
    With regard to the matter of undue delay, "[t]he guaranty
    of a speedy trial set forth in the Sixth Amendment to the United
    States Constitution (and art. 11 of the Massachusetts
    Declaration of Rights) is not read as applying to the appellate
    process."    Commonwealth v. Lee, 
    394 Mass. 209
    , 220 (1985),
    quoting Williams, petitioner, 
    378 Mass. 623
    , 625 (1979).
    However, this court has said that "deliberate blocking of
    appellate rights or inordinate and prejudicial delay without a
    defendant's consent, may rise to the level of constitutional
    error."     Commonwealth v. Swenson, 
    368 Mass. 268
    , 279-280 (1975).
    See Commonwealth v. Thomas, 
    400 Mass. 676
    , 684 (1987).     "The
    fundamental requirement of due process is the opportunity to be
    heard 'at a meaningful time and in a meaningful manner.'"
    Mathews v. Eldridge, 
    424 U.S. 319
    , 333 (1976), quoting Armstrong
    v. Manzo, 
    380 U.S. 545
    , 552 (1965).    See Paquette v.
    Commonwealth, 
    440 Mass. 121
    , 131 (2003), cert. denied, 
    540 U.S. 1150
    (2004).    We recognize that an inordinate delay in resolving
    21
    See note 
    5, supra
    .
    24
    the Hinton drug lab cases may result in a loss of liberty if an
    incarcerated defendant's conviction is overturned, and "may
    entail anxiety, forfeiture of opportunity, and damage to
    reputation, among other conceivable injuries."   Williams,
    petitioner, supra at 626.   At the same time, our response to
    Dookhan's misconduct necessarily requires consideration of not
    only "the due process rights of defendants," but also "the
    integrity of the criminal justice system, the efficient
    administration of justice in responding to such potentially
    broad-ranging misconduct, and the myriad public interests at
    stake."   
    Scott, 467 Mass. at 352
    .
    Given the unprecedented circumstances surrounding the
    debacle at the Hinton drug lab, and the substantial efforts that
    are being made to deal with the impact of Dookhan's misconduct
    on affected defendants, we conclude that, at this juncture, any
    delays in the provision of postconviction relief do not "rise to
    the level of constitutional error."   
    Swenson, 368 Mass. at 280
    .
    Our decisions in Scott, see note 
    6, supra
    , and Charles22 have
    22
    In Commonwealth v. Charles, 
    466 Mass. 63
    (2013), this
    court concluded that, "[i]n exceptional circumstances, a judge
    of the Superior Court [has] the authority to allow a defendant's
    motion to stay the execution of his sentence, then being served,
    pending disposition of the defendant's motion for a new trial."
    
    Id. at 79.
    We further concluded that special magistrates have
    the authority under Mass. R. Crim. P. 47, 
    378 Mass. 923
    (1979),
    to conduct guilty plea colloquies with defendants in special
    drug lab sessions, and to report their findings concerning such
    issues as the voluntariness of the proposed plea and the factual
    25
    provided Dookhan defendants and the Commonwealth with meaningful
    solutions for addressing concerns that have arisen as defendants
    attempt to challenge their drug convictions.   In particular, the
    special evidentiary rule that we created in Scott is designed to
    enable a defendant "to establish the requisite nexus between
    egregious government wrongdoing and the defendant's [own] case"
    and to "relieve the trial courts of the administrative burden of
    making duplicative and time-consuming findings in potentially
    thousands of new trial motions regarding the nature and extent
    of Dookhan's wrongdoing."   
    Scott, 467 Mass. at 353
    .   Affidavits
    from assistant district attorneys in the Bristol, Essex,
    Middlesex, Norfolk, and Suffolk Districts regarding the progress
    of motions for new trials or motions to withdraw guilty pleas
    filed by Dookhan defendants suggest that they are being resolved
    at a steady pace.23
    That said, we recognize that there has been some delay in
    providing Dookhan defendants with postconviction relief given
    basis for the plea to a presiding justice of the Superior Court.
    See 
    id. at 66,
    85-87, 89-91.
    23
    These affidavits are included in the Commonwealth's
    supplemental appendix, which is not a part of the record in this
    case. The Commonwealth has not filed a motion to supplement the
    record. At the same time, the petitioners have not filed a
    motion to strike the Commonwealth's supplemental appendix. On
    October 7, 2014, CPCS filed its own motion to supplement the
    record pursuant to Mass. R. A. P. 8 (e), as amended, 
    378 Mass. 932
    (1979). See note 27, infra. In light of our decision to
    allow the motion filed by CPCS, see 
    id., and in
    the interest of
    fairness, we shall consider the Commonwealth's supplemental
    appendix to be a part of the record in this case.
    26
    their reluctance to file motions to withdraw their guilty pleas
    because of fears that they will be reprosecuted on more serious
    charges and will face harsher punishments than resulted from
    their plea agreements.    Here, for example, neither Bridgeman nor
    Creach has filed a motion to withdraw his guilty pleas.    Our
    decision today should alleviate those fears and remove a
    significant impediment to further proceedings pertaining to
    their convictions.
