225 ILCS 427/27

Any member of the Board, any attorney providing advice to the Board or Department, any person acting as a consultant to the Board or Department, and any witness testifying in a proceeding authorized under this Act, excluding the party making the complaint, shall be immune from liability in any civil action brought for acts occurring while acting in one's capacity as a Board member, attorney, consultant, or witness, respectively, unless the conduct that gave rise to the action was willful or wanton misconduct.