N.C. Gen. Stat. § 58-72-70: Person required to approve bond not to be surety.

No member of the board of commissioners, or any other person authorized to take official bonds, shall sign as surety on any official bond upon the sufficiency of which the board of which he is a member may have to pass. (1874-5, c. 120, s. 3; Code, s. 1887; Rev., s. 315; C.S., s. 337.)