An ICAC surveillance operation aimed at keeping their internal dirt under wraps was mounted in the guise of an investigation into the suspected malingering of an officer, the court was told yesterday. Defence counsel for Susana Chan, a senior investigator charged with fraud for allegedly cheating the anti-graft body out of 402 days of sick leave, argued surveillance records indicated the ICAC was more concerned about whether she was leaking their secrets to outsiders than her physical fitness. The year-long surveillance began in late 2002 after Chan, 43, lodged an internal complaint against her chief investigator, Eric Yang Yan-tak. She claimed Yang had unlawfully suppressed evidence in court and was responsible for an officer's imprisonment for perjury. Cheng Huan SC, for the accused, asked principal investigator Danny Wong Siu-cheung why the surveillance operation had been broadened in December 2002 to cover the relationship between Chan and John Roseburgh, who then headed the internal investigation of Yang. The witness replied that had been the instruction of his senior after their surveillance revealed the pair had been meeting. Mr Cheng applied to the court on Thursday for a permanent stay of proceedings, arguing the charge was the ICAC's revenge on his client for complaining about Yang. 'Was the ICAC worried about possible leaks of information between the two of them?' prosecutor David Fitzpatrick asked in cross-examination. The witness agreed. An internal ICAC report submitted to court listed the times and venues of the pair's 'clandestine' meetings between December 2002 and January 2003, including Mr Roseburgh's suspected visit to Chan's home during office lunch hours. It concluded Mr Roseburgh should not be confronted as he would 'inevitably be made aware of the covert monitoring of Chan's activities'. It also recommended no further action against him as he would retire in about a year. Another report accused Mr Roseburg of not revealing his 'intimate relationship' with the defendant. The defence argued that most parts of the surveillance videotapes played in court yesterday were focused on the people whom she was socialising with. 'We have nothing here except this one woman against the might of the ICAC,' Mr Cheng said. The defence counsel also criticised the commission for seeking to influence the decision of the independent Medical Assessment Board by presenting board members with a report accusing Chan of malingering before they met her to assess her fitness to work. The report gave a list of her activities during the surveillance period, including long hours of walking and driving, visits to the New Year fair at Victoria Park and a karaoke. It said the defendant had lied about her physical condition and should be able to resume her duties.