What about wristband tracking using satellite like onstar? Everyone would get one and data would be fed into a main computer ie cloud. Those positive would be identified and anyone around them100 meters would be notified that they are in the vicinity of a positive. Oh yeah, I think S Korea is doing some of this already. And yesterday they had in a country of 52 million people, 11 new cases and only 1 new death.
It is probably a pipe dream in Western countries.
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