CAT/C/TKM/CO/2 (f) Have the legality of their detention challenged through an habeas corpus procedure and to have their detention recorded in a register at the place of detention and in a central register of persons deprived of their liberty, which their lawyers and family members can access. Conditions of detention in prisons 23. The Committee is concerned about the use of solitary confinement and the reduced regime for persons placed in solitary confinement, which has resulted in mental health problems and suicides. Additionally, while noting the renovations of existing facilities and the building of new ones during the period under review, the Committee remains deeply concerned about reports that inadequate material and hygienic conditions in places of deprivation of liberty, including continued severe overcrowding, inadequate bathing and toilet facilities, lack of access to an adequate quantity and quality of food, natural and artificial lighting, proper ventilation and health care, lack of outdoor activities and unnecessary restrictions on family visits continued during the period under review. The Committee is particularly concerned by reports that numerous prisoners may have died as a result of conditions at Ovadan-Depe prison. The Committee is also concerned about reports that prisoners with diseases such as active and multidrug-resistant tuberculosis continue to be held together with healthy prisoners, which results in high infection, morbidity and mortality rates among detainees. While noting the improvements made during the period under review in specialized facilities, the Committee is concerned about reports that prisoners with active tuberculosis are referred to the MR/K-15 hospital only when they are close to death or by bribing the relevant officials. The Committee is also concerned that the supervision of conditions of detention in detention facilities is not within the remit of judicial bodies (arts. 2, 11-14 and 16). 24. The Committee reiterates the recommendations contained in its previous concluding observations (see CAT/C/TKM/CO/1, paras. 18-19) that the State party should: (a) Ensure that solitary confinement remains an exceptional measure of limited duration; (b) Intensify further its efforts to bring the conditions of detention in places of deprivation of liberty into line with the United Nations Standard Minimum Rules for the Treatment of Prisoners (the Nelson Mandela Rules); (c) Reduce further prison overcrowding in all places of detention, including by renovating existing facilities and building new ones in accordance with international standards and implementing amended legislation allowing for alternatives to detention, in accordance with the United Nations Standard Minimum Rules for Non-custodial Measures (the Tokyo Rules); (d) Ensure that detainees are provided with adequate material and hygienic conditions, including bathing and toilet facilities, an adequate quantity and quality of food, adequate space for each prisoner, natural and artificial lighting, proper ventilation, health care, outdoor activities and family visits; (e) Separate healthy prisoners from those suffering from active tuberculosis in all detention facilities, implement the National Tuberculosis Prevention and Control Programme and the short-course directly observed treatment programme foreseen by it, and provide specialized medical care at the MR/K-15 hospital and at other medical facilities to prisoners suffering from active and multidrug-resistant tuberculosis and equip them with proper ventilation and Dezar devices; 8