Confronted with the practical legal aspects of Peace Support Operations (PSO) in their daily work, the two authors realized that there was an urgent need for the international community of military and civilian lawyers, law enforcement agencies, policy makers, legal advisers and military commanders dealing with these types of missions to have a guidebook analyzing, questioning and providing some solutions to the practical legal aspects intrinsic in them and which are often known only to those who have been serving in the field. It was therefore decided to create a tool to record and diffuse the know-how acquired by those who have been directly confronted with these issues, in the field and at headquarters. Among the cutting-edge topics practitioners explore in "Peace Support Operations & Their Legal Implications" are human trafficking and illegal immigration in theatres of PSO such as the Balkans, arrest and detention of suspects of serious breaches of the laws of war, the relationship and role sharing of civilian law enforcement agencies and peacekeepers, the use of non-lethal and other weapons (e.g. riot control agents), criminal liability for breaches of international law and Rules Of Engagement. Contributions of a more strategic nature deal further with the complexities of Status of Forces Agreements and Memoranda of Understanding, the extraterritorial applicability of human rights obligations, the application of the law of occupation to peacekeeping forces, their new role and the relative problems in peace-building. The main objective of this guidebook is to provide the basis for further discussion, suggesting what should be done next, and to constitute a problem-solving tool for those deployed in the field, often secluded from the external world and confronted with difficulties to be solved immediately, under the pressure of time. The idea is to show them the path undertaken by others who have been confronted with similar problems and to share the knowledge an