N.C. Gen. Stat. § 148-33
The Division of Prisons of the Department of Adult Correction may furnish to any of the other State departments, State institutions, or agencies, upon such conditions as may be agreed upon from time to time between the Division and the governing authorities of such Department, institution or agency, prison labor for carrying on any work where it is practical and desirable to use prison labor in the furtherance of the purposes of any State department, institution or agency, and such other employment as is now provided by law for inmates of the State's prison under the provisions of G.S. 148-6: Provided that such prisoners shall at all times be under the custody of and controlled by the duly authorized agent of such Division. Provided, further, that notwithstanding any provisions of law contained in this Article or in this Chapter, no prisoner or group of prisoners may be assigned to work in any building utilized by any State department, agency, or institution unless a duly designated custodial agent of the Secretary of the Department of Adult Correction is assigned to the building to maintain supervision and control of the prisoner or prisoners working there.
N.C. Gen. Stat. § 148-33