lieutenant rodriguez and his igi team hear lots of debriefs at corcoran, few bigger than the one they're about to hear. >> there's an individual who's validated as a mexican mafia member. >> the mexican mafia. you gonna go ahead and try to get someone in his cell and murder him. >> so he raised his hand and he asked for our assistance. so we're going to go there and talk to him about his knowledge and information and gang intelligence he has regarding the mexican mafia. >> the inmate debriefing is none other than notoriously dangerous gang member christian knighten. >> and you're validated as what? >> mexican mafia member. >> can you tell us why you've chose to leave that gang life