> All of which is invalidated by people staking out a place and wearing a mask. Approximately 6 years ago, I saw a face detection demo, which detected the face

> All of which is invalidated by people staking out a place and wearing a mask. Approximately 6 years ago, I saw a face detection demo, which detected the face of a man behind a snow mask while running in the night with minimal lighting from a side-shot. I think seeing the eye and nose geometry was enough. The only time the system saw the face was from another camera in the same system head-on. I don't remember whether it was masked or not. If this is available for defense, it can be made available for civilian applications, too, but it won't be, because then you won't be able sold it to that price because of depreciation.