I bet they are....bring in a gun that has no paperwork on it..show them your CCW and lose it because you have an unregistered gun.
The Illinois Firearm Owner's Identification card is not a CCW, it is a requirement for the simple ownership of a firearm in Illinois. Illinois residents cannot legally TOUCH a firearm without an FOID.
There is absolutely NO CCW in Illinois, and handguns are completely banned in much of the Chicago area.