I used to have a friend who had done some serious time in several jails. He was a bit of an idiot when he was younger, stole some cars and such, but eventually turned out to be a decent, hardworking guy.
He told me about one particular prison he was in and a guy named "Ox". "Ox" was a great big 7 ft. tall white supremacist who knew half-a-dozen different martial arts. He was in jail for killing several people and was an LWOP, life without parole. "Ox", it turned out, made a good scumbag disposal unit. Whenever a particularly heinous criminal (child killer, child rapist, use your imagination) would come to this jail, the guards would arrange for "Ox" and said scroat to have a special, private shower, which ended with "Ox" killing the scroat with his bare hands and/or teeth.
Afterwards, "Ox" would go to solitary for a day or a week or whatever, and cigarettes would mysteriously appear in his possession when he got out.
I have no idea if it's true or not, but I hope so.