The defendant, Mitchell J. Griffin, was charged with possession with intent to distribute cocaine, subsequent offense, G. L. c. 94C, § 32A(d); trafficking in cocaine, G. L. c. 94C, § 32E(¿>)(1); and conspiracy to violate the Controlled Substances Act, G. L. c. 94C, § 40. A judge of the Superior *125Court allowed the defendant’s motion to suppress cocaine seized from a police cruiser in which he had been a passenger. The Commonwealth appeals, arguing that the defendant’s motion to suppress should have been denied because the police had probable cause to search the defendant down to his “last layer of clothing,” and thus could transport him to the police station in order to spare the defendant the humiliation of being subjected to such a search in a public setting. We affirm.
Facts. On March 6, 2009, Investigators Michael Nykorchuck and David Kirchner of the Pittsfield police department learned from a confidential informant (Cl or informant), whose credentials are not being challenged here, that Lawrence Posey would be traveling out of town that evening to buy a kilogram of cocaine and would return to Pittsfield the following day. The Cl believed that Posey’s destination was New York City. The Cl did not provide any information regarding the defendant.
At 5:40 p.m., the investigators saw Posey pumping gasoline at a Shell gasoline station and for the first time saw the defendant sitting in the passenger seat. Investigator Kirchner recognized the defendant from “prior investigations,” the nature of which — victim, witness, or suspect — was not established. The police eventually observed the defendant in Posey’s car as it headed in the direction of New York City.1 Information from the New York State police confirmed that the car was headed in the direction of New York City.
The following day, March 7, 2009, the Cl told Investigator Nykorchuck that he had spoken to Posey, and that Posey would be back sometime after 7:00 p.m. The Cl did not mention anything to the police about the whereabouts, actions, or intentions of the defendant. The police set up surveillance in New York and Massachusetts and observed Posey and the defendant traveling toward the center of Pittsfield.
Once the police identified Posey’s car, Posey was instructed to pull over, which he did without incident. Neither Posey nor the defendant made any suspicious or furtive gestures. Investigator Kirchner removed Posey from the vehicle and another officer apprehended the defendant. The officers were armed, one *126visibly so. Both men were then patted down. No drugs or weapons were found.2 Both men were then handcuffed and read the Miranda rights.
Investigator Kirchner told the defendant that he was not under arrest at that time, although he was handcuffed from behind, but that there was probable cause3 to believe that cocaine was in the vehicle. Investigator Kirchner then informed the defendant that he and Posey would be transported to the police station, along with Posey’s vehicle, where they would be strip searched and a search of the vehicle would be conducted.4 The interaction with the defendant lasted only a few minutes.
The police took Posey and the defendant to the police station in separate cruisers. After dropping off the defendant, Officer Bassi, who had driven the defendant, searched his cruiser for contraband. Nothing was found. In addition, Posey’s car was searched, with the same negative result. Subsequently, the police enlisted the services of a canine unit, and the dog aggressively alerted the police to the front passenger seat of Posey’s car, where the defendant had been seated. The police eventually strip searched both men; this search, like the previous searches, did not produce any contraband. At some point, it is unclear when, Officer Bassi found cocaine in his police cruiser while the car was parked in the parking lot of a local store.5
*127Superior Court decision. On December 16, 2009, a Superior Court judge allowed the defendant’s motion to suppress. In his findings of fact and rulings of law, the judge noted that while there was “probable cause to believe that Posey was in possession of cocaine, and that the cocaine would be found either on his person or in the vehicle ... he was driving, [and there was] also . . . probable cause to arrest Posey,”6 the situation for the defendant was different, as he was “nothing more than a passenger in the vehicle driven by Posey.” There was no information whatsoever about the defendant, other than his being a passenger. Nor did he act in any suspicious manner upon being confronted by the police. As such, the officers were without sufficient justification to arrest the defendant, much less conduct a strip search.7 The judge did note that the police “may have had a reasonable suspicion that the defendant was traveling with Posey in order to assist him in his illicit transactions,” and thus were entitled to conduct the threshold inquiry, but this had revealed nothing. He concluded that, by handcuffing and transporting the defendant “for purposes of conducting an unwarranted strip search,” the officer raised the seizure to an arrest “for which there was no probable cause.” The motion judge ruled that the police exceeded the bounds of an investigatory stop and that any evidence recovered after the initial seizure was the “fruit of the poisonous tree,” citing Wong Sun v. United States, 371 U.S. 471 (1963).
The law. The guiding legal principles are clear and need not be discussed at length. “Probable cause to arrest exists where the facts and circumstances in the arresting officer’s knowledge and of which he or she has reasonably trustworthy information *128are sufficient to warrant a person of reasonable caution in believing that an offense has been or is being committed.” Commonwealth v. Williams, 422 Mass. 111, 119 n.11 (1996).
When there is probable cause to search a car, police are permitted to “inspect [the] passengers’ belongings found in the car that are capable of concealing the object of the search,” Wyoming v. Houghton, 526 U.S. 295, 307 (1999), but this authority does not extend to the search of a person found in that automobile. See id. at 303 n.l (distinguishing between probable cause to search passenger’s purse and probable cause to search passenger). “A person’s proximity, without more, to others independently suspected of criminal activity does not establish probable cause to search that person.” Commonwealth v. Sampson, 20 Mass. App. Ct. 970, 971 (1985). A person is not a container. See Wyoming v. Houghton, 526 U.S. at 308 (Breyer, J., concurring).