    We also realize that efforts to provide postconviction
    relief to Dookhan defendants have been hampered by the inability
    of CPCS to ascertain which cases may have been tainted by
    Dookhan's misconduct.    The ability of CPCS to identify clients
    and to assign them attorneys who will represent their interests
    in postconviction proceedings is crucial to the administration
    of justice in the Hinton drug lab cases.24   During earlier
    proceedings in this case in the county court, the Commonwealth
    commendably provided the single justice and CPCS with the docket
    numbers (and other relevant identifying information) of the
    Suffolk County and Essex County cases in which Dookhan analyzed
    the drug samples as either the primary or secondary chemist.
    See Mass. R. Prof. C. 3.8 (d), 
    426 Mass. 1397
    (1998) ("The
    prosecutor in a criminal case shall . . . make timely disclosure
    24
    We focus here on CPCS, but recognize that not all Dookhan
    defendants were represented by CPCS attorneys.
    27
    to the defense of all evidence or information known to the
    prosecutor that tends to negate the guilt of the accused or
    mitigates the offense . . .").    While recognizing that only the
    district attorneys for the Suffolk and Essex Districts currently
    are parties to this case, we encourage the district attorneys
    for the districts in other counties in which Dookhan analyzed
    drug samples as either the primary or secondary chemist to
    assist the single justice in obtaining docket numbers (and other
    relevant identifying information) for those cases.    See note 
    20, supra
    .
    4.   Motion to intervene by CPCS.    We begin with some
    pertinent background.    On March 12, 2013, CPCS filed a motion to
    intervene in earlier litigation arising as a consequence of
    Dookhan's misconduct at the Hinton drug lab.    See Commonwealth
    vs. Charles, No. SJ-2013-0066, S.C., Commonwealth v. Charles,
    
    466 Mass. 63
    (2013).    Among other reasons for its motion, CPCS
    sought to "preserve its clients' due process rights to the just
    and timely resolution of the many thousands of previously-
    adjudicated cases tainted by the systemic malfeasance and
    incompetence at the Hinton Drug Lab" and to "advocate for
    remedies that [would] restore the integrity of the criminal
    justice system."   A single justice denied the motion, without
    prejudice to renewal, concluding that it was premature in light
    of the ongoing investigations of the Hinton drug lab by Attorney
    28
    David Meier and by the office of the Inspector General.    The
    single justice stated that CPCS would have an opportunity to
    renew its motion "at an appropriate time."   In the view of CPCS,
    now is the appropriate time for intervention on the side of the
    petitioners.
    On May 27, 2014, CPCS filed its motion to intervene in the
    present case pursuant to Mass. R. Civ. P. 24 (a).25   CPCS agrees
    with and supports the positions taken by the petitioners.    It
    contends that tens of thousands of defendants who pleaded guilty
    to various drug offenses without any knowledge of Dookhan's
    misconduct require the assistance of counsel to secure relief
    from the violation of their due process rights, and CPCS
    inevitably will be called on to provide (or already is
    providing) representation.   Beyond the issues raised by the
    petitioners, CPCS asserts that its ability to assign counsel for
    Dookhan defendants has been hindered by the position taken by
    prosecutors in at least one county that a lawyer who represented
    a defendant at the plea stage of criminal proceedings may not
    thereafter represent and testify on behalf of that defendant at
    a hearing on a motion to withdraw a guilty plea without
    25
    As acknowledged by CPCS, its motion to intervene does not
    delve into our jurisprudence on intervention. Nonetheless, CPCS
    has incorporated by reference the legal arguments that it made
    in its prior motion to intervene, filed on March 12, 2013, and
    that earlier motion has been included in the record of the
    present case.
    29
    violating Mass. R. Prof. C. 3.7 (a), 
    426 Mass. 1396
    (1998)
    (advocate-witness rule).26   In the view of CPCS, such "dual role
    representation" should be permitted.   CPCS also asserts that
    Dookhan defendants are concerned about pursing postconviction
    relief because special magistrates, at hearings on motions to
    withdraw guilty pleas, have permitted wide-ranging cross-
    examination of defendants regarding their factual guilt.27   CPCS
    26
    Rule 3.7 (a) of the Massachusetts Rules of Professional
    Conduct, 
    426 Mass. 1396
    (1998), provides, in pertinent part,
    that "[a] lawyer shall not act as advocate at a trial in which
    the lawyer is likely to be a necessary witness except where
    . . . disqualification of the lawyer would work substantial
    hardship on the client."
    27
    With respect to this issue, on October 7, 2014, CPCS
    filed a motion to supplement the record pursuant to Mass. R. A.
