A jailed Nigerian drug trafficker whose conviction for assaulting prison officers was overturned by the Court of Final Appeal in June is fighting to win his freedom, even as police investigate him for forging witness statements used in his appeal. Brian Hall, who was jailed for 18 years in 1998, argues that a separate Court of First Instance ruling in August that prison disciplinary proceedings breached the Bill of Rights means he should have been set free on October 29. Hall claims the judgment invalidated disciplinary penalties which extended the time he had to serve before being eligible for parole. In a message conveyed by one of his visitors in prison, Hall says he wants to file a writ of habeas corpus to secure his freedom but that he has been unable to do so because a judge has declared him a vexatious litigant - which restricts him from taking legal action. In the past he has complained to courts that he: Is a victim of religious persecution because he was not allowed to play reggae music (part of his Rastafarian religion); Has a right to be provided with newspapers even while being disciplined in solitary confinement; Has a right to possess his own hair trimmer at all times; and That prison authorities unlawfully refused him free spectacles. Hall used his successful appeal in June - based on witness statements from prison officers, which are now suspected of having been forged - as grounds to apply to have the restrictions on him taking further court action lifted. He lodged a claim saying prison officers had been careless in the execution of their duties by failing to disclose the existence of the witness statements. In arguments heard last month behind closed doors, the Department of Justice said Hall's claims should be suspended indefinitely in light of the forgery investigation. On Friday a judge suspended the case while police investigate the forgery allegations. Using a search warrant, police examined Hall's prison cell in July, and in October he was arrested on suspicion of forgery and perverting the course of justice. (He has yet to be charged in connection with this investigation). 'I consider it is just and convenient that Mr Hall's intended proceedings should be stayed pending the determination of the criminal proceedings,' Court of First Instance judge Mr Justice David Yam Yee-kwan said in his ruling. His judgment also made public the reasons why the prosecutor in the case did not warn the Court of Final Appeal the witness statements were suspected to have been forged. Yam said senior assistant director of public prosecutions Patrick Cheung Wai-sun filed an affidavit saying that at the time of Hall's appeal he did not consider there to have been enough evidence of forgery and 'the statements appeared to him on their face to be genuine'. Yam said Cheung had also indicated he had not challenged the statement because he did not want to alert Hall to the fact there was by then a police investigation. A spokesman for the Correctional Services Department said it would not comment on individual cases, but said the August judgment did not apply to Hall, and that in any case, the department had filed an appeal. Hall also complained police have harassed people visiting him in prison, including a domestic helper he called Babes who had since lost her job because of visits by police to her employer's flat. Meanwhile, he will stand trial tomorrow on unrelated charges of obstructing a public officer and common assault against prison officers. And next month a court will hear his appeal against previous convictions for assaulting prison officers.