Discussion. It appears clear that probable cause existed to stop, seize, and arrest Posey. It follows that the police were also warranted in searching Posey’s car, the accomplishment of which included the demand that the passenger exit the vehicle. Compare Commonwealth v. Correia, 66 Mass. App. Ct. 174, 174 (2006) (odor of burnt marijuana in car entitled police to search interior and to issue exit order to defendant-passenger in order to facilitate search). As for the defendant, the facts known to the police about him at the time of the stop included (1) he had been in Posey’s car the day before, heading to New York City to buy drugs; (2) he was in the same car, still driven by Posey one day later, having returned from New York City after the drug purchase ostensibly had been made; (3) Investigator Kirchner recognized him (in some unclear capacity) from previous investigations; and (4) he made no furtive gestures or suspicious movements upon being stopped.
Armed with this information, the police handcuffed the defendant, read him the Miranda rights, and transported him to the police station for a strip search. We agree with the motion judge’s conclusion that at that point, what had been an investigatory stop was converted into an arrest for which there was no probable cause.8
Even if reasonable suspicion existed to question and conduct *129a pat-down of the defendant, once nothing more was learned or discovered, either on him or in the car, the defendant should not have been further detained. See, e.g., Commonwealth v. Torres, 424 Mass. 153, 159 (1997), quoting from Commonwealth v. Torres, 40 Mass. App. Ct. 6, 9-10 (1996) (“[0]nce any potential threat to the officer’s safety was dispelled and there was no reasonable suspicion that criminal activity [involving the defendant] was afoot, any basis for further detention evaporated”). Compare Commonwealth v. Wing Ng, 420 Mass. 236, 237-238 (1995) (no automatic right to pat frisk companion solely for being in company of one lawfully arrested).
We note that, unlike Commonwealth v. Young, 78 Mass. App. Ct. 548, 555 (2011), wherein the passenger, upon being properly asked to exit the motor vehicle, acted in a suspicious manner, here the defendant did nothing. Moreover, he was never mentioned by the Cl, nor did the Cl ever tell the police that someone would be traveling with Posey. Compare United States v. Di Re, 332 U.S. 581, 594 (1948) (“Any inference that [another] on the scene of a crime is a party to it must disappear if the Government informer singles out the guilty person”); Wyoming v. Houghton, 526 U.S. at 303 & n.l, 307 (reaffirming Di Re, but allowing search of passenger’s possessions).
For the foregoing reasons, the suppression order of the Superior Court is affirmed.9
So ordered.
There is no issue concerning the reliability, veracity, or information supplied by the Cl to the police.
Investigator Nykorchuck, who was then on light duty, was not present when Posey’s vehicle was stopped. Although Nykorchuck knew from his experience that drug dealers hide their product in different places, including their pockets and compartments in the car, he had no prior information from the Cl as to where Posey might be hiding the cocaine or whether Posey might have given the drugs to the defendant, which the investigator believed was possible.
Investigator Kirchner believed he had reason to search the defendant because Kirchner and other officers had observed the defendant leave with Posey for New York City and return in Posey’s vehicle, the Cl had provided information that Posey would be bringing drugs back from New York, and “the fact that [the drugs] could have been easily transferred from . . . Posey to [the defendant].”
Had a strip search been warranted (see note 7, infra), Investigator Kirchner was correct in his belief that the police station would be a safer and more appropriate place to conduct such a search because of the conditions at the location of the stop; the breakdown lane was narrow, the lighting was poor, and another officer had a canine with her, which posed additional safety concerns. Investigator Nykorchuck further testified that protocol precludes officers from performing a strip search on the street.
In response to a question from the judge on the subject, defense counsel *127responded, “Again, I guess we should bring in Officer Bassi that testified [ízc] at some later date, after he dropped Mr. Griffin off at the police station and after he searched his cruiser, he went up to Carr Hardware in the parking lot and then he supposedly found the drugs.” The record also does not indicate the amount of drugs found. During oral argument, defense counsel estimated the weight to be twenty-three grams, considerably less than the expected kilogram of cocaine.
The judge was satisfied that the Cl’s information was sufficient to fulfil both prongs of the Aguilar-Spinelli test. See Commonwealth v. Rosa, 17 Mass. App. Ct. 495, 497 (1984); Commonwealth v. Shea, 28 Mass. App. Ct. 28, 30-31 (1989). The police were also able to corroborate the Cl’s information.
The Commonwealth conceded in its brief the impropriety of the strip search.
After arresting the defendant, the police learned that he and Posey had *129been together the entire time they were in New York and that a canine unit dog reacted to the seat in Posey’s car in which the defendant had been seated.
As there have been no arguments by either party concerning the expectation of privacy one has in the rear seat of a police cruiser, abandonment, or the significance, if any, of where and when the drugs were ultimately discovered, we need not address these issues.