US citizens are not that far off from them...
You could sell a lot of people on 500MP cameras to detect people in stadiums "for terrorism", and in fact I'd be surprised if we don't already do something similar
After all, we already saw private citizens scanning faces at events: https://www.rollingstone.com/culture/culture-lists/future-en...
And we've actually tried to make prepaid phones require ID (which is the spirit of the biometrics)... no suprise, with the terrorism excuse: https://www.cbsnews.com/news/lawmakers-require-id-to-buy-pre...
And does it even matter if there are uncounted companies and agencies having deployed their own CCTV-networks? Traffic counting, toll-roads, security, public transportation, inner city-surveillance, advertisement displays, and sharing that information combined with the SSID/MAC-address/IMEI of your phone via WIFI/GSM/UMTS/LTE/Bluetooth and sharing that information with who knows who for whatever reason and goal?
Watch out for the blimps!
Now playing: [1] https://www.youtube.com/watch?v=2kE8565_xrc (Tiga & Zyntherius Sunglasses At Night, 3m42s)
China has combined this with (a) 500MP camera which can clearly identify anyone in a stadium full of people and (b) forcing all citizens to present biometric information when signing up for a phone plan.