This isn't the right question. Cars help the police to move much more quickly than they could on foot, for example, and properly used can be part of a system th

This isn't the right question. Cars help the police to move much more quickly than they could on foot, for example, and properly used can be part of a system that values justice and human rights. A better question might be: "given how accurate this facial recognition system is, what if anything in addition to a match should be required for an officer to detain someone matched by it?". I don't have an answer for this one. This tech is new, and complex, and hard. We'll likely abuse it before we figure out how to properly balance human rights and protecting the public.