California Code, Vehicle Code - VEH § 10856

(a) A person shall not interfere with the transport of a vehicle to a storage facility, auction, or dealer by an individual who is employed by a repossession agency or who is licensed pursuant to Chapter 11 (commencing with Section 7500) of Division 3 of the Business and Professions Code once repossession is complete as provided in Section 7507.12 of the Business and Professions Code.  This subdivision shall not apply to a peace officer while acting in an official capacity.

(b) Any tow yard, impounding agency, or governmental agency, or any person acting on behalf of those entities, shall not refuse to release a vehicle or other collateral to anyone that is legally entitled to that vehicle or other collateral.  This subdivision shall not apply to a vehicle being held for evidence by law enforcement or a prosecuting attorney.