Costco is now requiring that EVERYONE entering their warehouse store to wear a mask.
The old rules specified that anyone with a medical reason for not wearing a mask was exempt. Now, if you can’t wear a mask for medical reasons, you’re not admitted to the retailer at all. Same goes for people who work for Costco.
Another major retailer is clamping down too. When the pandemic began, Walmart limited the number of shoppers in stores to 20% capacity at the same time. Those rules eventually went by the wayside. Walmart is bringing that rule back.