Commonwealth v. Oppenheim , 86 Mass. App. Ct. 359 ( 2014 )


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    12-P-1673                                            Appeals Court
    COMMONWEALTH    vs.   DAVID OPPENHEIM.1
    No. 12-P-1673.
    Hampshire.       May 9, 2014. - September 24, 2014.
    Present:   Cohen, Sikora, & Agnes, JJ.
    Evidence, Admissions and confessions, Authentication,
    Credibility of witness, Cross-examination. Practice,
    Criminal, Admissions and confessions, Instructions to jury,
    Reasonable doubt. Jury and Jurors. Witness, Credibility,
    Cross-examination.
    Indictments found and returned in the Superior Court
    Department on July 13, 2010.
    The cases were tried before Mary-Lou Rup, J.
    David J. Nathanson (Dan A. Horowitz with him) for the
    defendant.
    Thomas H. Townsend, Assistant District Attorney, for the
    Commonwealth.
    SIKORA, J.   A Superior Court jury convicted the defendant,
    David Oppenheim, of five counts of rape of a child.      See G. L.
    1
    Justice Sikora participated in the deliberation on this
    case and authored the opinion prior to his retirement.
    2
    c. 265, § 23.    He appeals upon multiple grounds, but argues
    principally that the trial judge should have instructed the jury
    that, before they could consider a confession contained in an
    instant message (IM) conversation,2 the Commonwealth needed to
    prove beyond a reasonable doubt that the defendant authored the
    confession.    For the following reasons, we affirm.
    Background.    1.    Commonwealth's evidence.   From the
    Commonwealth's main witnesses, the jury heard the following
    evidence.    We reserve certain details for discussion of the
    appellate issues.       In 2002, the defendant and his wife founded a
    community theater enterprise entitled the Pioneer Arts Center of
    Easthampton (PACE or the center).      As the center's chief
    executive, the defendant directed musical theater and taught
    acting classes.
    The victim, Ann Ross,3 testified at length.      She first
    attended PACE activities in the fall of 2004 at the age of
    thirteen.    She remained actively involved at the center over the
    next four years.    She first performed volunteer and intern
    2
    Instant messaging is "a form of computer communication in
    which individuals hold an online conversation via the
    [I]nternet. . . . [The] message is transmitted instantaneously
    . . . allow[ing] both parties . . . to respond immediately."
    Commonwealth v. Disler, 
    451 Mass. 216
    , 218 n.3 (2008), quoting
    from State v. Lott, 
    152 N.H. 436
    , 437 (2005).
    3
    A pseudonym.
    3
    chores, then took acting lessons, and ultimately assumed
    significant roles in musical productions.
    In the fall of 2005, when she was fourteen years old, Ross
    accepted the defendant's offer of private acting lessons.        The
    classes usually took place in the defendant's office or the
    theater.       The defendant told Ross that, to improve her acting
    skill, she needed to experience physical sensations beyond the
    knowledge of her age group.       He rubbed her arms and kissed her
    lips, face, and neck.       He told her that she was "really
    talented," that she was "going to go far[,] and that he was
    going to make sure that that happened."       He instructed her not
    to tell anybody about their lessons because "society doesn't
    understand what I'm doing here."
    Ross testified that the sexual activity intensified over
    the next two years.       The defendant touched Ross "everywhere,"
    including her vagina; performed oral sex on her; engaged her in
    anal and vaginal sex; and directed her to perform oral sex on
    him.       Ross had no prior experience in these activities.   They
    occurred usually at the defendant's office or home, or at the
    theater.
    The Commonwealth's second principal witness was Ryan
    DiMartino.4      DiMartino had attended PACE's musical theater
    4
    At trial, in February, 2012, DiMartino testified that he
    had been born and raised as a female, but that after the events
    4
    training during the summers of 2005, 2006, and 2007, at
    fourteen, fifteen, and sixteen years of age.     During those years
    DiMartino was known as Emily and lived as a female.     In the
    course of the summers, DiMartino met, and developed an
    undisclosed romantic attraction toward, Ross.     During those
    periods DiMartino observed Ross and the defendant often alone in
    close working proximity.
