I' ll take a pass on the customary WI/IL insults and just stick to the issue at hand.
Is there any solid proof that it spread from WI to IL? No. Deer, unlike vehicles, don' t have lisence plates on their butts.
It is, however, interesting to note that the only place in IL where CWD has been found is just a few miles south of the state line from WI' s CWD zone. Proof? No. A relatively safe guess? Yes. WI' s fault? Absolutely not.
The IDNR did do a good number of testing in several target counties last year, and McHenry, Boone, and Winnebago were the only ones to show positive.
I don' t live in WI, so I feel compelled to keep my opinions of their DNR' s handling of the situation to myself. I' d like to see the IDNR do more about it, but what can they do really? I suspect that if there was actually a course of action out there that had been shown to work, they would implement it here.