California Code, Penal Code - PEN § 934

(a) The grand jury may, at all times, request the advice of the court, or the judge thereof, the district attorney, the county counsel, or the Attorney General. Unless advice is requested, the judge of the court, or county counsel as to civil matters, shall not be present during the sessions of the grand jury.

(b) The Attorney General may grant or deny a request for advice from the grand jury. If the Attorney General grants a request for advice from the grand jury, the Attorney General shall fulfill that request within existing financial and staffing resources.