Botsford, J.
The defendant was charged in the Boston Municipal Court Department with carrying a firearm without a license, in violation of G. L. c. 269, § 10 (a); possession of a firearm without a firearm identification card, in violation of G. L. c. 269, [44]*44§ 10 (h); receiving stolen property, in violation of G. L. c. 266, § 60; and unlawful possession of a class D substance, in violation of G. L. c. 94C, § 34. After a hearing, a judge in that court granted the defendant’s motion to suppress evidence seized from the trunk of the vehicle that the defendant was driving. The judge also suppressed statements made by the defendant after he had been arrested and given his Miranda warnings. A single justice of this court allowed the Commonwealth’s application for interlocutory appeal. The Commonwealth argues that the search was justified by probable cause because the officer detected the odor of burnt marijuana after a valid stop of the car. While we agree that in appropriate circumstances the smell of marijuana can provide probable cause to search all parts of a vehicle, in the circumstances of this case, probable cause to search did not extend to the trunk. Accordingly, we affirm.
1. Background. We recite the facts as they appear in the judge’s memorandum of decision allowing the defendant’s motion to suppress.1 At 7:45 p.m. on October 6, 2005, three Boston police officers, Officers Cogavin, Cooley, and Tarantino, were in the area of Rosewood Street in the Mattapan section of Boston. One hour earlier, Officer Tarantino had received information from a confidential informant concerning shots at a house located a few blocks away, at 590 River Street, at about 6 p.m., and that an individual named “Bubs” was involved in this shooting, and could be found with three other men in a white car. Officer Tarantino passed this information on to Officer Cogavin, who in turn relayed it to Officer Cooley. Some of the officers, including Officer Cooley, knew that the name “Bubs” referred to Leroy Wells, and also knew that Wells had prior firearm arrests and arrests for crimes of violence. The three officers were in the Rosewood Street area checking for suspects connected to the reported 6 p.m. shooting. At about 7:45 p.m., Officer Cooley saw Wells and two other men enter a 2002 black Honda automobile as passengers. Officers Cooley and Cogavin followed the Honda, and determined through a check with the Registry of Motor [45]*45Vehicles that the Honda was owned by a woman named Tykeia Samuels; they also learned that Samuels had a suspended license. Based on this information, and unable to observe the driver of the Honda, the officers stopped the car for a motor vehicle infraction.
The driver’s window of the Honda was open as Officer Cooley approached, and he could see that the driver was a man. The defendant was in the driver’s seat. Officer Cooley approached and spoke to the defendant and as he did so, he saw that Wells was in the front passenger seat. He also noticed the smell of burnt marijuana. According to the judge’s findings, “Cooley did not smell the burned marijuana from within the motor vehicle but only smelled the marijuana coming from the clothes of the occupants of the motor vehicle.” Officer Cooley asked the defendant to get out of the car. The officer feared for his safety — not because of the defendant but because of Wells. Another officer apparently directed Wells to get out of the car also.
The officers conducted patfrisks of both the defendant and Wells; no marijuana, other drugs, or other contraband was found on either man. The officers asked the two passengers in the back seat, both juveniles, to get out of the car.2 Officer Cooley then searched the driver’s side and passenger’s side front seat of the Honda, as well as the back seat. He did not find any marijuana or other contraband.
Officer Cooley asked the defendant if he could look into the trunk; the defendant said no. Nevertheless, Officer Cooley unlocked the trunk, where he discovered three pistols, one of which was protruding from a backpack, as well as two plastic bags of a green leafy substance found in another backpack. All four were placed under arrest and transported to a police station.
Once at the station the defendant was advised of his Miranda rights and signed a Miranda form, and then told Officer Tarantino that the “45” belonged to him.