    P. 8 (e). It seeks to include in the record the transcript of a
    hearing before a special magistrate and other papers from
    Commonwealth vs. Cruz, Superior Ct., SUCR2009-10595 (Suffolk
    County). CPCS asserts that these papers are relevant to the
    question of the permissible scope of cross-examination when a
    Dookhan defendant testifies in support of a motion to withdraw a
    guilty plea. Defense attorneys have taken the position that
    cross-examination on the facts of the case should be limited to
    the defendant's understanding of the nature and extent of the
    prosecution's evidence. Prosecutors have argued that the "full
    context" of a defendant's plea decision under 
    Scott, 467 Mass. at 357
    , opens the door to an inquiry encompassing the
    defendant's factual guilt. According to CPCS, rulings by
    special magistrates on this issue have varied widely. For
    example, in the Cruz 
    case, supra
    , the special magistrate
    permitted the prosecutor, over objection, to cross-examine the
    defendant about his culpability for two drug offenses -- what he
    had done, said, and known regarding the alleged contraband in
    question -- and to ask the defendant whether he had pleaded
    guilty because, in fact, he was guilty. In the view of CPCS,
    the inclusion of these papers in the record will assist this
    court in deciding whether the testimony of a Dookhan defendant
    at a hearing on a motion to withdraw a guilty plea can be used
    30
    takes the position that the testimony of a Dookhan defendant at
    such a hearing should be deemed inadmissible in any subsequent
    reprosecution of the defendant, except for perjury.28   The
    Commonwealth opposes CPCS's motion to intervene on the grounds
    that the interests of CPCS are adequately represented by the
    petitioners, CPCS has not shown that it has other interests that
    would be impaired by the disposition of the petition for relief
    under G. L. c. 211, § 3, and CPCS seeks relief beyond the scope
    of the petition.
    Rule 24 of the Massachusetts Rules of Civil Procedure, 
    365 Mass. 769
    (1974), provides:
    "(a) Intervention of Right. Upon timely application
    anyone shall be permitted to intervene in an action: (1)
    when a statute of the Commonwealth confers an unconditional
    right to intervene or (2) when the applicant claims an
    interest relating to the property or transaction which is
    the subject of the action and [the applicant] is so
    situated that the disposition of the action may as a
    practical matter impair or impede [the applicant's] ability
    in a subsequent reprosecution of the defendant. The
    Commonwealth has not filed an objection to CPCS's motion to
    supplement the record, and the single justice included the
    motion as part of her reservation and report to the full court.
    Because the transcript and other papers from the Cruz case
    provide helpful background information on this issue, we allow
    the motion to supplement the record.
    28
    CPCS has raised several additional issues in its motion
    to intervene. However, in a letter to the single justice dated
    September 26, 2014, CPCS limited the issues that it wanted
    reserved and reported to the full court to those that we have
    mentioned.
    31
    to protect that interest, unless [such] interest is
    adequately represented by existing parties."29
    Judges have "broad discretion in deciding whether to permit
    intervention."   Cruz Mgt. Co. v. Thomas, 
    417 Mass. 782
    , 785
    (1994).   See Corcoran v. Wigglesworth Mach. Co., 
    389 Mass. 1002
    ,
    1003 (1983).
    Intervention should be allowed as of right when "(1) the
    applicant claims an interest in the subject of the action, and
    (2) [the applicant] is situated so that [its] ability to protect
    this interest may be impaired as a practical matter by the
    disposition of the action, and (3) [the applicant's] interest is
    not adequately represented by the existing parties."30
    Massachusetts Fed'n of Teachers, AFT, AFL-CIO v. School Comm. of
    Chelsea, 
    409 Mass. 203
    , 205 (1991) (Massachusetts Fed'n of
    Teachers).   Given that rule 24 (a) (2) "does not articulate
    explicit criteria for determining the sufficiency of the
    asserted interest," appellate courts "have agreed that a
    'flexible, rather than rigid approach is indicated,' and that
    29
    CPCS has not identified the subsection of Mass. R. Civ.
    P. 24 (a), 
    365 Mass. 769
    (1974), on which it bases its motion.
    In the absence of an apparent statutory right to intervene, we
    shall assume that CPCS is relying on rule 24 (a) (2).
    30
    Given that CPCS filed an earlier motion to intervene that
    was denied as premature, we need not consider the threshold
    question whether the present motion is timely. See Corcoran v.
    Wigglesworth Mach. Co., 
    389 Mass. 1002
    , 1003 (1983); Bolden v.
    O'Connor Café of Worcester, Inc., 
    50 Mass. App. Ct. 56
    , 61
    (2000).
    32
    'the requirement should be viewed as a prerequisite rather than
    relied upon as a determinative criterion for intervention.'"
    Bolden v. O'Connor Café of Worcester, Inc., 
    50 Mass. App. Ct. 56
    , 62 (2000), quoting Cosby v. Department of Social Servs., 
    32 Mass. App. Ct. 392
    , 395-396 (1992).   The United States Supreme
    Court has stated that the interest in the litigation must be
    "significantly protectable," Donaldson v. United States, 
    400 U.S. 517
    , 531 (1971), and it "must be sufficiently direct and
    immediate to justify the intervention."    
    Bolden, supra
    .   See
    Johnson Turf & Golf Mgt., Inc. v. Beverly, 
    60 Mass. App. Ct. 386
    , 390 (2004).   An interest that is "remote" or "contingent"
    or "tangential" or "collateral" will not suffice.    
    Bolden, supra
    .   "In the end, however, there is 'no convenient rule of
    thumb' which we can employ [in deciding whether the interest
    prerequisite has been satisfied], . . . and we are thrown back
    upon the need for a practical, case-specific, fact-intensive
    analysis."   
    Id., quoting Mayflower
    Dev. Corp. v. Dennis, 
    11 Mass. App. Ct. 630
    , 635 (1981).
    We add that "the 'interest' requirement should be viewed
    more leniently in cases that, as here, implicate questions of
    public interest" and the potential impairment of such interest.
