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I think that only applies to air crossings.

How else are you going to get out of a country surrounded by water?

At least w/ Canada there's an agreement for the Canucks to tell CBR that you've left the US (Source: I tried to surrender my i-94 at the US side of the border. The guy told me to give it to Canadians). Not hard to envision another agreement on the Mexican side

So does the CBP scan being discussed

I guess this is some kind of trial. My point is that exit records are neither novel, useless, nor in most countries the least bit controversial.

Not sure why the US needs to make a big deal out of it with biometric scans instead of the tried-and-true option of a little man in a box stamping your passport.

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