CAT/C/CHN/CO/5 objected to the procuratorate’s conclusion on the cause of the death (arts. 2, 11, 12, 13 and 16). 25. The State party should provide the information and statistical data referred to in paragraph 23 of the present document, with a view to assessing its compliance with its obligations under the Convention. In addition, the State party should take the necessary measures to ensure that: (a) All instances of death in custody, allegations of torture and ill-treatment and refusal to provide medical treatment are promptly and impartially investigated by an independent body other than the procuratorial authorities; (b) Those found responsible for deaths in custody that result from torture, ill-treatment or denial of medical treatment are brought to justice and, on conviction, adequately punished; (c) Detained persons have access to adequate medical care, including to a doctor of their choice. Solitary confinement and use of restraints 26. The Committee is concerned that the State party considers solitary confinement as a “management method” in detention centres, which is applied to all “class 1- major safety risk” detainees, including detainees at risk of self-harm, suspected of having mental illnesses and those who “pick quarrels and provoke troubles”. Solitary confinement can also be imposed in compulsory isolation drug treatment centres when persons undergoing drug treatment are not “reformed through education��� or do not obey discipline, among many other grounds. The Committee regrets the lack of relevant statistical data on the use of solitary confinement in both instances, as well as information on its maximum duration. It also regrets the lack of information with regard to the regulation and due process rights concerning the use of restraints. In this regard, the Committee expresses concern at the State party’s explanation that the use of the so-called “interrogation chair” is justified “as a protective measure to prevent suspects from escaping, committing self-injury or attacking personnel”, which is highly improbable during an interrogation (art. 16). 27. The State party should: (a) Limit the use of solitary confinement as a measure of last resort, for as short a time as possible, under strict supervision and with the possibility of judicial review, in line with international standards. The State party should establish clear and specific criteria in its regulations for decisions on solitary confinement, indicating the conduct, type and maximum duration; (b) Prohibit the use of solitary confinement for an indefinite period on persons with intellectual or psychosocial disabilities, juveniles, pregnant women, women with infants and breastfeeding mothers in prison; (c) Ensure that detainees’ due process rights are respected when subjecting them to disciplinary actions in general and solitary confinement in particular; (d) Avoid the use of restraints as much as possible or apply them, only if strictly regulated, as a measure of last resort, when less intrusive alternatives for control have failed and for the shortest possible time. The use of the so-called “interrogation chairs” during interrogations should be prohibited; (e) Compile and regularly publish comprehensive disaggregated data on the use of solitary confinement and restraints, including related suicide attempts and selfharm. 8