Her attorney, Lenard Leeds, said she had been unaware of the ruse before she uncovered the e-mail correspondence.

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Now, most lose money when a customer pays by credit card, says Lenard.

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"It's a rising price that leads to theft, " says Jeff Lenard, NACS spokesman.

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Lenard had earlier granted the 56-year-old leave to travel to Cuba to attend a memorial for his father, the second trip home he had been allowed to make since his release in 2011.

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But on Friday U.S. District Judge Joan Lenard ruled that Gonzalez, who had already been allowed to temporarily return to Cuba for his father's funeral, could stay there if he renounced his U.S. citizenship.

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"In a small store like a convenience store that is really putting a lot of signage all over the place, " says Jeff Lenard of the National Association of Convenience Stores, referring to the calorie labels.

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