N.C. Gen. Stat. § 133-30

Noncollusion affidavits may be required by rule of any governmental agency from all prime bidders. Any such requirement shall be set forth in the invitation to bid. Failure of any bidder to provide a required affidavit to the governmental agency shall be grounds for disqualification of his bid. The provisions of this section are in addition to and not in derogation of any other powers and authority of any governmental agency.