    Johnson Turf & Golf Mgt., 
    Inc., supra
    .    See, e.g., Cruz Mgt.
    
    Co., 417 Mass. at 786
    (Massachusetts Housing Finance Agency
    [MHFA] allowed to intervene in case raising "significant
    33
    question of how damages should be calculated in an action for a
    breach of the implied warranty of habitability brought by a
    tenant who [was] the beneficiary of rent subsidies" paid by MHFA
    because, as administrator of so-called "Section 8" program, MHFA
    was proper party to raise concerns about impact of litigation on
    that program); Planned Parenthood League of Mass., Inc. v.
    Blake, 
    417 Mass. 467
    , 468-469, 479 n.13, cert. denied, 
    513 U.S. 868
    (1994) (Attorney General allowed to intervene in name of
    Commonwealth to represent public interest in civil rights action
    involving access to facilities providing abortion counselling or
    services); 
    Cosby, 32 Mass. App. Ct. at 396-397
    (labor union
    allowed to intervene as of right in litigation between several
    members and employer where union had strong interest in
    balancing conflicting policies underlying seniority provisions
    and affirmative action requirements of collective bargaining
    agreement, in preserving integrity of grievance process, and in
    ensuring ability to protect interests of all union members).
    An applicant for intervention as of right has the burden of
    showing that representation of its interests by an existing
    party will be inadequate.   See Massachusetts Fed'n of 
    Teachers, 409 Mass. at 206
    ; Attorney Gen. v. Brockton Agric. Soc'y, 
    390 Mass. 431
    , 434 (1983).   "The question whether the prospective
    intervener is adequately represented necessarily turns to a
    comparison of the interests asserted by the applicant and the
    34
    existing party."    Mayflower Dev. 
    Corp., 11 Mass. App. Ct. at 636
    .    See Massachusetts Fed'n of 
    Teachers, supra
    ("There is no
    single standard for determining when an applicant has carried
    his burden because the circumstances of the case determine the
    weight of that burden").    If the interest of the prospective
    intervener "is identical to that of one of the present parties,
    or if there is a party charged by law with representing his
    interest, then a compelling showing should be required to
    demonstrate why this representation is not adequate."    Mayflower
    Dev. 
    Corp., supra
    at 637, quoting 7A C.A. Wright & A.R. Miller,
    Federal Practice and Procedure § 1909, at 524 (1972) (Wright &
    Miller).    See Planned Parenthood League of Mass., Inc. v.
    Attorney Gen., 
    424 Mass. 586
    , 599 (1997); Massachusetts Fed'n of
    
    Teachers, supra
    at 206-207; Attorney Gen. v. Brockton Agric.
    
    Soc'y, supra
    .    If the prospective intervener's interest "is
    similar to, but not identical with that of one of the parties, a
    discriminating judgment is required on the circumstances of the
    particular case, but [the applicant] ordinarily should be
    allowed to intervene unless it is clear that the [existing]
    party will provide adequate representation for the [applicant]."
    Mayflower Dev. 
    Corp., supra
    , quoting Wright & 
    Miller, supra
    .
    See 
    Cosby, 32 Mass. App. Ct. at 397-398
    .
    We conclude that CPCS's motion to intervene should be
    allowed.    CPCS is an entity established by statute to "plan,
    35
    oversee, and coordinate the delivery of criminal and certain
    noncriminal legal services" to indigent defendants.31   G. L.
    c. 211D, § 1.   It has a substantial and immediate interest in
    these proceedings given its current and future responsibility
    for providing representation to thousands of indigent Dookhan
    defendants who want to pursue postconviction relief from their
    drug convictions.   It cannot be overstated that CPCS has been
    and will be asked to expend significant resources to handle
    countless numbers of these cases.   We agree with the
    Commonwealth that there is some overlap in the matters raised by
    31
    Pursuant to G. L. c. 211D, § 5, CPCS is required to
    "establish, supervise and maintain a system for the appointment
    or assignment of counsel at any stage of a proceeding, either
    criminal or noncriminal in nature, provided, however, that the
    laws of the commonwealth or the rules of the supreme judicial
    court require that a person in such proceeding be represented by
    counsel; and, provided further, that such person is unable to
    obtain counsel by reason of his indigency." The Commonwealth
    asserts that G. L. c. 211D does not authorize CPCS to intervene
    on behalf of a broad class of unnamed defendants whom it may or
    may not represent. Plainly, not all Dookhan defendants will be
    represented by CPCS in the event they seek postconviction
    relief. Nonetheless, the claims that have been raised in these
    proceedings are fundamental to the mission and responsibilities
    of CPCS, and will impact defendants beyond those currently
    identified as clients of CPCS. See, e.g., Edwards, petitioner,
    
    464 Mass. 454
    , 455, 458 (2013) (CPCS allowed to intervene in
    case deciding whether, in determining reasonable compensation to
    be paid expert retained by indigent petitioner seeking release
    from commitment as sexually dangerous person, judge is bound by
    hourly rate set by CPCS); Adoption of Meaghan, 
    461 Mass. 1006
    ,
    1006 (2012) (CPCS allowed to intervene to seek ruling whether
    father and child entitled to appointed counsel in case initiated
    by private parties involving termination of parental rights).
