A police sergeant who helped a domestic helper extend her stay by submitting bogus employment documents was jailed for 2.5 years yesterday after being told he had 'fallen prey' to financial gain. Deputy Judge Stephen Geiser told Marco Lee Yau-tak, 40, in the District Court the woman had used him. 'It is extremely sad to see a man convicted of this and it goes without saying that you are of good character,' the judge said. 'The background report indicates you are a good family man.' Lee, who had a clean record throughout his 20 years' of police service, also gave the court a reference letter from the Commissioner of Police. Defence barrister Cheung Yiu-leung said Lee's crime was an act of stupidity rather than greed and pleaded with the judge not to send him to prison. 'He has been in custody for the past 16 days and has already experienced what it is like to lose his liberty,' Mr Cheung said. But Judge Geiser ruled a suspended sentence inappropriate because as a serving police officer he was expected to know better. Lee, a cook at the Fanling Police Tactical Unit base, told the Immigration Department Lulu Diwa, 39, from the Philippines, had worked for him as a domestic helper for three years. The woman, who finished working for a genuine employer in February 1994, had never worked for Lee but used him as a bogus employer to sign documents for her work visa between April 1994 and last year, in return for $1,500. Lee was found guilty on four charges of aiding and abetting, counselling or procuring the making of a false representation to an immigration officer.