I don't mean physiognomy, though such things periodically arise and are roundly and rightly ridiculed. I mean "Our computer says we have footage of you robbing

I don't mean physiognomy, though such things periodically arise and are roundly and rightly ridiculed. I mean "Our computer says we have footage of you robbing a supermarket" (higher error rates) Another way for issues to arise (your easily weaponised point, above) is if you need a separate system for recognising people from certain groups. If it's all the same system, it's harder to argue that you are acting in good faith when you only follow up on matches on marginalised groups.