Fecteau, J.
The defendant appeals from convictions of distribution of heroin (three counts) and distribution of heroin in a school zone (three counts) following a jury trial in the Superior Court. He raises three issues on appeal: that the judge erred in [751]*751admitting evidence of an alias; that the judge erred in permitting an officer to testify that he had previously met the defendant at the house of correction; and that admitting a drug laboratory’s certificates of analysis violated his right, pursuant to the Sixth Amendment to the United States Constitution, to confront witnesses. We affirm.
Background. In January and February, 2004, Detective Billie Jean Kanavich of the Boston University police department drug control unit was a part of an undercover drug operation at 850 Harrison Avenue in Boston. She posed as a person seeking drugs and conducted four transactions with the defendant while two other officers, including Boston University police Officer William Donnellan, conducted surveillance.
All four transactions began in a similar manner with Detective Kanavich standing either in the plaza at 850 Harrison Avenue (on January 22 and February 2, 2004) or in the lobbies of 850 (February 18, 2004) or 840 Harrison Avenue (February 19, 2004), attempting to make contact with drug dealers and engaging with a tall black male, whom she identified in court as the defendant, Terry Reeder. On each occasion, learning that she wanted heroin, the defendant indicated that he knew someone in the area who sold heroin and asked her how much she wanted. On three occasions, Detective Kanavich responded that she wanted a twenty-dollar bag (she asked for two twenty-dollar bags on February 2), and the defendant told her to walk with him along Massachusetts Avenue toward Shawmut Avenue. On the first two occasions, they stopped in front of a convenience store on the comer of Massachusetts Avenue and Shawmut Avenue, and on the latter two, they stopped at 616 Massachusetts Avenue. The defendant would then ask Detective Kanavich for the money. On two occasions, January 22, and February 18, she saw the defendant meet with a woman and make an exchange.1 On February 2, 2004, Detective Kanavich did not see the woman; when she gave Reeder the money, he left her field of vision and later returned with two packets of folded lottery paper. On February 18, the defendant walked up Massachusetts Avenue toward Shawmut, [752]*752and was out of sight for a time; he returned with a woman and Detective Kanavich saw “hand to hand movements between the two of them.”
On each of the four occasions, Reeder then returned and handed the folded lottery paper (twice in a napkin) to Detective Kanavich, who then left the area and met with her surveillance team, which included Officer Donnellan. After the first transaction on January 22, Officer Donnellan told Detective Kanavich that he recognized the black male subject as Terry Reeder, whom he had met during the officer’s prior employment as a deputy sheriff at the Suffolk County house of correction, and that he knew him both by name and by sight.2
After each transaction, Detective Kanavich then returned to the station, opened the lottery paper, and noted that it contained a light brown powdery substance which she bagged and placed in an evidence locker. This evidence was later transmitted to the laboratory and certified as heroin.
Discussion. 1. Alias. The defendant contends that repeated reference to his alias constituted prejudicial error. We disagree. The name of the defendant, as originally listed on the indictments, was Terrence Young. Prior to trial, the defendant filed a motion to “correct” the indictments to reflect the defendant’s “true name” of Terry Reeder, and for an order that the Commonwealth not refer to the defendant as Terrence Young or any other alias. The judge allowed the motion without objection from the Commonwealth. When discussing the first two drug transactions, Detective Kanavich twice referred to the defendant as “Mr. Young” without objection. The Commonwealth also introduced, without objection, the certificates of drug analysis referring to the defendant as Terrence Young. Following the detective’s testimony, a few members of the jury asked the court to clarify the identity of Terrence Young.3 The judge told the jury that any reference to Terrence Young referred to the defendant. [753]*753He also cautioned them not to speculate, talk about, or draw any conclusions about why that is so.4
“Aliases can be suggestive of bad character and prior criminality, and therefore raise a possibility that the jury will improperly consider criminal propensity.” Commonwealth v. Martin, 442 Mass. 1002,1002 (2004), quoting from Commonwealth v. Carter, 423 Mass. 506, 514 (1996). See Commonwealth v. Sheline, 391 Mass. 279, 286 (1984). In Martin, supra, the court reversed the defendant’s conviction because “repeated references to [the defendant’s] prior use of an alias before and during the Commonwealth’s case-in-chief (compounded by further references in the Commonwealth’s rebuttal case and closing argument) constituted a gratuitous, improper, and prejudicial attack on the defendant’s character and credibility” without him having “put his character or reputation, or his use of an alias, at issue.” Id. at 1003.5
Here, the prosecution did not exploit Detective Kanavich’s references to the defendant as Young, nor the name on the drug certificates; the prosecutor never referred to the defendant other than as “Mr. Reeder” or “the defendant,” nor did she refer to the defendant’s use of another name in her closing statement. This case is unlike Commonwealth v. Carter, supra at 515, where the defendant was charged with murder: the court found that the Commonwealth and its witnesses’ “continuous” use of “Kilo,” a street name alias referring to the defendant, did not create a substantial risk of a miscarriage of justice even without a cautionary instruction, due to the “ample other and more direct evidence of the defendant’s familiarity with drugs.” Compare Commonwealth v. Durango, 47 Mass. App. Ct. 185, 189 (1999) (finding no prejudicial error, considering the overwhelming strength of the Commonwealth’s case, despite there being no evidence relevant to whether “the defendant had sought any strategic advantage through [754]*754the use of an alias in the context of the offense for which he was being tried, or that an alias was in any way used to further his drug trafficking activities”). We determine that there was no prejudicial error here.
