20 ILCS 1605/8
In connection with any hearing held pursuant to Section 7.3 of this Act, the Board, or any Hearing Officer appointed by the Board, may subpoena and compel the appearance of witnesses and production of documents, papers, books, records and other evidence before it in any matter over which it has jurisdiction, control or supervision. The Board, or any appointed Hearing Officer, shall have the power to administer oaths and affirmations to persons whose testimony is required. If a person subpoenaed to attend in any such proceeding or hearing fails to obey the command of the subpoena without reasonable cause, or if a person in attendance in any such proceeding or hearing refuses, without lawful cause, to be examined or to answer a legal or pertinent question or to exhibit any books, account, record or other document when ordered so to do by the Board or its Hearing Officer, the Board or Hearing Officer may apply to the circuit court, upon proof by affidavit of the facts, for an order returnable in not less than 2 nor more than 10 days, or as the court may prescribe, directing such person to show cause before the court why he or she should not comply with such subpoena or such order.
Upon return of the order, the court shall examine such person under oath, and if the court determines, after giving such person an opportunity to be heard, that he or she refused without legal excuse to comply with such subpoena or such order of the Board or Hearing Officer, the court may order such person to comply therewith immediately and any failure to obey the order of the court may be punished as a contempt of court.
All subpoenas and subpoenas duces tecum issued under the provisions of this Act may be served by any person of lawful age. The fees of witnesses for attendance and travel shall be the same as the fees of witnesses before the circuit courts of this State. When the witness is subpoenaed at the instance of the Department or any officer or employee thereof, such fees shall be paid in the same manner as other expenses of the Department. When the witness is subpoenaed at the instance of any other party to any such proceeding, the Department may require that the cost of service of the subpoena or subpoena duces tecum and the fee of the witness be borne by the party at whose instance the witness is summoned. In such case, and on motion of the Department, the Board or its Hearing Officer may require a deposit to cover the cost of such service and witness fees.
The Department, or any officer or employee thereof, or any other party to a hearing before the Board or its Hearing Officers, may cause the depositions of witnesses within the State to be taken in the manner prescribed by law for like depositions in civil actions in courts of this State, and to that end compel the attendance of witnesses and the production of books, papers, records or memoranda.
20 ILCS 1605/8