Spina, J.
The defendant was indicted by a Suffolk County grand jury on one charge of possession of a class B controlled substance (cocaine) with intent to distribute, second offense, in [507]*507violation of G. L. c. 94C, § 32A (c) and (d), and one charge of possession with intent to distribute in a school zone, in violation of G. L. c. 94C, § 32J. He filed a motion to suppress the evidence seized from his person on the grounds that he was unlawfully stopped and searched without a warrant in violation of the Fourth and Fourteenth Amendments to the United States Constitution, art. 14 of the Massachusetts Declaration of Rights, and G. L. c. 276.1 After an evidentiary hearing, a judge in the Superior Court denied the motion. Following a jury trial, the defendant was convicted on both indictments. He appealed, and we transferred the case from the Appeals Court on our own motion. The defendant claims, among other issues that we need not reach, that his motion to suppress should have been allowed because the police seized him without reasonable suspicion of criminal activity and pat frisked him without reason to believe that he was armed and dangerous. For the reasons that follow, we now reverse.2
We summarize the facts as found by the motion judge, supplemented by uncontested testimony from the suppression hearing. See Commonwealth v. DePeiza, 449 Mass. 367, 368 (2007). We do not rely on any facts subsequently developed at trial. See Commonwealth v. Deramo, 436 Mass. 40, 43 (2002).
On December 17, 2005, at around 4 a.m., Boston police Officer Greg Walsh was on patrol in a marked cruiser in the vicinity of Tremont and Stuart Streets in downtown Boston. He was familiar with the area as one where he had made several hundred arrests for drug-related offenses and where there had been numerous shootings, including several involving police officers. On this night, Officer Walsh was working with two [508]*508other members of the drug control unit, Detective Guy and Officer Hynes, who were together in another marked cruiser. The three officers, all of whom were in uniform, were driving slowly and watching for possible illicit activities.
At the intersection of Tremont and Stuart Streets, in the heart of the theater district, the police cruisers made a left turn onto Stuart Street, traveling for a short distance on the wrong side of the road. The defendant and Dennis Bates were standing together in the doorway of a building at 71 Stuart Street. Officer Walsh was familiar with the defendant because his booking photograph was posted on a bulletin board in the police station, identifying him as an “impact player” in the Grove Hall area of the Dor-chester section of Boston.3 The photograph included information about the defendant’s arrest on July 12, 2004, for possession of a controlled substance with intent to distribute.
Officer Walsh observed the defendant and Bates engaging in what appeared to be a drug transaction. The defendant was standing in the doorway with his right hand opened flat as if displaying some object or items to Bates, which Officer Walsh could not see. The police cruisers stopped, the officers left their vehicles, and they started to approach the defendant. As they did so, Officer Walsh saw the defendant put his right hand up to his mouth and appear to swallow something. Officer Walsh asked the defendant what he was doing there, and he immediately conducted a patfnsk for weapons. While the defendant was being patted down, a clear plastic bag containing five individually packaged rocks of “crack” cocaine slid out of his pant leg and onto the ground. Officer Walsh arrested the defendant and transported him to the police station for booking. Bates was also pat frisked, checked for outstanding warrants, and then released. During a more thorough search of the defendant at the police station, officers found additional evidence that was indicative of drug dealing.4
When reviewing the denial of a suppression motion, “we [509]*509accept the judge’s subsidiary findings of fact absent clear error, but conduct an independent review of the judge’s ultimate findings and conclusions of law.” Commonwealth v. Washington, 449 Mass. 476, 480 (2007). “[Ojur duty is to make an independent determination of the correctness of the judge’s application of constitutional principles to the facts as found.” Commonwealth v. Mercado, 422 Mass. 367, 369 (1996). We defer to the motion judge regarding the weight and credibility of the testimony presented at the suppression hearing. See Commonwealth v. Yesilciman, 406 Mass. 736, 743 (1990), and cases cited. The Commonwealth bears the burden of demonstrating that the actions of the police officers in stopping and frisking the defendant were within constitutional limits. See Commonwealth v. DePeiza, supra at 369.
