Here's the official page for Canada, with the exact conditions and job requirements. http://www.consular.canada.usembassy.gov/nafta.asp http://www.consular.can

Here's the official page for Canada, with the exact conditions and job requirements. http://www.consular.canada.usembassy.gov/nafta.asp http://www.consular.canada.usembassy.gov/nafta.asp It's obtained at the port of entry, so if you're denied, you'll miss your flight. But it seems unproblematic most of the time.