My guess is that it would be legal in IA, I just can't see them making a mistake like that.

And, Zingnut is correct. No bait/corn/mineral/supplements/salt, etc. at any time, in IL. Exceptions are fenced cattle/hog lots and backyard bird,squirrel feeders. You can throw out 1000 trace mineral salt blocks as long as the're in a cattle pasture.

...but you can still buy Deer Cain and similar products.