California Code, Vehicle Code - VEH § 22850

Whenever an officer or employee removes a vehicle from a highway, or from public or private property, unless otherwise provided, he shall take the vehicle to the nearest garage or other place of safety or to a garage designated or maintained by the governmental agency of which the officer or employee is a member, where the vehicle shall be placed in storage.

At the time of such removal, the officer or employee shall determine the amount of mileage on the vehicle.