THREE greedy vice officers abused their powers by turning a blind eye to brothels in return for cash backhanders, a court heard yesterday. Between June 1993 and September 1994, the Mongkok vice squad colleagues accepted cash in return for ensuring brothel bosses were not pestered by police, the District Court heard. So Man-on, 36, pleaded not guilty yesterday to four charges of conspiracy to accept advantages. The court heard he conspired to make money with former inspector Lai Kin-keung, who was sentenced to five years imprisonment in March last year for serious corruption offences. The two promised not to take action against a massage parlour, a gambling house and two brothels if the vice dens gave them money, it was alleged. They also said they would warn the establishments of any future police action. So was also charged jointly with Lee Tak-ming, 36, for another bribery offence, and was charged jointly with Tong Wing-keung, 30, on five counts of bribery. They deny all charges. The officers allegedly offered various vice establishments they would turn a blind eye in return for remuneration. So also pleaded not guilty to a charge of conspiracy to keep a vice establishment. Lee, in addition, pleaded not guilty to six charges of accepting an advantage. The court heard how he took backhanders of between $5,000 and $20,000 on six occasions from vice dens. The trial, before Judge Wilson, continues.