Facial Recognition Technology for Certain Traveler and Noncitizen Identity Verification [June 29, 2021] [open pdf - 713KB]
From the Document: "Facial recognition technology (FRT), which uses algorithms to compare faces against a collection of known faces, is a biometric tool employed by law enforcement [hyperlink], including U.S. Customs and Border Protection (CBP) officials. FRT can be used to verify the identity of travelers and certain noncitizens awaiting entry. FRT is used in two primary ways:  identification searches, comparing features of a probe [hyperlink] photo with those in a database of images to produce a gallery of potential matches ranked by similarity (not a single affirmative match), and  identity verifications, comparing a probe photo against known photos to produce a binary, match/no match result."
CRS Insight, IN11695
Congressional Research Service: https://crsreports.congress.gov/