A DRUG trafficker who said he paid a police constable $200,000 to 'fix' his trial had two other officers on his payroll, the High Court was told yesterday. Chu Kam-to, 44, asked to see two sergeants when he was first arrested for possessing heroin with intent to traffic in March 1992, the court heard. Robert Forrest, defending Constable Hau Wing-sum, 26, suggested Chu hoped the sergeants would be able to help him. 'You might have requested to see them because they were two police officers who were on your payroll, and you thought they could help you get out of the difficult situation you were in,' Mr Forrest said. However, Chu denied that he even knew the sergeants, who were identified in court as So Koh and Cheung Ko. Mr Forrest suggested that Chu was trying to protect them. The witness replied: 'That is not true.' Hau has pleaded not guilty to stealing heroin from the property office at Sheung Shui police station. He also denies receiving a $200,000 bribe, and other weekly payments from Chu in return for tipping him off about police raids. The heroin was to have been an exhibit in the trial of Chu and his wife, Wong Yuk-lan, 36. But they were both freed and a permanent stay of proceedings ordered in their trial when it was discovered that the drugs were missing. The court heard that Chu later struck a deal with the Legal Department in which he was given immunity from prosecution in relation to the drug allegations. In return he would give evidence against Hau. The court was told that the police returned to Chu $160,000 - the proceeds of drug trafficking. But he denied that this was part of the deal. Chu said he was given the money back within three months of his trial being halted. But all the cash had gone in fees to a lawyer who acted for him at the time. He said he first met Hau in 1991. The officer asked for $50,000 in return for tipping him off about police raids in the Shamshuipo area, he told the jury. Chu said he later paid Hau $5,000 a week to ensure he was not arrested. The officer had promised to send him a pager message - the number 88 - to warn him if a raid was about to take place. But their plans had gone wrong when a different team of officers raided Chu's flat before Hau had a chance to warn him. The police seized 91 grams of heroin. The witness said he spoke to Hau after being released on bail. The officer had demanded $1 million in return for sabotaging the trial of Chu and his wife, the court heard. But Chu said he could only afford $500,000. The officer had asked Chu to give him the list of exhibits in the case. This was done on the stairway of a branch of the Hongkong Bank when Hau was in uniform, the court was told. They later met in a mahjong room, where Hau showed Chu the drugs and then flushed them down the toilet, the court heard. Chu said he gave Hau an initial payment of $200,000. Chu said he confessed to the police when arrested in relation to the theft of the drugs from the police station. He agreed to lure Hau for a meeting at a hotel, after which the officer was arrested. The witness has pleaded guilty to offering an advantage to a public servant. He will be sentenced at the end of Hau's trial. He is currently serving a 14-month jail term for bribing another officer. Chu said Hau had played a part in framing him for that offence and had also arranged for his wife to be threatened. The trial before Deputy Judge Burrell continues.