As a former 38 year F.O.I.D. card holder living in "The Peoples Republic of Illinois", I can assure you the advice given above it correct and true.
You might want to research what I HEARD from a guy I worked with that CCW'ed in the Peoples Republic. He carried a ccw claiming a loop hole. He was a notary public and as such was an officer of the court. As such, he claimed he was legally allowed to carry a loaded weapon on him.
But like I said, it's all hear say. If you decide to research that, let me know as I'm still curious and glad to have departed there forever.
I think, therefore I am...