Cal. Penal Code § 13203

(a) A criminal justice agency may release, within five years of the arrest, information concerning an arrest or detention of a peace officer, as defined in Section 830, an applicant for a position as a peace officer, a nonsworn employee of a criminal justice agency, or an applicant for a nonsworn position within a criminal justice agency that did not result in conviction, and for which the person did not complete a postarrest diversion program, to a governmental agency employer of that employee or applicant.
(b) A criminal justice agency may release information concerning an arrest of a peace officer, as defined in Section 830, an applicant for a position as a peace officer, a nonsworn employee of a criminal justice agency, or an applicant for a nonsworn position within a criminal justice agency that did not result in conviction but for which the person completed a postarrest diversion program or a deferred entry of judgment program, or information concerning a referral to and participation in any postarrest diversion program or a deferred entry of judgment program to a governmental agency employer of that employee or applicant.
(c) Notwithstanding subdivision (a) or (b), a criminal justice agency shall not release information under the following circumstances:
1. (1) Information concerning an arrest for which diversion or deferred entry of judgment has been ordered without attempting to determine whether diversion or a deferred entry of judgment program has been successfully completed.
2. (2) Information concerning an arrest or detention followed by a dismissal or release without attempting to determine whether the individual was exonerated.
3. (3) Information concerning an arrest without a disposition without attempting to determine whether diversion or a deferred entry of judgment program has been successfully completed or the individual was exonerated.