On November 20, 2020 the US Food and Drug Administration (FDA) published a webpage to explain how Emergency Use Authorization (EUA) , a regulatory mechanism to them during public health emergencies.
Under an EUA, FDA may allow the use of unapproved medical products, or unapproved uses of approved medical products in an emergency to diagnose, treat, or prevent serious or life-threatening diseases or conditions when certain statutory criteria have been met, including that there are no adequate, approved, and available alternatives.
They reiterated the FDA is “globally respected” as a regulator and are trusted by the public, insinuating their authorisation means a “rigorous” evaluation has been made.