Legal analysis: due diligence refers to the determination of the risk of epidemic spread, and nucleic acid testing is needed to ensure that testing is necessary. In China, the key population "should do everything" and other population "are willing to do everything" for nucleic acid testing.

Legal basis: People's Republic of China (PRC) Law on the Prevention and Control of Infectious Diseases.

Article 42 In the event of an outbreak or epidemic of infectious diseases, the local people's governments at or above the county level shall immediately organize forces to carry out prevention and control in accordance with the prevention and control plan and cut off the transmission route of infectious diseases. When necessary, the following emergency measures can be taken and announced after being approved by the people's government at the next higher level: (1) restricting or stopping performances in markets, theaters or other places where people gather; (2) suspension of work, business or classes; (three) closed or sealed public drinking water sources, food and related items contaminated by infectious disease pathogens; (4) controlling or culling wild animals, domestic animals and poultry infected with the epidemic; (five) closed places that may cause the spread of infectious diseases.

Article 45 In the event of an outbreak or epidemic of infectious diseases, the State Council has the right to urgently mobilize personnel or reserve materials and temporarily requisition houses, vehicles and related facilities and equipment throughout the country or across provinces, autonomous regions and municipalities directly under the Central Government.