UK rail cops' £320K face-scanning spree nets zero matches

British Transport Police (BTP) spent more than £320,000 putting half a million commuters through live facial recognition cameras, only for the system to identify precisely nobody it was looking for. Figures obtained by civil liberties group Liberty through Freedom of Information requests, and reported by The Guardian, show BTP's six-month trial scanned more than 500,000 faces at London railway stations and generated just one alert. That turned out to be a false positive, meaning the technology produced no correct matches and no arrests directly resulting from an LFR alert. The exercise wasn't exactly light on resources either. According to the figures, deployments swallowed almost 100 hours of police officers' time and cost more than £320,000. Privacy campaigners at Big Brother Watch told The Register the results would be funny if the implications weren't more serious. …