I think SCOTUS punted on this one. IMO anyone who molests kids should be under lifetime sanction and supervision, with hanging by piano wire one treatment option. However, IMO the Megan's Laws are a pretty clear ex post facto sentence - additional sanction imposed by law after conviction - we should change the laws going forward to deal with this problem and not disregard the constitution in doing such. Serious usurpation of rights always starts with actions against undesirables such as pervs and drug addicts - but eventually spreads to all of us.