Gants, J.
The defendant was convicted in the Boston Municipal Court Department of distribution of cocaine, in violation of G. L. c. 94C, § 32A (a); possession of cocaine, in violation of G. L. c. 94C, § 34; and distribution of cocaine within one hundred feet of a public park, in violation of G. L. c. 94C, § 32J. The Appeals Court reversed the judgments of conviction, set aside the verdicts, and remanded the case after concluding that the motion judge erred in denying the defendant’s motion to suppress.
Commonwealth
v.
Rodriguez,
74 Mass. App. Ct. 314 (2009). We granted the Commonwealth’s application for further appellate review. We conclude that the evidence was insufficient as a matter of law to warrant a guilty finding on the two distribution counts and direct that a judgment of acquittal enter on those counts. We reverse the judgment of conviction of possession of cocaine, although on grounds different from those relied on by the Appeals Court, and remand the case for a new suppression hearing and trial.
1.
Evidence at trial.
Because the defendant challenges the sufficiency of the evidence, we summarize in detail the evidence, considering it in the light most favorable to the Commonwealth and reserving certain details for our analysis of the other issues raised on appeal. See
Commonwealth
v.
Farley,
443 Mass. 740, 741, cert, denied, 546 U.S. 1035 (2005).
At approximately 1:40 p.m. on September 23, 2006, Detective
Robert Pieroway, a plainclothes Boston police officer assigned to a drug control unit, was traveling in the passenger seat of an unmarked police vehicle when he observed the defendant standing with a group of men in Franklin Square Park in the South End section of Boston. Detective Pieroway noticed a woman, later identified as Jessica Rivera, enter the park, stand beside the defendant, and then walk with the defendant to 10 East Brookline Street, in the courtyard of the Cathedral housing development. Outside 10 East Brookline Street, the defendant and Rivera met a man, Alex Cherizard,
on a bicycle, and the three individuals walked up the stairs to the front door of the building, where a fourth person opened the door from inside. As Alex Cherizard was walking up the stairs, he placed his right hand inside the rear of his pants, down to the groin area. The three individuals remained inside the building for approximately thirty seconds, out of view of Detective Pieroway.
The defendant and Rivera then left the building and returned to the park. When they entered the park, Detective Pieroway, from within the unmarked police vehicle approximately thirty to forty feet away, observed the defendant reach into his left pocket, hold out his left hand with the palm up, put his right hand into his palm, and hand something to Rivera.
The detective continued to watch Rivera, as she walked away from the defendant, left the park, and sat next to a man on a bench at a bus stop. Detective Pieroway left the vehicle and approached Rivera on foot. When she saw him, she threw an object to the ground, which the detective retrieved. The object was a one dollar bill containing what he
described as a hard, off-white substance inside. After retrieving this object, he spoke by radio to fellow officers of the drug control unit who were in the immediate area, saying, “It’s a Saturday. Arrest that guy” (referring to the defendant). He explained to the jury that “[a] Saturday is a term used in the drug control unit when we recover drugs off the buyer.” He then conducted a field interrogation observation of Rivera
and told her she would be summonsed to Boston Municipal Court for possession of class B cocaine.
Officer Patrick L. Champagnie, another plainclothes officer assigned to the drug control unit, was in a different unmarked vehicle with Officer Kenneth Reed when he saw the defendant alone in the park. After receiving a communication from another member of the drug control unit. Officers Champagnie and Reed left their vehicle and approached the defendant, who was between one hundred and 150 feet away. When they were nearly beside him and identified themselves, the defendant dropped an object that was in his hand. Officer Champagnie picked up the object, which he described as a “tanish, yellowish colored substance with a hard texture to it.”
Two certificates of drug analysis from assistant analysts at the State Laboratory Institute were admitted in evidence, one certifying that the substance in the one dollar bill weighed 0.15 grams and contained cocaine, and the other certifying that the “loose substance” weighed 0.09 grams and contained cocaine.
2.
Sufficiency of the evidence.
