It's funny and all, but you have to work in a real prison. Just like you do in the office. The difference is that by the end of the day you leave the office and enjoy your hard earned money. But when you're working in prison, you are still in prison by the end of the day. And you don't get money, because fuck you, that's why.
About 45% of people in prisons are in on drug charges and 5% are in on immigration charges (according to the Beareu of Prisons). So that's a third to half on BS charges alone since many drug charges are for possession.