N.C. Gen. Stat. § 93B-8.2

No occupational licensing board shall contract with or employ a person licensed by the board to serve as an investigator or inspector if the licensee is actively practicing in the profession or occupation and is in competition with other members of the profession or occupation over which the board has jurisdiction. Nothing in this section shall prevent a board from (i) employing licensees who are not otherwise employed in the same profession or occupation as investigators or inspectors or for other purposes or (ii) contracting with licensees of the board to serve as expert witnesses or consultants in cases where special knowledge and experience is required, provided that the board limits the duties and authority of the expert witness or consultant to serving as an information resource to the board and board personnel.