As Johnson stated, they based their initial decisions as to which travelers to approach upon a series of allegedly suspicious characteristics and circumstances, as contained in the now-familiar “drug courier profile,” supplemented by the airport squad’s own prior experiences. It may be fairly said as to all of the officers’ bases of “suspicion” that, although they may indeed be characteristic of those who carry narcotics, they are at least equally, and usually far more frequently, consistent with complete innocence.

Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide …, loc. 862