2. Prior employment of officer. The defendant next contends that the judge committed prejudicial error when he allowed Officer Donnellan to testify that he and the defendant had met at the house of correction.6 After the officer had testified that he had met the defendant during his previous employment, two jurors asked where the officer had been previously employed. The judge allowed the question.7 After the officer answered, the judge cautioned the jury not to draw any adverse conclusions about that fact, saying that there are many people who pass through the house of correction, including, among others, visitors and people awaiting trial who are later acquitted.8
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Fecteau, J.
The defendant appeals from convictions of distribution of heroin (three counts) and distribution of heroin in a school zone (three counts) following a jury trial in the Superior Court. He raises three issues on appeal: that the judge erred in [751]*751admitting evidence of an alias; that the judge erred in permitting an officer to testify that he had previously met the defendant at the house of correction; and that admitting a drug laboratory’s certificates of analysis violated his right, pursuant to the Sixth Amendment to the United States Constitution, to confront witnesses. We affirm.
Background. In January and February, 2004, Detective Billie Jean Kanavich of the Boston University police department drug control unit was a part of an undercover drug operation at 850 Harrison Avenue in Boston. She posed as a person seeking drugs and conducted four transactions with the defendant while two other officers, including Boston University police Officer William Donnellan, conducted surveillance.
All four transactions began in a similar manner with Detective Kanavich standing either in the plaza at 850 Harrison Avenue (on January 22 and February 2, 2004) or in the lobbies of 850 (February 18, 2004) or 840 Harrison Avenue (February 19, 2004), attempting to make contact with drug dealers and engaging with a tall black male, whom she identified in court as the defendant, Terry Reeder. On each occasion, learning that she wanted heroin, the defendant indicated that he knew someone in the area who sold heroin and asked her how much she wanted. On three occasions, Detective Kanavich responded that she wanted a twenty-dollar bag (she asked for two twenty-dollar bags on February 2), and the defendant told her to walk with him along Massachusetts Avenue toward Shawmut Avenue. On the first two occasions, they stopped in front of a convenience store on the comer of Massachusetts Avenue and Shawmut Avenue, and on the latter two, they stopped at 616 Massachusetts Avenue. The defendant would then ask Detective Kanavich for the money. On two occasions, January 22, and February 18, she saw the defendant meet with a woman and make an exchange.1 On February 2, 2004, Detective Kanavich did not see the woman; when she gave Reeder the money, he left her field of vision and later returned with two packets of folded lottery paper. On February 18, the defendant walked up Massachusetts Avenue toward Shawmut, [752]*752and was out of sight for a time; he returned with a woman and Detective Kanavich saw “hand to hand movements between the two of them.”
On each of the four occasions, Reeder then returned and handed the folded lottery paper (twice in a napkin) to Detective Kanavich, who then left the area and met with her surveillance team, which included Officer Donnellan. After the first transaction on January 22, Officer Donnellan told Detective Kanavich that he recognized the black male subject as Terry Reeder, whom he had met during the officer’s prior employment as a deputy sheriff at the Suffolk County house of correction, and that he knew him both by name and by sight.2
After each transaction, Detective Kanavich then returned to the station, opened the lottery paper, and noted that it contained a light brown powdery substance which she bagged and placed in an evidence locker. This evidence was later transmitted to the laboratory and certified as heroin.
