If it seems to good to be true, it probably is. And ZShield face shields being marketed to the general public certainly fits that description, especially when it comes to their use by children.
from Science-Based Medicine https://sciencebasedmedicine.org/zshield-unproven-protection-from-sars-cov-2-infection-especially-for-kids/?utm_source=rss&utm_medium=rss&utm_campaign=zshield-unproven-protection-from-sars-cov-2-infection-especially-for-kids
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