we're happy to testify how the algorithms work, how accurate they are, what mistakes have been made with facial recognition, and none of them made with clearview have come down to poor policing or investigative work, not checking or not having other people look at the results of the facial recognition — just basic stuff. have there been any mistakes from the police using clea rview? not that we know of. in many places in the us, the police often don't have to divulge whether they even used facial recognition. we have no idea how many people have been arrested because of this technology. a few cities have pushed back. in san francisco, the police�*s use of facial recognition technology is banned. matthew guariglia works for the electronic frontier foundation, which