A consumer group is urging supermarkets to use programs that track customers' buying habits to alert people who have bought tainted food. Some retailers, such as Wegmans and Price Chopper, already are doing that. A Costco official said, "When an item goes through a recall, we can pull that item number and generate a telephone or address list very quickly. It allows us the ability to almost laser-point to an item and when it was purchased."

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