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In reply to the discussion: Denmark's Burqa Ban Has Gone Into Effect [View all]jberryhill
(62,444 posts)China has a very sophisticated system for tracking the movement of people based on facial recognition.
I know a consultant who did work for the UK National Health Service to provide them with a system for automatically identifying patients who enter clinics, in order to detect fraud by persons who were not UK residents using the NHS.
The Chinese can automatically recognize and track everyone on any public street:

And the data can be sent to cops on the beat in real time:

Automated facial recognition and tracking is being deployed by many countries for just the purpose you mention - people who hide their faces are security risks. Hence, it must be made illegal to cover your face.
This is not at all about burqas. But cultural sentiments over clothing are being used to advance quite a different agenda entirely.