Acknowledgments This guide was prepared within a joint project by the OSCE Office for Democratic Institutions and Human Rights (ODIHR) and Penal Reform International (PRI). Initial drafts of the document were developed by Lucile Sengler, as lead consultant, with input by Matthew Pringle as a detention monitoring expert. A large number of national and international experts have contributed to the development of this document, starting from the first consultation meeting ODIHR and PRI hosted in Warsaw, in December 2017, and carrying on through individual interviews, peer review of initial drafts, further research and subsequent stages. These experts have included representatives from the UN Subcommittee on Prevention of Torture (SPT); the Secretariat of the European Committee for the Prevention of Torture (CPT); the Council of Europe’s Council for Penological Cooperation (PC-CP); the International Committee of the Red Cross (ICRC); and the United Nations Office on Drugs and Crime (UNODC); as well as a number of national authorities and prison services; national preventive mechanisms (NPMs); civil society representatives from the Albanian Rehabilitation Centre for Trauma and Torture (ARCT), Amnesty International Netherlands, the Association for the Prevention of Torture (APT) and the Open Society Justice Initiative (OSJI); independent international penal reform and human rights experts Paul English and Francis Sheahan; and colleagues from the OSCE Secretariat’s Transnational Threats Department/Action Against Terrorism Unit (TNTD/ATU). Maud Raimbault conducted preparatory research during the initial stages of the project that formed the basis for the subsequent development of the guide. 5