California Code, Vehicle Code - VEH § 2800

(a) It is unlawful to willfully fail or refuse to comply with a lawful order, signal, or direction of a peace officer, as defined in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, when that peace officer is in uniform and is performing duties pursuant to any of the provisions of this code, or to refuse to submit to a lawful inspection pursuant to this code.

(c) It is unlawful to fail or refuse to comply with a lawful out-of-service order issued by the United States Secretary of the Department of Transportation.

(d) “Out-of-Service order” means a declaration by an authorized enforcement officer of a federal, state, Canadian, Mexican, or local jurisdiction that a driver, a commercial motor vehicle, or a motor carrier operation is out-of-service pursuant to Section 386.72, 392.5, 392.9a, 395.13, or 396.9 of Title 49 of the Code of Federal Regulations, state law, or the North American Standard Out-of-Service Criteria.

(e) It is unlawful for a driver of a commercial vehicle subject to inspection under this code to fail to comply with any vehicle inspection testing and associated procedures as required by an authorized member of the California Highway Patrol.