During these COVID-19 times CDC-based precautions are being observed. 

All who come to the office must wear appropriate personal protective equipment such as an appropriate face mask covering both nose and mouth.  Masks must not be one-layer pleated style masks, bandanas, gaiters/neck fleece, knitted masks, bottom open masks, masks with a vent, nor material that allows light to penetrate the material (such as some synthetics).