No Checkout Needed: Amazon Opens Cashier-Less Grocery Store
(CBS 2 Chicago)

Families can shop together with just one phone scanning everyone in. Anything they grab and leave the store with will be added to the tab of the person who signed them in. But shoppers shouldn`t help out a stranger reaching for the top shelf: Amazon warns that grabbing an item for someone else means you´ll be charged for it if they walk out with it.