U.S. Customs and Border Protection (CBP) is set to expand the use of facial recognition tech to identify just about every person leaving the United States on a commercial flight.

As Quartz reports, the CBP already uses facial recognition technology at 15 U.S. airports. The system works by capturing a photo of a passenger as they approach their airport departure gate. The image is then compared to visa and passport applications for a possible match so as to create an “exit record.” No match flags the individual for closer inspection by the CBP.