The defendant contends that his motion to suppress should have been allowed because Officer Walsh’s observation of one person holding out his hand to display an unidentified object to another person does not provide the police with the requisite reasonable suspicion of criminal activity to justify a threshold inquiry under Terry v. Ohio, 392 U.S. 1, 21-22 (1968). The defendant points out that the police did not observe anything exchanged between the two men and did not see the object that the defendant was holding. Further, he continues, the officers’ generalized references to guns in the city, without any nexus to the defendant, did not give rise to reasonable concerns for their safety that would justify a patfrisk. Consequently, the defendant claims that the cocaine found at the scene should have been suppressed, as should the cocaine found on his person at the police station because it was “fruit of the poisonous tree.”
“In ‘stop and frisk’ cases our inquiry is two-fold: first, whether the initiation of the investigation by the police was permissible in the circumstances, and, second, whether the scope of the search was justified by the circumstances.” Commonwealth v. Wilson, 441 Mass. 390, 393-394 (2004), quoting Commonwealth v. Silva, 366 Mass. 402, 405 (1974). Both inquiries relate to the reasonableness of the police officer’s conduct under the Fourth [510]*510Amendment and art. 14. See Commonwealth v. Wilson, supra at 394; Commonwealth v. Torres, 433 Mass. 669, 672 (2001).
Before considering whether the officers’ actions in stopping the defendant were constitutionally permissible, we first identify the moment when the seizure occurred. Not every encounter between a law enforcement official and a member of the public constitutes an intrusion of constitutional dimensions that requires justification. See Commonwealth v. Stoute, 422 Mass. 782, 789 (1996). A person is seized by the police only when, in light of the surrounding circumstances, a reasonable person in the situation would not feel free to leave. See id. at 786 (adopting “free to leave” standard of United States v. Mendenhall, 446 U.S. 544, 554 [1980], for purposes of art. 14). See also California v. Hodari D., 499 U.S. 621
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Spina, J.
The defendant was indicted by a Suffolk County grand jury on one charge of possession of a class B controlled substance (cocaine) with intent to distribute, second offense, in [507]*507violation of G. L. c. 94C, § 32A (c) and (d), and one charge of possession with intent to distribute in a school zone, in violation of G. L. c. 94C, § 32J. He filed a motion to suppress the evidence seized from his person on the grounds that he was unlawfully stopped and searched without a warrant in violation of the Fourth and Fourteenth Amendments to the United States Constitution, art. 14 of the Massachusetts Declaration of Rights, and G. L. c. 276.1 After an evidentiary hearing, a judge in the Superior Court denied the motion. Following a jury trial, the defendant was convicted on both indictments. He appealed, and we transferred the case from the Appeals Court on our own motion. The defendant claims, among other issues that we need not reach, that his motion to suppress should have been allowed because the police seized him without reasonable suspicion of criminal activity and pat frisked him without reason to believe that he was armed and dangerous. For the reasons that follow, we now reverse.2
We summarize the facts as found by the motion judge, supplemented by uncontested testimony from the suppression hearing. See Commonwealth v. DePeiza, 449 Mass. 367, 368 (2007). We do not rely on any facts subsequently developed at trial. See Commonwealth v. Deramo, 436 Mass. 40, 43 (2002).
On December 17, 2005, at around 4 a.m., Boston police Officer Greg Walsh was on patrol in a marked cruiser in the vicinity of Tremont and Stuart Streets in downtown Boston. He was familiar with the area as one where he had made several hundred arrests for drug-related offenses and where there had been numerous shootings, including several involving police officers. On this night, Officer Walsh was working with two [508]*508other members of the drug control unit, Detective Guy and Officer Hynes, who were together in another marked cruiser. The three officers, all of whom were in uniform, were driving slowly and watching for possible illicit activities.
At the intersection of Tremont and Stuart Streets, in the heart of the theater district, the police cruisers made a left turn onto Stuart Street, traveling for a short distance on the wrong side of the road. The defendant and Dennis Bates were standing together in the doorway of a building at 71 Stuart Street. Officer Walsh was familiar with the defendant because his booking photograph was posted on a bulletin board in the police station, identifying him as an “impact player” in the Grove Hall area of the Dor-chester section of Boston.3 The photograph included information about the defendant’s arrest on July 12, 2004, for possession of a controlled substance with intent to distribute.
