>> sandra culbertson arrived here one year ago for aggravated assault. >> i had stabbed this girl with her own knife. me and my mom was going down the road. she cuts in front of me. almost runs me and my mom off the road. her and another girl gets out, comes inside my mom's car, fighting. my mom was screaming. and i thought she was being hit. i was fighting both of them off. apparently when she was swinging, she had a knife. she had dropped the knife at some point and i picked it up and stabbed her. i punctured her lung. at first when all of this happened, i was like, well, it was just a lung. she's got two. what's the big deal? well, the big deal was i could have killed her, by one stab wound. >> culbertson has had some problems in prison as well. she's had numerous disciplinary write-ups, including one that got her fired from her job in the prison kitchen. it started when culbertson suspected another inmate of stealing from her. >> i was fixing her tray, i couldn't get to her and drag her through that little hole so i spit in her tray. wasn't a good idea. so i took and it dumped it o