The trial judge denied the defendant’s motion for required findings of not guilty.
We review the denial to determine whether the evidence offered by the Commonwealth was sufficient to permit the jury to infer that the Commonwealth has met its burden of proving the essential elements of the crimes charged beyond a reasonable doubt. See
Commonwealth
v.
Latimore,
378 Mass. 671, 676-677 (1979). “Our analysis asks not whether the evidence requires a finding of guilty, but whether it permits such a finding beyond a reasonable doubt.”
Commonwealth
v.
Nolin,
448 Mass. 207, 215 (2007). “A conviction may be based on circumstantial evidence alone, as long as that evidence is sufficient to find the defendant guilty beyond a reasonable doubt.”
Commonwealth
v.
Platt,
440 Mass. 396, 401 (2003). The evidence must “allow[] us to do more than ‘find that there was some record evidence, however slight, to support each essential element of the offense.’ ”
Corson
v.
Commonwealth,
428 Mass. 193, 197 (1998), quoting
Commonwealth
v.
Mandile,
403 Mass. 93, 94 (1988). Nor will the evidence be sufficient if it relies on conjecture or speculation, or if it tends “equally to support either of two inconsistent propositions.”
Commonwealth
v.
Corson, supra,
quoting
Commonwealth
v.
Rhoades,
379 Mass. 810, 817 (1980). If a rational jury “necessarily would have had to employ conjecture” in choosing among the possible inferences from the evidence presented, the evidence is insufficient to sustain the Commonwealth’s burden of proving guilt beyond a reasonable doubt.
Commonwealth
v.
Croft,
345 Mass. 143, 145 (1962).
We conclude that, viewing the evidence in the light most favorable to the Commonwealth, a rational jury could have found that there was probable cause to believe the defendant distributed the cocaine that Rivera threw to the ground, but could not have
found the defendant guilty of distribution beyond a reasonable doubt.
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Gants, J.
The defendant was convicted in the Boston Municipal Court Department of distribution of cocaine, in violation of G. L. c. 94C, § 32A (a); possession of cocaine, in violation of G. L. c. 94C, § 34; and distribution of cocaine within one hundred feet of a public park, in violation of G. L. c. 94C, § 32J. The Appeals Court reversed the judgments of conviction, set aside the verdicts, and remanded the case after concluding that the motion judge erred in denying the defendant’s motion to suppress.
Commonwealth
v.
Rodriguez,
74 Mass. App. Ct. 314 (2009). We granted the Commonwealth’s application for further appellate review. We conclude that the evidence was insufficient as a matter of law to warrant a guilty finding on the two distribution counts and direct that a judgment of acquittal enter on those counts. We reverse the judgment of conviction of possession of cocaine, although on grounds different from those relied on by the Appeals Court, and remand the case for a new suppression hearing and trial.
1.
Evidence at trial.
Because the defendant challenges the sufficiency of the evidence, we summarize in detail the evidence, considering it in the light most favorable to the Commonwealth and reserving certain details for our analysis of the other issues raised on appeal. See
Commonwealth
v.
Farley,
443 Mass. 740, 741, cert, denied, 546 U.S. 1035 (2005).
At approximately 1:40 p.m. on September 23, 2006, Detective
Robert Pieroway, a plainclothes Boston police officer assigned to a drug control unit, was traveling in the passenger seat of an unmarked police vehicle when he observed the defendant standing with a group of men in Franklin Square Park in the South End section of Boston. Detective Pieroway noticed a woman, later identified as Jessica Rivera, enter the park, stand beside the defendant, and then walk with the defendant to 10 East Brookline Street, in the courtyard of the Cathedral housing development. Outside 10 East Brookline Street, the defendant and Rivera met a man, Alex Cherizard,
on a bicycle, and the three individuals walked up the stairs to the front door of the building, where a fourth person opened the door from inside. As Alex Cherizard was walking up the stairs, he placed his right hand inside the rear of his pants, down to the groin area. The three individuals remained inside the building for approximately thirty seconds, out of view of Detective Pieroway.
