The get-tough on crime comically macho idiots are usually the first ones to commit a crime if they were in a circumstance where they needed to and felt they could get away with it. Tablets are really cheap nowadays. My only concern is that the Lithium Ion batteries could be dangerous. I think the highest priority for prison is cameras with audio and night vision capability everywhere inside including aimed at the cell (when they need privacy they could have a small designated area in the cell that is out of the camera field of view. Also, the footage and audio from in-cell cameras should be archived such that only a search warrant issued by a judge can retrieve them. This provides some level of privacy in the cell while being able to investigate inmate on inmate or guard on inmate violence. Prisoners should not have a total expectation of privacy.