A judge has warned he is prepared to revoke the bail of alleged fraudster Aaron Nattrass to prevent further delays to the trial. In the District Court, Judge Duncan Kilgour said Nattrass might have to be remanded in custody for examination by Correctional Services Department doctors in order to speed up the case. The judge made his comments after he was told by prosecutor Peter Cahill that Nattrass' medical reports were not ready because he was due to be examined by a government doctor this Friday. The examination had been made one of his bail conditions. He had attended several appointments but a further test was required, the court heard. Judge Kilgour said he would monitor the situation carefully. Defence lawyer Andrew Raffell said Nattrass had been granted bail since March 1994 and had complied with all conditions. He argued the judge could not refuse to grant Nattrass bail unless the defendant caused a 'deliberate obstruction' to the case. Mr Raffell said the defence wanted to see the government doctor's reports before Nattrass testified in his application to stop the trial. The defence's application is based on the grounds that the withdrawal of former trial judge Brian Caird was unjust and unfair to the defendant. New Zealander Nattrass, 37, faces 13 fraud and deception charges. Judge Kilgour adjourned the case until Monday.