N.C. Gen. Stat. § 81A-58
If any product is to be offered for sale, or is sold, and is weighed or measured or counted by any public weighmaster and a certificate is issued prior to sale or acceptance of the product by the purchaser, or if any product is offered for sale, sold or delivered pending the weighing, measuring or counting of the product by any public weighmaster and the issuance of a certificate, the person who is in custody of the product shall keep, protect and prevent any increase or decrease in weight in the time intervening between the weighing and the issuance of the certificate and the sale, and the time intervening between the sale and the presentation of the product to the weighmaster for weighing, measuring or counting and the issuance of a certificate. Any loss sustained in the weight of the product while in custody shall be borne by the custodian.
N.C. Gen. Stat. § 81A-58