Officer Walsh observed the defendant and Bates engaging in what appeared to be a drug transaction. The defendant was standing in the doorway with his right hand opened flat as if displaying some object or items to Bates, which Officer Walsh could not see. The police cruisers stopped, the officers left their vehicles, and they started to approach the defendant. As they did so, Officer Walsh saw the defendant put his right hand up to his mouth and appear to swallow something. Officer Walsh asked the defendant what he was doing there, and he immediately conducted a patfnsk for weapons. While the defendant was being patted down, a clear plastic bag containing five individually packaged rocks of “crack” cocaine slid out of his pant leg and onto the ground. Officer Walsh arrested the defendant and transported him to the police station for booking. Bates was also pat frisked, checked for outstanding warrants, and then released. During a more thorough search of the defendant at the police station, officers found additional evidence that was indicative of drug dealing.4
When reviewing the denial of a suppression motion, “we [509]*509accept the judge’s subsidiary findings of fact absent clear error, but conduct an independent review of the judge’s ultimate findings and conclusions of law.” Commonwealth v. Washington, 449 Mass. 476, 480 (2007). “[Ojur duty is to make an independent determination of the correctness of the judge’s application of constitutional principles to the facts as found.” Commonwealth v. Mercado, 422 Mass. 367, 369 (1996). We defer to the motion judge regarding the weight and credibility of the testimony presented at the suppression hearing. See Commonwealth v. Yesilciman, 406 Mass. 736, 743 (1990), and cases cited. The Commonwealth bears the burden of demonstrating that the actions of the police officers in stopping and frisking the defendant were within constitutional limits. See Commonwealth v. DePeiza, supra at 369.
The defendant contends that his motion to suppress should have been allowed because Officer Walsh’s observation of one person holding out his hand to display an unidentified object to another person does not provide the police with the requisite reasonable suspicion of criminal activity to justify a threshold inquiry under Terry v. Ohio, 392 U.S. 1, 21-22 (1968). The defendant points out that the police did not observe anything exchanged between the two men and did not see the object that the defendant was holding. Further, he continues, the officers’ generalized references to guns in the city, without any nexus to the defendant, did not give rise to reasonable concerns for their safety that would justify a patfrisk. Consequently, the defendant claims that the cocaine found at the scene should have been suppressed, as should the cocaine found on his person at the police station because it was “fruit of the poisonous tree.”
“In ‘stop and frisk’ cases our inquiry is two-fold: first, whether the initiation of the investigation by the police was permissible in the circumstances, and, second, whether the scope of the search was justified by the circumstances.” Commonwealth v. Wilson, 441 Mass. 390, 393-394 (2004), quoting Commonwealth v. Silva, 366 Mass. 402, 405 (1974). Both inquiries relate to the reasonableness of the police officer’s conduct under the Fourth [510]*510Amendment and art. 14. See Commonwealth v. Wilson, supra at 394; Commonwealth v. Torres, 433 Mass. 669, 672 (2001).
Before considering whether the officers’ actions in stopping the defendant were constitutionally permissible, we first identify the moment when the seizure occurred. Not every encounter between a law enforcement official and a member of the public constitutes an intrusion of constitutional dimensions that requires justification. See Commonwealth v. Stoute, 422 Mass. 782, 789 (1996). A person is seized by the police only when, in light of the surrounding circumstances, a reasonable person in the situation would not feel free to leave. See id. at 786 (adopting “free to leave” standard of United States v. Mendenhall, 446 U.S. 544, 554 [1980], for purposes of art. 14). See also California v. Hodari D., 499 U.S. 621, 624-626 (1991) (stop occurs for Fourth Amendment purposes when police apply physical force or make show of authority to which subject yields).
