N.C. Gen. Stat. § 119-25

The Secretary of Revenue and the Commissioner of Agriculture, respectively, shall appoint and employ such number of inspectors, clerks and assistants as may be necessary to administer and effectively enforce all the provisions of the gasoline and oil inspection law with the administration or enforcement of which each said Commissioner [or Secretary] is charged. All inspectors shall be bonded in the sum of one thousand dollars ($1,000) in the usual manner provided for the bonding of State employees, and the expense of such bonding shall be paid from the Gasoline and Oil Inspection Fund created by this Article. Each inspector, before entering upon his duties, shall take an oath of office before some person authorized to administer oaths. Any inspector who, while in office, shall be interested directly or indirectly in the manufacture or vending of any illuminating oils or gasoline or other motor fuels shall be guilty of a Class 1 misdemeanor.