Acknowledgements The OSCE Office for Democratic Institutions and Human Rights (ODIHR) and the Strategic Police Matters Unit within the OSCE Secretariat Transnational Threats Department (TNTD/SPMU), would like to thank Michael Kellett (former senior criminal investigator and human rights expert) for his major contribution to the development of the manual. ODIHR and TNTD/SPMU extend thanks to colleagues from the OSCE Transnational Threats Department/ Action against Terrorism Unit and the OSCE field operations who collaborated on this project. ODIHR and TNTD/SPMU are also grateful to the following experts that provided feedback, comments and inputs during the drafting of the manual: Anja Bienert, Senior Programme Officer, Police and Human Rights Programme, Amnesty International, Dutch section Nihad Bunar, Professor, Department of Child and Youth Studies, Stockholm University and Swedish National Police Academy Ulrich Garms, Programme Officer, Terrorism Prevention Branch, United Nations Office on Drugs and Crime Aydan Iyigüngör, Programme Manager, Freedoms and Justice Department, European Agency for Fundamental Rights Friedrich Schwindt, Police Director (retired), international consultant on human rights and police reform Cristina Sganga, international consultant on human rights and law enforcement Anna Tsitsina, Adviser, Terrorism Division, Council of Europe Steve Wessler, international consultant on human rights