Facial Recognition Technology: Federal Law Enforcement Agencies Should Have Better Awareness of Systems Used by Employees, Statement of Gretta L. Goodwin, Director, Homeland Security and Justice, Testimony Before the Subcommittee on Crime, Terrorism, and Homeland Security, Committee on the Judiciary, House of Representatives [open pdf - 2MB]
From the Highlights: "Federal agencies that employ law enforcement officers use facial recognition technology to assist criminal investigations, among other activities. For example, the technology can help identify an unknown individual in a photo or video surveillance. This statement describes (1) the ownership and use of facial recognition technology by federal agencies that employ law enforcement officers, (2) the types of activities these agencies use the technology to support, and (3) the extent that these agencies track employee use of facial recognition technology owned by non-federal entities, including the potential privacy and accuracy implications."
Government Accountability Office: https://www.gao.gov/