https://techcrunch.com/2019/12/05/homeland-security-drops-airport-citizens-face-scans/

Homeland Security has confirmed it will not expand face recognition scans to U.S. citizens arriving and departing the country, days after it emerged the agency proposed making the scans for citizens mandatory.

The department, whose responsibility is border protection and immigration checks, said in a government filing that it it wanted to “amend the regulations to provide that all travelers, including U.S. citizens, may be required to be photographed upon entry and/or departure.”