It was the liquor talking
Yet another reason I shouldn't rush to get posts out early in the morning. Of course there's nothing wrong with the prospective application of the AWA. Even assuming it's punitive, there's no more problem with the legislature prospectively imposing the additional sanction of registration and notification than there is with the legislature prospectively increasing the penalty for rape from 10 years to 15 years. D'oh!
There are some other questions raised by Bodyke, though. What happens to charges of violating the notification or registration provisions to people who were reclassified under AWA, if the reclassifications are now invalid? That's a topic we'll addess next week, by which time I'll have hopefully sobered up.