The senior resident superior court judge of the district may impanel a second grand jury in any county of the district to serve concurrently with the first. The second grand jury shall be impaneled as provided in the first paragraph of this subsection. The court shall continue to have two grand juries until the senior resident superior court judge orders the second grand jury to terminate.
In any county the senior resident superior court judge, if he finds that grand jury service is placing a disproportionate burden on grand jurors and their employers, may fix the term of service of a grand juror at six months rather than 12 months. In doing so, he shall prescribe procedures, consistent with this section, for replacement of half of the jurors of the grand jury or grand juries approximately every three months.
The affidavit shall be based upon personal knowledge or, if the source of the information and basis for the belief are stated, upon information and belief. The panel's order convening the grand jury as an investigative grand jury shall direct the grand jury to investigate the crimes and persons named in the petition, and shall be filed with the Clerk of the North Carolina Supreme Court. A grand jury so convened retains all powers, duties, and responsibilities of a grand jury under this Article. The contents of the petition and the affidavit shall not be disclosed. Upon receiving a petition under this subsection, the Chief Justice shall appoint a panel to determine whether the grand jury should be convened as an investigative grand jury.
A grand jury authorized by this subsection may be convened from an existing grand jury or grand juries authorized by subsection (b) of this section or may be convened as an additional grand jury to an existing grand jury or grand juries. Notwithstanding subsection (b) of this section, grand jurors impaneled pursuant to this subsection shall serve for a period of 12 months, and, if an additional grand jury is convened, 18 persons shall be selected to constitute that grand jury. At any time for cause shown, the presiding superior court judge may excuse a juror temporarily or permanently, and in the latter event the court may impanel another person in place of the juror excused.
N.C. Gen. Stat. § 15A-622