Cypher, J.
We are asked in this case to apply the ruling in Melendez-Diaz v. Massachusetts, 129 S. Ct. 2527 (2009), to determine whether the erroneous admission of certificates of drug analysis, in the circumstances, was reversible error. We conclude that it was.
The defendant, Mario M. Perez, was convicted by a Superior Court jury in July, 2004, of trafficking in cocaine between twenty-eight and one hundred grams, G. L. c. 94C, § 32E(¿)(2).1 He appeals, claiming that (1) his motion for a required finding of not guilty was improperly denied; (2) his pretrial motion to suppress evidence was improperly denied; and (3) his confrontation rights under the Sixth Amendment to the United States Constitution were violated by the introduction of certificates of drug analysis without the testimony of the analysts, or an opportunity to cross-examine them.
Background. On February 23, 2001, Brockton and State police executed a search warrant for the first-floor apartment of a two-family dwelling that had been under surveillance for a few weeks. In anticipation of executing the warrant, several police officers parked across the street from the house; they saw the defendant and a woman park in front of the house and then walk in the front entrance. About ten minutes later, the defendant came through a door on the driveway side of the house, went down the stairs, moved to one side, and bent over. A fence precluded the police from further view of the defendant. Shortly thereafter, the defendant saw the police and fled into the house, throwing something. The order to execute the warrant was given, and the police entered the house. They found the defendant in a bedroom stuffing objects in his mouth, attempting to swallow them.
Turning their attention to the outside area where the defendant had been seen, police discovered a Marlboro cigarette box [441]*441about a dozen feet from the house which appeared to be the object that had been thrown. It contained nine packets of what appeared to be cocaine. Noticing freshly disturbed earth and a dirt-covered spoon in a snow-covered area next to the house, the officers began digging in the soft earth, uncovering foil-covered plastic bags thought to be cocaine.
After a systematic search of the house, police found over $1,700 in cash, two boxes of sandwich bags, a police scanner in operation, 126 clear plastic bags containing a “white rock-like powder,” a scale, a pager, and two cellular telephones, among other items and documents.
Discussion. 1. Denial of motion to suppress. The defendant argues that the motion judge erroneously concluded that the police properly seized the packages of suspected cocaine they found after digging in the area of freshly disturbed earth near the side entrance to the house because that search exceeded the scope of the search warrant.2 He asserts that area was not within the curtilage of the house. We disagree. That area was about three feet from the stairway to the side door, next to the foundation, and beneath a first-floor window. In addition to its physical proximity to the house, the area was within a relatively enclosed portion of the yard, and its use was apparently limited to occupants of the house. Compare Commonwealth v. Pierre, 71 Mass. App. Ct. 58, 62 (2008). The observed actions of the defendant indicated that he exercised control of the area.
There is no merit in the defendant’s further assertion that he had a privacy interest in burying the drugs. Here, it is apparent that the drugs were secreted to escape detection, and the search conducted within the curtilage was proper. The police were not required to establish independent probable cause for that portion of the search. Compare Commonwealth v. Signorine, 404 Mass. 400, 405 (1989).
The defendant’s motion to suppress was properly denied.
2. Denial of motion for required finding of not guilty. We examine the evidence according to the familiar standard of [442]*442Commonwealth v. Latimore, 378 Mass. 671, 677-678 (1979). There was ample evidence of constructive possession through the defendant’s knowledge of the drugs’ presence and his ability and intention to exercise control of the drugs. Compare Commonwealth v. Brzezinski, 405 Mass. 401, 409-410 (1989), and cases cited. The defendant’s connection with the house had been observed through surveillance, and on the day of the search, he was seen entering the house and then emerging from the side door; upon seeing the police, he threw a cigarette box containing nine bags of suspected cocaine and fled into the house. A large number of packets of suspected cocaine later were found buried outside only a few feet from the steps to the side door. When police encountered the defendant in the house, he was observed stuffing packets of suspected cocaine in his mouth, attempting to swallow them. Compare Commonwealth v. Rodriguez, 75 Mass. App. Ct. 235, 244 (2009) (attempt to swallow drugs adds to other evidence of guilt on drug charges). The defendant’s attempt to distance himself from these drugs is evidence from which the jury could infer consciousness of guilt. Compare Commonwealth v. Pena, 40 Mass. App. Ct. 905, 906 (1996). The large quantity of bags of suspected cocaine, packaged in sizes commonly sold on the street, together with items known to be “traditional accoutrements of the illegal drug trade,” were sufficient evidence of intent to distribute. Compare ibid., and cases cited.
The defendant’s motion for a required finding of not guilty properly was denied.