Here, contrary to the defendant’s contention, he was not seized when the police got out of their vehicles and quickly approached him while he was standing in the doorway of 71 Stuart Street. See Commonwealth v. DePeiza, supra at 370 (no seizure where police stepped out of unmarked vehicle, approached defendant, engaged in short conversation, and accepted his identification when voluntarily offered); Commonwealth v. Pagan, 63 Mass. App. Ct. 780, 782 (2005) (“police officers did not impinge on the defendant’s rights by simply alighting from the police cruiser and approaching him”). There was no evidence that the police had activated their blue lights, see Commonwealth v. Smigliano, 427 Mass. 490, 491-492 (1998), and the mere presence of three police officers was not overwhelming, see Commonwealth v. Pimentel, 27 Mass. App. Ct. 557, 561 (1989). The defendant was seized when, immediately after asking the defendant what he was doing, Officer Walsh conducted a patfnsk. At that moment, a reasonable person would have believed that he was not free to leave. See Commonwealth v. DePeiza, supra at 371; Commonwealth v. Barros, 435 Mass. 171, 174-176 (2001).
Having determined that the defendant was stopped in the constitutional sense, we consider whether the actions of the officers were justified in the circumstances. A police officer may make an investigatory stop “where suspicious conduct gives the officer [511]*511reasonable ground to suspect that a person is committing, has committed, or is about to commit a crime.” Commonwealth v. Wilson, supra. The actions of the officer “must be based on specific and articulable facts and reasonable inferences therefrom, in light of the officer’s experience.” Id. We view the “facts and inferences underlying the officer’s suspicion ... as a whole when assessing the reasonableness of his acts.” Commonwealth v. Thibeau, 384 Mass. 762, 764 (1981). “Seemingly innocent activities taken together can give rise to reasonable suspicion justifying a threshold inquiry.” Commonwealth v. Watson, 430 Mass. 725, 729 (2000). However, reasonable suspicion may not be based merely on good faith or a hunch. See Commonwealth v. Grandison, 433 Mass. 135, 139 (2001).
We agree with the Commonwealth that the motion judge correctly determined that specific and articulable facts supported Officer Walsh’s belief that the defendant was engaged in drug activity. Officer Walsh had significant experience with the drug control unit in downtown Boston, conducting well over 1,000 investigations and making several hundred arrests. See Commonwealth v. DePeiza, supra at 373 (police may rely on experience and training as basis for reasonable suspicion). The neighborhood where the police were patrolling was a high crime area, and it was around 4 a.m. when the events at issue transpired. See Commonwealth v. Thompson, 427 Mass. 729, 734, cert, denied, 525 U.S. 1008 (1998) (presence in high crime area is one factor that, in combination with others, may contribute to reasonable suspicion of criminal activity). Officer Walsh was familiar with the defendant as an individual who previously had been arrested on drug charges. See Commonwealth v. Ciaramitaro, 26 Mass. App. Ct. 110, 115 (1988) (police knowledge of defendants’involvement in past drug activities is factor for consideration in justifying stop). The police observed the defendant displaying items in his hand to Bates and then appearing to swallow those items as the officers approached. That there may be an innocent explanation for the defendant’s actions “does not remove [those actions] from consideration in the reasonable suspicion analysis.” Commonwealth v. DePeiza, supra. See Commonwealth v. Kennedy, 426 Mass. 703, 710-711 (1998) (even though officer did not see what was exchanged, officer’s training, education, and knowledge [512]*512supported reasonable suspicion of drug transaction). Further, Officer Walsh testified that, based on his observations as a police officer, drug dealers and users often ingested drugs to prevent the recovery of evidence. See Commonwealth v. Rivera, 27 Mass. App. Ct. 41, 43-44 (1989) (officer’s observation of person attempting to conceal suspected contraband from police view may justify arrest and search). When the facts and inferences underlying Officer Walsh’s suspicions are viewed in their totality, they constitute more than a mere hunch. We conclude that the seizure of the defendant was a proper investigatory stop based on reasonable suspicion of illegal conduct.