Discussion. 1. Alias. The defendant contends that repeated reference to his alias constituted prejudicial error. We disagree. The name of the defendant, as originally listed on the indictments, was Terrence Young. Prior to trial, the defendant filed a motion to “correct” the indictments to reflect the defendant’s “true name” of Terry Reeder, and for an order that the Commonwealth not refer to the defendant as Terrence Young or any other alias. The judge allowed the motion without objection from the Commonwealth. When discussing the first two drug transactions, Detective Kanavich twice referred to the defendant as “Mr. Young” without objection. The Commonwealth also introduced, without objection, the certificates of drug analysis referring to the defendant as Terrence Young. Following the detective’s testimony, a few members of the jury asked the court to clarify the identity of Terrence Young.3 The judge told the jury that any reference to Terrence Young referred to the defendant. [753]*753He also cautioned them not to speculate, talk about, or draw any conclusions about why that is so.4
“Aliases can be suggestive of bad character and prior criminality, and therefore raise a possibility that the jury will improperly consider criminal propensity.” Commonwealth v. Martin, 442 Mass. 1002,1002 (2004), quoting from Commonwealth v. Carter, 423 Mass. 506, 514 (1996). See Commonwealth v. Sheline, 391 Mass. 279, 286 (1984). In Martin, supra, the court reversed the defendant’s conviction because “repeated references to [the defendant’s] prior use of an alias before and during the Commonwealth’s case-in-chief (compounded by further references in the Commonwealth’s rebuttal case and closing argument) constituted a gratuitous, improper, and prejudicial attack on the defendant’s character and credibility” without him having “put his character or reputation, or his use of an alias, at issue.” Id. at 1003.5
Here, the prosecution did not exploit Detective Kanavich’s references to the defendant as Young, nor the name on the drug certificates; the prosecutor never referred to the defendant other than as “Mr. Reeder” or “the defendant,” nor did she refer to the defendant’s use of another name in her closing statement. This case is unlike Commonwealth v. Carter, supra at 515, where the defendant was charged with murder: the court found that the Commonwealth and its witnesses’ “continuous” use of “Kilo,” a street name alias referring to the defendant, did not create a substantial risk of a miscarriage of justice even without a cautionary instruction, due to the “ample other and more direct evidence of the defendant’s familiarity with drugs.” Compare Commonwealth v. Durango, 47 Mass. App. Ct. 185, 189 (1999) (finding no prejudicial error, considering the overwhelming strength of the Commonwealth’s case, despite there being no evidence relevant to whether “the defendant had sought any strategic advantage through [754]*754the use of an alias in the context of the offense for which he was being tried, or that an alias was in any way used to further his drug trafficking activities”). We determine that there was no prejudicial error here.
2. Prior employment of officer. The defendant next contends that the judge committed prejudicial error when he allowed Officer Donnellan to testify that he and the defendant had met at the house of correction.6 After the officer had testified that he had met the defendant during his previous employment, two jurors asked where the officer had been previously employed. The judge allowed the question.7 After the officer answered, the judge cautioned the jury not to draw any adverse conclusions about that fact, saying that there are many people who pass through the house of correction, including, among others, visitors and people awaiting trial who are later acquitted.8 While the officer’s testimony about his prior employment did not directly indicate [755]*755that the defendant had been incarcerated, the defendant was vulnerable to an adverse inference, especially considering the circumstance of a trial that involved allegations of his involvement in multiple criminal acts.
