It would be nice to have actual trials that show that masks are effective at reducing transmission (transmission, not stuff like reduced droplet emission etc).

It would be nice to have actual trials that show that masks are effective at reducing transmission (transmission, not stuff like reduced droplet emission etc). This BMJ blog post[1] argues (and I agree) that if we're able to make trials for drugs, why not for non-drug interventions? Note that it is not against such interventions, but suggests we do trials to better direct public policy. [1] https://blogs.bmj.com/bmj/2020/08/28/margaret-mccartney-we-need-better-evidence-on-non-drug-interventions-for-covid-19/#content https://blogs.bmj.com/bmj/2020/08/28/margaret-mccartney-we-n...