why, oh why
do prisoners even have physical access to electricity!
Fair enough, if you want to give them a tv, give them one, but they shouldn't be able to physically access it, they're prisoners not hotel guests! A remote control should be the closest they get, if at all, much better if they have to ask a guard to change channel.
If their human rights absolutely demand that they must have a playstation too, don't let them have physical access to it. Even game stores lock their display machines away in cabinets! Discs are easy to make into weapons, so are mice/controller cables!