Under the Adam Walsh Child Protection and Safety Act of 2006, states have until next year to establish a tier system for offenders to register for 15 years, 25 years or life, based on the nature of their offenses.

Though the law does not mandate retroactive registration, Tennessee passed a law last July requiring it. The law applies to anyone who has ever been convicted of a sex offense that requires registration, said Kristin Helm of the Tennessee Bureau for Investigation.

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