you no good mother [ bleep ]. >> duane harper is a person that sometimes don't think before he reactstold you now. >> harper's current release date from segregation is in 2009. >> if you talk to a lot of cats that really, really know me, they'll tell you that i overreact. i let my anger and my, you know, things get to me that i shouldn't have, and as a result of that, i'm still here. >>> when we return -- >> i'm not going to live with child molesters. i'm not going to live with punks. i'm not going to live with rats. i'm not going to live with that kind of people, because i have a choice, because i have nothing to lose. >> we meet some of the castle's most notorious and violent inmates. >>> and later -- >> you've got a lot of time to examine yourself, think about the things that you've done, think about the opportunities you had in life and squandered them. >> voices from death row. ...which helped students and teachers get better results in ap courses. together, they raised ap test scores 138%. just imagine our potential... ...if the other states joined them. let's raise our scores.

>> when we first met harper he was serving his third year in administrative segregation or solitary confinement for having assaulted correctional officers. >> in my opinion, duanereally stressed out individual. >> don't just strip me out for talking. strip everybody out for talking you [ bleep ]. >> shortly after "lockup" and if you back up, you're a too much, especially when multigrain cheerios thought they were dead. [ laughter ] [ grunting ] huh? [ male announcer ] should've used roundup. america's number one weed killer. it kills weeds to the root, so they don't come back. guaranteed. weeds won't play dead, they'll stay dead. roundup. no root. no weed. no problem. >>> here's what's happening. john edwards former mistress has written a tell-all book about her affair with the former senator. it is set to be released june 26th. it's expected to include revealing details about their relationship which began while edward was still married. >> connecticut is now the 17th state to allow the use of medical marijuana. doctors will able to prescribe the drug to patients who suffer from illnesses like cancer and ms.  >>> due to mature subj