    For these reasons, the fact that CPCS has moved to intervene on
    behalf of a broad class of unnamed individuals is not a bar to
    the allowance of its motion.
    36
    CPCS and the petitioners, especially with regard to the issue of
    exposure to harsher punishment.   However, the interests of CPCS
    go well beyond those articulated by the petitioners.
    CPCS is in the position of having to provide representation
    to Dookhan defendants in eight counties, and, as such, it has a
    compelling interest in advocating for uniform practices and
    solutions that will ensure consistent treatment for all of those
    defendants, irrespective of their individual jurisdictions.
    Limiting our review in this case to the specific concerns raised
    by the petitioners will hamper the timely ability of CPCS to
    address wider problems that inevitably have arisen as Dookhan
    defendants consider whether to pursue postconviction relief.
    The interests of CPCS are not and cannot be adequately
    represented by the petitioners.   At the same time, contrary to
    the Commonwealth's assertion, CPCS is not attempting improperly
    to interject in these proceedings matters that are independent
    from or wholly unrelated to the relief sought by the
    petitioners.   Contrast Coggins v. New England Patriots Football
    Club, Inc., 
    397 Mass. 525
    , 539 (1986); Rothberg v.
    Schmiedeskamp, 
    334 Mass. 172
    , 178 (1956).   The additional issues
    raised by CPCS are directly connected to its ability to provide
    representation for Dookhan defendants and to its assessment of
    the benefits of pursing postconviction relief for those
    individuals.   At this juncture, it is appropriate that CPCS,
    37
    which will be shouldering much of the burden for attempting to
    resolve the Hinton drug lab cases, be permitted to intervene in
    the present case.
    5.   Global remedy.   CPCS contends that, in accordance with
    our broad powers of superintendence under G. L. c. 211, § 3,
    this court should implement a "global remedy" to resolve, once
    and for all, the tens of thousands of cases affected by
    Dookhan's egregious misconduct at the Hinton drug lab.    In the
    view of CPCS, the time and expense of proceeding on a case-by-
    case basis has become untenable.   Therefore, it proposes a two-
    part solution.   First, CPCS asserts that this court should
    vacate the convictions of all Dookhan defendants.   Second, it
    continues, this court should dismiss all such cases with
    prejudice or, in the alternative, give the Commonwealth a
    limited opportunity to reprosecute individual cases in which
    there is sufficient untainted evidence to prove the drug charges
    beyond a reasonable doubt.   Those cases that are not
    reprosecuted within one year, CPCS asserts, should be dismissed
    with prejudice in accordance with the speedy trial rule, Mass.
    R. Crim. P. 36 (b) (1) (D), as amended, 
    422 Mass. 1503
    (1996).
    We decline to implement a global remedy at this time.      As
    we have said, our decisions in Scott and Charles have provided
    Dookhan defendants and the Commonwealth with meaningful
    solutions for addressing concerns that have arisen as these
    38
    defendants attempt to challenge their drug convictions.    Our
    decision today will go a long way in resolving additional
    concerns that have surfaced and in moving these cases forward
    towards resolution.    We stated in 
    Scott, 467 Mass. at 352
    , that
    when fashioning a workable approach for handling these cases, we
    must "account for the due process rights of defendants, the
    integrity of the criminal justice system, the efficient
    administration of justice in responding to such potentially
    broad-ranging misconduct, and the myriad public interests at
    stake."    We also noted that while "[i]t certainly is true that
    we cannot expect defendants to bear the burden of a systemic
    lapse, . . . we also cannot allow the misconduct of one person
    to dictate an abrupt retreat from the fundamentals of our
    criminal justice system."    
    Id. at 354
    n.11, and cases cited.     In
    our view, the implementation of a "one size fits all" approach
    is not presently a workable solution.
    6.    Advocate-witness rule.   CPCS asserts that, by
    necessity, the vast majority of its assignments of counsel to
    Dookhan defendants for the pursuit of postconviction relief have
    been to the same attorneys who handled the defendants' guilty
    pleas.    However, according to CPCS, prosecutors in at least one
    county have objected to this dual role representation, arguing
    that it is prohibited by Mass. R. Prof. C. 3.7 (a).    CPCS
    contends that, given the urgent need for timely resolution of
    39
    innumerable Hinton drug lab cases, rule 3.7 (a) should not
    disqualify a lawyer who represented a Dookhan defendant at the
    plea stage of criminal proceedings from subsequently
    representing that defendant and testifying at an evidentiary
    hearing on the defendant's motion to withdraw a guilty plea.     We
    agree.
    Rule 3.7 (a) of the Massachusetts Rules of Professional
    Conduct states, in relevant part, that "[a] lawyer shall not act
    as advocate at a trial in which the lawyer is likely to be a
    necessary witness except where . . . disqualification of the
    lawyer would work substantial hardship on the client" (emphasis
    added).   In Smaland Beach Ass'n, Inc. v. Genova, 
    461 Mass. 214
    ,
    219-226 (2012) (Smaland), this court discussed the purposes and
    scope of attorney disqualification under rule 3.7 (a).    We
    stated that "[t]he primary purpose of the rule is 'to prevent
    the jury as fact finder from becoming confused by the
    combination of the roles of attorney and witness.'"     