The defendant and Rivera then left the building and returned to the park. When they entered the park, Detective Pieroway, from within the unmarked police vehicle approximately thirty to forty feet away, observed the defendant reach into his left pocket, hold out his left hand with the palm up, put his right hand into his palm, and hand something to Rivera.
The detective continued to watch Rivera, as she walked away from the defendant, left the park, and sat next to a man on a bench at a bus stop. Detective Pieroway left the vehicle and approached Rivera on foot. When she saw him, she threw an object to the ground, which the detective retrieved. The object was a one dollar bill containing what he
described as a hard, off-white substance inside. After retrieving this object, he spoke by radio to fellow officers of the drug control unit who were in the immediate area, saying, “It’s a Saturday. Arrest that guy” (referring to the defendant). He explained to the jury that “[a] Saturday is a term used in the drug control unit when we recover drugs off the buyer.” He then conducted a field interrogation observation of Rivera
and told her she would be summonsed to Boston Municipal Court for possession of class B cocaine.
Officer Patrick L. Champagnie, another plainclothes officer assigned to the drug control unit, was in a different unmarked vehicle with Officer Kenneth Reed when he saw the defendant alone in the park. After receiving a communication from another member of the drug control unit. Officers Champagnie and Reed left their vehicle and approached the defendant, who was between one hundred and 150 feet away. When they were nearly beside him and identified themselves, the defendant dropped an object that was in his hand. Officer Champagnie picked up the object, which he described as a “tanish, yellowish colored substance with a hard texture to it.”
Two certificates of drug analysis from assistant analysts at the State Laboratory Institute were admitted in evidence, one certifying that the substance in the one dollar bill weighed 0.15 grams and contained cocaine, and the other certifying that the “loose substance” weighed 0.09 grams and contained cocaine.
2.
Sufficiency of the evidence.
The trial judge denied the defendant’s motion for required findings of not guilty.
We review the denial to determine whether the evidence offered by the Commonwealth was sufficient to permit the jury to infer that the Commonwealth has met its burden of proving the essential elements of the crimes charged beyond a reasonable doubt. See
Commonwealth
v.
Latimore,
378 Mass. 671, 676-677 (1979). “Our analysis asks not whether the evidence requires a finding of guilty, but whether it permits such a finding beyond a reasonable doubt.”
Commonwealth
v.
Nolin,
448 Mass. 207, 215 (2007). “A conviction may be based on circumstantial evidence alone, as long as that evidence is sufficient to find the defendant guilty beyond a reasonable doubt.”
Commonwealth
v.
Platt,
440 Mass. 396, 401 (2003). The evidence must “allow[] us to do more than ‘find that there was some record evidence, however slight, to support each essential element of the offense.’ ”
Corson
v.
Commonwealth,
428 Mass. 193, 197 (1998), quoting
Commonwealth
v.
Mandile,
403 Mass. 93, 94 (1988). Nor will the evidence be sufficient if it relies on conjecture or speculation, or if it tends “equally to support either of two inconsistent propositions.”
Commonwealth
v.
Corson, supra,
quoting
Commonwealth
v.
Rhoades,
379 Mass. 810, 817 (1980). If a rational jury “necessarily would have had to employ conjecture” in choosing among the possible inferences from the evidence presented, the evidence is insufficient to sustain the Commonwealth’s burden of proving guilt beyond a reasonable doubt.
Commonwealth
v.
Croft,
345 Mass. 143, 145 (1962).
We conclude that, viewing the evidence in the light most favorable to the Commonwealth, a rational jury could have found that there was probable cause to believe the defendant distributed the cocaine that Rivera threw to the ground, but could not have
found the defendant guilty of distribution beyond a reasonable doubt. The jury reasonably could have inferred that the defendant and Rivera went to 10 East Brookline Street for the purpose of purchasing cocaine, in light of their rendezvous with Cherizard, Cherizard’s reaching into his groin area as they walked up the stairs to the front door, the brevity of their stay, and their possession of cocaine minutes later.
