CAT/C/GRC/CO/7 prohibition of torture, and that they are fully aware that violations will not be tolerated and will be investigated and that those responsible will be prosecuted and, on conviction, appropriately punished; (b) Develop training modules for the police and other law enforcement officers on non-coercive interviewing and investigation techniques; (c) Ensure that all relevant staff, including medical personnel, are specifically trained to identify cases of torture and ill-treatment, in accordance with the Manual on the Effective Investigation and Documentation of Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment (the Istanbul Protocol); (d) Develop and implement a methodology to assess the effectiveness and impact of educational and training programmes relating to the Convention and the Istanbul Protocol. Hate crime 46. While acknowledging the legislative and other measures taken by the State party to tackle hate crime, the Committee is concerned by reports it has received reflecting an increase in the incidence of racist and xenophobic violence, especially against refugees, migrants and members of the Roma community, and a significant rise in the number of incidents where law enforcement officials have been the perpetrators or have otherwise been involved. The Committee is also concerned at reports of widespread impunity for such crimes (art. 16). 47. The State party should: (a) Systematically investigate all forms of hate crime, including violent acts, prosecute perpetrators and, if they are found guilty, convict and punish them; (b) Provide training on hate crime to law enforcement officials and the judiciary in order to improve their initial handling of hate crime reports and the subsequent investigation and prosecution of such crime. Human rights defenders and humanitarian workers and volunteers 48. The Committee is seriously concerned about consistent reports of intimidation and harassment of human rights defenders and humanitarian workers and volunteers. In that connection, it regrets that only scant information has been provided by the State party regarding the cases raised by the Committee, including the prosecution and later acquittal of three Spanish firefighters, Manuel Blanco, José Enrique Rodríguez and Julio Latorre, and two Danish volunteers, Salam Aldin and Mohammed el-Abbassi, who were accused of trying to help migrants enter Greece via the island of Lesbos, and the arrest and pending trial of foreign NGO volunteers Sarah Mardini and Sean Biner on people-smuggling, espionage and money-laundering charges (art. 16). 49. The Committee urges the State party to: (a) Ensure that human rights defenders and humanitarian workers and volunteers are protected against threats and intimidation, and to allow them the necessary latitude to carry out their activities; (b) Ensure that human rights defenders and humanitarian workers and volunteers are not prosecuted for engaging in aid work, including by participating in maritime search-and-rescue activities. The State party should refrain from detaining and persecuting humanitarian workers and volunteers as a means of intimidating them or discouraging them from delivering vital emergency assistance to refugees and migrants. Trafficking in persons 50. While taking note of the information provided by the delegation on the State party’s efforts to combat trafficking in persons, the Committee remains concerned at the slowness of the screening procedures to identify potential victims, especially among asylum seekers 11