Interesting situation regarding the application of NAFTA:
http://www.nytimes.com/2017/10/16/us/politics/nafta-united-states-canada.html
Summary:
American company goes into Canada and wants to open a quarry, and makes the application to the Canadian government to do so,
Canadian government reviews the application and rejects it, saying that the quarry "should not be permitted to proceed because it would have a significant and adverse environmental effect on the “community core values” of the [area around the quarry]"
American company goes to NAFTA arbitration panel and complains
NAFTA arbitration panel rules for the American company and against Canada, saying that the "community core values" discriminate against outsiders and can't be used against Americans
NAFTA arbitration decisions cannot be overturned or appealed
American company is now using NAFTA to get $443,000,000 in damages from Canada