If that showdown comes to pass, a resident of a non-complying state could not use a driver's license to enter a federal courthouse or a Social Security Administration building nor could he board a plane without undergoing a pat-down search, possibly creating massive backlogs at the nation's airports and almost certainly leading to a flurry of federal lawsuits.
By Ryan Singel
Full Story: http://blog.wired.com/27bstroke6/2008/01/montana-governo.html