Every field agent or deputy of the various State departments who is authorized to collect money, audit books, inspect premises of individual or business firms and/or any other field work pertaining to the department which he represents, shall be furnished with an identification card signed by the head of the department represented by him, certifying that the said field agent or deputy has authority to represent the department, and such identification card shall carry a photographic likeness of said representative.
N.C. Gen. Stat. § 128-14