https://techcrunch.com/2018/09/25/watchdog-says-face-scanning-at-us-airports-is-plagued-with-technical-problems/

A watchdog report has warned that Homeland Security’s face scanning program, designed to track all departing travelers from the US, is facing “technical and operational challenges” that may not see the system fully working by the time of its estimated completion in 2021.

The report by Homeland Security’s inspector general said that although Customs and Border Protection (CBP) was making “considerable progress” in rolling out the facial scanning technology, the program is dogged with problems.