305 ILCS 5/10-13.10: Depositions.

The Illinois Department or any duly authorized officer or employee thereof, or any other party in an investigation or hearing before the Illinois Department, may cause the depositions of witnesses within or without 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.