10 ILCS 5/9-18

The Board may hold investigations, inquiries, and hearings concerning any matter covered by this Article, subject to such rules and regulations as the Board may establish. In the process of holding such investigations, inquiries, and hearings, the Board may administer oaths and affirmations, certify to all official acts, issue subpoenas to be authorized by a vote of 5 members of the Board, compel the attendance and testimony of witnesses, and the production of papers, books, accounts, and documents. Hearings conducted by the Board shall be open to the public.