Grocery retailer Costco is testing out a new system for customers entering the store that would prevent nonmembers from shopping inside.

The move by the warehouse shopping center was first discovered in the state of Washington, where people spotted a sign informing shoppers they would be asked to scan their membership card before they could enter the store. The move is likely an attempt to cut down on nonmembers bypassing membership requirements to shop at the store because the retailer has also utilized self-checkout registers.