It's an older fic.  Sam is hurt by a group of boys at his school.  I remember some trouble with the local law enforcement department (I believe one of the boys involved is related to the sheriff).  It's discovered later that the boys made a video during the attack on Sam.  Cue angry Dean/John.   I know it's not much to go on, but hopefully it will ring a bell with someone.  Thank you.

FOUND: The fic is Save Me by Jasmineisland for anyone else interested.