delivered the Opinion of the Court.
Thе prosecution brought an interlocutory appeal pursuant to C.A.R. 4.1, seeking to reverse a suppression order entered by the El Paso County District Court in the prosecution of Ann Jeanette Greer (Greer) for possession of a controlled substance (cocaine). After a hearing, the trial court concluded there was no reasonable suspicion to stoр Greer and suppressed the cocaine. We affirm the trial court’s ruling.
I
Colorado Springs Police Officer Matt Harrell was on duty on December 8, 1992. He was on the roof of the Cloud Nine Bar watching the parking lot and looking for narcotics sales. This location was selected because the Cloud Nine Bar is infamous and well known for narcotic sales. Officer Harrell had made arrests at the Cloud Nine Bar on prior occasions.
While on the roof, Officer Harrell saw Greer get out of a car that had just pulled into the parking lot adjacent to the Cloud Nine Bаr. As Greer stood by the car, three men approached her. One of the men stood face to face with Greer while the other two men stood to the side. Officer Harrell could see Greer’s face, but his view of her body and hands was totally obscured by the back of the man who was facing Greer. Officer Harrell testified that it looked as if Greer was having a conversation with the man who was facing her, but because of his position he could not hear anything that was said. At one point, while Greer was facing the man, Officer Harrell saw Greer bend her left elbow upward. As the man facing Greer turned around to leave, Officer Harrell saw him put currency, consisting of a single bill of unknown denomination, into his pocket. Officer Harrell did not see any exchange take place and could not see if Greer had given the-currency to the man. After the men left, Greer got back into the vehicle that brought her to the parking lot and left the scene.
*530 Officer Harrell concluded from what he had observed that a drug deal had just taken place. He based his conclusion on his thirteen years of experience as a police оfficer; the “unusual” conduct of the parties including the fact that neither Greer nor the men she met came from, or went into, the establishment; the arm movements of Greer; the currency in the hands of the man when he turned around; and the fact that the Cloud Nine Bar was infamous for narcotic sales. As the result of his observations, Officer Harrell radioed nearby uniformed police offiсers and told them to stop the vehicle Greer had entered at the parking lot. The officers contacted by Officer Harrell stoppéd the car, searched Greer, and found cocaine.
II
In the absence of a clear statement that a suppression ruling is grounded on the Colorado Constitution, as opposed to the United States Constitution, we presume that a trial court relied on federal constitutional law in reaching its decision.
People v. McKinstrey,
The only evidence presented at the suppression hearing was the testimony of Officer Harrell. The prosecution asserts the testimony was sufficient to prove that the officer had a reasonably articulable suspicion to believe a drug transaction had occurred. We disagree.
A
The Fourth Amendment to the United States Constitution proteсts against unreasonable searches and seizures.
See, e.g., Minnesota v. Dickerson,
— U.S. —, —,
The exception delineated in
Terry,
and clarified in subsequent cases, is that a police officer can briefly stop a suspicious person and make reasonable inquiries to confirm or dispel his suspicions.
1
Id.
at 30-31,
To determine whether an investigatory stop was based upon a reasonable and articulable suspicion and constitutionally permissible, a trial court must consider the facts and circumstances known to the officer at the time of the encountеr.
People v. Coca,
B
The prosecution рlaces great emphasis on the fact that the Cloud Nine Bar has been the site of drug transactions in the past. In
Rahming,
we stated “[a] history of past criminal activity in a locality does not justify suspension of the constitutional rights of everyone, or anyone, who may subsequently be in that locality.”
Rahming,
Ratcliff involved a police detective who drove by the Cloud Nine Bar in an unmarked vehicle. As the dеtective drove past, he noticed a man, Walker, who was a user and seller of cocaine, standing outside the bar. The detective also knew that Walker was the subject of an оutstanding arrest warrant. The defendant, Ratcliff, came out of the bar and approached Walker who extended his closed hand out to Ratcliff. Ratcliff then put his closed hand out and thе men exchanged what was in their fists. During the exchange, the men remained close to the building, as if they were attempting to shield their conduct from view. The detective made his observations from а distance of twenty to forty feet.
Walker’s and Ratcliff’s conduct, the officer’s knowledge that Walker was a known drug user and dealer, the officer’s knowledge that Walker was the subject of аn arrest warrant, and the bar’s reputation as a locus of drug activity, all led the detective to conclude he had witnessed a drug transaction. In applying the first condition of the three-рart Terry test, we held the detective’s observations and the information known to him immediately prior to the stop provided the detective with a reasonable suspicion that the defendant had engaged in a criminal act. Ratcliff, at 1379.
The facts in this case are distinguishable from the facts in Ratcliff The officer in Ratcliff had a clear view of the suspects'. The officer who observed Greer and the man she spoke with could not see the suspects’ hands. The difference between this case and Ratcliff is also evinced by the fact the detective in Ratcliff was able to describe an exchange where the suspects, immediately upon meeting, held out their fists and then simultaneously opened them. Although the detеctive did not see what was exchanged, he did testify that objects were exchanged. Id. at 1373. In Greer’s case, the only gesture the officer observed was an elbow bending and later a man рutting money in his pocket. An obscured view of a person bending her arm and the subsequent act of a man putting currency in his pocket is not as suspicious as the conduct of the suspects in Ratcliff In addition, the officer in Ratcliff оbserved that the suspects were attempting to shield their actions. What little of Greer’s conduct the officer could see did not indicate any attempt to maintain secrecy or any fear of being observed. More important than a comparison of conduct is the fact that the officer in Ratcliff knew Walker was a drug dealer and user and was wanted by the police. The officer who observed Greer did not know her or any of the men with whom she met. 2
We recognized in
Ratcliff
that the events the officer observed gave rise to a reasonable suspicion, but just barely.
Ratcliff,
Ill
Under the facts of this case, the trial court’s ruling that Officer Harrell did not have a reasonably articulаble suspicion to believe a drug transaction had occurred is supported by the record. We affirm the suppression order and remand for further proceedings consistent with this opiniоn.
Notes
. Colorado has codified the right of an officer to stop a suspect without a warrant. § 16-3-103 8A C.R.S. (1986). In Colorado, an investigatpry stop is sometimes referred to as a
"Stone ”
stop.
See People v. Corpany,
. We recognize an оfficer’s knowledge that one of the parties the officer observes is a drug user is not sufficient, by itself, to constitute a reasonable suspicion.
See Sibron v. New York,
