This works well. Basically every shop has a QR code on their door/counter and when we have outbreaks of COVID we are asked to register stores via an app as we g

This works well. Basically every shop has a QR code on their door/counter and when we have outbreaks of COVID we are asked to register stores via an app as we go in. Then if someone with a positive test is in the same store/time they can ask people to isolate and get tested. Downside is the big brother element and cops used it to catch someone which seems short sighted in keeping trust, so govt put new rules cops can't access easily.