Biometric technologies use unique biological or behavioral attributes—such as DNA, fingerprints, cardiac signatures, voice or gait patterns, and facial or ocular measurements—to authenticate an individual’s identity. Although biometric technologies have been in use for decades, recent advances in artificial intelligence (AI) and Big Data analytics have expanded their application. As these technologies continue to mature and proliferate, largely driven by advances in the commercial sector, they will likely hold growing implications for congressional oversight, civil liberties, U.