When a person has a complaint against a police department employee (sworn or civilian), the complaint may be filed in person, by telephone or by completing the Citizen Commendation/Complaint Form (PDF) and sending it to the Department.
Illinois law (50 ILCS 725/3.8(b)) requires that anyone filing a complaint against a sworn police officer must have the complaint supported by a sworn affidavit. This can be done by using a notary public.