THREE men were each sentenced to 18 years' jail by the High Court yesterday, for possession of $1.5 million worth of heroin for trafficking. Leung Kam-tong, 32, Wong Siu-ling, 39, and Yuen Siu-ming, 40, had denied possessing more than 1.7 kilograms of No 4 heroin which were found at a flat in Temple Street where Leung and Wong lived. They were convicted by a jury. Passing sentence, Mr Justice Ryan said there was no evidence to show what role each played, but from the facts, he inferred they were preparing to operate a drug packaging and distribution centre from the flat. By their verdicts, the jury found the three were in joint possession of the drugs, the judge said. The guidelines said a term of more than 20 years was appropriate. Little could be said in mitigation for the three, but Mr Justice Ryan said he considered they had clear records, although Yuen admitted he was a trafficker. During the trial, Senior Crown Counsel Miss Dee Crebbin called evidence to show the heroin found by customs officers on October 22, 1991, belonged to the defendants. Yuen was seen leaving the premises and was linked to the drugs because his fingerprint was found on paper wrapped round the drugs.