A MAINLANDER working as a cook in Bolivia was yesterday convicted of trafficking in more than three kilograms of cocaine and sentenced to 20 years' jail. Passing sentence, Mr Justice Wong described Hu Tian-yue, 34, as an international drug trafficker and said his crime was despicable. Hu, who is originally from Shanghai but claimed he had to flee China after the 1989 massacre, had denied the charge. During the High Court trial, prosecutor Graeme Hagon said that police on surveillance duty on February 20 saw Hu leaving the International Hotel in Tsim Sha Tsui. They followed him to Tseung Kwan O, where he alighted from his cab. Police lost sight of him, but when he re-appeared he was seen carrying a bag. He was stopped by police on his way back to Tsim Sha Tsui and the drugs were found inside the bag. His claim that he had no knowledge of the drugs found was rejected by the jury. In mitigation, Simon Westbrook, said Hu was only a courier.