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The law allowing for a sex offender to be civilly committed to a mental institution as a danger to others and to be held there indefinitely has been challenged numerous times and withstood Constitutional scrutiny. But this appears to be changing.
A Federal court has indeed very recently ruled on a Minnesota case and held that such detention is unconstitutional. You can read an article about that case here. This will give many sex offenders similarly committed an opportunity to appeal and reenter society.