    Id. at 220,
    quoting Steinert v. Steinert, 
    73 Mass. App. Ct. 287
    , 291 (2008).
    See comment [2] to rule 3.7 ("A witness is required to testify
    on the basis of personal knowledge, while an advocate is
    expected to explain and comment on evidence given by others.     It
    may not be clear whether a statement by an advocate-witness
    should be taken as proof or as an analysis of the proof").     In
    addition, rule 3.7 (a) obviates the possibility that a lawyer
    40
    "will appear to vouch for his own credibility," Culebras Enters.
    Corp. v. Rivera-Rios, 
    846 F.2d 94
    , 99 (1st Cir. 1988); mitigates
    the perception that "the testifying lawyer may well be
    distorting the truth for the sake of his client," id.; and
    "relieves the opposing counsel of the difficult task of cross-
    examining his lawyer-adversary."   
    Smaland, 461 Mass. at 220
    .
    See Borman v. Borman, 
    378 Mass. 775
    , 786-787 (1979); Serody v.
    Serody, 
    19 Mass. App. Ct. 411
    , 413-414 (1985).   Weighing against
    these benefits is the substantial countervailing fact that rule
    3.7 (a) "carries with it the severe consequence of stripping a
    party of chosen counsel."   
    Smaland, supra
    .   See Commonwealth v.
    Perkins, 
    450 Mass. 834
    , 853 & n.15 (2008) (criminal defendant
    generally enjoys right to be represented by counsel of own
    choosing).
    Significantly, we pointed out in 
    Smaland, 461 Mass. at 225
    ,
    that rule 3.7 (a), by its plain language, prohibits a lawyer
    from acting as both an advocate and a necessary witness "at
    trial."   There, the court analyzed the prohibitions of rule 3.7
    (a) in the context of a lawyer-witness's pretrial representation
    of his clients and concluded that "an attorney considered to be
    a necessary witness may participate in pretrial proceedings,
    though it would be particularly prudent first to secure client
    consent after consultation."   
    Smaland, supra
    at 226.    We
    determined that such a reading of rule 3.7 (a) "adheres to its
    41
    text and fulfils its underlying purposes."   
    Id. Concerns about
    potential jury confusion, cross-examination of a lawyer-
    adversary, and the appearance of impropriety "are absent or, at
    least, greatly reduced, when the lawyer-witness does not act as
    trial counsel, even if he performs behind-the-scenes work for
    the client in the same case."   
    Id., quoting Culebras
    Enters.
    
    Corp., 846 F.2d at 100
    .
    Relying on the plain language of rule 3.7 (a), and
    considering the context in which dual role representation has
    arisen vis-à-vis the Hinton drug lab cases, we conclude that the
    rule does not bar such representation.   The request by CPCS to
    proceed with dual role representation does not involve plea
    counsel acting as both an advocate and a necessary witness "at
    trial."   To the contrary, plea counsel will be acting in those
    capacities during a motion proceeding before a judge.    There
    will be no jury that might become "confused by the combination
    of the roles of attorney and witness."   Steinert, 73 Mass. App.
    Ct. at 291.   To the extent that plea counsel may be in the
    position of having to comment on his or her own credibility, the
    judge is amply able to make the necessary credibility
    determinations without being swayed by any improper
    considerations.   Apart from the defendant, plea counsel is
    likely the only individual who can attest to the circumstances
    surrounding the defendant's decision to plead guilty, and such
    42
    testimony is critical to the judge's decision whether to allow a
    motion to vacate a guilty plea.   See 
    Scott, 467 Mass. at 354-355
    ("the defendant must demonstrate a reasonable probability that
    he would not have pleaded guilty had he known of Dookhan's
    misconduct").   At the time of plea negotiations, neither the
    defendant nor plea counsel could have imagined the events that
    later would unfold at the Hinton drug lab, or entertained the
    thought that plea counsel would be called as a witness at a
    subsequent proceeding.   See comment [4] to rule 3.7 ("It is
    relevant that one or both parties could reasonably foresee that
    the lawyer would probably be a witness").   Given the numbers of
    Dookhan defendants and of attorneys able to represent them,
    having plea counsel continue their representation of former
    clients is a sensible approach for resolving these cases in a
    timely and efficient manner.   Plea counsel already will be
    familiar with a defendant's case and can expeditiously work
    toward bringing it to a conclusion.
    We recognized in 
    Smaland, 461 Mass. at 227
    n.20, that
    "combining the roles of advocate and witness may create a
    conflict of interest [as] governed by Mass. R. Prof. C. 1.7, 
    426 Mass. 1373
    (1998) (conflict of interest), or Mass. R. Prof. C.
    1.9, 
    426 Mass. 1342
    (1998) (prior representation)."   See comment
    [1] and [5] to rule 3.7.   The Commonwealth asserts that dual
    role representation presents a conflict of interest because the
    43
    Commonwealth likely will elicit information from counsel that is
    harmful to a defendant, particularly an admission that, apart
    from the drug certificate, the evidence against the defendant
    was strong.    See Commonwealth v. Shraiar, 
    397 Mass. 16
    , 21
    (1986) ("A genuine conflict of interest arises whenever trial
    counsel is called upon to give testimony adverse to his
    client").   Determining the existence of a conflict of interest
    is "primarily the responsibility of the lawyer involved,"
    comment [5] to rule 3.7, and is a matter for discussion with the
    client.   See Mass. R. Prof. C. 1.7 (b) (2).   A defendant may
    consent to dual role representation notwithstanding a conflict
    of interest.   See id; comment [5] to rule 1.7.   See also
    
    Perkins, 450 Mass. at 853
    .   We conclude that Mass. R. Prof. C.
