It’s PCR and you can get it down to a few hours turn around time in a lab, even in the US. China does batch testing with retests for accuracy. The main difficu

It’s PCR and you can get it down to a few hours turn around time in a lab, even in the US. China does batch testing with retests for accuracy. The main difficulty is getting everyone to give a sample but with China’s level of social cohesion and control that is a solved problem.