“Masks prevent an infected person from spreading covid.”
Well, they prevent someone SNEEZING from putting mucous on you. To that extent they work. So does standing 3-4 feet away.
Now....where are the studies showing they prevent asymptomatic people from spreading squat? Or the studies showing asymptomatic people spread it to any significant degree at all?
Except, just who is stupid enough to sneeze with a mask on?