Sollir Furryfoot
Explorer
Hrm, also, perhaps they have some way of constantly monitoring your brainwave patterns, and then have use of transcendent powers linked to some part of the brain that can be traced. They'd go on an honor system, asking you not to use mental and more subtle powers (or perhaps all powers) unless directed by them, and if the powers are being abused they'd know and could deal with the situation somehow-perhaps restricting the person at first to smaller quarters or the isolation you mentioned.