35 ILCS 120/10

(35 ILCS 120/10) (from Ch. 120, par. 449)

Sec. 10.

The Department or any officer or employee of the Department
designated, in writing, by the Director thereof, shall at its or his or
her own instance, or on the written request of any other party to the proceeding,
issue subpoenas requiring the attendance of and the giving of testimony by
witnesses, and subpoenas duces tecum requiring the production of books,
papers, records or memoranda. All subpoenas and subpoenas duces tecum
issued under the terms of this Act may be served by any person of full age.
The fees of witnesses for attendance and travel shall be the same as the
fees of witnesses before the circuit court of this State; such fees to be
paid when the witness is excused from further attendance. 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, and 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, the Department, in its discretion, may require a deposit to
cover the cost of such service and witness fees. A subpoena or subpoena
duces tecum issued as aforesaid shall be served in the same manner as a
subpoena issued out of a court.

Any circuit court of this State, upon the
application of the Department or any officer or employee thereof, or upon
the application of any other party to the proceeding, may, in its
discretion, compel the attendance of witnesses, the production of books,
papers, records or memoranda and the giving of testimony before the
Department or any officer or employee thereof conducting an investigation
or holding a hearing authorized by this Act, by an attachment for contempt,
or otherwise, in the same manner as production of evidence may be compelled
before the court.

The Department or any officer or employee thereof, or any other party in
an investigation or hearing before the Department, 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.

(Source: P.A. 83-334.)