¶1After a jury trial in the Juvenile Court, the juvenile was adjudicated delinquent on a complaint charging him with burning a building.
¶2Evidence at trial revealed the following. Sometime between 7:00 p.m. and 8:30 p.m., on June 9, 2008, the juvenile and Karen Smith
¶3When Smith got to the exterior corner of the factory, she called for the juvenile. He came out and urged her “just to go.” They walked away together and headed toward Sargeant Street. When Smith looked back about ten minutes later, she saw smoke *329coming from the first-floor windows that were about six to ten windows away from where they had just been.
¶4After parting company with Smith, the juvenile met a friend, one Bill Jones,
¶5Trooper Michael Mazza, a twenty-year veteran of the fire and explosion investigation section of the State police, was also summoned to the scene. Mazza’s investigation included canvassing the neighborhood, talking to the fire fighters who arrived first to the fire, and examining the building and the fire progression.
¶6The juvenile claimed that the police were under tremendous pressure to find the culprit who started the fire because it occurred on the heels of thirty-one other suspicious fires in Holyoke that remained unsolved. Because of that pressure, the defense claimed, the police induced two youngsters to inculpate falsely the juvenile. The defense called three witnesses, each of whom outlined the initial contact police had with the juvenile at the scene where the police purportedly placed the juvenile, alone, into a vehicle for questioning, letting him go only after both his parents arrived at the vehicle and argued for their son’s release.
¶7Discussion. 1. Expert testimony. The juvenile argues that the judge abused her discretion in permitting Mazza to give his opinion, over the juvenile’s objections, to the origin and cause of the fire. In support of this claim, the juvenile relies solely on the judge’s denial of the prosecutor’s request on the second day of trial to amend its witness list so that Mazza, who was already included on that list, would be designated an expert witness.
¶8We discern no error in the admission of this evidence. See Commonwealth v. Hamilton, 426 Mass. 67, 70 (1997) (exclusion of evidence not warranted without a showing of prejudice when the late disclosure was not the result of bad faith on the part of the prosecutor). There was no basis upon which to exclude this testimony merely because the prosecutor had omitted the “expert” designation from the witness list. The defense had twice had the opportunity to hear and cross-examine Mazza at *331the pretrial hearings. In addition, the defense had timely been given a copy of his report which set out his opinion.
¶9Moreover, we think the record supports a “prior determination” by the judge that she found Mazza’s experience qualified him to render the opinion that the fire was intentionally set by an open flame coming in contact with the combustible material in the abandoned factory.
¶10Nor do we think the judge erred in omitting a specific instruction regarding the weight to be given an expert’s testimony, when none was requested. The judge properly instructed the jury to “determine which witnesses to believe and how much weight to give their testimony.” Commonwealth v. Dancy, 75 Mass. App. Ct. 175, 186 n.8 (2009).
¶112. Prior bad act evidence. Next, the juvenile claims that the judge should not have allowed the Commonwealth’s motion in limine to admit evidence connecting the juvenile to other fires in Holyoke. After determining that the evidence showed a modus operandi and evinced a special mark or distinctiveness, the judge found that the juvenile’s nickname spray painted near the sites of prior fires constituted a “pattern of conduct” and, therefore, was admissible. As a result, Trooper Percy testified at trial, without objection, that between March, 2008, and June, 2008, he investigated several other fires in Holyoke where he had observed the name Nano
¶12Where, as here, the juvenile denies committing the charged offense, prior misconduct may be offered to prove the identity of the person who committed the crime or to show a pattern of conduct, provided that the prior bad acts and the circumstances of the crime charged “have such similarities as to be meaningfully distinctive.” Commonwealth v. Montez, 450 Mass. 736, 744 (2008), quoting from Commonwealth v. Brusgulis, 406 Mass. 501, 505 (1990). See Mass. G. Evid. § 404(b). “There must be a uniqueness of technique, a distinctiveness, or a particularly distinguishing pattern of conduct common to the current and former incidents to warrant the admission of evidence of prior bad acts as tending to prove that the juvenile was the person who committed the crime charged” (emphasis added). Commonwealth v. Brusgulis, supra at 506. “It is not enough that there is some ‘general, although less than unique or distinct, similarity between the incidents.’ ” Commonwealth v. Kater, 432 Mass. 404, 414 (2000), quoting from Commonwealth v. Jackson, 417 Mass. 830, 836 (1994). Although there was no evidence that the purportedly unique mark of “Nano” was placed at or near the current fire,
¶13The juvenile argues that the error was exacerbated by the failure of the judge to instruct the jury regarding the limited use of this prior bad conduct evidence, although the juvenile made no request for such an instruction.
¶14This conclusion is not altered by the judge’s omission of a jury instruction limiting its use. Where, as here, the juvenile did not request such an instruction, the judge is not required to give a limiting instruction. See Commonwealth v. Delong, 60 Mass. App. Ct. 122, 131 (2003); Mass. G. Evid. § 105. Compare Commonwealth v. Mills, 47 Mass. App. Ct. 500, 506 (1999). Its omission may have assisted the defense to the extent the jury were not reminded of the tagging evidence. Contrast Commonwealth v. Baker, 440 Mass. 519, 531 (2003). In any event, we are confident that in this regard it has not been made to appear that there has been a substantial risk of a miscarriage of justice.
