CA Veh Code Section 15027

(a)

This compact shall become effective as to any state in which this compact becomes effective as the law of that state.

(b)

Any party state may withdraw from this compact by enacting a statute repealing this compact as the law of that state, but no such withdrawal shall take effect until six months after the executive head of the withdrawing state has given notice of the withdrawal to the executive heads of all other party states. No withdrawal shall affect the validity or applicability by the licensing authorities of states remaining party to the compact of any report of conviction occurring prior to the withdrawal.