Honestly I'm not surprised it can be used in prisons. I mean, honestly, if they allow you to have cigarettes, hangy lengths of clothing, or booze, they should allow you to "shorten your sentence" with DHMO. I mean, it's not like they give the guys the equipment to handle it properly. At worst it'll lead to a phenomenon similar to that time in prison history when everyone started eating loads of cigarettes in order to go into shock as part of an escape attempt.
Actually, shit. Nevermind... Turns out you actually need to soak the cigs in DHMO and drink it in order to even do the Cigarette trick. Ah well, more Darwin awards I suppose.