The Questionable Observer Detector

Also good for spotting time travelers.

Their Questionable Observer Detector (QuOD) can process any available video clips of groups of people present at the scene of event, spanning different times and locations to pick out any person who appears frequently in them. “The idea is that the person showing up unusually often as part of the crowd at these events may be someone that the police would want to talk to,” says Bowyer.
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