The only issue on appeal since the Supreme Court assumed the stop and frisk was legal is whether or not the frisking officer acquired probable cause to conduct a full search when he felt the small object in the coat pocket. No, he did not. In this case, the officer determined the lump was contraband only after additional feeling and sliding beyond the scope of the frisk allowed for finding a deadly weapon. Nothing about the lump was immediately apparent as contraband during the initial frisk itself. Containers like crack vials or tinfoil twists meet that description.
Dealers often keep drugs in their underwear in the groin area.
Very small containers felt in the groin area almost never will be noncriminal objects and almost always will be contraband. People do not normally carry small packages in their underpants. The location on the body is inconsistent with a noncriminal explanation. Reasonable suspicion to believe the suspect has, is, or is about to engage in criminal activity supports a stop. Reasonable suspicion to believe the suspect has a weapon and may threaten you supports a frisk.