California Code, Vehicle Code - VEH § 10500

(a) A peace officer, upon receiving a report based on reliable information that a vehicle registered under this code has been stolen, taken, or driven in violation of Section 10851, or that a leased or rented vehicle has not been returned within five days after its owner has made written demand for its return, by certified or registered mail, following the expiration of the lease or rental agreement, or that license plates for a vehicle have been lost or stolen, shall, immediately after receiving that information, report the information to the Department of Justice Stolen Vehicle System.  An officer, upon receiving information of the recovery of a vehicle described in this subdivision, or of the recovery of plates which have been previously reported as lost or stolen, shall immediately report the fact of the recovery to the Department of Justice Stolen Vehicle System.  At the same time, the recovering officer shall advise the Department of Justice Stolen Vehicle System and the original reporting law enforcement agency of the location and condition of the vehicle or license plates recovered.  The original reporting law enforcement agency, upon receipt of the information from the recovering officer, shall immediately attempt to notify the reporting party by telephone, if the telephone number of the reporting party is available or readily accessible, of the location and condition of the recovered vehicle.  If the reporting party's telephone number is unknown, or notification attempts were unsuccessful, the original reporting law enforcement agency shall notify the reporting party by placing, in the mail, a notice providing the location and condition of the recovered vehicle.  This written notice shall be mailed within 24 hours of the original reporting law enforcement agency's receipt of the information of the recovery of the vehicle, excluding holidays and weekends.

(b) If the recovered vehicle is subject to parking or storage charges, Section 10652.5 applies.

(c) This section shall become operative on January 1, 2024.