Two guns sat on a table at Baltimore Police Headquarters Thursday. One was fake, the other real. Police Commissioner Kevin Davis suggested that members of the press figure out which was which. “Which one’s the replica and which one’s the firearm I think is indicative of the tough, tough job, the tough profession we have out here,” Davis said Thursday. A day before, two Baltimore police officers shot Dedric Colvin, a teenager who police say refused to drop a BB gun that officers believed was the real thing.