Answers on Quora suggest it's automated, and invisible to most people. https://www.quora.com/Why-does-the-US-not-have-immigration-control-while-departing https

Answers on Quora suggest it's automated, and invisible to most people. https://www.quora.com/Why-does-the-US-not-have-immigration-control-while-departing https://www.quora.com/Why-does-the-US-not-have-immigration-c...