We have a US Visa and when we went up to Nova Scotia and Newfoundland in '08 we did as we were told (as it's on the back of the card) and gave up our 'white card' that the nice immigration officer at the airport gave us, much to the amusement of the Canadian immigration officer. When we came back down from NS etc. the US immigration office said, "where's your white card", we said, "we gave it up at this border a month ago" and explained what we'd done in accordance to what's on the back of the card. The immigration then said that we'd have to get a new one and we had to fill out new forms and answer a few questions (seperately). This done they stamped our passports, gave us another 6 months and wished us well, very helplful, very friendly, no trouble at all. Just don't be cheeky or try to be clever, tell the truth and smile a lot, it usually works.
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