. >> ernie johnson, serving 26 years for robbery, was sent to ad seg for assaulting another inmate. >> i got into a fight. i have a real problem with child molesters and i don't like them around me. i don't want them near me. i don't even want them in this prison. as far as i'm concerned, they can die. and when they get around me and they start talking and they think it's okay to reveal that they're child molesters, every time they say that, i'm going to smash them. >> seg gates. >> before an inmate is sent to ad seg, he must first serve time in the i-detention unit or idu. in this highly secure cellblock offenders have even fewer privileges and almost no contact with each other. >> kind of like the prisoner jail inside the prison. they're not allowed to have hot pots up here or anything they can cook with. they have limited property they're allowed to have up here. anytime they come out of their cell they have to be restrained behind their back with an escort. the offenders that are up here are the most violent offenders in the prison so at any time, i mean, they might try to reach o