https://techcrunch.com/2019/12/02/homeland-security-face-recognition-airport-citizens/

Homeland Security wants to expand facial recognition checks for travelers arriving to and departing from the U.S. to also include citizens, which had previously been exempt from the mandatory checks.

In a filing, the department has proposed that all travelers, and not just foreign nationals or visitors, will have to complete a facial recognition check before they are allowed to enter the U.S., but also to leave the country.