49 U.S.C. § 30303

(a) Notification .— A State may become a participating State under this chapter by notifying the Secretary of Transportation of its intention to be bound by section 30304 of this title . (b) Withdrawal .— A participating State may end its status as a participating State by notifying the Secretary of its withdrawal from participation in the National Driver Register. (c) Form and Way of Notification .— Notification by a State under this section shall be made in the form and way the Secretary prescribes by regulation.