Debra Baron appeals her conviction of possession with intent to distribute cocaine and conspiracy to do the same. We affirm the conviction but remand for resentencing.
I
BACKGROUND
In June, 1986, during a routine inspection, United Parcel Service employees in Miami, Florida discovered roughly 350 grams of cocaine with an estimated street value of $140,000, along with four stuffed animals, in a package. They gave the package to the police, who forwarded it to the DEA. DEA agents replaced most of the cocaine with a cocaine-substitute, dusted the outside of the plastic bag containing the mixture of cocaine and cocaine-substitute with fluorescent powder, and sewed an electronic beeper tracking device into one of the stuffed animals. They then arranged a controlled delivery of the package to the addressee, Joseph Paliafito, at his ice cream shop in Haleiwa, Hawaii, a small village on the north shore of Oahu.
When the package was delivered to Pal-iafito, he took it to his apartment in a nearby resort complex without opening it. Shortly after he went into his apartment, the beeper signal changed, indicating that the package had been opened. A few minutes later, he emerged from his apartment with a suspiciоus bulge in the leg of his shorts about the size of the plastic bag containing the cocaine-substitute. He walked to the apartment in the next building shared by appellant Baron and her boyfriend and co-defendant Mark Gilliland. Baron and Gilliland promptly accompanied Paliafito back to his apartment. Ten minutes later, Baron and Gilliland emerged onto the porch outside the apartment and stared at the DEA agent who was sitting in a car in the parking lot watching Paliafito’s apartment. Gilliland called to Paliafito, who joined them on the patio and stared at the police. All three then went back into the apartment. Moments later, the electrоnic transmitter stopped beeping, indicating that it had ceased to function, which suggested to the law enforcement officers that it had been destroyed.
A few minutes later, all three left the apartment. Some agents arrested Paliafito while another went to call in information necessary to obtain a warrant to search the apartment. Meanwhile, Baron and Gilli-land were detained for questioning, initially in the parking area and later on the porch outside of Paliafito’s apartment. During the detention, they were ordered not to speak to one another or to touch anything. After about 35 minutes of detention, three DEA agents took Barоn into a bedroom in Paliafito’s apartment and read her the Mi *913 randa warning. The agents then closed the curtains to darken the room and shined a black light on Baron’s hands and arms and the front of her blouse, revealing traces of the fluorescent powder on her hands and blouse.
Baron was then formally “arrested” and taken outside the room while Paliafito and Gilliland were tested with the black light. Agents then brought Baron back into the bedroom to shine the black light on her face and in her mouth, which revealed the fluorescent powder on her chin and upper teeth. Next, the agents searched Paliafi-to’s apartment pursuant to the search warrant they had obtained and found loaded guns, drug paraphernalia, and the plastic bags that the cocaine had been shipped in (which had been rinsed out), but not the cocaine-substitute mixture. The agents then searched the apartment shared by Baron and Gilliland, and found a triple beam scale with residue of Mannitol, a substance commonly used for cutting cocaine. They also found address books containing the address of Gilliland’s brother, Michael, from whose Miami address the UPS package had been sent.
Baron, Paliafito, and Mark and Michael Gilliland were charged in a three-count indictment with conspiracy, using a communication facility (UPS) to facilitate the distribution of cocaine, and possession of cocaine with intent to distribute. Mark Gilliland and Paliafito pleaded guilty. After a motion to suppress the results of the black light test was denied, Michael Gilliland and Baron were tried together. The jury convicted Michael Gilliland on all counts; Baron was acquitted on the communication facility charge, but was convicted on the conspiracy and possession charges. She appeals, raising a plethora of arguments. She challenges, first, the denial of the suppression motion; second, the admission of certain evidence at trial; third, the sufficiency of the evidence linking her to the cocaine; and last, the sentencing judge’s possible reliance on statements in her pre-sentence report which she contends are false. We consider her arguments in that order.
