Cal. Bus. & Prof. Code § 17536.5
If a violation of this chapter is alleged or the application or construction of this chapter is in issue in any proceeding in the Supreme Court of California, a state court of appeal, or the appellate division of a superior court, each person filing any brief or petition with the court in that proceeding shall serve, within three days of filing with the court, a copy of that brief or petition on the Attorney General, directed to the attention of the Consumer Protection Section at a service address designated on the Attorney General's official internet website for service of papers under this section or, if no service address is designated, at the Attorney General's office in the City of San Francisco and on the district attorney of the county in which the lower court action or proceeding was originally filed. Upon the Attorney General's or district attorney's request, each person who has filed any other document, including all or a portion of the appellate record, with the court in addition to a brief or petition shall provide a copy of that document without charge to the Attorney General or the district attorney within five days of the request. The time for service may be extended by the Chief Justice or presiding justice or judge for good cause shown. No judgment or relief, temporary or permanent, shall be granted or opinion issued until proof of service of the petition or brief on the Attorney General and district attorney is filed with the court.
Ca. Bus. and Prof. Code § 17536.5