The Department of Homeland Security says it expects to use facial recognition technology on 97 percent of departing passengers within the next four years. The system, which involves photographing passengers before they board their flight, first started rolling out in 2017, and was operational in 15 US airports as of the end of 2018.
The facial recognition system works by photographing passengers at their departure gate. It then cross-references this photograph against a library populated with faces images from visa and passport applications, as well as those taken by border agents when foreigners enter the country.
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