Under normal circumstances, the police station will not contact individuals, because nucleic acid testing and health code are assigned to the corresponding communities for community workers to check.

Health code is a personal two-dimensional code based on actual real data, which is declared by citizens or people who return to work after self-declaration. After background review, the QR code is generated as a electronic certificate where individuals enter and exit locally, which realizes one-time declaration and is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.