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The Guardian — Technology · September 29, 2026 · On the brief until October 13, 2026

Trial of live facial recognition in London stations leads to a false positive and no arrests

Criminal JusticePublic PolicyTechnology
THE AI ANGLE
Matching scanned transit passengers to police watchlists

A six-month trial of live facial recognition in London train stations cost £320,000, scanned over half a million faces, and yielded one false alert with zero arrests. Police extended the program to underground stations despite these results. This disconnect pushes policy and criminal justice practitioners to defend the cost, necessity, and legal oversight of mass surveillance.

Summary written by AI Business Lens with an AI model from the article at theguardian.com. It is not the article, and the publisher has not reviewed it. For publishers.

THE TEACHING ANGLE
The key debate is whether expanding biometric surveillance is legally proportionate when trials produce high costs and no direct arrests.

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