How Much Information Do Canadian and USA Immigration Share

Question

It’s common knowledge that USA and Canadian immigration are probably the most tightly coupled immigration collaboration in the world.

How much do they really share on applicants, immigrants, border crossers?

PS: The question is not about whether they share information, that’s already settled and might even already have an answer here.

I doubt they’re as tightly coupled as those of the Schengen countries, or the UK and Ireland, or other groups of countries that have open and unpoliced borders between themselves. — Mike Scott, Oct 22 '18 at 10:30

Augustine of Hippo · Accepted Answer · 2019-01-28 13:24:34Z

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Apparently they share almost everything:

answered Oct 21 '18 at 21:15

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A better question would have been how they share information. In the case of USA-Canada, the share based on on biographic AND biometric data. You should assume each country has access to at least all electronically stored immigration and criminal data. – user58558 Oct 22 '18 at 3:48
Note that the document itself says that this is information that "may" be shared. It doesn't say that all of this information is always shared about every person, or is even available for all people. Consider "26. Education". Maybe they have access to your high school diploma and any university degrees you have earned, but how likely are they to specifically know or share that you have been checking out Teach Yourself Gardening books from your local library, or that your grandmother has been teaching you to conjugate Polish verbs? – Robert Columbia Jan 28 '19 at 13:33

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