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Courtesy of my friend Lori, — UPC symbols are being replaced by RFID tracking chips in some items, which will help stores track individual products as they are carried around in the store. Which means that when you decide you don’t want that [item x] and take it out of your cart and set on any old shelf in the store, they’ll be able to find it and put it back where it goes. It’s possible that the technology could be used to track other things, like what you carry into the store with you if the tracker is still on it, but those issues are far in the future.