225 ILCS 422/150
The Commission has the power to subpoena and to bring before it any person and to take testimony either orally or by deposition, or both, with the same fees and mileage and in the same manner as is prescribed in civil cases in the courts of this State. The Commission and the designated hearing officer have the power to administer oaths to witnesses at any hearing that the Commission is authorized to conduct and any other oaths authorized in any Act administered by the Commission. Any circuit court may, upon application of the Commission or its designee or of the applicant, license holder, or recovery permit holder against whom proceedings under this Act are pending, enter an order requiring the attendance of witnesses and their testimony, and the production of documents, papers, files, books, and records in connection with any hearing or investigation. The court may compel obedience to its order by proceedings for contempt.
225 ILCS 422/150