Is this not standard everywhere self checkouts are used? All of the ones I've ever seen used scales and enforced the weight matching the scanned item. Of course

Is this not standard everywhere self checkouts are used? All of the ones I've ever seen used scales and enforced the weight matching the scanned item. Of course, there are still possible cheats: not putting the item in the bagging area, for example, or telling the kiosk you are buying carrots and then weighing something more expensive.