[Hyena]

A grocery store is different. It may process anywhere from 1 to 100 items per person, some of whose prices will depend on weight. Your local chains will probably always make you go through a pre-installed POS for payment and you will probably always appreciate that fact. The volume is high enough to benefit greatly from specialized tools.

Apple can do this because it sells low-volume, predictably-priced items out of its stores. Theft is probably deterred largely by the expense of the items they sell accessories for; far fewer of their customers will want or need to steal. This is the next step for Apple. The next step for your grocery is to identify items automatically, sort and package for carryout.