Cal. Business and Professions Code § 24202

(a) All state and local law enforcement agencies shall immediately notify the department of any arrests made by them for violations over which the department has jurisdiction which involve a licensee or licensed premises. Notice shall be given within 10 days of the arrest. The department shall promptly cause an investigation to be made as to whether grounds exist for suspension or revocation of the license or licenses of the licensee. (b) The department may not open or add an entry to a file or initiate an investigation of a licensee or suspend or revoke a license (1) solely because the licensee or an agent acting on behalf of the licensee has reported to a state or local law enforcement agency that suspected controlled substance violations have taken place on the licensed premises or (2) solely based on activities constituting violations described in such a report, unless the violations reported occurred with the actual knowledge and willful consent of the licensee.