I’m not aware of any RCT that could control for the variables to measure transmission. That would be very hard. But two RCT studies have been done to measure in

I’m not aware of any RCT that could control for the variables to measure transmission. That would be very hard. But two RCT studies have been done to measure infection on the individual wearing it and they show cloth and surgical masks as not significant. Of course there’s a lot of nuance to the results but it’s obvious the signal isn’t there unlike say the vaccine during its RCT.