If they use RFID chips, or devil a new tech that is the same in essence they could know everything about any environment your in. Since all products have an rfid bar code they could tell every product that is around you.where I'm sitting is a cottage cheese container. A book of rolling papers an empty popcorn bag a container full of clips, a sketch pad a box with a heat lamp aspirin an air, a small trash can with the lable still on it and a variety of other things with rfid codes.

With a chip implanted in me they could know everything around me, every product, every book I have. They could tell where it was all bought.