> At least 12 depositors Sixth Tone spoke with said their health code turned red when they scanned city-specific QR codes at railway stations, hotels, and other venues that required them.
> They said our health codes will turn green when we leave, and until then we need to stay at the police station.
Because they already have another system for social control: health code. From https://www.sixthtone.com/news/1010547/henan-bank-depositors...
> At least 12 depositors Sixth Tone spoke with said their health code turned red when they scanned city-specific QR codes at railway stations, hotels, and other venues that required them.
> They said our health codes will turn green when we leave, and until then we need to stay at the police station.