. >> joseph de la cruz is a gang dropout, serving nine years for attempted murder at california's san quentin state prison. and when we first met him, authorities had just discovered that he had been assaulted inside his protective custody cell. >> this morning you did come out of your cell. we did a sweep to find out how many people stayed behind, and 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. >> they're trying to find out what happened. i won't 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. >> i mean outside of what you're being accused of, being a victim, are you involved in any other batteries in your history? >> no. >> due to this evidence, you're deemed a threat to the safety and security of the institution, to staff, and inmates. >> escort! >> without good information about what prompted the attack and wheth