Va. Code Ann. § 19.2-215.10

Upon request by the applicants or upon motion to the presiding judge by special counsel, the Office of Attorney General may participate as special counsel in the multi-jurisdiction grand jury proceedings and any prosecutions arising therefrom. In any prosecution arising out of the multi-jurisdiction grand jury, the attorney for the Commonwealth may also obtain the assistance of the special counsel to the grand jury as a special assistant attorney for the Commonwealth.