It's definitely a real border. Nexus is a frequent traveler program that allows you to go through pre-screening by both border control agencies all at once instead of having to do on site every time you cross. Basically if you can produce a Nexus card they know you already have a passport.
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zvi
(no subject)
Date: 2017-12-10 04:29 pm (UTC)https://www.cbp.gov/travel/trusted-traveler-programs/nexus
It's definitely a real border. Nexus is a frequent traveler program that allows you to go through pre-screening by both border control agencies all at once instead of having to do on site every time you cross. Basically if you can produce a Nexus card they know you already have a passport.