34 U.S.C. § 20918

Periodic in person verification

A sex offender shall appear in person, allow the jurisdiction to take a current photograph, and verify the information in each registry in which that offender is required to be registered not less frequently than—

(1)

each year, if the offender is a tier I sex offender;

(2)

every 6 months, if the offender is a tier II sex offender; and

(3)

every 3 months, if the offender is a tier III sex offender.

( Pub. L. 109–248, title I, § 116 , July 27, 2006 , 120 Stat. 595 .)