[gcp]

It's been pointed out recently that "near the border" is "100 miles from the border" and the coastline counts as border, so the rules are different for most places in the USA where people actually live.

[falcolas]

IIRC, the border is also defined as any airport which receives international flights.

Of course, in practice the border definition isn't actually used in this fashion (that has been made public), but the potential does seem to exist.