Did 20 months in federal for selling cannabis. Also spent time in solitary. Conditions are far worse than you could imagine. Also, many prisons are functionally solitary so the 4% number is way low.
The economic networks in prisons are wild, and of course there are incentives for guards to participate.
Not only are there massive number of cell phones in prisons, there are cell phones in solitary because the guards smuggle them in.
Capitalism, what a thing, eh?
AMA