Do you know how unreliably people recognize strangers? Many people are already wrongly convicted on such evidence. Even perfect automated facial recognition w

Do you know how unreliably people recognize strangers? Many people are already wrongly convicted on such evidence. Even perfect automated facial recognition won't convict people. It will merely point out people that should be looked at. If a jury looking at the image and the guy's face think the system is wrong, they can disregard it. As far as prevention goes, what we need are systems that can detect deception reliably, which will help if we ever decide to ask people meaningful questions. Not to convict, but to focus attention on a possible threat.