CA Gov't Code Section 19635

No adverse action shall be valid against any state employee for any cause for discipline based on any civil service law of this state, unless notice of the adverse action is served within three years after the cause for discipline, upon which the notice is based, first arose. Adverse action based on fraud, embezzlement, or the falsification of records shall be valid, if notice of the adverse action is served within three years after the discovery of the fraud, embezzlement, or falsification.