    During the school year of 2007-2008, at age sixteen,
    DiMartino performed volunteer work at PACE.     On Wednesday
    afternoons and evenings DiMartino cleaned and prepared the
    theater for evening open microphone activities.     The defendant
    would admit DiMartino to the locked theater.    They began online
    chats in October.   As of the end of 2007 and the beginning of
    2008, the conversations between them became personal and then,
    according to DiMartino, "more flirtatious and sexual."
    During a Wednesday afternoon in early February of 2008, at
    the locked theater, the defendant kissed and caressed DiMartino.
    That conduct became a pattern during private Wednesday afternoon
    chores at the theater.     The defendant proposed also that they
    engage in sexual relations.
    at issue he had identified as transgender, transitioned to life
    as a man, and in October of 2010 changed his name to "Eli Ryan
    DiMartino." For consistency, we shall use his trial-time
    identity and, as necessary, employ masculine pronouns.
    5
    On February 13, the defendant suggested to DiMartino that
    he (the defendant) open a new online account with a new online
    name to mask his identity against any suspicion of DiMartino's
    parents or others about their IM traffic.    The defendant and
    DiMartino changed the defendant's IM identity to the name
    "Allie."
    On or about March 9, the defendant and DiMartino discussed,
    in person, DiMartino's attraction to Ross.    The defendant urged
    DiMartino to pursue it.   DiMartino asked the defendant whether
    any sexual activity "was happening between [Ross and him]."      The
    defendant responded that they could "talk about it another time"
    because he "wasn't sure if he trusted [DiMartino] enough to tell
    [him] everything."
    Late the following evening of March 10, the defendant
    opened an IM conversation with DiMartino about his (the
    defendant's) relationship with Ross.   In the course of the
    extended IM conversation, the defendant related in physical
    detail a first seduction of Ross at about age fourteen in the
    sound booth of the PACE theater and the accomplishment of both
    vaginal and anal penetration of her on that occasion.   The IM
    related that the defendant had maintained a pattern of sexual
    intercourse with Ross through the time of her relationship with
    one boyfriend and into the beginning of her relationship with a
    successor (college) boyfriend.
    6
    Subsequently, on a Wednesday afternoon at the PACE theater,
    the defendant told DiMartino again that he (the defendant) on
    multiple occasions had engaged in vaginal and anal sex with Ross
    in the office and in the light booth of the PACE theater
    complex.
    Carissa Dagenais was the Commonwealth's third principal
    witness.   From 2004 to late 2006, at ages fifteen to seventeen,
    she too performed volunteer work at PACE, and took an acting
    class from the defendant.   She was familiar with Ross as another
    member of the acting class.
    During her first year of college (2007-2008), Dagenais
    frequently stayed at the defendant's house because she was
    "having a hard time at home."   In the summer of 2008, she asked
    the defendant why she no longer saw Ross at PACE.    He answered
    that Ross and he had once had a "full-on sexual relationship,"
    that she "had started seeing someone else," and that they had
    not enjoyed their collaboration in their last musical
    production.
    In June of 2010, after publication of the charges against
    the defendant, he asked Dagenais to appear as a character
    witness on his behalf.   She at first agreed.   In July of 2010,
    she decided to report her information about the defendant's
    relationship with Ross to the police.   In a telephone
    conversation with the defendant, she informed him of that
    7
    intention.    He acknowledged the wrongfulness of his actions, but
    described the law and his potential punishment as unfair.      He
    told her that her testimony would ruin his and his family's
    lives.
    The Commonwealth offered the testimony of two other former
    PACE students as pattern-of-conduct evidence.    Laura Berkeley5
    began an internship in the fall of 2003 at age seventeen.      The
    defendant offered her private acting lessons and proposed the
    technique of accelerated "primitive" experiences for
    professional development.   The tutorial resulted in sexual
    activity (fellatio, cunnilingus, and digital and vaginal
    intercourse) in the PACE office area, the green room, and the
    sound booth, and at the defendant's home.     Her internship
    concluded in the spring of 2004.
    Marit Bjerkadal participated at PACE during the period of
    2003 into early 2005 at ages sixteen, seventeen, and eighteen.
    She performed volunteer chores to defray the cost of acting
    lessons for her younger sister and herself.    She testified that,
    in the winter of 2005, the defendant approached her privately,
    massaged her shoulders, and proposed payment by sexual favors.
