Every smartphone has GPS now, we could trace the entire path of everyone throughout the day if we want, and make it mandatory to keep location tracking enabled
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You could do it with little privacy invasion. No problem. Phones can offline log all their close contacts and compare them every hour with a list of published known infected phone IDs. Only if you were in contact you would connect with the health department.
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Sadly you need to store the entire trace of each individual over more than the last two weeks in a central data base to make it work, because you will find out about infections only after the fact.
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