This debate comes up nearly every year. The DNR has told me in the past, and lcornice can correct me if worng, that an easy rule of thumb to use is does it have food of any sort in the product ingredients? If so, other than salt or minerals, of course, then its illegal. However, the DNR CO I talked to also told me if it has artificial flavoring in it, it's not illegal. For instance, apple or corn flavoring would be legal, but real apples or corn, whether it be chunks or juice or whatever, makes it illegal. Bottom line is the smell test, if it feels wrong, it probably is. Personally, I haven't seen salt or minerals be enough of a draw during hunting season to enhance your chances of sucess. Deer use my mineral lick regularly during the summer and fall months, but that means once every day or two whenever they happen to be passing through. Nowhere near the same consistency as a food source like a crop field and rarely during the fall.