    She became frightened and left PACE shortly afterward.
    5
    A pseudonym.
    8
    2.   Defendant's evidence.   Through the testimony of the
    defendant's wife and multiple PACE attendees, the defense
    emphasized that the defendant and his wife had shared the
    management of PACE and often worked there from early morning to
    late evening.   Their presence on site, together or separately,
    depended on the variable circumstances of productions, classes,
    maintenance, and appointments, and was generally unpredictable.
    The level of activity, the presence of volunteers on irregular
    schedules, and the accessibility of the theater to as many as
    fifteen persons with keys would preclude the degree of privacy
    and secrecy needed to carry out the patterns of conduct alleged
    by the Commonwealth.   The defendant testified.   He denied the
    accusations of sexual activity by all students.
    Analysis.   1.   Admissibility of March 10 IM confession.
    Before trial both the defendant and the Commonwealth submitted
    motions in limine addressing the admissibility of IM
    conversations between the defendant and DiMartino, particularly
    the March 10 narration of the first instance of the defendant's
    sexual intercourse with Ross.    The judge conducted an
    evidentiary hearing at which DiMartino testified to the same
    information later offered at trial concerning the March 10
    communication, including commencement of such messages in
    October of 2007, and the online name change and preliminary
    discussions of February 13 and March 9, respectively.
    9
    When the prosecutor asked DiMartino what evidence convinced
    him that the defendant had authored the March 10 IM, DiMartino
    answered that "the tone and language was [what] I was used to
    having with [the defendant], the way we would talk in the [PACE]
    cafe."   DiMartino added that the IM referred to prior in-person
    conversations between the two, including discussions about
    DiMartino's boyfriend, his mother's anger about his late-night
    presence at the defendant's house, and the defendant's sexual
    relationship with his wife.6
    Defense counsel asked the judge to exclude the IM
    conversations in their entirety for lack of proof of their
    authenticity, especially because the Commonwealth had not
    conducted a forensic examination of DiMartino's computer.    The
    judge concluded that sufficient evidence "allow[ed] a reasonable
    jury to find by a reasonable preponderance of the evidence that
    the defendant is the author of the language attributed to him"
    in the IM conversations.   She allowed the Commonwealth's motion
    6
    On cross-examination, DiMartino acknowledged that other
    people worked in the defendant's office. DiMartino conceded
    that no one had examined his computer, that he "suppose[d]"
    hacking into a person's instant messenger account "can be done
    relatively easily," and that "[i]t's possible" that "even if you
    don't hack into someone's account, it's very easy to download
    the [IM] communication and just change the words around."
    DiMartino admitted also that he did not produce all of his IM
    communications with the defendant when he first spoke to the
    police.
    10
    to admit them, and denied the defendant's motion to exclude
    them.
    At trial, defense counsel objected to the admissibility of
    the IM conversations again for lack of authentication.    The
    judge again rejected the argument:
    "I'm satisfied, based on the earlier testimony from
    [DiMartino], as well as today's testimony, that there is
    sufficient . . . evidence corroborating the fact that this
    is a conversation between [DiMartino] and the defendant to
    make it admissible. Issues as to whether or not there
    could have been someone else who was typing this in and
    responding go to the weight and not the admissibility.
    "As before, I refer to, I believe, it's the Purdy decision
    [Commonwealth v. Purdy, 
    459 Mass. 442
    (2011)], as setting
    forth the foundation that needs to be made before this type
    of electronic conversation can be admitted."
    She informed the parties that she intended to instruct the
    jury that, before they could consider an IM conversation between
    the defendant and DiMartino, they must be satisfied by a
    preponderance of the evidence that "it was the defendant who
    [was] on the other side of this conversation."    That formulation
    followed the language of Commonwealth v. 
    Purdy, 459 Mass. at 447
    .    Accord Mass. G. Evid. § 901(b)(11) (2014).   She rejected
    defense counsel's position that "since it's a statement of the
    defendant, [the jury] should have to be persuaded beyond a
    reasonable doubt that it's the defendant."    Before the offer in
    evidence of DiMartino's description of the March 10 IM
    confession, she instructed the jury to find, by a preponderance
    11
    of the evidence, the defendant to be the author of the IM
    confession before they considered its contents.7   DiMartino read
    aloud portions of both the February 13 (name change) and March
    10 (first encounter) IMs; the Commonwealth introduced the text
    of both in evidence.
