Wash. Admin. Code § 246-817-315
If requested as part of an investigation authorized by the secretary, a licensed dentist who operates a dental practice in the state of Washington shall provide to the secretary:
(1) Documentation that the licensed dentist is:
[Statutory Authority: RCW 18.32.0365, 18.32.655, and 18.32.002. WSR 16-07-084, § 246-817-315, filed 3/17/16, effective 4/17/16.]