California Code, Vehicle Code - VEH § 32000.5

(a) A motor carrier who directs the transportation of an explosive and a motor carrier who directs the transportation of a hazardous material, who is required to display placards pursuant to Section 27903, and a motor carrier who transports for a fee in excess of 500 pounds of hazardous materials of the type requiring placards pursuant to Section 27903, shall be licensed in accordance with this code, unless specifically exempted by this code or regulations adopted pursuant to this code. This license shall be available for examination and shall be displayed in accordance with the regulations adopted by the commissioner.

(c) This division does not apply to implements of husbandry, as defined in Section 36000.

(d) This division does not apply to the hauling of division 1.3 explosives classified as special fireworks or to division 1.4 explosives classified as common fireworks by the United States Department of Transportation if those fireworks are transported by a motor carrier under the authority of, and in conformance with, a license issued to the motor carrier by the State Fire Marshal pursuant to Part 2 (commencing with Section 12500) of Division 11 of the Health and Safety Code. In that case, a copy of the license shall be carried in the vehicle and presented to a peace officer upon request.

(f) This section does not prevent the department from issuing a new or initial license to transport hazardous materials to a motor carrier that applies for a license to transport hazardous materials and that, within the previous three years, has been issued an unsatisfactory rating as a result of an inspection conducted pursuant to Section 34501, 34501.12, or 34520, if the motor carrier has corrected the unsatisfactory rating before applying for the license to transport hazardous materials.