California Code, Health and Safety Code - HSC § 1649.6

(a) If a federal regulatory agency, the United States Department of Justice (US DOJ), or the federal Centers for Medicare and Medicaid Services (CMS) takes one of the following actions, or makes an inquiry about the health care facility's activities pursuant to Section 1649.2, a health care facility may suspend compliance with Section 1649.2 until the regulatory agency, the US DOJ, or CMS notifies the health care facility that it may resume permitting the use of medicinal cannabis within the facility:

(b) This section does not permit a health care facility to prohibit patient use of medicinal cannabis due solely to the fact that cannabis is a Schedule I drug pursuant to the federal Uniform Controlled Substances Act, or other federal constraints on the use of medicinal cannabis that were in existence prior to the enactment of this chapter.