However, they could not reasonably infer beyond a reasonable doubt that all the cocaine purchased was given to the defendant and that he then distributed some of it to Rivera. Because no witness observed what went on inside the building, such an inference rests solely on Detective Pieroway’s observation that, after they left the building and returned to the park, the defendant gave something to Rivera that he took from his left pocket and placed in the palm of his left hand. Detective Pieroway, however, could not see what, if anything, the defendant gave to Rivera.
The Commonwealth argues that it is reasonable to infer that he was splitting a rock of “crack” cocaine with his right hand, but as noted, see note 2,
supra,
there is no evidence in the record that the defendant broke or snapped off anything with his right hand. The detective testified only that the defendant put his right hand in his left palm and handed something to Rivera. The inference that he handed cocaine to Rivera may be plausible, but cannot bear the weight of proof beyond reasonable doubt. It is as plausible, certainly plausible enough to yield a reasonable doubt, that Rivera obtained the cocaine inside the building from Cherizard and received something other than cocaine from the defendant. See
Commonwealth
v.
Senati,
3 Mass. App. Ct. 304, 306 (1975) (acquittal of cocaine distribution charge required where “it was at least equally inferable” that alleged buyer of
cocaine “had possession of the cocaine throughout the transaction [if there was one]”). See also
Commonwealth
v.
Reid,
29 Mass. App. Ct. 537 (1990).
The inference the Commonwealth seeks to draw from the detective’s limited observations grows even weaker when one considers that the cocaine that Rivera threw to the ground when Detective Pieroway approached her was wrapped in a one dollar bill. Detective Pieroway’s observations of the defendant’s hands during the supposed distribution of cocaine is not consistent with his wrapping cocaine tightly within a one dollar bill. Because Detective Pieroway continued to observe Rivera until she threw the dollar bill containing cocaine, it would require pure conjecture to conclude that she wrapped the cocaine in a one dollar bill while the detective had her under close surveillance. The presence of the cocaine within the dollar bill is at least as consistent with Rivera’s having received this cocaine inside the building as it is with her receiving it from the defendant in the park.
Moreover, Rivera was not arrested after she threw the cocaine to the ground, so no search took place incident to her arrest and no inventory search of her took place at the police station. Therefore, the finder of fact cannot know whether Rivera had an object in her possession (including coins or cash) other than the cocaine in the dollar bill that plausibly could have been the object given to her by the defendant in the park.
We do not suggest that illegal drug distribution may be proved beyond a reasonable doubt only if a witness actually sees drugs being transferred. “Small quantities of drugs are easily concealed . . . and in certain situations, an illegal drug transaction may be inferred from other circumstances even if what is transferred is not actually seen” (citations omitted).
Commonwealth
v.
Soto,
45 Mass. App. Ct. 109, 112 (1998). Rather, we conclude that where, as here, there are two alleged sequential transactions in which the transfer of drugs was not witnessed, the Commonwealth must present evidence sufficient to establish beyond a reasonable doubt that the defendant during the second transaction distributed the drugs found in the possession of Rivera. See
Commonwealth
v.
Croft, supra
at 144-145.
Because the inferences from the evidence here were too weak to permit a rational jury to conclude beyond a reasonable doubt that the defendant distributed the cocaine in the one dollar bill to Rivera, we reverse the judgments of conviction of distribution of cocaine and distribution of cocaine within one hundred feet of a park, and order that judgments of acquittal enter on those charges. The evidence of the defendant’s possession of the cocaine he threw to the ground when approached by Officers Champagnie and Reed was more than sufficient to sustain his conviction of possession of cocaine, so we now turn to the legal issues relevant to his conviction of that charge.
3.
Motion to suppress.
Prior to trial, the defendant filed a motion to suppress, claiming that he was stopped without reasonable suspicion and arrested without probable cause, and that the fruits of the warrantless search of his person arising from the stop and arrest should be suppressed. In support of his motion, the defendant attached an affidavit, which asserted that on September 23, 2006, police officers ran up and surrounded him, handcuffed his arms behind his back, and searched him without his consent.
