CAT/C/LVA/CO/3-5 (d) That the Law on the Procedure of Detention on Remand stipulates that the space in multi-occupancy cells should be not less than 3m2 per person. The State party should: (a) Continue to take steps to improve the material conditions in all prisons and police detention centres with regard to infrastructure, hygiene and sanitary conditions, heating, living space and regime of activities, in particular for prisoners serving life sentences and remand prisoners, in accordance with the Standard Minimum Rules for the Treatment of Prisoners; (b) Ensure the provision of adequate medical, psychological and prompt dental health care for all inmates free of charge; (c) Ensure that the renovation of existing places of detention continues according to schedule; (d) Ensure the existence of impartial and independent mechanisms to monitor places of deprivation of liberty, deal with the complaints of inmates about their conditions of detention and provide effective follow-up to such complaints; (e) Ensure that the space provided should not be less than 4m2 per prisoner in multi-occupancy cells, in accordance with the standards of the European Committee for the Prevention of Torture and Inhuman or Degrading Treatment or Punishment. Inter-prisoner violence 20. The Committee is concerned at the persistence of inter-prisoner violence and the lack of investigation of such violence, especially in view of the high number of cases. It is further concerned at reports relating to instances of deaths in custody as a result of violence (arts. 2, 11, 12, 13 and 16). The State party should: (a) Enhance steps to reduce inter-prisoner violence, including by strengthening the monitoring and management of vulnerable prisoners and other prisoners at risk; (b) Continue and enhance the training of prison staff and medical personnel regarding communication with and managing of inmates and on detecting signs of vulnerability; (c) Strengthen the effectiveness of complaints mechanisms for reporting cases of violence or other abuses and enhance the financial and staffing capacity of the Ombudsman and other independent mechanisms to visit regularly all places of detention; (d) Promptly, thoroughly and impartially investigate all cases of interprisoner violence and deaths in custody, prosecute and punish those found guilty with appropriate penalties and provide redress to victims or their relatives. Use of restraints in prisons 21. The Committee is concerned by reports of unjustified use of restraints in prisons, such as the routine handcuffing of prisoners serving life sentences when outside their cells (arts. 2, 11 and 16). The State party should: (a) 8 Abolish the routine handcuffing of prisoners serving life sentences;