225 ILCS 412/105
The Department may subpoena and bring before it any person in this State and take the oral or written testimony or compel the production of any books, papers, records, or any other documents that the Secretary or his or her designee deems relevant or material to any investigation or hearing conducted by the Department , with the same fees and mileage and in the same manner as prescribed by law in judicial proceedings in civil cases in circuit courts of this State.
The Secretary, the shorthand court reporter, and hearing officers may administer oaths at any hearing that the Department conducts . Notwithstanding any other statute or Department rule to the contrary, all requests for testimony, production of documents, or records shall be in accordance with this Act.
225 ILCS 412/105