one thing we learned about prison, doesn't matter where you're housed, your safety is never guaranteed. >> we believe you may have been a victim of a battery. >> joseph de la cruz is a gang dropout, serving nine years for attempted murder at california san quentin state prison. when we first met him, authorities had just discovered that he had been assaulted inside his protective custody cell. >> this morning, you come out of your cell, we did a sweep to find out how many people stayed behind. you were discovered with injuries. and here's the medical report. >> despite obvious injuries, de la cruz refused to give correctional staff any information about the attack. >> we're trying to find out who -- i want to tell them what happened. >> any specific individuals you know are your enemies? >> no, sir. >> how about any prison weapons offenses? >> no, sir. >> do you belong to a gang? >> no, i don't. >> aside from what you're being accused of being a victim, are you involved in any other batteries in your history? >> no.