The European Union is today a major player in many policy areas, going from classic economic fields as competition policy, agriculture and fisheries policy to new emergent fields as environmental policy, arterial intelligence policy, security and foreign policy and criminal justice policy. These policies comes with an increasing level of EU regulation, having also a substantive impact on the harmonization of national policies and regulations. This expansion of EU competence naturally also places new demands on their enforcement, especially when it comes to investigations with the aim of...