N.C. Gen. Stat. § 81A-79

The provisions of this Article shall not prohibit the user of a scale or weighing device from employing some person other than a scale technician to render service as defined by this Article upon his or her scale or weighing device, nor apply to the person so employed, who does not solicit such employment, provided that said user shall not be relieved of his or her responsibility or liability concerning the accuracy of the scale or weighing device after service has been rendered.