In a prosecution for being a felon in possession of a firearm involving circumstances in which defendant was seen by an officer protectively clutching something in his hoodie pocket and then stopped and frisked, a district court's order suppressing the firearm is affirmed where the officer who performed the search at issue failed to comply with the mandate in Terry that there must be reasonable suspicion of on-going criminal activity justifying a stop before a coercive frisk may be constitutionally employed.