. >> the investigation unit is led by retired police officer colonel ken norris. >> we're like an internalffairs unit within this prison. we investigate everything involving the correctional officers as well as the inmates. that's everything from, you know, stealing bacon to murder. >> while a certain percentage of contraband is brought in by prison staff, most comes from prisoner relationships. >> most of the drugs that come through come through by girlfriends, wives, family members. they can bring it in inside their false teeth, bring it in in body cavities. there's all kinds of ways they can bring it in. if the dogs don't hit on it at the gate, then it goes through, and we have no mechanism to stop that. if it's positive, it will be the same color or close to the same color as what you see there on that little package. it will be a red. as soon as she breaks the second ampoule. see that? if we did into the find that, they would have had a very merry christmas and absolutely happy new year. >> coming up, 6,000 inmates trapped in orleans parish prison after katrina hits. >> there were peo