Tong, the 78kg category winner in Beijing, has been banned for two years and stripped of her 2009 world title.
But her coach Wu Weifeng believes China's food safety problems were responsible for the positive test.
"She trained in Europe and was sick of the food so we gave her a lot of pork chops when she came home," said Wu.
Clenbuterol is used to prevent animals like pigs getting fat, but has been used illegally by athletes to build up muscle....
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