Blue Bloods (2010)

S03E21 Devil's Breath

Danny stumbles upon a confused man in the park, drenched in his girlfriend's blood. Doubt creeps in as the man claims he can't remember anything from that night, but the discovery of a potent drug in his system raises questions. Simultaneously, Jamie faces complications after he aids an off-duty cop in hiding his drunken state following an encounter with an armed thief.