i'm jerry. >> juan rubio continues to bide his time in a segregation cell.a mexican mafia housing unit, despite being expelled from the gang. >> what do you do while you're in there? >> i read. work out. think. >> what do you think about? >> my life. how i'm going to fix my life. i get out and i do the same mistakes over and over. i've been doing it all my life. but i'm going to get out. i'm going to get out, and i'm going to change that. >> rubio's latest troubles arrived after he broke one of the mexican mafia's most important codes. he attacked a jail officer. now eight days later -- >> all right, mr. rubio, i'm going to have you have a seat in this chair here. >> -- rubio must face the disciplinary board, who will decide whether or not to give him further sanctions for the assault. >> mr. rubio, how do you plead? >> no contest. >> you do not wish to plead your case whatsoever? >> i didn't do it. that's it. can you tell me who wrote that report, what officers were in there? >> officer martinez wrote the report. captain barabas also followed up on it. >> s