From the Document: "Law enforcement agencies' use of facial recognition technology (FRT), while not a new practice, has received increased attention from policymakers and the public. In the course of carrying out their duties, federal law enforcement agencies may use FRT for a variety of purposes. [...] This report provides an overview of federal law enforcement agencies' use of FRT, including the current status of scientific standards for its use. The report includes a discussion of how FRT may be used by law enforcement agencies with traditional policing missions as well as by those charged with securing the U.S. borders. It also discusses considerations for policymakers debating whether or how to influence federal, state, and local law enforcement agencies' use of FRT."
CRS Report for Congress, R46586
Congressional Research Service: https://crsreports.congress.gov/