Can you point me to a non mechanistic non associative study that demonstrates that face masks work to prevent community transmission of SARS-2?
EDIR: I can’t reply to the child comment about condoms (does HN have a nesting limit?) but suffice to say we only have 1 RCT on SARS-2 so playing the significance game is silly. You can’t point to a single RCT showing an effect because it doesn’t exist. That’s the problem. We’re mandating an intervention that is unproven to work and rests on theoretical assumptions that are now known to be false.
You can go look at non-SARS-2 RCTs if you want but those also look abysmal. For example go read Macintyre’s cluster-randomized controlled trial of cloth masks in healthcare workers. It’s not encouraging.