New PCI DSS compliance stats for the U.S. released by Visa on Monday (May 26) showed—for the first time—a drop in the compliance rate for Level 1 retailers, albeit a tiny one, from 96 percent to 95 percent. But it's significant in that Level 1—the largest chains in the Visa empire—has always shown a steady increase and, at worst, a plateau. This means that four chains that had been compliant are no longer. There are several explanations
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