    At the conclusion of all the evidence, defense counsel
    repeated the request for an instruction requiring the jury to be
    satisfied beyond a reasonable doubt of the defendant's
    authorship of the IMs.8   The judge denied the request.   She
    7
    "Please understand that before you can consider these
    conversations at all, you must first be persuaded that the
    person on the other side of this conversation is, in fact, the
    defendant. The prosecution has to prove that to what's called a
    preponderance of the evidence, which means that the evidence
    must convince you that it's more likely true than not that the
    person on the other end of this conversation, the person who is
    authoring the other side of the conversation was, in fact, the
    defendant. If you're not convinced that the person on the other
    end of the conversation -- if you're not convinced that it's
    more likely true than not that the other person on the
    conversation was, in fact, the defendant, then you may not
    consider this conversation at all against the defendant. So you
    have to make that preliminary decision as to whether or not the
    evidence proves it's more likely true than not that the
    defendant is the person at the other [end] of this conversation
    before you may consider any of this conversation at all against
    the defendant. And in making that decision, you may consider
    all of the circumstances about which you will hear evidence
    regarding the time of the conversation and other information as
    well."
    8
    "You have heard testimony that certain electronic messages
    were sent by the defendant. Before you may even consider these
    messages as evidence, you must be satisfied beyond a reasonable
    doubt that the defendant actually created and transmitted these
    messages. If you do not find that these messages were created
    12
    instructed the jury that they could consider an IM conversation
    if "convince[d]" that the defendant "was the author of those
    portions of the conversation . . . attributed to him . . . .       If
    the evidence does not persuade you that [the defendant] was the
    author of those statements, you must disregard the instant
    message conversation in your deliberations."
    On appeal the defendant pursues the contention that the IM
    confession of March 10 requires a finding of authorship beyond a
    reasonable doubt (1) because confessions carry potent probative
    force, and (2) because online communications carry a
    susceptibility to impersonation or fabrication, especially in
    the absence of forensic confirmation.    For several reasons we
    decline to extend the standard of proof beyond a reasonable
    doubt to the admissibility of online admissions and to the
    jury's acceptance of their authorship.
    a.   Preliminary facts.   It is axiomatic that the
    prosecution must establish each prima facie element of a crime
    by proof beyond a reasonable doubt.     However, the "prevailing
    general rule" in the Commonwealth is that the preponderance of
    the evidence standard applies to resolve "preliminary facts
    bearing on conditional or logical relevance."     Commonwealth v.
    Bright, 
    463 Mass. 421
    , 428, 432 (2012).     See Commonwealth v.
    by the defendant, you should disregard the messages and any
    testimony about them."
    13
    Rosenthal, 
    432 Mass. 124
    , 127 n.4 (2000) ("Although the
    Commonwealth must, of course, prove all essential elements of
    the crime beyond a reasonable doubt . . ., preliminary questions
    of fact need only be proved by a preponderance of the
    evidence"); Commonwealth v. Toon, 
    55 Mass. App. Ct. 642
    , 655
    n.18 (2002) ("The Commonwealth need not prove each subsidiary
    fact beyond a reasonable doubt before an inference is permitted
    as to an essential element of the offense. . . .   Only the
    elements of the offense need be proven beyond a reasonable
    doubt").   See also United States v. Holmquist, 
    36 F.3d 154
    , 168
    (1st Cir. 1994) (rejecting argument that proponent must
    establish authentication beyond a reasonable doubt).    Although
    we recognize that the "stronger the link between preliminary and
    ultimate factfinding, the greater the danger that error in the
    former will distort the reliability of the latter," Saltzburg,
    Standards of Proof and Preliminary Questions of Fact, 27 Stan.
    L. Rev. 271, 283 (1975), we are not persuaded to require proof
    beyond a reasonable doubt of the preliminary fact of authorship
    of electronically transmitted confessions.   Several
    considerations lead to that conclusion.
