A prison officer was yesterday sentenced to six years' imprisonment for smuggling heroin and cocaine into jail in return for HK$50,000. The defendant, Yau Chun-hung, 34, was an assistant officer in the Correctional Services Department. He had earlier been found guilty of one count of conspiracy to traffic in dangerous drugs. In sentencing him, District Court Deputy Judge Sham Siu-man said the defendant had destroyed the good work of the department combating drug abuse in prisons. The judge reprimanded Yau for abusing his position and the trust the government and the general public had placed in him by committing a very serious crime. The court heard that in March last year, two prisoners at the Lai Chi Kok Reception Centre learned that Yau was prepared to bring drugs into the prison for a reward. Yau and the two prisoners came to an agreement that the officer would bring 28 grams of heroin into the prison in return for HK$50,000, to be paid in two instalments. The girlfriend of one of the prisoners gave Yau HK$20,000 and a cigarette box containing 28 grams of heroin and 7 grams of cocaine. The drugs were later passed to the two prisoners, who resold part of the consignment to other inmates, the court heard. Yau later asked the inmates to pay him the remaining HK$30,000 they owed him. The case came to light as a result of surprise urine tests on prisoners in April last year. Prison officers found traces of dangerous drugs in the urine of 14 prisoners, the court heard. Yau was arrested on August 30 last year after an ICAC probe.