Mississippi Ping
Even though these registries were in place, they did not help in either the Lundsford or Groene cases.
I haven't heard of any times that they did help.
It's a costly system so I'm wondering if the value is there. It would seem if you took the same resources and effort to increase LE supervision of the more risky perps, more value might result.
I can see one only one possible benefit of the law. If an offender goes off the map/list, then you have a crime committed and can incarcerate again without any other offense required.