Criminalizing potentiality has never been part of our judicial system. Do we want "experts" judging what we might do in terms of "dangerous?" In this and other things we are medievalizing our culture.
This, in spades.
How come a rapist is considered potentially insane, but a guy who messes another guy up with an icepick is perfectly a-ok? Society has far too much of a hang up with ZOMG SEX OFFENDERS for anybody to actually touch this with a spade.
What is the process of this re-evaluation? Is there a court proceeding, where the prisoner gets to have a lawyer and can defend his position, with a presumption of sanity on his side?
What is a sex offender for the purpose of this? Not a joke question, given what the definition of sex offenders is.
Many do not want to call a sex crime a mental illness because it places sexual practices more on a sliding scale from "Normal" to "Criminal/Insane" and many freaky folks wouldn't like being placed close to the "Criminal/Insane" side.
Practically anybody is a freak to someone else.