The wearing of surgical masks in some parts of Asia began when tens of millions died of an outbreak. I think it started in Japan -- but, I saw it first when visiting Kowloon, China a quarter century ago. It protects the wearer less than the average person walking down the street. In the U.S., people tend to go to work when they are sick, infecting other people. Some sort of macho, work ethic thing. May impress your boss -- but puts others at risk. When you are ill, you should avoid others. At least a mask protects others to some degree from airborne viruses when a sick person coughs or sneezes. This is particularly true in flu season. Casinos should respect this. How much it affects facial recognition, I don't know. Caucasians are lousy at identifying Asians anyhow.
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