The fact that face recognition technology, which can be readily abused, has been deployed by federal agencies largely in secret should give us all pause. The technology gives government agencies the unprecedented power to track who we are, where we go, and who we know. Companies marketing this technology to the government boast that it can be used to track people in real-time, reconstruct past movements from video footage, or identify a hundred individuals from a single photo. This threatens to create a world where people are watched and identified as they attend a protest, congregate outside a place of worship, visit a medical provider, or simply go about their daily lives.