Cal. Food & Agr. Code § 5342
Plant quarantine officers at plant quarantine inspection stations may ascertain the origin, quantity, and kinds of meat and meat products, poultry and poultry products, eggs, and livestock transported into or out of this state through the stations. The operator of any vehicle which is transporting any such commodity into or out of the state through any plant quarantine inspection station shall stop and give this information upon request to a plant quarantine officer at the plant quarantine inspection station. Such request may be by a sign which is openly displayed at the station or by any other means which is deemed by the director as effective.
The director may accept, on behalf of the state, donations of money from any person to defray the costs of the department under this section. Any such money shall be paid into the State Treasury and credited to the Department of Agriculture Fund. The director may limit expenditures under this section relating to livestock to the amounts so donated for this purpose, and shall limit expenditures under this section relating to poultry and poultry products and eggs to the amounts so donated for this purpose.
Ca. Food and Agric. Code § 5342