    First, as a matter of authority, the Supreme Judicial Court
    has concluded that, before admitting an electronic communication
    in evidence, a judge must determine whether sufficient evidence
    exists "for a reasonable jury to find by a preponderance of the
    14
    evidence that the defendant authored" the communication.
    Commonwealth v. 
    Purdy, 459 Mass. at 447
    .    See Mass. G. Evid.
    § 901(b)(11) & Note (2014).    Care & Protection of Laura, 
    414 Mass. 788
    , 792 (1993) ("Thus, in criminal cases, the heightened
    burden of proof is not applied to subsidiary facts, but rather
    only to the elements of the crime charged").    We agree with the
    trial judge's conclusion that Purdy strongly indicates that the
    preponderance of the evidence standard governed the jury's
    determination whether the defendant authored the IM confession.
    As argued by the Commonwealth in its brief, "It makes no sense
    for a judge to ask herself whether a jury could find by a
    preponderance of the evidence that the defendant sent the IMs
    only later to instruct the jurors that they must [make this
    finding] beyond a reasonable doubt."   See Commonwealth v.
    
    Bright, supra
    (rejecting proposed rule that "would result in the
    judge and jury each applying a different standard in determining
    whether to admit the out-of-court statements of coventurers").
    Furthermore, the preponderance of evidence standard applies
    to the admissibility and jury's consideration of facts even
    highly probative of guilt.    The United States Supreme Court has
    held that a "guilty verdict is not rendered less reliable or
    less consonant with [the standard of proof beyond a reasonable
    doubt] simply because the admissibility of a confession is
    determined by a less stringent standard."    Lego v. Twomey, 404
    
    15 U.S. 477
    , 487 (1972).    See Bourjaily v. United States, 
    483 U.S. 171
    , 175 (1987) (admissibility of evidence may hinge on
    preliminary factual questions resolved by proof by reasonable
    preponderance).   See also Commonwealth v. Azar, 32 Mass. App.
    Ct. 290, 292, 298-302 (1992), S.C., 
    435 Mass. 675
    (2002), in
    which the jury convicted the defendant of murder in the second
    degree upon evidence that included his prior bad acts of
    battering the victim.    On direct appeal, Azar argued that the
    trial judge wrongly failed "to instruct the jury that prior bad
    acts of the defendant . . . had to be proved beyond a reasonable
    doubt."   
    Id. at 309.
      Despite the inculpatory force of prior bad
    acts, we rejected the proposed necessity of their proof beyond a
    reasonable doubt.   Ibid.9
    b.    Confirming circumstances.   In Commonwealth v. Purdy,
    supra at 449, the court approved of a reasonable preponderance
    standard of admissibility of electronic communications because
    9
    The defendant cites Commonwealth v. Tucker, 
    189 Mass. 457
    (1905), in support of a requirement that a jury find authorship
    of an inculpatory communication beyond a reasonable doubt. In
    that instance the Commonwealth introduced handwritten sales
    slips to show that the defendant had authored a separate
    document. 
    Id. at 470.
    The judge instructed the jury that
    "unless the Commonwealth shows by . . . proof beyond a
    reasonable doubt, that the writing upon these slips was actually
    made by the defendant, . . . the jury should wholly disregard
    them and all the great body of evidence which they have heard
    about them." 
    Id. at 473.
    The Supreme Judicial Court disposed
    of the appeal on other grounds; it did not reason or hold that
    the Commonwealth must prove authorship beyond a reasonable
    doubt. 
    Id. at 475.
                                                                       16
    "confirming circumstances" beyond the sender's self-
    identification tended to corroborate the authenticity of the
    message from the apparent author.    DiMartino provided such
    circumstances for the March 10 IM.    They included the familiar
    tone of the exchange, the sender's references to prior
    discussions with DiMartino about DiMartino's boyfriend's height,
    DiMartino's mother's anger, the height and personal habits of
    the sender's wife, the sender's recent decision to shave his
    beard, the location of DiMartino's bedroom window at home, the
    sender's approaching appointment with a client in South
    Deerfield, and mention of the sender's son.    DiMartino knew of
    these elements and could have manufactured their appearance in
    the prolonged IM conversation over its intermittent span of
    almost four hours.   However, that effort would have been
    elaborate and generally inexplicable.
