his motion to suppress the in-court identification of him by the station manager. Allison’s attack on the discovery and introduction into evidence of the counterfeit bills rests on three distinct legal theories. First of all, Allison contends that Deputy Collier’s stopping of his vehicle required probable cause and that probable cause can not be based upon double hearsay. Relying upon Aguilar v. Texas, 378 U.S. 108, 84 S.Ct. 1509, 12 L.Ed.2d 723 (1964), Allison argues that Deputy Collier had no personal knowledge of the attempted passing nor did he have information from anyone with such knowledge. Allison’s reliance on Aguilar requisites for valid search warrants is misplaced. A police officer may make an investigative stop of an individual if he reasonably suspects that the individual is involved in criminal activity. Probable cause is not required to justify an investigative stop; reasonable suspicion is sufficient. United States v. Hall, 557 F.2d 1114, 1116 (5th Cir. 1977). Nor was the stop unreasonable simply because Deputy Collier acted on hearsay knowledge. Reasonable suspicion may exist on the collective knowledge of the police when there is reliable communication between the officer supplying the information and the officer acting on that information. See U. S. v. Agostino, 608 F.2d 1035 (5th Cir. 1979); U. S. v. Preston, 608 F.2d 626 (5th Cir. 1979); U. S. v. Ashley, 569 F.2d 975 (5th Cir. 1978); U. S. v. Nieto, 510 F.2d 1118 (5th Cir. 1975); Moreno-Vallejo v. U. S., 414 F.2d 901 (5th Cir. 1969). Here, the information acted upon had been personally given by the manager of the service station to Chief Bernatovitz who in turn accurately transmitted the information to Deputy Collier. Under these circumstances, Deputy Collier had reasonable suspicion to stop the car with the characteristics and occupants fitting the description of that given to him.
Allison next contends that the production of three counterfeit $20.00 ¡bills from his wallet, in response to Deputy Collier’s inquiry, did not give Deputy Collier probable cause to place Allison under arrest. Allison argues that possession of counterfeit bills without more is not a crime and, since Deputy Collier had no firsthand knowledge of Allison’s intent to defraud (by attempting to pass the bills), he therefore had no legally sufficient reason to believe a crime had been committed. Probable cause for an arrest exists “when reasonably trustworthy facts and circumstances are within the knowledge of the arresting officer to warrant a man of reasonable caution in the belief that an offense has been . committed.” U. S. v. Agostino, 608 F.2d 1035, 1037 (5th Cir. 1979) citing Draper v. U. S., 358 U.S. 307, 79 S.Ct. 329, 3 L.Ed.2d 327 (1959). As previously discussed, Deputy Collier’s lack of firsthand knowledge adds nothing to Allison’s argument. Although mere possession of counterfeit money is not a crime, when possession is coupled with reliable information that the possessor has attempted to pass the bill as genuine, the officer in the field is justified in concluding that an offense has been committed. Once Allison exhibited the three counterfeit $20.00 bills, Deputy Collier had probable cause to arrest him.
Lastly, Allison contends that his consent to search the trunk of the automobile was not voluntarily given. Allison asserts that the consent was not voluntary because (1) he was under arrest, (2) he was not informed of his rights to refuse consent to the search, (3) two police vehicles and two arm - ed police officers were present, and (4) he did not aid in the search.
Although Allison also bases his consent issue on his contention that the arrest was illegal, we have held that the arrest was legal and therefore we are not faced with the fruit of the poisonous tree doctrine of Wong Sun v. United States, 371 U.S. 471, 83 S.Ct. 407, 9 L.Ed.2d 441 (1963). Instead, we must look to the totality of the circumstances to determine if the consent was voluntary. Schneckloth v. Bustamonte, 412 U.S. 218, 93 S.Ct. 2041, 36 L.Ed.2d 854 (1973).
Although Allison was under arrest at the time he consented, that, of itself, is not sufficient to establish that his consent was involuntary. U. S. v. Watson, 423 U.S. 411, 96 S.Ct. 820, 46 L.Ed.2d 598 (1976); U.