2. Discussion, a. The stop. “A police officer may stop a vehicle in order to conduct a threshold inquiry if he has a reasonable suspicion that the occupants have committed, are commit[46]*46ting, or are about to commit a crime. His suspicion must be based on specific, articulable facts and reasonable inferences drawn therefrom. A hunch will not suffice.” Commonwealth v. Wren, 391 Mass. 705, 707 (1984), and cases cited. Before the police officers stopped the Honda, they knew that its owner had a suspended license. Because they did not know at that time that the driver of the car was a man, this license information provided a reasonable suspicion to believe that the registered owner of the vehicle was driving with a suspended license.3 See Commonwealth v. Deramo, 436 Mass. 40, 44 (2002) (“the likelihood that the operator is the owner is strong enough to satisfy the reasonable suspicion standard”).
The defendant argues that any justification for the stop evaporated the moment Officer Cooley, in approaching the Honda, observed that the driver of the Honda was a man, and therefore could not be the female owner with the suspended license. We agree that at that moment Officer Cooley no longer had reasonable suspicion that a crime was being committed. An “investigative detention must be temporary and last no longer than reasonably necessary to effectuate the purpose of the stop.” Commonwealth v. Ciaramitaro, 51 Mass. App. Ct. 638, 643 (2001). See Commonwealth v. Feyenord, 445 Mass. 72, 77 (2005), cert. denied, 546 U.S. 1187 (2006). Nevertheless, because the Honda was already legitimately stopped, it was no violation of the defendant’s rights under art. 14 of the Massachusetts Declaration of rights or the Fourth Amendment to the United States Constitution for Officer Cooley to continue walking the remaining distance from the police cruiser to the Honda, even after learning the gender of the driver. At the very least, the officer properly could have taken the opportunity to explain the reason for the stop before allowing the defendant to continue on his way.
[47]*47b. Search of the Honda.4 “In general, a police search or seizure must be supported by a valid warrant. . . . However, it is well settled that, in certain ‘exigent circumstances’ that make obtaining a warrant impracticable ... a search or seizure may be justified by probable cause.” (Citations omitted.) Commonwealth v. Washington, 449 Mass. 476, 480 (2007). The Commonwealth bears the burden of proving “the existence of both probable cause to believe that the automobile contained contraband and of exigent circuiristances to justify proceeding without a warrant.” Commonwealth v. Santiago, 410 Mass. 737, 744 (1991). The exigent circumstance on which the Commonwealth relies is the inherent mobility of an automobile. According to the automobile exception to the warrant requirement, the search of the Honda was justified as long as the officers had probable cause to believe that there was contraband in the car.
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Botsford, J.
The defendant was charged in the Boston Municipal Court Department with carrying a firearm without a license, in violation of G. L. c. 269, § 10 (a); possession of a firearm without a firearm identification card, in violation of G. L. c. 269, [44]*44§ 10 (h); receiving stolen property, in violation of G. L. c. 266, § 60; and unlawful possession of a class D substance, in violation of G. L. c. 94C, § 34. After a hearing, a judge in that court granted the defendant’s motion to suppress evidence seized from the trunk of the vehicle that the defendant was driving. The judge also suppressed statements made by the defendant after he had been arrested and given his Miranda warnings. A single justice of this court allowed the Commonwealth’s application for interlocutory appeal. The Commonwealth argues that the search was justified by probable cause because the officer detected the odor of burnt marijuana after a valid stop of the car. While we agree that in appropriate circumstances the smell of marijuana can provide probable cause to search all parts of a vehicle, in the circumstances of this case, probable cause to search did not extend to the trunk. Accordingly, we affirm.
