From the body of the study:
Posted on: June 26, 2020 at 08:10:08 CT
ummmm MU
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"Since mask wearing by infected individuals can reduce transmission risk, and because of the high proportion of asymptomatic infected individuals and transmissions, there appears to be a strong case for the effectiveness of widespread use of face masks in reducing the spread of COVID-19. However, there is no direct evidence thus far on the magnitude of such effects, especially at a population level."
"Positions on widespread facial mask use have differed worldwide but are changing over time. In the US, public health authorities did not recommend widespread facial mask use in public at the start of the pandemic."
This in a study that ends with saying masks "might" help.
This is your "definitive proof" ??
Edited by ummmm at 08:13:14 on 06/26/20