“Security. How should a bank handle customers wearing masks coming into a branch? It may be difficult to distinguish between a customer and a bank robber.”[1] - since when do bank robbers wear surgical masks??

Source: Matt Levine @ Bloomberg[2]

[1]https://www.fdic.gov/coronavirus/faq-fi.pdf
[2]https://www.bloomberg.com/opinion/articles/2020-03-20/senators-picked-a-good-time-to-sell-stocks