This week, Washington-based megastore Costco announced a new policy to help mitigate the spread of COVID-19. Starting Monday, in addition to employees, all shoppers must wear a mask that covers their mouth and nose at all times, with the exception of kids under the age of 2 or those who are unable to wear a face covering due to a medical condition. This policy applies to Costco locations across the country; there are 20 warehouses in the Puget Sound region.