3. The certificates of drug analysis. The defendant states in a single paragraph in his brief that, although he made no objection, the introduction of three certificates of drug analysis in his July, 2004, trial violated his confrontation rights as set forth in Crawford v. Washington, 541 U.S. 36 (2004). The defendant notes that, during the pendency of his appeal, the United States Supreme Court granted certiorari in Commonwealth v. Melendez-Diaz, 69 Mass. App. Ct. 1114 (2007), which challenged the admission of certificates of analysis without the testimony of the analyst or an opportunity to cross-examine the analyst. Subsequently, the Supreme Court ruled that “[t]he Sixth Amendment does not permit the prosecution to prove its case via ex parte out-of-court affidavits, and the admission of such evidence [443]*443against Melendez-Diaz was error.” Melendez-Diaz v. Massachusetts, 129 S. Ct. 2527, 2542 (2009).3
Although prior to oral argument we invited the parties to submit supplemental memoranda concerning the effect of Melendez-Diaz on this case, only the Commonwealth submitted a supplemental memorandum. The Commonwealth asks that we conduct our review under the substantial risk of a miscarriage of justice standard because the defendant did not object to the admission of the certificates at trial. It is not necessary to determine whether the posture of this case requires that we review under the higher standard of harmless beyond a reasonable doubt because we conclude, for the reasons that follow, that the defendant is entitled to relief under either standard.
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Cypher, J.
We are asked in this case to apply the ruling in Melendez-Diaz v. Massachusetts, 129 S. Ct. 2527 (2009), to determine whether the erroneous admission of certificates of drug analysis, in the circumstances, was reversible error. We conclude that it was.
The defendant, Mario M. Perez, was convicted by a Superior Court jury in July, 2004, of trafficking in cocaine between twenty-eight and one hundred grams, G. L. c. 94C, § 32E(¿)(2).1 He appeals, claiming that (1) his motion for a required finding of not guilty was improperly denied; (2) his pretrial motion to suppress evidence was improperly denied; and (3) his confrontation rights under the Sixth Amendment to the United States Constitution were violated by the introduction of certificates of drug analysis without the testimony of the analysts, or an opportunity to cross-examine them.
Background. On February 23, 2001, Brockton and State police executed a search warrant for the first-floor apartment of a two-family dwelling that had been under surveillance for a few weeks. In anticipation of executing the warrant, several police officers parked across the street from the house; they saw the defendant and a woman park in front of the house and then walk in the front entrance. About ten minutes later, the defendant came through a door on the driveway side of the house, went down the stairs, moved to one side, and bent over. A fence precluded the police from further view of the defendant. Shortly thereafter, the defendant saw the police and fled into the house, throwing something. The order to execute the warrant was given, and the police entered the house. They found the defendant in a bedroom stuffing objects in his mouth, attempting to swallow them.
Turning their attention to the outside area where the defendant had been seen, police discovered a Marlboro cigarette box [441]*441about a dozen feet from the house which appeared to be the object that had been thrown. It contained nine packets of what appeared to be cocaine. Noticing freshly disturbed earth and a dirt-covered spoon in a snow-covered area next to the house, the officers began digging in the soft earth, uncovering foil-covered plastic bags thought to be cocaine.
After a systematic search of the house, police found over $1,700 in cash, two boxes of sandwich bags, a police scanner in operation, 126 clear plastic bags containing a “white rock-like powder,” a scale, a pager, and two cellular telephones, among other items and documents.
Discussion. 1. Denial of motion to suppress. The defendant argues that the motion judge erroneously concluded that the police properly seized the packages of suspected cocaine they found after digging in the area of freshly disturbed earth near the side entrance to the house because that search exceeded the scope of the search warrant.2 He asserts that area was not within the curtilage of the house. We disagree. That area was about three feet from the stairway to the side door, next to the foundation, and beneath a first-floor window. In addition to its physical proximity to the house, the area was within a relatively enclosed portion of the yard, and its use was apparently limited to occupants of the house. Compare Commonwealth v. Pierre, 71 Mass. App. Ct. 58, 62 (2008). The observed actions of the defendant indicated that he exercised control of the area.
There is no merit in the defendant’s further assertion that he had a privacy interest in burying the drugs. Here, it is apparent that the drugs were secreted to escape detection, and the search conducted within the curtilage was proper. The police were not required to establish independent probable cause for that portion of the search. Compare Commonwealth v. Signorine, 404 Mass. 400, 405 (1989).
The defendant’s motion to suppress was properly denied.
2. Denial of motion for required finding of not guilty. We examine the evidence according to the familiar standard of [442]*442Commonwealth v. Latimore, 378 Mass. 671, 677-678 (1979). There was ample evidence of constructive possession through the defendant’s knowledge of the drugs’ presence and his ability and intention to exercise control of the drugs. Compare Commonwealth v. Brzezinski, 405 Mass. 401, 409-410 (1989), and cases cited. The defendant’s connection with the house had been observed through surveillance, and on the day of the search, he was seen entering the house and then emerging from the side door; upon seeing the police, he threw a cigarette box containing nine bags of suspected cocaine and fled into the house. A large number of packets of suspected cocaine later were found buried outside only a few feet from the steps to the side door. When police encountered the defendant in the house, he was observed stuffing packets of suspected cocaine in his mouth, attempting to swallow them. Compare Commonwealth v. Rodriguez, 75 Mass. App. Ct. 235, 244 (2009) (attempt to swallow drugs adds to other evidence of guilt on drug charges). The defendant’s attempt to distance himself from these drugs is evidence from which the jury could infer consciousness of guilt. Compare Commonwealth v. Pena, 40 Mass. App. Ct. 905, 906 (1996). The large quantity of bags of suspected cocaine, packaged in sizes commonly sold on the street, together with items known to be “traditional accoutrements of the illegal drug trade,” were sufficient evidence of intent to distribute. Compare ibid., and cases cited.
