Then there's this in Illinois:Child endangerment (and manslaughter) charges. So while if you're single, you get to leave loaded guns lying around, if you're a parent it's not so "legal."
"Current Illinois law prohibits the carrying of an immediately accessible or loaded firearm on your person or in your vehicle regardless of whether it is concealed. Anyone having a loaded, accessible gun, even if you have a firearm owner's identification card, is subject to arrest.
On June 4, the Seventh Circuit Court of Appeals extended the time for the current law to remain in place until July 9, or when a new law goes into effect, whichever happens first."