London cops are using an unregulated, 98% inaccurate facial recognition tech

Without information on the total number of people scanned and cleared, it’s impossible to say anything meaningful about the accuracy of the system. Generating 104 alerts with 102 false positives is pretty terrible if the total number of scans is 300, but it’s pretty good if the total number of scans is something like 80,000 and the false negative rate is low.

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