II
SUPPRESSION MOTION
Both Baron and the government pursue alternative theories about why the results of the black light test should or should not have been suppressed. On the one hand, Baron contends that the evidence should have been suppressed because it was the fruit of a de facto arrest unsupported by probable cause. In response, the government argues that Baron was not subject to a de facto arrest at the time of the initial black light search, and that, even if she hаd been, the arrest was supported by probable cause and the black light test was justified as a search incident to a lawful arrest. Alternatively, Baron contends that if she was not under de facto arrest when the black light test was administered, the test was an unlawful search because it was conducted without probable cause and without either a warrant or exigent circumstances. To that line of argument, the government responds that the black light test was not a search within the purview of the Fourth Amendment, and that even if it were, it was proper without a warrant because probable cause and exigent circumstances existed. The first theory requirеs us to decide the somewhat difficult question whether Baron was arrested or subject only to a Terry-stop at the time of the black light examination. The second theory would require us to consider whether a black light examination is a full search within the meaning of the Fourth Amendment, or a slightly lesser search, analogous to the frisk permissible during a Ter ry-stop.
The district court held that Baron was subject to an investigative detention but not an arrest when the first black light test was administered and that the police had reasonable suspicion to detain her but lacked probable cause to arrest her until after the test. The court held that the test results were admissible, however, because the black light test was not a “search” requiring probable cause. We note that the question whether the black light test was a search is a novel question in this *914 circuit, and that the law on the issue is uncertain. 1 We leave that question for another day, however. We affirm the district court’s order denying the suppression motion on the ground that Baron was subject to a de facto arrest rather than an investigative detention at the time the ultraviolet light test was administered, that the arrest was supported by probable cause, and that the test, even if it was a search, was justifiable as a search incident to a lawful arrest.
A. Arrest
There is no “litmus-paper test ... for determining when a seizure exceeds the bounds of an investigative stop.”
Florida v. Royer,
The circumstances of this detention go far beyond any that the Supreme Court has sanctioned under the rubric of an investigative detention. The police ordered Baron not to speak or to touch anything. Having thus effectively silenced and immobilized her, they detained her for 35 to 40 minutes. Finally, after ordering her to move from the public parking area to the porch outside Paliafito’s apartment, they ordered her to go into a-bedroom, where she found herself alone, behind closed doors and obscured windows, with three male police officers.
Had the police moved Baron to a police station or interrogation room, we would clearly be compelled to hold that she was subject to an arrest. In
Florida v. Royer,
a seminal case spelling out when an investigative detention becomes so intrusive as to constitute a de facto arrest, the Supreme Court found particularly significant the fact that the police moved the suspect from an airport concourse to a DEA interrogation room.
In contrast, we have held that a Terry-stop is not transformed into a de facto arrest when a defendant is moved from the street to the back of a police car.
See United States v. Parr,
The distinction between
Dunaway
and
Royer,
on the one hand, and
Parr
and
Buffington,
on the other, lies in the fact that when the police move a suspect from an area open to the public to an enclosed room under police control, the circumstances are deemed to be more coercive than the brief public interview authorized by
Terry v. Ohio,
The principles that we distill from these cases are that the police may move a suspect without exceeding the bounds of the Terry-stop when it is necessary for safety or security reasons,
see Royer,
The encounter plainly became more coercive than the usual
Terry-stop
when the police took Baron into the bedroom and closed the curtains. A young woman shut into a darkened bedroom with three male police officers would doubtless feel a great deal more threatened than if she were standing on the street, or even sitting in the back of a patrol car in public. Isolated alone in a bedroom with police officers, she is likely to feel helpless and at their mercy. We recognized this in
United States v. Moreno.
In that case, as in
Royer,
the defendant was confined alone with several police officers.
In sum, we have a situation where the police, after detaining Baron for 35-40 minutes under an order not to speak to anyone or to touch anything, separated her from her companion, and took her alone into a darkened bedroom for purposes of conducting an investigation. The coereiveness in the totality of these circumstances is so great that we cannot distinguish this detention from a full-scale arrest. 4 We therefore hold that the police effectively arrested Baron for Fourth Amendment purposes when they took her into the bedroom of Paliafito’s apartment.