Proceeding to the next step of our analysis, we consider whether the scope of the search was justified by the circumstances. “[A] Terry-type patfrisk incident to the investigatory stop is permissible where the police officer reasonably believes that the individual is armed and dangerous.” Commonwealth v. Wilson, supra. See Terry v. Ohio, 392 U.S. 1, 23-25 (1968). See also Commonwealth v. Mercado, 422 Mass. 367, 371-372 (1996). “While the officer need not be absolutely certain that the individual is armed, the basis for his acts must he in a reasonable belief that his safety or that of others is at stake.” Commonwealth v. Silva, 366 Mass. 402, 406 (1974). As with the initial stop, the officer’s action “must be based on specific and articulable facts and reasonable inferences therefrom, in light of the officer’s experience.” Commonwealth v. Wilson, supra. We caution that while the character of a neighborhood as a “high crime area” can be considered as part of the aggregate circumstances that provide reasonable suspicion to justify a protective frisk, see Commonwealth v. Fisher, 54 Mass. App. Ct. 41, 45 (2002), “this factor must be considered with some caution because many honest, law-abiding citizens live and work in high-crime areas. Those citizens are entitled to the protections of the Federal and State Constitutions, despite the character of the area.” Commonwealth v. Holley, 52 Mass. App. Ct. 659, 663 (2001).
Here, we conclude that the police lacked particular facts from which a reasonable inference could be drawn that the defendant was armed and presented a danger to the officers or others. There was no evidence that the defendant’s criminal history included any weapons-related offenses. See Commonwealth v. [513]*513Dasilva, 66 Mass. App. Ct. 556, 561 (2006) (officers’ knowledge that defendant already charged with crimes involving firearms could be considered in reasonable suspicion analysis); Commonwealth v. Hooker, 52 Mass. App. Ct. 683, 687 (2001) (knowledge of defendant’s prior arrests that did not involve firearms or other weapons was insufficient to create reasonable apprehension of danger to police). Officer Walsh gave no testimony that the police observed anything suggesting that the defendant had a weapon. There was no evidence that the defendant made particular gestures or used any body language that would cause the officers to believe that he was carrying a weapon. Cf. Commonwealth v. DePeiza, supra at 371 (defendant’s walking with right arm held stiff and straight against body suggested he was carrying concealed weapon). Further, there was no evidence that the defendant attempted to flee from the officers when they approached his location. Although the incident at issue occurred around 4 a.m. in a high crime area, Officer Walsh was not alone or outnumbered during his interaction with the defendant where he was accompanied by two other officers, all in uniform, and the defendant’s only companion was Bates. See Commonwealth v. Sumerlin, 393 Mass. 127, 131 (1984), cert, denied, 469 U.S. 1193 (1985) (threat of danger increases where suspects outnumber officers).
Officer Walsh’s general testimony that “[t]here have been shootings downtown,” that “[t]here have been numerous incidents of firearms,” and that he was “familiar with at least four police officer involved shootings in the area,” without more particular facts relating to this defendant and to when those other shootings had occurred, did not give the police the necessary reasonable suspicion to conduct a protective frisk. See generally Commonwealth v. Silva, supra at 408-410 (purpose of Terry-type search is not search for evidence of crime, but protective search for weapons). Contrast Commonwealth v. Fisher, supra at 43-44 (two officers patrolling “high crime area” where “firearm offenses were common” properly conducted protective frisk of individual who, on seeing police, “did a U-turn” and walked away quickly, and who, when police approached to inquire further, made “quick movement into his waist area”). In the circumstances [514]*514here, the degree of police intrusion was not proportionate to the articulable risk to officer safety and, therefore, was constitutionally impermissible. Because the discovery of the cocaine that slid out of the defendant’s pant leg at the scene was the direct result of an unlawful patfrisk, the cocaine subsequently found on his person at the police station, during a search incident to his arrest, must also be suppressed under the “fruit of the poisonous tree” doctrine. See Wong Sun v. United States, 371 U.S. 471, 487-488 (1963); Commonwealth v. Damiano, 444 Mass. 444, 453-454 (2005).5
The order denying the motion to suppress is reversed. This case is remanded to the Superior Court for further proceedings in accordance with this opinion.
So ordered.