¶15*3343. Omission of instruction on assessment of testimony given pursuant to agreement. The juvenile argues that because Smith testified under a written agreement with the prosecutor promising not to charge her, the judge should have given a “so-called” Ciampainstruction, sua sponte, specifically mentioning that “particular care” must be taken in evaluating her credibility. See Commonwealth v. Ciampa, 406 Mass at 266. See also Mass. G. Evid. § 1104. Even if we were to conclude the agreement at issue was of the type requiring a Ciampainstruction, its omission would not have created a substantial risk of a miscarriage of justice.
¶16The judge in this case gave detailed instructions on how to assess a witness’s credibility, including the admonition to consider a witness’s “motive for testifying, . . . whether the [witness] displays any bias in testifying, or whether or not he or she has any interest in the outcome of the case.” Commonwealth v. Smiley, 431 Mass. 477, 486 (2000).
¶17These instructions were adequate, particularly in light of the fact that defense counsel vigorously cross-examined Smith, and strenuously argued to the jury that she should not be believed because she was getting a “free pass” on her own wrongdoing. In addition, a review of the prosecutor’s closing argument shows that she did not cross the line drawn by the court in Ciampa, namely, she neither explicitly nor implicitly vouched to the jury that she knew that Smith’s testimony was true because of their agreement. See Commonwealth v. Rivera, 430 Mass. 91, 96 (1999). Rather, the prosecutor merely suggested that Smith was credible, most notably because she had provided her inculpatory account to police before she met the prosecutor and signed the agreement. See Commonwealth v. Ciampa, 406 Mass. at 265; Commonwealth v. Marrero, 436 Mass. 488, 501 (2002).
¶18Accordingly, any error in the omission of the instruction that the Commonwealth could not and did not know if Smith’s testimony was true did not create a substantial risk of a miscarriage of justice.
¶194. Closing argument. Contrary to the juvenile’s claim, the prosecutor’s argument — that Smith left the building because she “knew” something was going to happen and that Smith saw the juvenile light “papers” on fire, rather than a “paper” —■ did *335not exceed the scope of the inferences that could be fairly drawn from the properly admitted evidence.
¶205. Cumulative errors. Finally, we find no error, cumulative or otherwise, sufficient to warrant reversal of the juvenile’s adjudication of delinquency. Contrast Commonwealth v. Cancel, 394 Mass. 567, 576 (1985).
¶21Adjudication of delinquency affirmed.
¶22The juvenile was also charged with breaking and entering in the nighttime with the intent to commit a felony. The record is silent as to the resolution of this offense. The judge apparently turned off the microphone at every sidebar conference, including the one that occurred at the conclusion of the Commonwealth’s case.
¶23The practice of conducting conferences not on the record is disfavored. See Commonwealth v. Mercado, 452 Mass. 662, 669 n.11 (2008), citing Commonwealth v. Fanelli, 412 Mass. 497, 501 (1992) (“we emphasize again the importance of recording all conferences”). See also Commonwealth v. Adams, 34 Mass. App. Ct. 516, 517 n.3 (1993).
¶24A pseudonym; Smith is a minor.
¶25Smith acknowledged that she had signed a cooperation agreement with the prosecution under which she would not be charged with any offense related to this incident in exchange for her truthful testimony. The agreement was admitted in evidence.
¶26A pseudonym; Jones is a minor.
¶27A motion to suppress the juvenile’s statements was “allowed in part.” No statement by the juvenile to police during this initial contact was offered or admitted in evidence.
¶28Mazza gave an opinion, over objection, that the fire started on the first floor on the Sargeant Street side of the building. Mazza also gave an opinion, over objection, that the fire had been intentionally set, rather than having been the result of an accident. Finally, Mazza explained that in his opinion the fire was caused by “an open flame [that] was introduced to the available combustible materials strewn throughout the first floor.”
¶29Mazza had already testified as an expert and had been cross-examined at two previous hearings in this case (namely, a dangerousness hearing and a motion to dismiss), and in addition, his report had been timely disclosed in advance of trial to the defense. The only discovery outstanding was the witness’s curriculum vitae, which the prosecution was in the process of providing to the defense.
¶30Among the sanctions permitted for noncompliance with Mass.R.Crim.P. 14(a)(l)(A)(vi) is the exclusion of otherwise admissible evidence. See Mass. R.Crim.P. 14(c)(2), as amended, 444 Mass. 1501 (2005).
¶31The juvenile acknowledges on appeal that Mazza had the training and experience to qualify him as an expert witness.
¶32As previously mentioned, the juvenile was known to have the nickname, Nano.
¶33Percy identified six fires where the juvenile’s nickname was observed: (1) a garage that was the site of a small fire with the name “Nano” spray painted on it; (2) a fire at a building on Hamilton Street, near the juvenile’s residence, that had “Nano” written on it; (3) & (4) a “couple of dumpster fires in close proximity to the Hamilton Street fire”; (5) a second garage that was the scene of a fire with the name “Nano” spray painted on the side of the building; and (6) that “Nano” was written near the scene of a fire at a third garage and small trailer.
¶34Although the prosecutor had indicated during the pretrial hearing that “there was also tagging of the name Nano across the street from the current fire,” that evidence was not adduced at trial.
¶35We also are cognizant of the fact that Jones made clear that the name “Nano” not only appeared near fires, but that “Nano” was spray painted “[ejverywhere” in their neighborhood, including on floors, buildings, and trucks. However, there was no testimony that the defendant himself was responsible for the Nano tags.
¶36At the conclusion of the motion in limine, the judge indicated she would *333give such an instruction, but apparently forgot to do so, and the juvenile did not object to the omission.