The Commonwealth did not object to the adequacy of the defendant’s affidavit. However, at the hearing, before evidence was presented, the Commonwealth asked the judge to deny the defendant’s motion without an evidentiary hearing on the ground that the cocaine he was charged with possessing was found on the ground near the defendant, and that nothing was seized or taken from him. When the motion judge
asked defense counsel the basis of her request to suppress the cocaine found on the ground, defense counsel responded that the defendant was charged with constructive possession of that cocaine and the “threshold inquiry” of the defendant was not based on “reasonable articulable facts.” The judge then asked the Commonwealth to call its first witness, implicitly denying the Commonwealth’s request that the defendant’s motion to suppress be denied without an evidentiary hearing.
The Commonwealth called Detective Pieroway, who testified much as he did subsequently at trial. Detective Pieroway, however, did not testify to the stop or arrest of the defendant, because he was not present when it occurred; he simply testified that he instructed Officers Champagnie and Reed to arrest the defendant for distribution of cocaine. The Commonwealth called no further witnesses; nor did the defendant. When the judge asked the prosecutor why the cocaine should not be suppressed in view of the fact that the judge had heard nothing about it at the evidentiary hearing, the prosecutor argued that he had established that the police had reasonable suspicion, and reiterated that the drugs were found next to the defendant, not on his person (although
there was no evidence at the motion hearing as to where the drugs had been found). The judge ruled that the drugs were not seized from the defendant because they were not found on him, and denied the motion to suppress.
The judge’s ruling was clear error. The only finding of fact the judge made — that the drugs were not found on the defendant’s person — was based on the oral representation of the prosecutor, not the evidence at the hearing. The only ruling of law — that drugs could not be seized from the defendant unless they were found on his person — was also erroneous. No one has a reasonable expectation of privacy in items retrieved from the ground on a public park. However, if the defendant dropped the drugs on the ground
after
he had been stopped by the police, that is, after a reasonable person in view of all the surrounding circumstances would have believed that he was not free to leave, the drugs, even though found on the ground, could have been suppressed as the fruit of an unconstitutional seizure of his person in violation of art. 14 of the Massachusetts Declaration of Rights if the stop were not supported by reasonable suspicion. See
Commonwealth
v.
Depina, ante
238, 242 (2010);
Commonwealth
v.
Stoute,
422 Mass. 782, 789 (1996);
Commonwealth
v.
O’Laughlin,
25 Mass. App. Ct. 998, 999-1000 (1988). See also
Commonwealth
v.
Borges,
395 Mass. 788, 796 (1985) (defendant’s attempt to dispose of evidence not “an independent, intervening act sufficient to justify a subsequent arrest where the disposal is in direct and immediate response” to illegal stop). If he dropped the drugs
before
he was stopped, then the drugs could not be the fruit of the seizure, and therefore would not be subject to suppression regardless of the constitutionality of the subsequent stop. See
Commonwealth
v.
Battle,
365 Mass. 472, 475 (1974). See also
Commonwealth
v.
Pimentel,
27 Mass. App. Ct. 557, 560-562 (1989) (“pivotal question ... is whether the police stopped or seized the defendant before he dropped his drugs”). Because no evidence was presented at the motion hearing whether the stop of the defendant occurred before or after he dropped the drugs on the ground, we cannot assess whether the drugs on the ground were the fruit of the stop. Because there was also no evidence whether the stop of the defendant occurred before or after the retrieval of the drugs dropped on the ground by Rivera, we cannot assess whether the defendant’s stop was supported by reasonable suspicion.
To determine what action is appropriate in the wake of the motion judge’s errors, we first set forth what should have happened. We recently said in
Commonwealth
v.
Mubdi, ante
385, 389-390 (2010):
“Where a defendant has filed a motion to suppress alleging an unconstitutional search or seizure, the detail required in the motion and accompanying affidavit under [Mass. R. Crim. P. 13 (a) (2), as appearing in 442 Mass. 1516 (2004),] must be sufficient to accomplish two practical purposes. First, it must be sufficient to enable a judge to determine whether to conduct an evidentiary hearing. See
Costa
v.
