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Face masks with plastic valves probably worthless.

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    Most valves allow unrestricted exhalation. That nullifies the purpose of the mask to impair the propagation of contaminants. That is no secret to the designers of those masks. Probably thousands of people have died because of those worthless masks.

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    Yes Chet you are right; the masks should stop all "virus" elements "floating" in the air from entering your lungs. ; indeed an in/out valve let the outside air in which should be filtered and is not.