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When did they start doing this?

I arrived two weeks ago, no finger print required.

http://www.immihelp.com/visas/usvisit.html

If your canadian, probably not.

They probably already have you fingerprints.

No they do not. I've never been fingerprinted as a Canadian until I got a work visa for the USA. For many Canadians who visit the usa for tourism or similar will never have their fingerprints in a canadian or us database under current laws.

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