[mefdinkins]

Under stop and frisk exception, when someone is 'reasonably stopped' police officers have a right to perform a cursory search, pat down or frisk, of the stopped individual to ensure their own safety. If a police officer reasonably believes that a person is armed/dangerous than they can perform the minor inconvenience of a pat down (without warrant or probable cause). The sole justification for such a search is for the protection of the officer and others nearby, so search must therefore be confined in scope to an intrusion reasonably designed to discover guns/knives/clubs or other dangerous instruments for the assault of a police officer.

If a police officer does a 'stop and frisk' and feels a huge rock of crack cocaine they can't do anything about it because that is outside the scope of what they're looking for under the 'stop and frisk' exception.