The recognition technology was credited with arresting a fake passport this week in the United States at Washington Dulles airport, officials said.
Officials said that on the third day of deployment of the new technology, border guards could discover that the man was using a fake French passport.
US Customs and Border Guard, part of the Department of Homeland Security, said Dulles is one of 14 "early adopter airports" with facial recognition technology for the entry process and began unfolding it Monday.
On Wednesday, a 26-year-old man traveling from Sao Paulo, Brazil, attempted to enter with a French passport but face-to-face biometric sys he found he was no match for the passport he submitted.
A search revealed that his shoe contained the original map of the Republic of the Congo. His name was not published.
The use of face recognition has increased for law enforcement, border control and other applications, even though privacy concerns have been voiced.
Data privacy activists say there are few guarantees for the databases being used that the technology is raising the fear of a "big brother" surveillance state.
These concerns are compounded when studies show facial recognition may not always be accurate, especially for color photographers.
The technology is being introduced globally, with China heavily using law enforcement face recognition  Airport border guards use the biometric system to determine if the person is using a real passport and claim that they use the in-and-out passport Expedited exit process.
The agency also rates the use of biometric technology as part of a process of departure until travelers use biometrics instead of their boarding pass.
The agency said in a release that it has "committed to its data obligations" and published several privacy impact assessments.
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Face detection came into play this year as a suspect arrested for shooting in a newsroom in Annapolis, Maryland , refused to cooperate with him police and could not immediately be identified with the fingerprint. (VOA)