They weren't sued because there was carcinogens in the chicken, but they were sued because of California's Proposition 65, which stated that if there's anything dangerous in the products then the companies had to give a clear warning.
快餐店被告并不是因为在鸡肉中有致癌物质， 而是因为加利福尼亚州65号提案， 提案要求如果产品中有任何有害成分 公司应该给出明确的警告