http://www.renewamerica.com/columns/fischer/200806

A review of the scientific literature on COVID-19 reveals that, simply put, “masks and respirators do not work. There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviews of RCT studies, which all show that masks and respirators do not work to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles.”