Section 8-117. Rules of Procedure

The commission shall adopt rules providing
  for  hearing  and pre-hearing procedure. These rules shall include rules
  providing that the commission, by its prosecutorial bureau, shall  be  a
  party  to  all complaints and that a complainant shall be a party if the
  complainant has intervened in the manner set forth in the rules  of  the
  commission.  These  rules  shall also include rules governing discovery,
  motion practice and the issuance of subpoenas. Wherever  necessary,  the
  commission  shall  issue orders compelling discovery. In accordance with
  the commission's discovery rules,  any  party  from  whom  discovery  is
  sought  may  assert an objection to such discovery based upon a claim of
  privilege or other defense and  the  commission  shall  rule  upon  such
  objection.