Commonwealth,
440 Mass. 1003, 1004 (2003), quoting
Commonwealth
v.
Santosuosso,
23 Mass. App. Ct. 310, 313 (1986) (one purpose of rule 13 [a] [2] is to provide judge with ‘statement of anticipated evidence ... to meet the defendant’s initial burden of establishing the facts necessary to support’ motion). An evidentiary hearing is necessary only when the defendant has alleged facts that, if true, would establish (1) that evidence was obtained through a search or seizure for which the Commonwealth must prove probable cause, reasonable suspicion, or consent to search; and (2) that the defendant has standing to challenge the constitutionality of the search or seizure. Cf.
Commonwealth
v.
Costa,
65 Mass. App. Ct. 227, 228 n.l (2005). Second, the affidavit required under rule 13 (a) (2) must be sufficiently detailed to give fair notice to the prosecution of the particular search or seizure that the defendant is challenging, so that the prosecution may determine which witnesses it should call and what evidence it should offer to meet its burden of proving probable cause, reasonable suspicion, or consent.
Costa
v.
Commonwealth, supra,
quoting
Commonwealth
v.
Santosuosso, supra
(second purpose of rule 13 [a] [2] is to give Commonwealth ‘fair notice of the specific facts relied on in support of the motion’).”
Because neither the defendant’s motion to suppress nor his affidavit made clear that the defendant was contending that the drugs retrieved by the police from the ground in the park were the fruit of an unlawful stop,
the Commonwealth, before the
evidentiary hearing, should have asked for a more particularized affidavit or moved that the motion to suppress be denied without a hearing for failing to provide the Commonwealth fair notice as to the seizure he was challenging.
Commonwealth
v.
Mubdi, supra
at 390. Alternatively, the motion judge could have ordered a more particularized affidavit on her own motion.
Id.
at 390 n.6. By way of such an accompanying affidavit, the judge and the Commonwealth would have understood the precise basis for the defendant’s motion to suppress and whether there was a need for an evidentiary hearing to resolve the motion. Because the defendant failed to articulate the basis of his suppression claim, and neither the prosecutor nor the judge moved for a more particularized affidavit or otherwise obtained clarification of the defendant’s suppression claim, confusion reigned as to what needed to be proved at the motion hearing.
Generally, the Commonwealth waives any objection to the particularity of the defendant’s affidavit pursuant to rule 13 (a) (2) when it fails to move to dismiss the motion to suppress or for a more particularized affidavit. See
id.
at 390-391. There is no waiver here because, by asking the judge to deny the motion to suppress without a hearing because no one has a reasonable expectation of privacy in the ground of a public park, the Commonwealth communicated to the judge and the defendant its confusion as to the basis of the defendant’s motion, which is the same information that would be communicated through a motion to dismiss or for a more particularized affidavit, and accomplished much the same purpose. This is not a case in which the motion to suppress was heard without any complaint by the Commonwealth as to the particularity or sufficiency of the defendant’s motion; instead, it was a case in which the Commonwealth’s concerns were not adequately addressed by either
the defendant or the judge. In view of these unusual circumstances, we conclude that the fair disposition is to vacate the judge’s denial of the motion to suppress, as well as her findings of fact and conclusion of law, and remand for a new motion hearing.
4.
Certificate of drug analysis.
On appeal, the defendant argues that the admission of the certificate of drug analysis
(certificate) regarding the substance found next to him in the park, without testimony by the analyst with the State laboratory who conducted the testing, violated his confrontation rights under the Sixth Amendment to the United States Constitution. In view of the United States Supreme Court’s decision in
Melendez-Diaz
v.
