California Code, Business and Professions Code - BPC § 2525

(a) It is unlawful for a physician and surgeon who recommends cannabis to a patient for a medical purpose to accept, solicit, or offer any form of remuneration from or to a facility issued a state license pursuant to Division 10 (commencing with Section 26000), if the physician and surgeon or his or her immediate family have a financial interest in that facility.

(b) For the purposes of this section, “financial interest” shall have the same meaning as in Section 650.01.

(c) A violation of this section shall be a misdemeanor punishable by up to one year in county jail and a fine of up to five thousand dollars ($5,000) or by civil penalties of up to five thousand dollars ($5,000) and shall constitute unprofessional conduct.