California Code, Business and Professions Code - BPC § 492

Notwithstanding any other provision of law, successful completion of any diversion program under the Penal Code, or successful completion of an alcohol and drug problem assessment program under Article 5 (commencing with Section 23249.50) of Chapter 12 of Division 11 of the Vehicle Code, shall not prohibit any agency established under Division 2 (commencing with Section 500) of this code, or any initiative act referred to in that division, from taking disciplinary action against a licensee or from denying a license for professional misconduct, notwithstanding that evidence of that misconduct may be recorded in a record pertaining to an arrest.

This section shall not be construed to apply to any drug diversion program operated by any agency established under Division 2 (commencing with Section 500) of this code, or any initiative act referred to in that division.