N.C. Gen. Stat. § 147-89: To prosecute cases removed to federal courts.

It shall be the duty of the district attorneys of this State, in whose jurisdiction the circuit and district courts of the United States are held, having first obtained the permission of the judges of said courts, to prosecute, or assist in the prosecution of, all criminal cases in said courts where the defendants are charged with violations of the laws of this State, and have moved their cases from the State to the federal courts under the provisions of the various acts of Congress on such subjects. (1874-5, c. 164, s. 1; Code, s. 1239; Rev., s. 5381; C.S., s. 7696; 1973, c. 47, s. 2.)