Cal. VEH § 22651.5

(a) Any peace officer, as defined in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, or any regularly employed and salaried employee who is engaged in directing traffic or enforcing parking laws or regulations, may, upon the complaint of any person, remove a vehicle parked within 500 feet of any occupied building of a school, community college, or university during normal hours of operation, or a vehicle parked within a residence or business district, from a highway or from public or private property, if an alarm device or horn has been activated within the vehicle, whether continuously activated or intermittently and repeatedly activated, the peace officer or designated employee is unable to locate the owner of the vehicle within 20 minutes from the time of arrival at the vehicle’s location, and the alarm device or horn has not been completely silenced prior to removal.

(b) Upon removal of a vehicle from a highway or from public or private property pursuant to this section, the peace officer or designated employee ordering the removal shall immediately report the removal and the location to which the vehicle is removed to the Stolen Vehicle System of the Department of Justice.