    c.   Humane practice analogy.    We have weighed the analogy
    proposed by the defendant to the Massachusetts humane practice
    rule.   That instruction directs a jury to disregard
    incriminating statements attributed to a defendant unless the
    Commonwealth proves beyond a reasonable doubt that the defendant
    made the statements voluntarily.    See Commonwealth v. Tavares,
    
    385 Mass. 140
    , 149-150, cert. denied, 
    457 U.S. 1137
    (1982);
    Commonwealth v. Watkins, 
    425 Mass. 830
    , 834-835 (1997).     The
    defendant correctly notes that the "usual terms" of the
    17
    instruction forbid jurors to consider incriminating statements
    unless persuaded "beyond a reasonable doubt, after considering
    all the evidence, that the defendant had made the statements and
    that they were voluntary as a 'product of his own free will and
    his rational intellect'" (emphasis supplied).     Commonwealth v.
    Almonte, 
    444 Mass. 511
    , 522 (2005).     See Commonwealth v.
    Watkins, supra at 835.10
    However, the humane practice rule "responds to two specific
    concerns" not present here.     Commonwealth v. 
    Bright, 463 Mass. at 433
    .     One is the inducement of an admission or confession "by
    trained interrogators wielding the authority of the State."
    
    Ibid. The rule stands
    guard against the powerful evidentiary
    effect of any guile, pressure, or coercion employed by
    governmental interrogation.     The second is the constitutional
    policy of art. 12 of the Massachusetts Declaration of Rights
    prohibiting the compulsion of an accused to "furnish evidence
    against himself."     Commonwealth v. Hoyt, 
    461 Mass. 143
    , 152 n.11
    (2011), quoting from art. 12 of the Massachusetts Declaration of
    Rights..    In this case, the IMs at issue passed between two
    private individuals engaged in voluntary communication.       Both
    the letter and the purpose of the humane practice rule appear
    inapplicable.     We see no inclination of the court in the Purdy
    10
    For an excellent synopsis of the rule, see Brodin &
    Avery, Massachusetts Evidence § 12.1, at 644-647 (8th ed. 2007).
    18
    or the Bright decisions to extend an elevated standard of proof
    for admissibility and ultimate fact finding to general
    electronic messaging between private communicants in voluntary
    circumstances.
    Finally, we conclude that the judge correctly conveyed the
    standard of reasonable preponderance to the jury in her final
    charge.   During DiMartino's testimony, she properly instructed
    the jury that "the evidence must convince you that it's more
    likely true than not" that the defendant authored the IMs
    attributed to him.   Although the final charge instructed the
    jury to be "convince[d]" or "persuade[d]" by the evidence, we
    are satisfied that, after receipt of the contemporaneous and
    final instructions, the jury understood the duty to find it
    "more likely true than not" that the defendant authored the IM
    confession before they could consider it.   See, e.g.,
    Commonwealth v. Cryer, 
    426 Mass. 562
    , 572 (1998) ("In
    determining the propriety of a jury instruction, we must
    consider the instruction in the context in which it was
    delivered, in order to determine its probable effect on the
    jury's understanding of their function").   In particular, the
    use of the word "convince[d]," if anything, connotes a
    requirement greater than a mere reasonable preponderance.
    In sum, in response to an objection to the authenticity or
    authorship of a self-inculpatory electronic message, the judge
    19
    will determine its admissibility and the jury its credibility by
    a reasonable preponderance of the evidence.    Counsel will be
    able to contest both issues by argument regarding the presence
    or the absence of confirming circumstances.
    2.   Witness character evidence.   The defendant argues that
    the prosecutor improperly elicited testimony of the "good
    character and good works" of multiple prosecution witnesses,
    including Ross, DiMartino, Dagenais, Berkeley, and Bjerkadal;
    and that in closing comments the prosecutor improperly exploited
    that testimony "to bolster the credibility" of those witnesses.
    The prosecutor did call for testimony of those witnesses'
    educational achievements, professional aspirations, and
    extracurricular activities.   In particular she established that
    each of them had gone forward to serious college programs in the
    arts or other disciplines.
