Cal. Welf. & Inst. Code § 14021.33

A regulation or order concerning the Drug Medi-Cal Treatment Program adopted by the State Department of Alcohol and Drug Programs pursuant to former Chapter 3.4 (commencing with Section 11758.40) of Part 1 of Division 10.5 of the Health and Safety Code, as in effect preceding the effective date of the act that added this section, shall remain in effect and shall be fully enforceable, unless and until the readoption, amendment, or repeal of the regulation or order by the department, or until it expires by its own terms.