An officer observed two men standing on a street corner. One would walk up to a store window, look inside, and return to confer with his companion. This process was repeated about a dozen times. The suspects talked with a third man, then followed him up the street. Thinking the suspects were "casing" the store, the officer confronted the three men and asked their names. The men mumbled a response, at which time the officer spun one of the men, Terry (D), around and patted his breast. He found and removed a pistol. D was charged with carrying a concealed weapon.