Judicial cooperation in criminal matters is universally considered to be of paramount importance for the smooth functioning of the European area of freedom, security and justice without internal frontiers. In the European Union, this goal was inter alia pursued by adopting normative acts resting upon the principle of mutual recognition. The crucial instrument which applied this principle to the gathering and transfer of evidence in criminal cases is Directive 2014/41/EU regarding the European Investigation Order in criminal matters. There is however a plethora of theoretical and practical questions which aroused with the adoption of the new directive. This is why seven higher education and research institutions teamed up to cooperate in a project called European Investigation Order – Legal Analysis and Practical Dilemmas of International Cooperation – EIO-LAPD.