Yeah, but (a) they have a copy of the flight manifest so they know you left (if they go to the bother of checking) and (b) CBSA has a record of your entering Canada. Supposedly. And they're supposed to be sharing this information under WHTI but I'm not sure how far they've gotten with it yet.
I know for a fact CBSA doesn't currently have a record of when you left Canada because I got sent to secondary inspection once when I flew to Calgary and they showed me the computer screen and they had zero information, so USCIS apparently doesn't share their entry information with CBSA at the moment.
If you want to get really worried read this: http://www.boingboing.net/2007/12/16/ic ... st-to.html
All because she overstayed B-2 status ten years ago.


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