Cal. Government Code § 11400.20

(a) Before, on, or after July 1, 1997, an agency may adopt interim or permanent regulations to govern an adjudicative proceeding under this chapter or Chapter 5 (commencing with Section 11500). Nothing in this section authorizes an agency to adopt regulations to govern an adjudicative proceeding required to be conducted by an administrative law judge employed by the Office of Administrative Hearings, except to the extent the regulations are otherwise authorized by statute. (b) Except as provided in Section 11351: (1) Interim regulations need not comply with Article 5 (commencing with Section 11346) or Article 6 (commencing with Section 11349) of Chapter 3.5, but are governed by Chapter 3.5 (commencing with Section 11340) in all other respects. (2) Interim regulations expire on December 31, 1998, unless earlier terminated or replaced by or readopted as permanent regulations under paragraph (3). If on December 31, 1998, an agency has completed proceedings to replace or readopt interim regulations and has submitted permanent regulations for review by the Office of Administrative Law, but permanent regulations have not yet been filed with the Secretary of State, the interim regulations are extended until the date permanent regulations are filed with the Secretary of State or March 31, 1999, whichever is earlier. (3) Permanent regulations are subject to all the provisions of Chapter 3.5 (commencing with Section 11340), except that if by December 31, 1998, an agency has submitted the regulations for review by the Office of Administrative Law, the regulations are not subject to review for necessity under Section 11349.1 or 11350.