self-mutilation. >> i did that scar about ten years ago. i got it from the ankle all the way up to the hip bone, all the way down to the bone and i cut across sideways so the surgeons had to take about 12 hours to sew me up. you got seven layers of skin you got to go through before you get to the bone. and when you're going through one of them phases, you don't even feel the pain. you don't even know you're doing it. >> joe carr is serving an eight-year sentence for robbery. he is taking antipsychotic medication and under staff supervision, he agreed to tell us his story. >> i was anti-sociable. i didn't want to be around nobody. i didn't want nobody around me. i wanted to be by myself. everything made my angry. i would take a lot of it out of myself and then i would feel better. i was cutting myself up every day, every day, every day. so they ended up putting me in the shu for hurting myself. and then my time was up in the