What are the factors used by the police to stop and search the car of a woman in a residential street?

The factors invoked by the police to justify their stop of Bayless vary in their weightiness, that is, their salience to the question whether crime is afoot. Standing alone, some of these factors would be innocuous, and some perhaps even inappropriate. See Brown v. Texas, 443 U.S. 47, 52 (1979) ("The fact that appellant was in a neighborhood frequented by drug users, standing alone, is not a basis for concluding that appellant himself was engaged in criminal conduct."). The final factor -- the strange behavior of the men who loaded the duffel bags into the trunk of her car - however, is itself an appropriate and weighty factor. The speed with which the men loaded the bags into the trunk and dissociated themselves from the car, together with the absence of any communication between the driver and the men, provide a specific basis for the police officers' suspicion that they were witnessing an illicit transaction that the participants did not want to prolong.