Posted: Mon Sep 15, 2008 10:06 am-
You're not barred from anything, in fact there is caselaw saying that a Canadian citizen who merely overstays in B-2 status (providing they maintained that status) cannot be denied re-entry merely for that. (And of course if you lied about how long you were going to stay and it wasn't merely an innocent mistake and they can prove it, no court is going to look upon that favourably, I would think).
However USCIS probably aren't that familiar with the caselaw.
Basically they only let you in for six months, and if you say: "I want to stay seven months" they probably won't let you in, but if you do overstay and then try to re-enter, LEGALLY there is nothing they can do about it but that doesn't mean they won't (unless of course you show up with a knowledgeable immigration lawyer at the POE, which I'm guessing you won't).
At the moment it's not a terribly big deal, because they only started writing down everything you say at the POE in January of this year, they're in the process of building RFID checks at the POEs so they know when you leave, but going back to 2006 all they have is the date you entered when they swiped your passport. They don't know when you left, short of a full-scale investigation.
So really it boils down to the questions they ask when you enter.
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Steve.