Costco knows you’re using your friend’s membership card. To save you the embarrassment of telling you off when you’re in the checkout line, now Costco will try to catch membership moochers before they even get in the door.The retailer is implementing stricter policies and cracking down on non-members using other people’s cards by requiring shoppers to scan their membership cards to enter stores.“Over the coming months, membership scanning devices will be used at the entrance door of your local warehouse,” Costco said in a statement online. “Once deployed, prior to entering, all members must scan their physical or digital membership card by placing the barcode or QR Code against the scanner.”For members with cards that don’t have a photo, Costco says to come prepared with a valid photo ID but encourages shoppers to visit the membership counter and have their photo taken.Costco’s new rule also requires guests to be accompanied …