B. Probable Cause
Having determined that Baron was arrested, we next consider whether the arrest was supported by probable cause. The district court found that there was no probable cause “initially” (presumably the district court meant until after the first black light test revealed fluorescent powder on Baron that gave the police probable cause to believe she was involved in the conspiracy). The government challenges this determination. 5
Probable cause to support a warrantless arrest exists if, at the time of the arrest, the police know sufficient facts to lead a prudent person to believe that the suspect has committed or is committing a crime.
United States v. Smith,
Before taking Baron into the bedroom to administer the black light test — her arrest — the DEA knew the following: They had seen her two days previously leaving Paliafito’s ice cream shop with Mark Gilli-land; Paliafito had gone from the ice cream shop to his apartment immediately after the package was delivered and then promptly to her apartment after opening it; she was with Gilliland whеn he apparently recognized the officers watching Paliafito’s apartment and alerted Paliafito to the fact that they were being watched; and she was in Paliafito’s apartment when the beeper suddenly stopped transmitting, which was right after they apparently realized they were under the watchful eye of the police. Baron contends that these facts are as consistent with her being an innocent bystander — the girlfriend of one conspirator and the neighbor of another — as they are with her being involved in the crime. In support of this characterization of her situation, she notes the proposition stated in
Ybarra v. Illinois,
Although it is a close question, we believe that these facts would lead a prudent person to believe that Baron was probably involved in an illegal conspiracy to possess and distribute the cocaine. The officers had seen Baron associating with Paliafito and Gilliland under circumstances in which she must have known that they were discussing the cocaine and the police surveillance. It is unlikely that Paliafito and Gilli-land would have revealed to her that Pal-iafito had just received a large amount of cоcaine or would have destroyed the electronic transmitter in her presence if she were as naive as she claims. As we have noted, in finding probable cause based on association with persons engaged in criminal activity, a significant consideration “is whether the nature of the criminal activity is such that it could not normally be carried on without the knowledge of all persons present.”
Hillison,
C. Search Incident to an Arrest
The government contends, and the district court agreed, that the black light test of Baron’s hands and shirt was not a search within the meaning of the Fourth Amendment. Baron challenges this determination. As we have noted above,
see supra
at 914 & n. 1, the issue is a difficult one on which courts disagree. We need not decide whether the black light test constituted a search within the meaning of the Fourth Amendment, however, because even assuming it was a search, we uphold the district court’s denial of the suppression motion on the ground that the evidence revealed in the black light test was admissible as the fruit of a search incident to an arrest.
See Smith,
Police may conduct a full search of a person subject to a custodial arrest without either a warrant or probable cause to believe that the search will produce evidence of a crime.
United States v. Robinson,
Ill
EVIDENCE OF OTHER CRIMES
Baron contends that the trial court erred in refusing to strike tеstimony in which a DEA agent referred to evidence found in a search of Paliafito’s apartment that suggested the defendants were involved in large-scale sales of marijuana. 6
The testimony at issue was that of a DEA agent who found plastic bags in Pal-iafito’s apartment that he described as having “an odor of marijuana about them; and my experience as a narcotics investigator, large quantities____” Reporter’s Transcript (“R.T.”) at 84. Defense counsel promptly moved to strike the testimony, but the motion was denied. The witness then continued: “And, in my experience as a narcotics investigator, when I come across large quantities and even what is referred to as $20 bags of marijuana, they have been in this same type of plastic and heat seal.” Id. Defense counsel understandably objected to this gratuitous reference to other crimes; the district court had ruled before trial that evidence of the marijuana-related items found in Paliafito’s apartment, if admissible at all, would be limited to rebuttal. Yet, this testimony was given on direct examination.
Admission of the evidence does not, however, require reversal. Even if the district court erred in declining to strike the testimony, any error was more probably than not harmless.
See United States v. Owens,
IV
SUFFICIENCY OF THE EVIDENCE
Baron next challenges the sufficiency of the evidence to suppоrt her convictions of both conspiracy and possession.
*919
To obtain a conviction for conspiracy, the government must first prove the existence of a conspiracy.
