it's the cpsu, the central punitive segregation unit. this is where the toughest inmates stay for crimes that range from the most violent, murder, to the more unruly, violating jail orders, such as talking back to staff. >> close 2-7. >> here, inmates are locked in their cells 23 hours a day. >> if i wasn't spiritual, i think i'd probably kill myself. my goal is for the afterlife. i want to go to paradise. other than that, this is terrible. >> what we found, frustration and long periods of confinement can cause inmates to act up. >> inmate's about ready to charge. he was at the cell door with something in his hand this time. you guys ready? going in. >> officers had to restrain the inmate when he refused their orders to come out of his cell. >> cuff him, gentlemen, cuff him. >> watch your back. >> hold him there. >> 6510. >> today, the cpsu still houses the worst of the worst, but due to the re-arrest policy and its consequences, violent outbreaks are almost nonexistent. >> in the past when an inmate committed an infraction in the jail,