Tracing is of no use without timely data; which comes, at least in theory, from testing. So even if tests are not just "available" but carried out, they are of little use unless the results arrive before carried become symptomatic. Once they are ill they will likely not be circulating and if they are hospitalized they will be tested on-site anyway.
And so suggesting that some testing sites offer 15 minute turnaround, when those sites are hospitals is another pointless distraction. If you're tested in hospital chances are you are there because you're sick and have had the virus for some time. Tracing at that point is too late and would involve too many people.
So are we there yet on testing? Absolutely not.
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