An Arizona HVAC worker noticed that someone attempted to steal a spool of copper off his work truck. He found the large spool about 20 ft away along with a severed finger.
Police took the finger for prints and tracked down the man it belonged to and took him into custody. The man posted photos on instagram and claimed to have lost it working on a car...until the police showed him the finger in their evidence locker.
(The following link has the full story and pictures of the finger if you're into that sort of thing.)