Since the end of the Second World War, police cooperation has experienced several transformations affecting the conduct of law enforcement operations across jurisdictions. These critical changes emerged from global legal, political and socioeconomic trends that constantly redefining the nature, structure and the role of actors involved in policing cooperation. For instance, the creation of vast free trade zones in North America, Europe and Asia has provided an important momentum for collaboration and coordination among national justice systems and the protection of the sovereignty of states. Moreover, the evolution of transnational criminal networks and the internationalization of terrorist activities have directly contributed to the multiplication of law enforcement and intelligence initiatives that transcends local and national jurisdictions. The so-called wars on crime, drug and terrorism ranging from 1960’s to 2010’s have generated the deployment of a formidable web of policing activities across the globe. In the 21st Century, a complex assemblage of public and private actors conducts police cooperation activities. These actors operate at several levels of geographical jurisdictions and cooperate through different organizational structures and legal frameworks.