"They stuck me at P.S.A. 7 in the South Bronx," he said, referring to Police Service Area No. 7 in the department’s housing bureau. "They cover all the housing projects in that area." It was dangerous work, performing vertical patrols — marching up and down staircases — watching for drug deals, responding to violent fights and domestic brawls, and worse. Two years passed, and Officer Bolfo brought something else to work, along with his radio and his gun. A camera.