Former chief of Central Narcotics Bureau (CNB), Ng Boon Gay, 46, was found not guilty on Thursday afternoon of obtaining oral sex from Ms Cecilia Sue, in exchange for business favours.

In the closing submissions last month, Ng's lawyer, senior counsel Tan Chee Meng, had sought to show that prosecution had not proven its case beyond a reasonable doubt.

But lead prosecutor Tan Ken Hwee had argued that the onus was on Ng, to prove that he is not corrupt under the Prevention of Corruption Act, as Ng was a top civil servant with the power to influence decisions that could favour Ms Sue.

Ten witnesses, including Ms Sue, testified in the closely-watched sex-for-contracts trial after Ng was charged in June last year. Ng could have been jailed up to five years and fine of up to $100,000 for each of his four charges.