Thousands of facial-recognition requests, internal documents and emails over the past five years, obtained through public-records requests by researchers with Georgetown Law’s Center on Privacy and Technology and provided to The Washington Post, reveal that federal investigators have turned state departments of motor vehicles databases into the bedrock of an unprecedented surveillance infrastructure.

Police have long had access to fingerprints, DNA and other “biometric data” taken from criminal suspects. But the DMV records contain the photos of a vast majority of a state’s residents, most of whom have never been charged with a crime.