Analysis of information sources in references of the Wikipedia article "Gutter oil" in English language version.
The industrial chain of gutter oil has multiple links, so convicting people in the different links is difficult. Merely modifying the raw gutter oil is illicit. However, deep-processing gutter oil may not constitute an offence because it can be used to produce rubber, soap and bio-fuel. The sale of gutter oil as cooking oil may constitute a crime, but this link is underground. Therefore, in China, there are many rumours about gutter oil processing, but cases are infrequently prosecuted.
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: CS1 maint: numeric names: authors list (link)The industrial chain of gutter oil has multiple links, so convicting people in the different links is difficult. Merely modifying the raw gutter oil is illicit. However, deep-processing gutter oil may not constitute an offence because it can be used to produce rubber, soap and bio-fuel. The sale of gutter oil as cooking oil may constitute a crime, but this link is underground. Therefore, in China, there are many rumours about gutter oil processing, but cases are infrequently prosecuted.