The defence counsel for former Central Narcotics Bureau chief Ng Boon Gay intends to impeach the prosecution's star witness, former IT sales manager Cecilia Sue, in the ongoing sex-for-contracts trial as she returned to the witness stand again on Monday.
Defence lawyer Tan Chee Meng continued to highlight inconsistencies in her statements to the Corrupt Practices Investigation Bureau a few months ago and her testimony in court.
They include whether former Central Narcotics Bureau head Ng Boon Gay had influence over the awarding of government contracts, and whether it was Ng or a CNB subordinate who had revealed the anti-drug agency's budget for an IT contract awarded in March last year.
Ms Sue claims she was forced by Ng into providing oral sex on four occasions last year out of fear.
Ng's defence lawyers, however, maintain that their client and Ms Sue, 36, were having an affair from 2009 until December 2011, when Ms Sue was called in for questioning by the CPIB.
It has also been Ng's defence that the extra marital relationship started two years before the first of the four alleged offences.
The prosecution's case, however, is based on anti-corruption laws that state that any civil servant who accepts gratification from anyone who has, or is seeking business dealings, with the Government is presumed to have done so corruptly.
This means that the onus is on Ng,46, to prove his innocence.
The prosecution and defence have agreed however that all procedures were adhered to in contracts awarded to the 36-year-old Ms Sue's employers by CNB at the time of the offences.
Still, the prosecution are emphasising that even if there was no actual interference in the contract approval processes, the fact that gratification - money, sex, or otherwise - was obtained is cause for great concern and can amount to criminal behaviour.
Ng faces a fine of up to $100,000 and/or a maximum jail sentence of five years for each charge.