“Although references to prior incarcerations obviously suggest that a defendant has been previously convicted of other crimes, such references are admissible if otherwise relevant, unless their probative value is substantially outweighed by their potential prejudicial effect. See, e.g., Commonwealth v. Walden, 380 Mass. 724, 732 (1980); Commonwealth v. Chalifoux, 362 Mass. 811, 815-816 (1973).” Commonwealth v. Connor, 392 Mass. 838, 852 (1984). “Whether evidence is legally relevant, however, is a question generally left in close calls to the discretion of the trial judge.” Commonwealth v. Bettencourt, 20 Mass. App. Ct. 923, 925 (1985), citing Commonwealth v. Chasson, 383 Mass. 183,187 (1981). Certainly if the defendant’s identification was a contested issue at trial, Officer Donnellan’s prior knowledge of the defendant from prior experiences with him was relevant, even perhaps to the details of those experiences. Here, however, the issue of the defendant’s identification was not a live issue — indeed, defense counsel said as much during the exchange with the judge, consistent with his opening statement and his cross-examination of the officers. Instead, the defense focused on the officers’ “instigation” of the offense and their right to follow the defendant away from the territorial jurisdiction of Boston University Medical Center where they were employed as officers, and to build their case against him from their extraterritorial observations. Nevertheless, given the overwhelming evidence of four hand-to-hand drug transactions between the same undercover detective and the defendant, witnessed by another officer who knew the defendant, and the manner in which the case was defended, we consider that the defendant was not significantly [756]*756prejudiced. See Commonwealth v. Jenner, 426 Mass. 163, 165 (1997) (although it was error to admit statements, the error did not significantly prejudice defendant where there was ample evidence allowing the jury to find the defendant guilty); Commonwealth v. Durango, 47 Mass. App. Ct. 185,189 (1999) (“[T]he admission of the evidence did not constitute prejudicial error requiring reversal. The Commonwealth’s case was overwhelmingly strong. . . . We think that the jury’s verdict was not affected by the [erroneously admitted] evidence”). This is not to say that we condone the manner in which the information came into the jury’s possession. Indeed, our approval of the judge’s decision to allow this question to be answered, given the subject, was not without some reservation.
The subject of juror questions was most recently discussed in the case of Commonwealth v. Britto, 433 Mass. 596 (2001). While juror questions in that case did not prejudicially affect that trial, the “case nevertheless illustrates some of the difficulties that can arise when questions are solicited from jurors.” Id. at 612. We have expressed concern that “allowing jurors to question witnesses has the potential for introducing prejudice, delay, and error into the trial.” Id. at 612-613, quoting from Commonwealth v. Urena, 417 Mass. 692, 701 (1994).
“It bears emphasizing that the decision to allow juror questioning and the manner of questioning rests in the sound discretion of the trial judge.” Id. at 613. However, that discretion must not be abdicated. In Britto, the Supreme Judicial Court cautioned “that the jury also be instructed not to let themselves become aligned with any party, and that their questions should not be directed at helping or responding to any party. Rather, they must remain neutral and impartial, and not assume the role of investigator or of advocate.” Ibid. Further, “[t]he judge should ‘emphasize[] to jurors that, although they are not expected to understand the technical rules of evidence, their questions must comply with those rules, and so the judge may have to alter or to refuse a particular question.’ ” Ibid., quoting from Urena, supra at 702.
Here, the judge originally ruled that the officer should not reveal that he had worked at the house of correction, implying that the evidence would be overly prejudicial. However, the judge reversed himself, solely, it seems, as a result of juror questions. [757]*757The posture of the defendant’s identification had not changed between the judge’s first order, excluding the employment reference, and the latter ruling, permitting the question to be answered.
We believe that under these circumstances, a better course would have been for the judge to exercise his discretion and decline the question. As the issue of the witness’s credibility on the defendant’s identification was not being challenged, the details of the officer’s prior employment had no bearing on the determination of the defendant’s guilt or innocence. As cautioned by Britto and Urena, supra, juror questions should not be given disproportionate weight; a judge should not allow juror questions that are inconsistent with the rules of evidence or, certainly, the defendant’s due process rights. In this case, the judge’s concern about fairness to the jurors appears to have outweighed the need for appropriate balancing of relevance against prejudice. By permitting the question to be asked, the judge risked a realization of the potential for prejudice, cautioned by Urena, supra, which, in a closer case, might have required a retrial.
3. Drug certificates. Finally, the defendant claims that the admission of the drug certificates violated his Sixth Amendment right to confront the witnesses against him. Since there was no objection at trial, we examine the issue to determine whether a substantial risk of a miscarriage of justice was created. Commonwealth v. Verde, 444 Mass. 279, 282-285 (2005), controls on this issue, and under that case, the Supreme Judicial Court decided that drug certificates were business records and thus did not implicate the confrontation clause. Since there was no dispute at trial over the nature of the substances, we do not believe that the introduction of this evidence caused justice to miscarry.9
Judgments affirmed.