United States v. Penagos,
Baron contends that the evidence is not sufficient fоr a rational trier of fact to find beyond a reasonable doubt that she was more than a bystander, who neither knowingly participated in the conspiracy nor exercised the requisite dominion and control over the cocaine/cocaine-substitute to establish possession. She asserts that her association with Gilliland and Paliafito could be innocent, and that the calls between her phone and Michael Gilliland’s Florida number could have been made by Mark. Similarly, she suggests her possession of an express mail receipt in her handwriting for a package mailed to Michael shortly before the package in question was sent to Paliafito could be evidence only that she had sent something to her boyfriend’s brother, not, as the government portrayed it, that she sent payment for the 350 grams of cocaine that he sent to Paliafito four days later. Further, Baron argues that the fluorescent powder on her hands, blouse and teeth could have been transferred by casual contact with Gilliland, Paliafito, table tops, or door knobs. The jury could, however, find from the evidence as a whole that she was involved in procuring the cocaine, and that she had touched the package and rubbed her finger on her upper gums (the common way to tell whether a substance is in fact cocaine). Moreover, the jury also heard evidence that the plastic bags in which the cocaine had been shipped were found empty and wet in a wastebasket, indicating that they had been rinsed out after the cocaine/cocaine-substitute was dumped. Additionally, the jury could infer from the fact that Baron had fluorescent powder only on the outside of her hands that she had washed out the plastic bags and in doing so had washed off most of the fluorescent powder.
In sum, the case against Baron, viewed in the light most favorable to the government, was more than merely evidence of guilt by association.
Compare Penagos,
Y
SENTENCING
Finally, Baron requests a remand for resentencing. Fed.R.Crim.P. 32(c)(3)(A) requires the sentencing court to permit the defense to read and comment on the pre-sentence report prior to sentencing. If the defensе alleges that the report contains factual inaccuracy, the court must make either a finding on the contested point or a determination that no such finding is necessary and must append any findings it makes to the presentence report. Fed.R. Crim.P. 32(c)(3)(D);
United States v. Edwards,
After reviewing the presentence report, Baron challenged the veracity of statements allegedly made by Paliafito regarding her involvement in the cocaine conspir *920 acy and statements made by her estranged husband regarding her sales of cocaine. In response, the district court stated that:
I’m not going to rely on them as being true. I have no basis for believing it to be true. I see a marriage which is dissolved; the husband, whatever, had reason to say what he wanted to say about someone, and it is not contested. There is a child involved. Any number of things. I have no reason, as I say, to believe any of these Defendants with regard to their accusations against each other, necessarily, except when you put all the pieces together, you can find some parts to be more believable than other parts.
Transcript of Sentencing Hearing at 10-11 (emphasis supplied by Baron). Baron contends that the underscored parts of the district court’s comments show ambiguity about whether the court in fact relied on her estranged husband’s and Paliafito’s statements. The district court did, however, append to the presentence report a copy of the sentencing hearing transcript containing defense counsel’s objections to Paliafito’s and Michael Baron’s statements. Although the court’s statement that it was “not going to rely on [the challenged statements] as being true” suggests that it did not rely on them, the court’s subsequent ambiguous remarks undermine our confidence that the court strictly adhered to the requirements of Fed.R.Crim.P. 32(c)(3)(D). Thus, this case differs from
United States v. Ibarra,
The judgment of conviction is AFFIRMED. The sentence is VACATED and the matter is REMANDED to the district court for resentencing.
Notes
. Two courts have held ultraviolet light tests to be searches within the meaning of the Fourth Amendment.
United States v. Kenaan,
. The question whether Baron was subject to an investigative detention or a full-scale arrest at the time of the first ultraviоlet light test is reviewed de novo.
United States v. Al-Azzawy,
. The government’s reliance on
United States v. Montoya de Hernandez,
.
United States v. Vanichromanee,
. The probable cause determination is a mixed question of law and fact in which the legal issues predominate, and so is reviewed de novo.
United States v. Smith,
. Trial court decisions regarding admission of evidence of other crimes are reviewed for abuse of discretion.
United States v. Feldman,