1. Background. We recite the facts as they appear in the judge’s memorandum of decision allowing the defendant’s motion to suppress.1 At 7:45 p.m. on October 6, 2005, three Boston police officers, Officers Cogavin, Cooley, and Tarantino, were in the area of Rosewood Street in the Mattapan section of Boston. One hour earlier, Officer Tarantino had received information from a confidential informant concerning shots at a house located a few blocks away, at 590 River Street, at about 6 p.m., and that an individual named “Bubs” was involved in this shooting, and could be found with three other men in a white car. Officer Tarantino passed this information on to Officer Cogavin, who in turn relayed it to Officer Cooley. Some of the officers, including Officer Cooley, knew that the name “Bubs” referred to Leroy Wells, and also knew that Wells had prior firearm arrests and arrests for crimes of violence. The three officers were in the Rosewood Street area checking for suspects connected to the reported 6 p.m. shooting. At about 7:45 p.m., Officer Cooley saw Wells and two other men enter a 2002 black Honda automobile as passengers. Officers Cooley and Cogavin followed the Honda, and determined through a check with the Registry of Motor [45]*45Vehicles that the Honda was owned by a woman named Tykeia Samuels; they also learned that Samuels had a suspended license. Based on this information, and unable to observe the driver of the Honda, the officers stopped the car for a motor vehicle infraction.
The driver’s window of the Honda was open as Officer Cooley approached, and he could see that the driver was a man. The defendant was in the driver’s seat. Officer Cooley approached and spoke to the defendant and as he did so, he saw that Wells was in the front passenger seat. He also noticed the smell of burnt marijuana. According to the judge’s findings, “Cooley did not smell the burned marijuana from within the motor vehicle but only smelled the marijuana coming from the clothes of the occupants of the motor vehicle.” Officer Cooley asked the defendant to get out of the car. The officer feared for his safety — not because of the defendant but because of Wells. Another officer apparently directed Wells to get out of the car also.
The officers conducted patfrisks of both the defendant and Wells; no marijuana, other drugs, or other contraband was found on either man. The officers asked the two passengers in the back seat, both juveniles, to get out of the car.2 Officer Cooley then searched the driver’s side and passenger’s side front seat of the Honda, as well as the back seat. He did not find any marijuana or other contraband.
Officer Cooley asked the defendant if he could look into the trunk; the defendant said no. Nevertheless, Officer Cooley unlocked the trunk, where he discovered three pistols, one of which was protruding from a backpack, as well as two plastic bags of a green leafy substance found in another backpack. All four were placed under arrest and transported to a police station.
Once at the station the defendant was advised of his Miranda rights and signed a Miranda form, and then told Officer Tarantino that the “45” belonged to him.
2. Discussion, a. The stop. “A police officer may stop a vehicle in order to conduct a threshold inquiry if he has a reasonable suspicion that the occupants have committed, are commit[46]*46ting, or are about to commit a crime. His suspicion must be based on specific, articulable facts and reasonable inferences drawn therefrom. A hunch will not suffice.” Commonwealth v. Wren, 391 Mass. 705, 707 (1984), and cases cited. Before the police officers stopped the Honda, they knew that its owner had a suspended license. Because they did not know at that time that the driver of the car was a man, this license information provided a reasonable suspicion to believe that the registered owner of the vehicle was driving with a suspended license.3 See Commonwealth v. Deramo, 436 Mass. 40, 44 (2002) (“the likelihood that the operator is the owner is strong enough to satisfy the reasonable suspicion standard”).
The defendant argues that any justification for the stop evaporated the moment Officer Cooley, in approaching the Honda, observed that the driver of the Honda was a man, and therefore could not be the female owner with the suspended license. We agree that at that moment Officer Cooley no longer had reasonable suspicion that a crime was being committed. An “investigative detention must be temporary and last no longer than reasonably necessary to effectuate the purpose of the stop.” Commonwealth v. Ciaramitaro, 51 Mass. App. Ct. 638, 643 (2001). See Commonwealth v. Feyenord, 445 Mass. 72, 77 (2005), cert. denied, 546 U.S. 1187 (2006). Nevertheless, because the Honda was already legitimately stopped, it was no violation of the defendant’s rights under art. 14 of the Massachusetts Declaration of rights or the Fourth Amendment to the United States Constitution for Officer Cooley to continue walking the remaining distance from the police cruiser to the Honda, even after learning the gender of the driver. At the very least, the officer properly could have taken the opportunity to explain the reason for the stop before allowing the defendant to continue on his way.
