[upofadown]

We haven't really even come to terms with the false positive rate associated with just looking at people. When law enforcement wants to check ID all they have to do is say they thought you looked like someone. The high rate of false positives is a feature not a bug. You could set up an empty box with a lens drawn on it with a motion detector aimed to go off 4% of the time and the result would be almost as useful to law enforcement as a facial detection system that actual did something. The facial detection just increases the efficiency of the "papers please" checkpoint.