N.C. Gen. Stat. § 147-7: Traveling expenses on State's business.

When, to efficiently and properly carry into effect and execute any of the duties imposed by his appointment or by the provision of any statute of this State, and provide for the expenses thereof, it is required that any officer of the State or any employee of any department thereof shall travel from place to place, such traveling and other expenses as shall be required shall be approved by said officer or head of the department whose employee incurs such expenses. (1919, c. 117, s. 3; C.S., s. 7631.)