[47]*47b. Search of the Honda.4 “In general, a police search or seizure must be supported by a valid warrant. . . . However, it is well settled that, in certain ‘exigent circumstances’ that make obtaining a warrant impracticable ... a search or seizure may be justified by probable cause.” (Citations omitted.) Commonwealth v. Washington, 449 Mass. 476, 480 (2007). The Commonwealth bears the burden of proving “the existence of both probable cause to believe that the automobile contained contraband and of exigent circuiristances to justify proceeding without a warrant.” Commonwealth v. Santiago, 410 Mass. 737, 744 (1991). The exigent circumstance on which the Commonwealth relies is the inherent mobility of an automobile. According to the automobile exception to the warrant requirement, the search of the Honda was justified as long as the officers had probable cause to believe that there was contraband in the car. Commonwealth v. Motta, 424 Mass. 117, 123-124 (1997).
“In dealing with probable cause,. . . as the very name implies, we deal with probabilities. These are not technical; they are the factual and practical considerations of everyday life on which reasonable and prudent men, not legal technicians, act.” Commonwealth v. Cast, 407 Mass. 891, 895 (1990), quoting Draper v. United States, 358 U.S. 307, 313 (1959). The particular fact relied on by the police officers in this case was the odor of burnt marijuana coming from the clothes of the passengers in the Honda. We agree that the officers could have reasonably inferred from this fact that evidence of marijuana was likely to be found in the car.5 “[T]he perception by a police officer with training and experience in narcotics detection of ‘a strong, fresh odor of burnt marijuana emerging from a motor vehicle provide[s] probable cause to search the vehicle.’ ” Commonwealth v. Cor-[48]*48reia, 66 Mass. App. Ct. 174, 177 (2006), quoting Commonwealth v. Kitchings, 40 Mass. App. Ct. 591, 596 n.8 (1996). Although the odor of marijuana often has been considered in conjunction with other factors in establishing probable cause,6 we agree with the Appeals Court that the odor of marijuana is sufficiently distinctive that it alone can supply probable cause to believe that marijuana is nearby. See Commonwealth v. Lawrence L., 439 Mass. 817, 823-824 (2003) (detection of strong smell of marijuana on clothes of juvenile while at school provided probable cause to search him); Commonwealth v. Correia, 66 Mass. App. Ct. at 177. See also Johnson v. United States, 333 U.S. 10,13 (1948) (identification of odor sufficiently distinctive to identify controlled substance by one qualified to know odor “might very well be found to be evidence of most persuasive character” to constitute probable cause).7
The defendant argues that the Commonwealth provided no [49]*49evidence that Officer Cooley had sufficient training or expertise to recognize marijuana’s distinctive odor, and that in the absence of such evidence there can be no probable cause. We agree that probable cause to search can be based on the odor of marijuana only when it is detected by an officer with the ability to identify the smell. See, e.g., Johnson v. United States, 333 U.S. at 13 (probable cause may be found “[i]f the presence of odors is testified to before a magistrate and he finds the affiant qualified to know the odor . . .”); Commonwealth v. Correia, 66 Mass. App. Ct. at 177 (probable cause provided by “perception by a police officer with training and experience in narcotics detection”). However, the appropriate opportunity to question the officer’s qualifications in odor detection was during the hearing on the motion to suppress. Included in the judge’s findings was the fact that “Cooley noticed the smell of burned marijuana.” Within this fact is the implicit finding that the judge credited Officer Cooley’s testimony on the subject and believed he was qualified to recognize the odor, and in fact did recognize it.8 Such a conclusion is all the more appropriate here because the judge was careful in his findings to point explicitly to those portions of Officer Cooley’s testimony that he did not credit, and no such disclaimer appears to modify the finding concerning Officer Cooley’s detection of the odor of marijuana.9
c. Scope. Although we conclude that the odor of marijuana [50]*50supplied probable cause for a search of the vehicle, the permissible scope of the search was not limitless. “The scope of a warrantless search of an automobile ... [is defined] by the object of the search and the places in which there is probable cause to believe that it may be found.” Commonwealth v. Cast, 407 Mass. 891, 906 (1990), quoting United States v. Ross, 456 U.S. 798, 824 (1982). For example, “[j]ust as probable cause to believe that a stolen lawnmower may be found in a garage will not support a warrant to search an upstairs bedroom, probable cause to believe that undocumented aliens are being transported in a van will not justify a warrantless search of a suitcase.” United States v. Ross, 456 U.S. at 824.
