Air travel already features some attributes of a police state. Metal detectors. Bomb-sniffing dogs. Pat-downs. A gloved TSA agent peering at your toothpaste. But it could get worse. What if your check-in also involved a face recognition scan?
Decades ago, Congress mandated that federal authorities keep track of foreign nationals as they enter and leave the United States. If the government could record when every visitor stepped on and off of U.S. soil, so the thinking went, it could easily see whether a foreign national had overstayed a visa.
But in June of last year, without congressional authorization, and without consulting the public, the Department of Homeland Security started scanning the faces of Americans leaving the country, too.
http://www.slate.com/blogs/future_tense/2017/06/21/dhs_s_biometric_exit_program_is_starting_to_scan_americans_faces_before.html