(625 ILCS 5/18c-2105) (from Ch. 95 1/2, par. 18c-2105)
    Sec. 18c-2105. Discovery. (1) Discovery Generally. Any party may utilize written interrogatories, depositions, requests for discovery or inspection of documents or property and other discovery tools commonly utilized in civil actions in the circuit courts in the State of Illinois in the manner contemplated by the Code of Civil Procedure and the Rules of the Supreme Court of Illinois; except that discovery must be completed by the 30th day after the party filed its petition for leave to intervene, unless the period of discovery is extended by agreement of the parties or by the Commission. The Chairman or a hearing examiner may, at any time, on his own motion or at the request of a party, issue such rulings denying, limiting, conditioning, or regulating discovery as justice requires, and may supervise all or part of any discovery procedure. Parties to proceedings before the Commission are encouraged to clarify and resolve issues where possible through the use of pre-hearing discovery. However, discovery order should be calculated to lessen the time and expense required to reach an informed resolution of the issues.
    (2) Subpoenas. The Chairman or a hearing examiner may, for good cause, issue a subpoena directing a person to appear and testify, and to produce records, documents, or other papers, at a time and place set forth in the subpoena, in connection with a proceeding before the Commission. Service of the subpoena shall be in the same manner as a subpoena issued by a court. The Commission may, on its own motion or the motion of a person served with a subpoena, quash the subpoena, in whole or in part.
    (3) Appeal from Discovery and Subpoenas. A person served with a discovery request or subpoena may appeal such interlocutory matter to the Commission. Such appeals shall set forth grounds for seeking to quash or limit the scope of the discovery or subpoena, as well as the specific relief sought, and must be filed within 10 days after service of the discovery or subpoena. If discovery is stayed by the Commission, the person served shall be excused from compliance with the discovery order or subpoena until a decision on its appeal is made by the Commission.
    (4) Assessment and Payment of Discovery Costs. The Commission may assess the costs of discovery, including fees for witness attendance and travel, against the party by which discovery was requested. Where a subpoena is issued on the Commission's own motion, fees for witness attendance and travel shall be paid by the Commission on request. Witness fees shall be the same as for a circuit court proceeding. Deposits to insure payment of costs and fees may be required.
    (5) Enforcement of Discovery Procedures. The Commission may, where a person has failed to comply with or permit discovery authorized hereunder, determine any or all issues within the scope of the discovery or subpoena adverse to such person without further evidence. The Commission may, in addition, assess civil penalties under Article VII of Sub-chapter 1 of this Chapter for such violator for contempt and may assess the costs of enforcement, both before the Commission and before the court, against the violator.
(Source: P.A. 84-796.)