    3.7 (a) does not bar dual role representation of a Dookhan
    defendant at a hearing on a motion to withdraw a guilty plea,
    although "it would be particularly prudent first to secure
    client consent after consultation."32   
    Smaland, 461 Mass. at 226
    .
    Ultimately, as acknowledged by CPCS, the decision whether to
    32
    We add that, in light of our conclusion, dual role
    representation at a Dookhan defendant's hearing on a motion to
    withdraw a guilty plea also does not run afoul of Rule 12 of the
    Rules of the Superior Court 1017 (LexisNexis 2014-2015), which
    states: "No attorney shall be permitted to take part in the
    conduct of a trial in which he has been or intends to be a
    witness for his client, except by special leave of the court"
    (emphasis added).
    44
    continue with plea counsel or request the appointment of a new
    attorney should remain in the hands of the defendant.
    7.    Scope of testimony by Dookhan defendants.   Finally,
    CPCS raises two related claims pertaining to the testimony of a
    Dookhan defendant at a hearing on a motion to withdraw a guilty
    plea.    First, CPCS contends that cross-examination of a
    defendant should not be permitted to delve into the defendant's
    guilt or innocence of the underlying crime, unless the defendant
    asserts a claim of actual innocence.   As we understand its
    argument, CPCS does not seek to preclude cross-examination
    regarding the alleged facts of a given case, acknowledging that
    the Commonwealth should be free to question the defendant about
    his or her assessment of the nature and strength of the evidence
    against the defendant.    However, CPCS wants to prevent the
    Commonwealth from turning the defendant's request for
    postconviction relief into what CPCS views as a game of
    "gotcha," where the Commonwealth's strategy is to ask the
    defendant about his or her guilt (and presumably elicit a
    response that he or she is not guilty) and then argue that the
    defendant is a liar because the defendant's testimony at the
    motion hearing contradicts his or her testimony from the plea
    colloquy.   CPCS asserts that allowing the Commonwealth to pursue
    this line of cross-examination is unfair and prejudicial.
    Therefore, it continues, this court should limit the scope of
    45
    cross-examination to questions concerning the defendant's
    knowledge about the Commonwealth's evidence at the time he or
    she pleaded guilty.   We decline to adopt CPCS's proposed
    evidentiary rule.
    As CPCS correctly points out, a Dookhan defendant at a
    hearing on a motion to withdraw a guilty plea "must demonstrate
    a reasonable probability that he would not have pleaded guilty
    had he known of Dookhan's misconduct."    
    Scott, 467 Mass. at 355
    .
    "Ultimately, a defendant's decision to tender a guilty plea is a
    unique, individualized decision, and the relevant factors and
    their relative weight will differ from one case to the next."
    
    Id. at 356.
       We have emphasized that "the full context of the
    defendant's decision to enter a plea agreement will dictate the
    assessment of his claim that knowledge of Dookhan's misconduct
    would have influenced [his] decision to plead guilty."      
    Id. at 357.
       A judge's determination whether a defendant has made the
    necessary showing will be based on "the totality of the
    circumstances."   
    Id. at 358.
    It is well established that the scope and extent of cross-
    examination is left to a judge's broad discretion.    See
    Commonwealth v. Horne, 
    466 Mass. 440
    , 447 (2013); Commonwealth
    v. Johnson, 
    431 Mass. 535
    , 538 (2000).   See also Commonwealth v.
    Gagnon, 
    408 Mass. 185
    , 192 (1990), S.C., 
    430 Mass. 348
    (1999),
    quoting Commonwealth v. Underwood, 
    358 Mass. 506
    , 513 (1970)
    46
    (judge determines extent to which "the accuracy, veracity, and
    credibility of a witness may be tested" on cross-examination).
    Consequently, whether the Commonwealth should be allowed to
    cross-examine a defendant on his or her guilt or innocence of
    the underlying crime is a matter for the motion judge to decide.
    If permitted, the judge can assess the Commonwealth's arguments
    about the defendant's truthfulness in the context of defense
    counsel's countervailing arguments about the essential reasons
    for the defendant's guilty plea.    Judges are aware that, on
    occasion, defendants have an incentive to plead guilty for
    reasons other than actual guilt, including to avoid the
    imposition of mandatory minimum sentences in the event they are
    found guilty after trial.   See Commonwealth v. Nikas, 
    431 Mass. 453
    , 455 (2000), and cases cited.