    As a general rule, "evidence of a person's character is not
    admissible to prove that he acted in conformity with that
    character on a particular occasion."     Commonwealth v. Bonds, 
    445 Mass. 821
    , 829 (2006), quoting from Liacos, Brodin, & Avery,
    Massachusetts Evidence § 4.4.1, at 130 (7th ed. 1999).     See
    Mass. G. Evid. § 404(b) & Note (2014).     In this instance the
    defendant did not object to the introduction of the credentials
    of the enumerated prosecution witnesses.    Consequently we
    inspect the issue for the presence of error and a resulting
    20
    substantial risk of a miscarriage of justice; we assess the
    evidence as a whole, and consider (i) the strength of the
    Commonwealth's case, (ii) the precise nature of the claimed
    error, (iii) the significance of the error, and (iv) the
    possibility that the omission of objection resulted from a
    reasonable tactical decision.   Commonwealth v. 
    Azar, 435 Mass. at 687
    .   Under those criteria, relief is rare.   See, e.g.,
    Commonwealth v. Randolph, 
    438 Mass. 290
    , 297-298 (2002).
    Here, if we assume without deciding that some excessive
    credentialing reached the jury, it would not approach the level
    of the requisite substantial risk.    First, the strength of the
    Commonwealth's case was considerable.    Five percipient witnesses
    testified to a pattern of conduct.    The jury assessed each
    witness's credibility and the credibility of the defendant, all
    under direct and cross-examination.     The jury received evidence
    of an electronic confession and testimony of four other oral
    admissions from DiMartino and Dagenais.    The significance of
    incremental biographical data was not appreciable amid the total
    evidence.
    Second, defense counsel made tactical use of DiMartino's
    crowded curricular and extracurricular agenda during involvement
    with PACE.   Defense counsel cross-examined him vigorously to
    propose that these augmented activities and certain personal and
    21
    family matters kept DiMartino occupied, stressed, and removed
    from events at the center.
    The prosecutor's references to the subsequent
    accomplishments of the witnesses in closing argument did not
    constitute error, and certainly not error creating a substantial
    risk.     The rule is that a "prosecutor may make a fair response
    to an attack on the credibility of a government witness."
    Commonwealth v. Chavis, 
    415 Mass. 703
    , 713 (1993), citing
    Commonwealth v. Simmons, 
    20 Mass. App. Ct. 366
    , 371 (1985).     See
    Commonwealth v. Smith, 
    404 Mass. 1
    , 7 (1989).     In his
    immediately preceding summation, defense counsel had
    characterized the prosecution's main witnesses as untrustworthy
    "actresses."11    The prosecutor was entitled to cite their
    achievements as a responsive indication of their reliability.
    3.    Cross-examination of DiMartino.   Because the prosecutor
    elicited favorable background information from DiMartino, the
    judge permitted defense counsel "some leeway" for impeachment of
    11
    He argued:
    "Let's never lose sight of the fact, ladies and
    gentlemen, that all of these people that testified in this
    case, they're all little actresses, they're all into the
    drama. And, when you have a place like PACE that accepts
    everyone, that's open to everyone, you're going to draw
    people with baggage. You're going to draw people like Ryan
    DiMartino and Carissa Dagenais. People who I suggest to
    you are unstable people. We don't screen people when they
    come to PACE. They accepted pretty much everyone. You're
    going to attract people like Laura [Berkeley]."
    22
    his character.   Defense counsel proposed a range of subjects.
    The judge allowed all but two:   DiMartino's involvement in self-
    mutilation (cutting) and bondage.   The judge did not consider
    self-mutilation to be relevant, and feared that testimony about
    bondage would "inflame the jury."   Defense counsel objected to
    the restriction; we therefore review the issue for prejudicial
    error.   See Commonwealth v. Flebotte, 
    417 Mass. 348
    , 353 (1994).
    "The established rule is that an appellate court will not
    overrule a trial judge's determination as to the proper scope of
    cross-examination unless the defendant shows a clear abuse of
    discretion and prejudice."   Commonwealth v. Crouse, 
    447 Mass. 558
    , 572 (2006).   See Mass. G. Evid. § 611(b)(1) & Note (2014).
    Here the judge permitted defense counsel to question DiMartino
    about multiple sensitive topics, including struggles with gender
    identity and change, the deaths of family members, depression
    and medication, and multiple sexual preferences and practices.
