Cal. Pub. Util. Code § 99550
The decision of the California Supreme Court in Los Angeles County Transportation Agency v. Richmond (1982), 31 Cal. 3d 197, shall be applicable to and control, and the decision of the California Supreme Court in Rider v. County of San Diego (1991), 1 Cal. 4th 1, shall not be applicable to and shall not control, any action or proceeding wherein the validity of a retail transactions and use tax is contested, questioned, or denied if the ordinance imposing that tax was adopted by a transportation agency and approved prior to December 19, 1991, by a majority of the voters.
For purposes of this section, "transportation agency" means any agency, authority, district, commission, or other public entity organized under provisions of this code and authorized to impose a retail transactions and use tax.
Ca. Pub. Util. Code § 99550