Would you agree to stand in a police line-up if you never committed a crime? Probably not. But if you have a drivers’ license, you might be in a perpetual, digital line-up. 18 states allow the FBI to scan your license photo, and many states allow local law enforcement to do the same. One in two American adults — that’s about 125 million people —  are in the FBI’s facial recognition database, and most, if not all, searches are conducted without a warrant.