This need for a principled approach was reinforced when a local police force in California contacted us and said they wanted to equip all their cars and body cameras with a capability to take a photo of someone pulled over, even routinely, to see if there was a match against a database of suspects for other crimes. We understood the logic but advised that facial-recognition technology remained too immature to deploy in this type of scenario. Use of this nature, at least in 2018, would result in too many false positives and flag people who had been wrongly identified, especially if they were
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