found that the officers in this case made "permissible deductions" from the known facts and had a "legitimate basis for suspicion." Based on their familiarity with the area and on their two-month period of observation, the officers concluded that "Chevron" had a regular pattern of operations. Based on this pattern, it is "not surprising that when [the officers] stopped the vehicle on its return trip it contained 'Chevron' and several illegal aliens." The Chief Justice praised the officers' work, writing, "We see here the kind of police work often suggested by judges and scholars as examples of appropriate and reasonable means of law enforcement." In a concurrence, Justice Stewart highlighted the facts of the case, writing, "this nocturnal round trip into desolate desert terrain" was "in any event ... puzzling," but "coming when and as it did, surely the most likely explanation for it was that Chevron was again shepherding aliens." Justice Marshall concurred without opinion. See also List of United States Supreme Court cases List of United States Supreme Court cases, volume 449 References External links 1981 in United States case law United States Supreme Court cases United States Supreme Court cases of the Burger Court