N.C. Gen. Stat. § 6-50: Imprisonment of prosecuting witness for willful nonpayment of costs if prosecution frivolous.

Every such prosecuting witness may be adjudged not only to pay the costs, but he shall also be imprisoned for the willful nonpayment thereof, when the judge before whom the case was tried shall adjudge that the prosecution was frivolous or malicious. (1800, c. 558; R.C., c. 35, s. 37; 1879, c. 49; 1881, c. 176; Code, s. 738; Rev., s. 1297; C.S., s. 1272; 1971, c. 269, s. 11.1.)