John Fiore, 47, was sporting an FBI badge on his waist and telling passersbys he was a federal agent who’d been injured in the line of duty while hanging around Rye Playland on July 4, police said. When two undercover Westchester County cops approached Fiore, he flashed his fed badge, and told the duo that he had been shot in the line of duty, pulling off a knee brace to show them his wound, police said.