Eight criminals headed by Cai Shaosheng were convicted of smuggling of ordinary cargos after open trial of the diesel oil smuggling case in the Shantou Intermediate People's court. Seven of them were sentenced one to five years imprisonment and they were fined from 10, 000 to 200,000 yuan respectively; the other one was exempt from criminal punishment. This case is the largest oil products smuggling case that happens in China's exclusive economic zone since the founding of P.R. China in 1949.

On march 26, 2004, the Shantou Customs caught a Bolivian oil tanker Miri, which was transfusing oil to China's Yuelufeng 28338 fishing boat in China's exclusive economic zone. A total of 29 sail men and 4,371.1 tons of diesel oil with worth of 44.395 mln yuan were captured.

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The exclusive economic zone is an area beyond and adjacent to the territorial sea of a coastal country. According to the U.N. Convention on the Law of the Sea, the coastal country has exclusive jurisdiction in its exclusive economic zone, including jurisdiction on laws and regulations about customs, finance, hygiene and immigration. China joined in the Convention in 1996 and declared China possessed exclusive economic zone. In 1998 China promulgated the Law of Exclusive Economic Zone and Continental Shelf, which stipulates China has jurisdiction on acts that infringe China's interests in the exclusive economic zone.