The court heard Leung Shing-yan's revolver, missing since he was killed in 2001, was rusty when found at the Tsim Sha Tsui shoot-out, causing distortion to grooves on bullets fired from it. A friend of Tsui Po-ko, who was killed in the shoot-out, gave evidence on Tsui's character and financial situation. THE TESTIMONY Ballistics expert Jeffery Lloyd Chow, 48, said tests were 'inconclusive' on whether the revolver was linked to the killing of Leung in March 2001 and the bank robbery in Tsuen Wan in December that year. 'The grooves displayed by the bullets fired from the rusty retrieved gun were different to the ones found on the bullets discovered in the 2001 incidents,' he said. 'A rusty barrel may create additional pattern on the grooves.' Godfrey Lee Kai-fai, a specialist in gunshot residue, said the residue found on Tsui's left hand could not be used to support the allegation that he had shot with his left hand. 'Gunshot residue can be found on a person's hand when he fires with the hand, the hand is within a short distance from the gun, or it has contacted something contaminated by gunshot residue,' he said. 'It is only a possibility that he did open fire with his left hand.' Li Ngai, 35, a former policeman and friend of Tsui since 1999, said Tsui had won HK$210,000 from betting on a soccer match in 2004. 'He took out HK$75,000 cash from his rucksack... We bet on a match in which China played Japan. At last, Japan won the game and he won HK$210,000.' But Mr Li said constable Tsui only gambled in the same way that many people invested on stocks. 'He only put bets on two soccer matches as far as I know. They were all very wise decisions. If you ask anyone here, they will also put bets on these two matches.' MONDAY The inquest will hear evidence from Tsui's colleagues and supervisors on his performance at work and personality.