CAT/C/VNM/CO/1 incidence of coerced confessions and suspicious deaths in custody. It is also concerned that specific training on the provisions of the Convention, and in particular the absolute prohibition of torture, is not part of the training of public officials such as police and law enforcement officers, investigators, judicial personnel, military officers and prison staff. In addition, the Committee is concerned that the Manual on the Effective Investigation and Documentation of Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment (the Istanbul Protocol) is not part of the mandatory training provided to medical personnel and other persons concerned in the custody, interrogation or treatment of persons subjected to any form of arrest, detention or imprisonment (art. 10). 41. The State party should: (a) Ensure that police and law enforcement officers, investigators, judicial personnel, military officers and prison staff receive training and instruction on the provisions of the Convention and in particular on the absolute prohibition of torture; (b) Provide specific training to investigators on the use of non-coercive methods of investigation and interrogation that comply with international standards, so that they avoid committing acts that may amount to torture; (c) Communicate to all relevant public officials that breaches of the Convention will not be tolerated and that such breaches will be investigated and perpetrators prosecuted; (d) Ensure that medical personnel and other persons involved in the custody, interrogation or treatment of persons subjected to any form of arrest, detention or imprisonment receive mandatory training on the Istanbul Protocol; (e) Develop and implement a methodology to assess the effectiveness and impact of any such training. Data collection 42. The Committee urges the State party to establish an effective system for collecting statistical data at the national level, disaggregated by sex, age, ethnicity or nationality, location, socioeconomic and other relevant status, which should include information about complaints, investigations, prosecutions, trials and convictions in cases of torture or ill-treatment, as well as on measures of redress, particularly compensation and rehabilitation, provided to the victims or their relatives. The system should furthermore include disaggregated information on the use of the death penalty and the number of prisoners on death row, on the overall prison population, including the number of unsentenced detainees, and on trafficking in persons. Follow-up procedure 43. The Committee requests the State party to provide, by 7 December 2019, information on follow-up to the Committee’s recommendations on investigating all cases of excessive use of force, including cases of torture and ill-treatment by law enforcement officials and deaths in custody; on establishing a central register of detention regarding all persons at all stages of their deprivation of liberty; and on prosecuting and punishing all officials who may have allowed evidence to be obtained as a result of torture, including persons providing false testimony and false documents (see paras. 21 (a), 17 (b) and 29 (c) above). In that context, the State party is invited to inform the Committee about its plans for implementing, within the coming reporting period, some or all of the remaining recommendations in the concluding observations. Other issues 44. The Committee encourages the State party to consider making the declarations under articles 21 and 22 of the Convention and to consider withdrawing any declaration that limits the scope of the Convention. 12