California Code, Penal Code - PEN § 290.004

Any person who, since July 1, 1944, has been or hereafter is determined to be a mentally disordered sex offender under Article 1 (commencing with Section 6300) of Chapter 2 of Part 2 of Division 6 of the Welfare and Institutions Code, or any person who has been found guilty in the guilt phase of a trial for an offense for which registration is required by this act but who has been found not guilty by reason of insanity in the sanity phase of the trial shall register in accordance with the act.