I have a friend in another state whose son was a witness to a murder by one of his so-called friends.  The shooter made my friend's son swear to secracy or he'd shoot him too.  The following morning after the two dumped the body on a backroad side, the kid called his father and told him what happened the night before.  Without hesitation, the father picked his son up and took him to the police station for a statement.  The kid was sentenced to 15 years for being charged with guilty by association.  He was 20 when he went in and 35 when he's released from prison.  I know the family members very well and can attest with certainty that the son didn't have anything to do with the actual murder.