I'm also skeptical it would work decently without something else like your cell phone signal to reduce the number of possible faces. I think the real value of

I'm also skeptical it would work decently without something else like your cell phone signal to reduce the number of possible faces. I think the real value of this system is the intimidation factor. It really pushes the idea that the state can identify anyone anywhere is Moscow. It's useful to discourage both terrorism and political activism.