Massachusetts,
129 S. Ct. 2527 (2009), it was error to admit the certificate.
The defendant objected to the admission of the certificate, but not on confrontation grounds. Rather, he contended that the Commonwealth had failed adequately to establish that the substance analyzed in the certificate was the substance retrieved from the ground next to him at the time of his arrest. We need not, however, debate whether the objection properly preserved the defendant’s constitutional challenge because we recently concluded in
Commonwealth
v.
Vasquez, ante
350, 352 (2010), that even if no objection had been lodged, the defendant is entitled to review of the constitutional error “as though preserved by proper objection at trial.” As a result, we determine whether the admission of the certificate was harmless beyond a reasonable doubt.
Id.
at 355-359.
Because the defendant is charged with possession of cocaine, the burden is on the Commonwealth to prove beyond a reasonable doubt that the substance recovered from the defendant was cocaine. See
Commonwealth
v.
Farley,
443 Mass. 740, 745 (2005) (Commonwealth must “prove each and every element of the crime beyond a reasonable doubt”). The Commonwealth may do so by way of either chemical analysis or circumstantial evidence. See
Commonwealth
v.
McGilvery,
74 Mass. App. Ct. 508, 511 (2009). However, under harmless error review, it is not enough for the Commonwealth to show that the evidence apart from the certificate was “ ‘sufficient’ to convict the defendant” or that the certificate was “ ‘consistent’ with the admissible evidence.”
Commonwealth
v.
Tyree,
455 Mass. 676, 701 (2010), quoting
Commonwealth
v.
Dagraca,
447 Mass. 546, 554-555 (2006) . Rather, the other evidence that the substance possessed was cocaine would have to be so overwhelming as to “nullify any effect” the admission of the certificate “ ‘might have had’ on the fact finder or the [verdicts].”
Commonwealth
v.
Vasquez, supra
at 362, quoting
Commonwealth
v.
Tyree, supra
at 704 n.44.
Here, the Commonwealth failed to establish that the error in admitting the certificate was harmless beyond a reasonable doubt. See
Commonwealth
v.
Vardinski,
438 Mass. 444, 452 (2003) (prosecution bears burden of establishing that error was harmless beyond reasonable doubt). The Commonwealth relied solely on the certificate to prove that the substance was cocaine. No independent evidence was presented to establish the composition of the substances. Neither Detective Pieroway nor Officer Champagnie performed a “field test.” See
Commonwealth
v.
Vasquez, supra
at 364. Apart from the certificate, the only suggestion that the substance was cocaine came from the testimony of Officer Champagnie, who said that the “tanish, yellowish looking object” he picked up off the ground looked and felt like crack cocaine, but that testimony was ordered struck from the record. Because the certificate was the only evidence presented to establish the identity of that substance, the error of admitting the certificate was not harmless beyond a reasonable doubt. Therefore, we reverse the judgment of conviction and remand for a new trial.
5.
“It’s a Saturday.”
Because the defendant may be retried on the charge of cocaine possession, we address one other evidentiary issue that may arise at retrial. At trial, the judge, over objection, allowed Detective Pieroway to testify that he spoke to Rivera and conducted a “field interrogation observation” of her before informing Officers Champagnie and Reed by radio that, “It’s a Saturday. Arrest that guy.” Detective Pieroway explained that “Saturday” is the code word used by police officers with the drug control unit when they recover drugs from the buyer. Admission of the statement, “It’s a Saturday,” with the accompanying explanation, was error.
Through this testimony, the detective essentially offered his opinion that Rivera had bought cocaine from the defendant. Such testimony would not have been admissible if he had been directly asked for his opinion. See
Commonwealth
v.
Woods,
419 Mass. 366, 375 (1995) (police officers’ testimony that defendant involved in drug transaction impermissible expert opinion that defendant guilty of charges). It does not become admissible simply because it was elicited in a less direct fashion.
6.
Conclusion.
Because the evidence was insufficient to sup
port the judgments of conviction of distribution of cocaine and distribution of cocaine within one hundred feet of a park, we order that judgments of acquittal enter on those charges. We reverse the judgment of conviction of possession of cocaine, and remand for a new motion hearing and trial consistent with this opinion.
So ordered.