E/CN.4/2002/76 page 7 (h) Provisions should give all detained persons the ability to challenge the lawfulness of the detention - e.g., through habeas corpus or amparo. Such procedures should function expeditiously; (i) Countries should take effective measures to prevent prisoner-on-prisoner violence by investigating reports of such violence, prosecuting and punishing those responsible, and offering protective custody to vulnerable individuals, without marginalizing them from the prison population more than necessitated by the needs of protection and without rendering them at further risk of ill-treatment. Training programmes should be considered to sensitize prison officials as to the importance of taking effective steps to prevent and remedy prisoner-on-prisoner abuse and to provide them with the means to do so. In accordance with the Body of Principles for the Protection of All Persons under Any Form of Detention or Imprisonment, 1 prisoners should be segregated along the lines of gender, age and seriousness of the crime, as well as first-time/repeat offenders and pre-trial/convicted detainees; (j) When a detainee or relative or lawyer lodges a torture complaint, an inquiry should always take place and, unless the allegation is manifestly ill-founded, public officials involved should be suspended from their duties pending the outcome of the investigation and any subsequent legal or disciplinary proceedings. Where allegations of torture or other forms of ill-treatment are raised by a defendant during trial, the burden of proof should shift to the prosecution to prove beyond reasonable doubt that the confession was not obtained by unlawful means, including torture and similar ill-treatment. Serious consideration should also be given to the creation of witness protection programmes for witnesses to incidents of torture and similar ill-treatment which ought to extend fully to cover persons with a previous criminal record. In cases where current inmates are at risk, they ought to be transferred to another detention facility where special measures for their security should be taken. A complaint that is determined to be well founded should result in compensation to the victim or relatives. In all cases of death occurring in custody or shortly after release, an inquiry should be held by judicial or other impartial authorities. A person in respect of whom there is credible evidence of responsibility for torture or severe maltreatment should be tried and, if found guilty, punished. Legal provisions granting exemptions from criminal responsibility for torturers, such as amnesties, indemnity laws etc., should be abrogated. If torture has occurred in an official place of detention, the official in charge of that place should be disciplined or punished. Military tribunals should not be used to try persons accused of torture. Independent national authorities, such as a national commission or ombudsman with investigatory and/or prosecutorial powers, should be established to receive and to investigate complaints. Complaints about torture should be dealt with immediately and should be investigated by an independent authority with no relation to that which is investigating or prosecuting the case against the alleged victim. Furthermore, the forensic medical services should be under judicial or other independent authority, not under the same governmental authority as the police and the penitentiary system. Public forensic medical services should not have a monopoly of expert forensic evidence for judicial purposes. In that context, countries should be guided by the Principles on the Effective Investigation and Documentation of Torture and other Cruel, Inhuman or Degrading Treatment or Punishment as a useful tool in the effort to combat torture;2