The defendant’s motion for a required finding of not guilty properly was denied.
3. The certificates of drug analysis. The defendant states in a single paragraph in his brief that, although he made no objection, the introduction of three certificates of drug analysis in his July, 2004, trial violated his confrontation rights as set forth in Crawford v. Washington, 541 U.S. 36 (2004). The defendant notes that, during the pendency of his appeal, the United States Supreme Court granted certiorari in Commonwealth v. Melendez-Diaz, 69 Mass. App. Ct. 1114 (2007), which challenged the admission of certificates of analysis without the testimony of the analyst or an opportunity to cross-examine the analyst. Subsequently, the Supreme Court ruled that “[t]he Sixth Amendment does not permit the prosecution to prove its case via ex parte out-of-court affidavits, and the admission of such evidence [443]*443against Melendez-Diaz was error.” Melendez-Diaz v. Massachusetts, 129 S. Ct. 2527, 2542 (2009).3
Although prior to oral argument we invited the parties to submit supplemental memoranda concerning the effect of Melendez-Diaz on this case, only the Commonwealth submitted a supplemental memorandum. The Commonwealth asks that we conduct our review under the substantial risk of a miscarriage of justice standard because the defendant did not object to the admission of the certificates at trial. It is not necessary to determine whether the posture of this case requires that we review under the higher standard of harmless beyond a reasonable doubt because we conclude, for the reasons that follow, that the defendant is entitled to relief under either standard.
The Commonwealth bears the burden of proving beyond a reasonable doubt every element of the charged crime of distribution of cocaine, particularly whether the substances were cocaine and their weight. The Commonwealth argues that the nature of the substances was not a live issue at trial and that the defense concentrated on claiming that the evidence was insufficient to show that the defendant possessed the cocaine that had been buried. These arguments are unavailing. The Commonwealth is not relieved of its burden of proving every element of a crime beyond a reasonable doubt either by a defendant’s failure to contest an essential element, Commonwealth v. Gabbidon, 398 Mass. 1, 5 (1986), or by pursuing his particular theory of the case. Commonwealth v. Cowans, 52 Mass. App. Ct. 811, 821 (2001). Commonwealth v. Muniz, 456 Mass. 166, 173 n.7 (2010).
Next, the Commonwealth argues that “[pjroof that a substance is a particular drug need not be made by chemical analysis,” and that a judge may find that the experience of a police officer “would . . . permit him to give an opinion as to what drug a particular substance was.” Commonwealth v. Dawson, 399 Mass. 465, 467 (1987). While there was no express finding in this case, there was police testimony regarding the appearance of cocaine powder and rock, and its packaging and street-selling prices. However, beyond statements that the substances seized “appeared” to be cocaine, no opinions, based on objective [444]*444criteria, were offered to support those conclusory observations. Compare Commonwealth v. DePina, 75 Mass. App. Ct. 842, 852-853 (2009). No field testing was performed.4 Contrast Commonwealth v. Connolly, 454 Mass. 808, 831 (2009) (officer who field tested substance was identified and testified). Moreover, there was no evidence independent of the certificates of the weight of the substances. While there was much testimony relating the weight of packages to selling prices, such as “twenties” or “forties,” the testimony did not provide the jury with a rule of thumb from which they could determine and add the weights of the 126 packages to verify that they fell within the twenty-eight to one hundred grams of the charged offense. See Commonwealth v. DePina, supra at 852; Commonwealth v. Rivera, ante 67, 70 (2009). Also, without some understandable standard of comparison to the avoirdupois system, jurors could not be expected to determine weights in the metric system. Contrast Commonwealth v. Connolly, supra at 831-832.5
Finally, the Commonwealth’s reliance on the certificates was significant. The prosecutor referred in closing to those documents.6 See Commonwealth v. Ware, ante 53, 58 (2009). The judge instructed the jury that the certificates are prima facie evidence and may be considered along with other evidence if the jury accepted that other evidence, but did not instruct that the jury need not accept the certificates.7
Without the certificates, the Commonwealth’s evidence falls [445]*445far short of its required proof. General Laws c. Ill, § 13, as amended through St. 1992, c. 378, provides that the certificate “shall be prima facie evidence of the composition, quality, and the net weight of the narcotic or other drug. ” In the circumstances of this case, the evidence independent of the certificates was inadequate to avoid a conclusion that there was a substantial risk of a miscarriage of justice.
Judgment reversed.
Verdict set aside.