The Louisville, Ky.-based chain is reeling after a Chinese supplier was accused of selling expired beef and chicken to it, McDonald's and possibly other restaurant chains. Just 18 months earlier, KFC's sales plunged in China after a supplier violated rules on drug use in chickens.

Global fast food chains are rushing to expand in China, but even experienced operators face costly pitfalls in a fast-changing food supply industry plagued by repeated safety scandals.

Breakneck growth has strained the ability of companies to monitor thousands of farmers and meat processors, many of them small and remote, with incentives to cut corners, according to people who follow the industry. They say regulation and government enforcement are lagging.

"We are going to see more issues like this," said Ben Cavender of the China Market Research Group.

"On the supplier side, people are not well-trained, or there is not good oversight," he said. "On the restaurant side, they have people checking the products, but they probably don't have enough people who are spending enough time at the supplier sites."

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