The camera is interesting, but i still think there would be problems in a crowd. (is it just me, or almost every time i look at a video some ad comes up... getting more picky choosing what videos i even watch now)
It would be a lot of trouble to do this for some illegal.
If they could get it to work, cameras all over the place... like they do in the uk.
But it would be easy to hide with a good mask anyway, seems it would be more to control the masses (one in many tools). A terrorist could get past this easy.
Maybe a camera on every corner, if you dont pay into obamacare they could find you real fast.