Academic Huang Siming, who claimed the US Government implanted a device in his teeth to control his mind, was cleared yesterday of threatening to kill a university president. Magistrate David Thomas said the content of a letter written by Huang to Professor Woo Chia-wei did not constitute a threat. He ruled the former assistant professor at the Hong Kong University of Science and Technology had no case to answer. But Huang still faces a count of criminally intimidating the Dean of the university's Business and Management School, Professor Chan Yuk-shee. Professor Woo received a letter in English typed by Huang in July last year, Kwun Tong Court heard. It opened by arguing that Huang deserved a promotion for his achievements in scientific computing. But then it read: 'I think I can kill some of you and will not be guilty of the killing.' Huang admitted writing the letter but denied intending to kill the president. Quoting part of the letter, he said: 'I decided not to do so since I am a civilised man.' Yesterday, Huang accused the police of taking advantage of his ignorance about his legal rights. The academic said the police had persuaded him not to find a lawyer in the first two interviews. He was also not aware he had been arrested when police took his first two caution statements. But two officers, in the stand, rejected Huang's allegations. Huang testifies today over the alleged intimidation of Professor Chan. Huang filed a US$100 million (HK$773 million) writ in January against the US Government and the university. He claimed the US Government secretly implanted a device in his teeth to control his mind and the university was monitoring him. The writ against the university was later dismissed.