    The judge reasonably could draw a line short of questions
    regarding self-mutilation and bondage upon the ground that
    prejudicial impact then overrode probative value.   That
    limitation did not abuse discretion or create any error.    Any
    putative error would have had little or no effect on the
    23
    verdicts.    See Commonwealth v. Flebotte, supra; Commonwealth v.
    Graham, 
    431 Mass. 282
    , 288 (2000).12
    4.     Empanelment of students.   General Laws c. 234A, § 3,
    inserted by St. 1982, c. 298, § 1, provides that "[n]o person
    shall be exempted or excluded from serving as a grand or trial
    juror because of . . . occupation."     In Commonwealth v. Brown,
    
    449 Mass. 747
    , 772 (2007), the court interpreted the statute to
    mean that "[s]tudents are not to be excused simply by virtue of
    their occupation.    As with any other hardship excuse[s], those
    for students must be based on an individualized finding and not
    a blanket rule."    On appeal the defendant contends that the
    judge "systematically excused" students and as a result created
    a substantial risk of a miscarriage of justice because college-
    age jurors more likely would understand the susceptibility of
    instant messaging to falsification.
    Jury selection began on January 23, 2012, and consumed
    almost five days.    The judge informed each day's venire that the
    trial would extend into early February.     On each morning she
    advised the venire generally that "this county [Hampshire] [has]
    12
    We have considered the defendant's remaining evidentiary
    arguments (1) that the judge wrongly excluded testimony about a
    Web log (blog) post from Dagenais undermining her credibility,
    and (2) that the judge wrongly permitted cross-examination of
    the defendant about an electronic mail (e-mail) photograph
    belatedly disclosed by the Commonwealth. Neither ruling
    constituted error causing prejudicial harm to the defendant.
    24
    a large number of students," and that "if you're a full-time
    student and you feel it would be a real hardship for you to miss
    that many classes, you should bring that to my attention,
    because that could certainly be grounds for excusing you."     This
    phrasing remained consistent for each venire.13
    Over the five-day empanelment the judge excused a total of
    nineteen students for hardship, seventeen college students and
    two high school students.    Defense counsel did not object to any
    of the excusals.    The judge seated one student as a juror.
    ("I'm a student but I think I can handle the hardship.")
    The assertion of improper systematic exclusion for
    occupation fails upon two independent grounds.    First, G. L.
    c. 234A, § 74, inserted by St. 1982, c. 298, § 1, requires
    prompt objection by a party to any "irregularity or defect" in
    the empanelment process.14    "Under [that provision], a defect in
    jury empanelment does not warrant reversal unless a defendant
    13
    Hampshire County contains Amherst College, Hampshire
    College, Mount Holyoke College, Smith College, and the
    University of Massachusetts at Amherst.
    14
    In relevant part, the statute reads:
    "Any irregularity in . . . selecting, . . . excusing, . . .
    [or] impanelling . . . jurors; . . . or any defect in any
    procedure performed under this chapter shall not be
    sufficient . . . to set aside a verdict unless objection to
    such irregularity or defect has been made as soon as
    possible after its discovery or after it should have been
    discovered and unless the objecting party has been
    specially injured or prejudiced thereby."
    25
    objects to it 'as soon as possible after its discovery or after
    it should have been discovered and unless [he] has been
    specially injured or prejudiced thereby.'"     Commonwealth v.
    Vuthy Seng, 
    456 Mass. 490
    , 495 (2010), quoting from G. L.
    c. 234A, § 74.    See Commonwealth v. Mora, 
    82 Mass. App. Ct. 575
    ,
    578-579 (2012).   The defendant did not object to the excusal of
    any student and has not substantiated any prejudice beyond the
    general hypothesis of his loss of the students' special online
    savvy.
    If timely objection had preserved the merits, the record
    would not show a violation of G. L. c. 234A, § 3.     The judge did
    not confer a categorical exemption on students.    She instead
    identified full-time student status as an available, but not
    automatic, ground of hardship and excusal.     The initiative
    remained with the student.   Of the nineteen excusals, fifteen
    students brought their hardship status to the judge's attention
    by raising their juror identification cards.     The judge's
    respect for their requests was reasonable.     The defendant has
    not argued that a one-to-two-week absence from classes would not
    qualify as a hardship.
    Judgments affirmed.