California Code, Public Resources Code - PRC § 42956

(a) Upon approval of an application submitted pursuant to Section 42955, the department shall issue a waste and used tire hauler registration to be carried in the vehicle and a waste and used tire hauler decal to be permanently affixed to the lower right hand corner of the windshield.

(b) Any person who operates a vehicle or who authorizes the operation of a vehicle that transports 10 or more tires without a valid and current waste and used tire hauler registration, as issued by the department pursuant to Section 42955, shall be subject to the enforcement actions specified in Article 4 (commencing with Section 42962).

(c) The waste and used tire hauler registration shall be presented upon demand of an authorized representative of the department.