Masks with valves defeat the purpose of wearing a mask to slow the spread of the coronavirus. The valves allow exhaled air which may contain the virus from an asymptomatic or pre-symptomatic person into the air, thus defeating the purpose of wearing a mask. Anytime I see a person with a valved mask, I consider them as if they are not wearing a mask at all. I'm surprised to see valved masks being worn by TV commentators and newscasters. I guess they are not aware that their mask does nothing to slow the spread.
The CDC and our experts should be warning people to not wear valved masks and the reason why these type of masks are useless during a pandemic. I have yet to see any warnings to this effect anywhere.
Here is an article explaining why valved masks are not for the purpose of slowing the spread of the virus........
Masks with Valves - Article - Community Care Physicians P.C.