>> No, the main problem is that details aren't passed on. How do you know which
>> door to knock on?
>>
You visit anyone who has tested positive and demand their contacts, with the threat of criminal action if necessary, and so on with those contacts. Some countries combine that with allowing agencies full access to electronic records of credit card, mobile phone, bank account, etc usage.
I'm not saying people welcome such measures, just that we are in a crisis with deaths and economic costs similar to wartime when the population have accepted far worse as necessary evils.
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