[Mule]

Police in New Orleans once solve the murder of an officer in an afternoon using nothing more than a plastic bag. THey rounded up "the usual suspects," one by one, cuffed them to a chair, asked a question. If they did not percieve the answer to be sufficiently sincere they would slip the plastic bag over the subject's head & allow him some time to reconsider his answer. No bruises just truth. The officers were later tried in a famous case known as the Algiers Seven.