Any person other than a witness who is permitted in the grand jury room must first take an oath before the grand jury that he will keep secret all matters before it within his knowledge.
Upon the convening of the investigative grand jury pursuant to approval by the three-judge panel, the district attorney shall subpoena the witnesses. The subpoena shall be served by the investigative grand jury officer, who shall be appointed by the court. The name of the person subpoenaed and the issuance and service of the subpoena shall not be disclosed, except that a witness so subpoenaed may divulge that information. The presiding superior court judge shall hear any matter concerning the investigative grand jury in camera to the extent necessary to prevent disclosure of its existence. The court reporter for the investigative grand jury shall be present and record and transcribe the in camera proceeding. The transcription of any in camera proceeding and a copy of all subpoenas and other process shall be returned to the Chief Justice or to such member of the three-judge panel as the Chief Justice may designate, to be filed with the Clerk of the North Carolina Supreme Court. The subpoena shall otherwise be subject to the provisions of G.S. 15A-801 and Article 43 of Chapter 15A. When an investigative grand jury has completed its investigation of the crimes alleged in the petition, the investigative functions of the grand jury shall be dissolved and such investigation shall cease. The District Attorney shall file a notice of dissolution of the investigative functions of the grand jury with the Clerk of the North Carolina Supreme Court.
N.C. Gen. Stat. § 15A-623