Media in China recently reported that fuel tankers are being used to transport cooking oil. The report has ignited public outrage over food safety, which has long been an issues as suppliers cut corners to save costs.

A scandal over cooking-oil contamination in China that came to light earlier in July highlights the long-standing struggle to improve food safety measures.

The scandal, first revealed by state-backed media The Beijing News on July 2, involves two Chinese companies that reportedly used fuel trucks to transport edible oil without any cleaning process between loads.

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In 2005 and 2015, Chinese media uncovered similar practices of improperly transporting food oil.

Another food safety problem known to authorities is the use of “gutter oil,” which is cooking oil recycled from drains and grease traps, and cheaply sold off to restaurants.