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The Boston-based consumer products company is one of the first to start trials of the controversial radio frequency identification (RFID) tags in its Mach 3 razor blade packets. U.K. supermarket chain Tesco has been testing the tagged products in a store in Cambridge, England. But privacy groups started protesting outside the Tesco store when it emerged that the supermarket was automatically taking photographs of shoppers when they picked the blades off the shelf and when they left the shop with any tagged product.