Although many states have had no problem applying their respective sex offender registry laws retroactively, the Maine Supreme Judicial Court is hearing argument on the issue. From the Associated Press:
The Supreme Judicial Court heard appeals Tuesday in two separate cases involving convicted sexual offenders who declined to register as required by a change in state law. Judges sided with the men and ruled that the amended law is unconstitutional, which prompted appeals by the state.
A state prosecutor defended the law, saying it provides an effective tool for protecting potential victims from predators. But the lawyer for one of the offenders says the law makes a mockery of civil rights protections and brands individuals as dangerous when in fact they are not.