Many people who use the term "stop and frisk" fail to realize that there actually is no such concept in the law, and that the phrase "stop and frisk" couples two constitutionally distinct activities that do not necessarily coincide. This misunderstanding is easily traced to the coincidence in Terry v. Ohio.
Some actions you take have been classified by Supreme Court decisions as requiring that you articulate a "reasonable suspicion" in order to make them constitutionally reasonable, while others can be undertaken only if there is "probable cause" ("PC"). But what do these terms mean? And how do you match the right level of justification with the kind of conduct you're seeking to justify?
Talk to Officer Don Gause, an eight-year veteran of the Myrtle Beach (S.C.) Police Department, and he'll tell you that a needle stick or accidental exposure to HIV, hepatitis, or any other bloodborne pathogen is absolutely his greatest fear.