Lieutenant Hackle was a detective in Internal Affairs. He was assigned to investigate what went wrong during a sting. Hackle was hard on those involved - officers Montoya, Wilkes and Bullock. Faced with conflicting testimonies, he suspected that either one or all was on the take, and suspended them all from duty. Hackle was less than pleased that Montoya went out on her own, but with the money recovered and the gang in custody, Commissioner Gordon closed Hackle's investigation.