Wash. Admin. Code § 246-817-210
(2) If the credential has expired for over three years, the practitioner must:
[Statutory Authority: RCW 18.260.120 and 18.32.0365. WSR 08-14-010, § 246-817-210, filed 6/19/08, effective 7/1/08. Statutory Authority: RCW 43.70.280. WSR 98-05-060, § 246-817-210, filed 2/13/98, effective 3/16/98. Statutory Authority: RCW 18.32.035. WSR 95-21-041, § 246-817-210, filed 10/10/95, effective 11/10/95.]