740 ILCS 10/7.6
In the event a witness served with a subpoena by the Attorney General under this Act fails or refuses to obey same or produce documentary material or interrogatory answers as provided herein, or to give testimony, relevant or material, to the investigation being conducted, the Attorney General may petition the Circuit Court of Sangamon or Cook County, or the county wherein the witness resides for an order requiring said witness to attend and testify or produce the documentary material or interrogatory answers demanded. The court's order shall require the witness to attend and testify or produce the documentary material or interrogatory answers, or a combination thereof, by a specified date, and shall further provide a date thereafter on which the witness shall show cause in court why he or she should not be held in contempt of court if he or she fails to comply. The Attorney General shall cause the order to be served upon the witness in the manner provided for service of subpoenas in Section 7.3 of this Act. Service of the order shall constitute service of process, and no other form of process is necessary to submit the witness to the jurisdiction of the court and to require compliance with the court order.
740 ILCS 10/7.6