The only problem with masks, and it really isn’t specifically a mask issue, is that the wearer needs to have an incredibly clear understanding of safe technique.
How to safely remove a contaminated mask and contaminated clothing are as important as wearing everything in the first place. You have to be scrupulous in following safety recommendations in this regard.
If you don’t know what you are doing when you remove your gear, you can easily contaminate yourself and others.
I watch lots of House and Grays Anatomy, I think I got it covered. /s
A mask is only part of the picture.