    Second, and dovetailing with the issue just discussed, CPCS
    contends that the testimony of a Dookhan defendant at a hearing
    on a motion to withdraw a guilty plea should not be admissible
    at a subsequent trial on the defendant's guilt.    In the view of
    CPCS, the Commonwealth cannot put a defendant in the position of
    having to surrender the privilege against self-incrimination in
    order to secure the allowance of the motion, and then turn
    around and use the defendant's testimony from the motion hearing
    against the defendant at trial.     If such testimony is admissible
    at trial, CPCS continues, defendants will be deterred from
    47
    seeking postconviction relief in the first place.    CPCS argues
    that, in light of Dookhan's egregious misconduct, this result
    would be inherently unfair.33
    In Simmons v. United States, 
    390 U.S. 377
    (1968), the
    United States Supreme Court considered the issue whether a
    defendant's testimony at a suppression hearing regarding his
    standing to allege a violation of his rights under the Fourth
    Amendment to the United States Constitution could be admitted
    against him at trial on the question of his guilt or innocence.
    See 
    id. at 382,
    389-390.   Given that the defendant would be
    obliged either to give up a valid Fourth Amendment claim, or
    effectively waive his Fifth Amendment privilege against self-
    incrimination, the Court found it "intolerable that one
    constitutional right should have to be surrendered in order to
    assert another."   
    Id. at 394.
      Accordingly, the Court held that
    "when a defendant testifies in support of a motion to suppress
    evidence on Fourth Amendment grounds, his testimony may not
    thereafter be admitted against him at trial on the issue of
    guilt unless he makes no objection."    
    Id. See Commonwealth
    v.
    Rivera, 
    425 Mass. 633
    , 637 (1997) (recognizing rule articulated
    in Simmons).
    33
    The Commonwealth asserts that this issue is not ripe for
    review because the harm alleged by CPCS is hypothetical. For
    the reasons already articulated, we conclude that it is
    appropriate to consider CPCS's claim now in accordance with our
    broad powers of superintendence under G. L. c. 211, § 3.
    48
    Here, although the rights asserted by a Dookhan defendant
    are somewhat different from those in Simmons, we reach a similar
    conclusion.   A defendant has a "constitutional due process right
    to a fair trial."    Commonwealth v. Henderson, 
    411 Mass. 309
    , 310
    (1991).   See 
    Scott, 467 Mass. at 352
    .    See also Strickland v.
    Washington, 
    466 U.S. 668
    , 684 (1984).      For a Dookhan defendant,
    the ability to exercise the right to a fair trial is contingent,
    in the first instance, on the allowance of a motion to withdraw
    a guilty plea.    However, the allowance of such a motion may
    depend in significant measure on the defendant's willingness to
    sacrifice the privilege against self-incrimination to enable the
    motion judge to assess the full context of the defendant's
    decision to plead guilty.    See 
    Scott, 467 Mass. at 357
    .
    Alternatively, a Dookhan defendant can sacrifice the right to a
    fair trial by asserting the Fifth Amendment privilege against
    self-incrimination at the hearing, thereby increasing the
    likelihood that his or her motion to withdraw a guilty plea will
    be denied.    Having to make this choice places the defendant in
    an untenable position.    On the one hand, the defendant is
    compelled to be a witness against himself or herself in order to
    obtain relief from egregious government misconduct that may well
    have tainted his or her conviction.      On the other hand, the
    defendant is deterred from pursuing his or her postconviction
    rights under Scott by not seeking to withdraw the guilty plea,
    49
    thereby perpetuating the injustice arising from Dookhan's
    misconduct.   The relief afforded by the allowance of a motion to
    withdraw a guilty plea would be illusory if the Commonwealth
    then could turn around and use the defendant's testimony against
    him or her at trial.    Accordingly, we conclude that the
    testimony of a Dookhan defendant at a hearing on a motion to
    withdraw a guilty plea is only admissible at a subsequent trial
    for impeachment purposes if the defendant chooses to testify.34
    See Commonwealth v. 
    Rivera, 425 Mass. at 637
    , and cases cited
    (rule articulated in 
    Simmons, 390 U.S. at 394
    , "has not been
    applied to exclude the use of prior inconsistent statements for
    impeachment purposes").
    8.   Conclusion.   For the foregoing reasons, we conclude
    that (1) a defendant who has been granted a new trial based on
    Dookhan's misconduct at the Hinton drug lab cannot be charged
    with a more serious offense than that of which he or she
    initially was convicted under the terms of a plea agreement and,
    if convicted again, cannot be given a more severe sentence than
    that which originally was imposed; (2) the motion to intervene
    filed by CPCS is allowed; (3) a so-called "global remedy" will
    not be implemented at this time; (4) a lawyer who represented a
    Dookhan defendant at the plea stage of criminal proceedings is
    34
    In accordance with Mass. R. Crim. P. 12 (f), as appearing
    in 
    442 Mass. 1511
    (2004), statements made by a Dookhan defendant
    at a plea colloquy are not admissible at a subsequent trial.
    50
    not barred by the advocate-witness rule from subsequently
    representing that defendant and testifying at an evidentiary
    hearing on the defendant's motion to withdraw a guilty plea; (5)
    the scope of cross-examination of a Dookhan defendant at a
    hearing on a motion to withdraw a guilty plea is left to the
    broad discretion of the motion judge; and (6) the testimony of a
    Dookhan defendant at a hearing on a motion to withdraw a guilty
    plea is only admissible at a subsequent trial for impeachment
    purposes if the defendant chooses to testify.    The case is
    remanded to the single justice for further proceedings,
    consistent with this opinion, as appropriate.
    So ordered.