A scene from "The Alibi Witness," a 1958 episode of M Squad
, one of TV's greatest cop shows of the '50s. Chicago Det. Lt. Frank Ballinger (Lee Marvin) carefully examines a damning piece of murder case evidence: a wooden t-square! Meanwhile, his deadpan voice-over narration explains, "The unlocked door... the money packed in a bag... blood on a broken t-square. The man had been dead for days."
