California Code, Business and Professions Code - BPC § 12726

(a) If doubt or differences arise as to the accuracy of the weight, measure, or count of any amount or part of any commodity, unladen vehicle, or container for which a weighmaster certificate has been issued, a person having a financial interest may, upon complaint to the department, have the amount, or part thereof, verified by the department or a weighmaster designated by it, upon depositing a sufficient sum of money with the department to defray the actual cost of the verification.

(b) If, when verified, a difference from the original certified weight, measure, or count is discovered as the result of fraud, carelessness, or faulty apparatus, the cost of the verification shall be borne by the weighmaster responsible for the issuance of the erroneous certificate.