The nationwide crackdown reveals that the processing of “gutter oil” has formed an industrial chain.

此次全国范围内的围剿暴露出地沟油的加工已形成了一条产业链。

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Using gutter oil, breeding ratios are off the charts!

使用地沟油的增殖比例远远超出了标准！

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Other critics claim that confiscating gutter oil is a violation of personal freedom.

其它批评人士声称没收地沟油侵犯了个人自由。

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Previous cases also involved the use of gutter oil as cooking oil or in food production.

BBC: China arrests hundreds over fake or tainted meat

Last year there were reports that some suppliers to pharmaceutical firms used so-called gutter oil - reprocessed kitchen waste dredged from restaurant drains - to make antibiotics.

BBC: China arrests hundreds over fake or tainted meat

The government is nervous of the public's deep mistrust of its ability to supervise the food market (even officials admit that detecting gutter oil can be tricky).

ECONOMIST: Food safety in China