“The evidence just is and was not there to support mask use for asymptomatic people to stop viral spread during a pandemic. While the evidence may seem conflicted, the evidence (including the peer-reviewed evidence) actually does not support its use and leans heavily toward masks having no significant impact in stopping spread of the Covid virus.”
Paul E. Alexander. Masking: A Careful Review of the Evidence. American Institute for Economic Research. 11 February 2021. https://www.aier.org/article/masking-a-careful-review-of-the-evidence/.