Cal. Veh. Code § 34000

It is the intent of the Legislature to provide additional protection to the public and reduce the risk of possible hazards in the highway transportation of hazardous waste and of flammable and combustible liquids in tank vehicles. It is further the intent of the Legislature that the Department of the California Highway Patrol shall place as a high priority the random inspection of cargo tanks and hazardous waste transport vehicles and containers for compliance with this code.