Data retention regimes in many Member States have been changed over the past several years or are currently being reviewed in an attempt to bring them in line with the requirements of the Court of Justice of the European Union (CJEU). 

Based on the responses to a questionnaire provided by all 27 Member State representatives of the European Judicial Cybercrime Network (EJCN), the report gives an overview of the legal developments concerning data retention in the EU. Furthermore, it aims to provide a practitioner-based assessment of the impact of the CJEU case-law on the collection of evidence and judicial cooperation in criminal matters.