California Code, Penal Code - PEN § 1001.75

(a) Any record filed with the Department of Justice shall indicate the disposition in those cases diverted pursuant to this chapter. Upon successful completion of a diversion program, the arrest upon which the diversion was based shall be deemed to have never occurred. The divertee may indicate in response to any question concerning his or her prior criminal record that he or she was not arrested or diverted for that offense, except as specified in subdivision (b). A record pertaining to an arrest resulting in successful completion of a diversion program shall not, without the divertee's consent, be used in any way that would result in the denial of any employment, benefit, license, or certificate.

(b) The divertee shall be advised that, regardless of his or her successful completion of diversion, the arrest upon which the diversion was based may be disclosed by the Department of Justice in response to any peace officer application request and that, notwithstanding subdivision (a), this section does not relieve him or her of the obligation to disclose the arrest in response to any direct question contained in any questionnaire or application for a position as a peace officer, as defined in Section 830.