Allegations of police concocting evidence have spiralled, the Provisional Legislative Council has been told. Security Bureau figures showed complaints about fabrication of evidence surged from 272 in 1995 to 327 last year. Principal Assistant Secretary for Security Philip Chan Kwan-yee admitted he could not rule out the occurrence of frame-up cases. 'Although we have preventive measures, that doesn't mean it won't happen,' he said. But he said accusations of frame-ups accounted for six to seven per cent of all complaints against police. 'This percentage is very small and not every complaint is substantiated,' he said. Assistant Commissioner of Police Michael Horner said some could be 'tactical' complaints. 'We have to recognise that criminals would do everything they can to prevent convictions,' he said. But independent Ma Fung-kwok argued that innocent people could easily be framed. 'A suspect could hardly get away if two or three officers collaborate to make up evidence,' he said. Deputy Secretary for Security Raymond Wong Hung-chiu said alleged fabricated evidence would be verified before being submitted to court. He added that such malpractice would not be tolerated. 'The force has no place for those officers who use illegal means to tackle crime,' he said.