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Except Canadians.

Unless they're NEXUS pass holding Canadians, in which case they have been fingerprinted. I just got fingerprinted this weekend for a NEXUS pass; my fingerprints are apparently "perfect". The US CBP agent taking them advised me not to take up a life of crime, as I would be caught very quickly. Or at least to wear gloves.

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.

And photographed