HOW SO?? German Covid cases feared to reach 100,000 daily. Germany has been in strict lockdown since December, with world class test and trace and masks mandated everywhere. God it’s almost like societal interventions don’t stop the virus 
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...The zeal with which it is currently being pursued is yet another example of the frenzy for untested innovations bred by hysteria and based largely on intuition instead of evidence.https://inference-review.com/article/on-the-futility-of-contact-tracing …
indeed, there‘s no way for it to work even theoretically, given delays involved in obtaining test results and the fact that only about 20-25% of infections are even detected in DE. empirically it also has no observable effect.