You're FOS, as usual.Zero difference in cases between states mandating masks and those that don’t.
April15 2021
States that required people to mask up last year had lower rates of COVID-19 than those with no mask requirements, a new study finds.
Researchers examined data from all 50 states and Washington, D.C., to assess mask policies, people's self-reported use of masks in public, and COVID rates from May through October 2020.
They factored in a one-month delay between mask wearing and its subsequent potential effect on COVID infection rates.
"States with the lowest levels of mask adherence were most likely to have high COVID-19 rates in the subsequent month, independent of mask policy or demographic factors," the Boston University team recently wrote on the preprint server medRxiv, before their findings had been peer-reviewed.