In practical terms, what does this actually mean?<p>I assume that only US entry/exit points "scan" US passports to determine whether a passport is valid or faked etc. (Or maybe European partners do too?)<p>But for entry and exit in most of the world, a foreign passport is just the physical object itself -- a foreign passport may be scanned, but just to record its details for domestic purposes, not to check its authenticity against any kind of international database. I assume that, in most countries, entering on a false foreign passport is a local crime, but do most country's laws or procedures say anything about foreign passports that have been "revoked" by the home country before their expiration date?