I am pretty sure that in WI they can now pull you over (primary offense) for not wearing a seat belt..........I am not positive, but they either passed the law already, or are planning on it getting passed in the near future (I could swear that I heard something on the news about it recently).
Here is an older article from the JS.......don't have time to do a more detailed search......... This appears as if as of April, nothing had been passed yet. Anyone from WI know for sure what the deal is?
http://www.jsonline.com/news/state/apr03/131800.asp