A/HRC/46/26/Add.1 prevention, investigation and prosecution of any abusive practice that may negatively impact the conditions of detention and treatment of inmates; (e) Determine prison capacity not only on the basis of available beds, but primarily on the basis of available space per inmate, in line with the international minimum specifications of 3.4 m2 per inmate in shared accommodation and 5.4 m 2 per inmate in single cells; (f) Allocate adequate resources to better staff prisons with qualified medical personnel, improve the infrastructure for forensic medical examinations, in line with the Istanbul Protocol, and ensure the full independence of all forensic medical staff by placing them under the authority of the Ministry of Health and Social Development; (g) Institute routine medical examinations for newly arriving inmates and regular medical check-ups for all inmates; (h) Adapt the medical report forms that are currently used so that they meet the recommendations made in the Istanbul Protocol; (i) Adopt and implement special health programmes to address the challenges of chronic or contagious diseases, including HIV/AIDS, and of drug addiction, including through the introduction of effective drug-replacement therapies; (j) In cases of death in custody, apply the standards established in the Istanbul Protocol and the Minnesota Protocol on the Investigation of Potentially Unlawful Death, and ensure the independence of the investigation and the protection of witnesses; (k) Take steps with a view to instituting a truly accessible, independent and confidential complaints procedure by introducing a system of boxes for depositing complaints in detention centres and police stations, ensuring that the boxes are accessible to all inmates without supervision and can be opened only by staff of independent oversight mechanisms external to the place of detention; (l) Ensure that solitary confinement can be imposed only as a measure of last resort, in line with the Nelson Mandela Rules, particularly rules 43–45, and that it is subject to transparent procedures and safeguards against arbitrariness. 98. Regarding prompt, thorough and impartial investigations, the Special Rapporteur recommends that the executive and judicial authorities: (a) Create a unified registration system for acts of institutional violence and victims of torture and ill-treatment, and ensure that allegations of torture and illtreatment trigger a prompt, thorough and independent investigation to bring those responsible to justice and provide redress to the victims and their families; (b) Ensure that all investigations of torture and other forms of institutional violence are conducted by investigators who are fully independent from the authority or entity under investigation; (c) Ensure that accessible, fully independent, proactive, expedient and effective complaints, oversight and investigative mechanisms are in place for the prevention, investigation and prosecution of corruption in all relevant branches and services of government and the judiciary; (d) Implement systematic training programmes on the Istanbul Protocol for all lawyers, prosecutors and judges who may be involved in relevant judicial cases, so as to strengthen their understanding of the potential and limitations of medical examinations in the identification and documentation of signs of torture and other forms of ill-treatment; (e) Allocate the required resources to ensure the timely processing and adjudication of the remaining cases and trials for crimes against humanity committed under the previous authoritarian regimes so as to prevent any form of impunity and provide, to the greatest extent possible, full redress and rehabilitation to the victims; 17