Half‑million London facial scans, zero arrests

A six‑month British Transport Police pilot scanned over 500,000 faces at London rail stations, cost more than £320,000, and produced one false positive alert with no arrests directly resulting; police have nevertheless extended and expanded the trial. The result is a clear empirical test of whether live facial recognition (LFR) on public transport yields actionable policing benefits versus surveillance harms. — If large LFR deployments routinely produce near‑zero enforcement outcomes, that undermines claims of proportionality and should recalibrate policy choices about funding, oversight, and lawful limits on public‑space biometric surveillance.