A search of the passenger compartment of the vehicle was within the permissible scope of the search because any contraband hidden on the passengers’ person easily could have been transferred to a location in the passenger compartment when they were ordered to get out. See Commonwealth v. Cast, 407 Mass. at 902-903 (officers had probable cause to search those places in car where contraband might have been placed while car was out of sight). Cf. Commonwealth v. Moses, 408 Mass. 136, 144 (1990) (officers who observed defendant duck beneath dashboard after his vehicle was stopped could conduct interior search of automobile “confined in scope” to discover any weapon that could have been concealed beneath dashboard). Moreover, the permissible scope of the search in this case extended not only to the passenger compartment of the vehicle, but also to its occupants, particularly in light of the fact, found by the judge, that the smell of marijuana was coming from their clothing. See Commonwealth v. Washington, 449 Mass. 476, 486-487 (2007) (permitting search of passengers after traffic stop based on exigency and probable cause to believe evidence of crime was present; no arrest necessary to justify search); Commonwealth v. Correia, 66 Mass. App. Ct. at 177 (odor of burnt marijuana emanating from vehicle gave probable cause to search vehicle’s occupants as well as vehicle for evidence of marijuana use and [51]*51possession, whether or not police had probable cause to arrest any particular occupant); Commonwealth v. Skea, 18 Mass. App. Ct. 685, 700 (1984) (search of defendant’s person constitutionally justified by “probable cause to believe he carried marihuana or other controlled substances, coupled with exigent circumstances” inherent in unanticipated encounter in parking lot). However, such a search of the occupants of the car, justified by probable cause to search and the exigent circumstances of the unanticipated stop, “must be limited in scope to those areas of the person and his clothing which could reasonably be thought to contain the items sought.” Id. at 701.
The search of the Honda’s trunk in this case exceeded the permissible scope of the search because Officer Cooley could not reasonably have believed that the source of the smell of burnt marijuana would be found in the trunk. Reasonableness is the “ ‘touchstone’ of art. 14 . . . and the Fourth Amendment.” Commonwealth v. Roland R., 448 Mass. 278, 281 (2007). Accordingly, a valid search is limited to “any area, place, or container reasonably capable of containing the object of the search.” Commonwealth v. Signorine, 404 Mass. 400, 405 (1989).
The Commonwealth cites Commonwealth v. Cast, 407 Mass. at 906, in which we held, quoting United States v. Ross, 456 U.S. at 825, that “[i]f probable cause justifies the search of a lawfully stopped vehicle, it justifies the search of every part of the vehicle and its contents that may conceal the object of the search.” The Commonwealth argues that according to this rule, a search of the trunk is permitted whenever officers have probable cause to believe there is contraband in a car. The Commonwealth’s reading is too broad. In Commonwealth v. Cast, supra, law enforcement officers conducting surveillance observed the defendant place a suitcase they thought contained two kilograms of cocaine in the trunk of his rented car in Connecticut. When the officers stopped the defendant hours later as he was driving in the Commonwealth, they conducted a warrantless search of the entire vehicle, in addition to the trunk. The court rejected the defendant’s argument that the officers only had probable cause to search the suitcase, and that for such a search they were required to obtain a warrant rather than rely on the automobile exception to the warrant requirement. Id. at [52]*52901. The court concluded that because on the particular facts of the case the officers did have probable cause to search the entire vehicle for the cocaine, and because exigent circumstances justified application of the automobile exception, the search of the entire car was permissible. Id. at 903-904. Nothing in the Cast case suggests that where automobiles are concerned, the general rule that officers limit their search to those locations where the objects of the search might reasonably be found is somehow suspended.
There is no question that in many cases involving searches of automobiles, probable cause to search extends to every area within the vehicle, including the trunk. The facts of this case, however, require a different conclusion, because the odor detected by the officers was not the odor of raw marijuana, which might reasonably suggest the defendant was engaged in selling or transporting the drug, but rather the odor of burnt marijuana, suggesting that the defendant, or others in the car, had been smoking marijuana in the not too distant past. Simply from detecting the odor of burnt marijuana on the clothes of the car’s occupants — most of whom he had seen enter the car a very short time before — the officer could not reasonably have inferred that burning, recently burned, or even raw marijuana would be found in the trunk.10 Accordingly, the search of the trunk was beyond the scope permitted by art. 14 or the Fourth Amendment.
The court in United States v. Wald, 216 F.3d 1222, 1226 (10th Cir. 2000), provided a reasoned explanation for this conclusion: “This rule is premised on the common-sense proposition that the smell of burnt marijuana is indicative of drug usage, rather than drug trafficking, and because it is unreasonable to believe people smoke marijuana in the trunks of cars, the mere smell of burnt marijuana does not create the fair probability that the trunk contains marijuana.” Accord United States v. Nielsen, 9 F.3d 1487, 1491 (10th Cir. 1993). See State v. Far-[53]*53ris, 109 Ohio St. 3d 519, 530 (2006), cert. denied, 127 S. Ct. 1371 (2007) (odor of burnt marijuana within car does not, standing alone, give probable cause to search trunk).11
Contrary to the dissent’s suggestion, this rule does not require distinguishing between users and dealers of drugs. Rather, it requires distinguishing between contraband that might reasonably be found in a trunk and contraband that would not reasonably be found in a trunk. Had the officers discovered contraband during the search of the passenger compartment or its passengers, even a small amount suggesting personal use, the permissible scope of the search might have extended not only to the passenger compartment of the automobile but also to its trunk. This is because “[i]t is widely accepted that the discovery of some controlled substances gives probable cause to search for additional controlled substances in the vicinity.” Commonwealth v. Skea, 18 Mass. App. Ct. at 690 n.8. See Commonwealth v. Moses, 408 Mass. 136, 144-145 (1990) (discovery of cocaine and loaded handgun during protective search of passengers and passenger compartment supplied probable cause to search entire vehicle, including trunk). But see Commonwealth v. Pena, 69 Mass. App. Ct. 713, 717-718 (2007) (small bag of marijuana found during patfrisk of one passenger did not supply probable cause to search entire car including area under rear seat, because there was no connection between car and passenger’s drugs).
d. Statements. “It is the Commonwealth’s burden to establish that the evidence it has obtained and intends to use is sufficiently attenuated from the underlying illegality so as to be purged from its taint.” Commonwealth v. Damiano, 444 Mass. 444, 454 (2005). The Commonwealth has not suggested any factors that would have attenuated the taint of the illegal search, and argues only that the search of the trunk was valid. Furthermore, it is plain that the defendant’s statement to the police followed directly from his arrest that itself resulted directly [54]*54from the illegal search of the Honda’s trunk. See Commonwealth v. Reyes, 38 Mass. App. Ct. 483, 487-488 (1995), S.C., 423 Mass. 568 (1996).
3. Conclusion. Because the search of the trunk was beyond the scope constitutionally permitted by probable cause on the particular facts found by the motion judge in this case, the evidence found in the trunk must be suppressed. Similarly, the statements made at the police station must be suppressed as tainted fruit of that impermissible search.
Judgment affirmed.