Since 2004, the European Arrest Warrant (EWA) provides for a swift procedure for extradition between EU member states. The smooth functioning of the EWA ultimately relies on judicial authorities trusting the validity of warrants issued by their counterparts in another EU member state. This presumption of mutual trust among EU member states’ judicial authorities appears to be ill-founded, however, says Asif Efrat. In his article “Assessing mutual trust among EU members: evidence from the European Arrest Warrant” published in the Journal of European Public Policy, Asif provides evidence from the United Kingdom and Ireland, indicating that British and Irish authorities “surrender considerably more individuals to those members with better-quality justice systems and a stronger respect for human rights.” Asif’s findings have implications for policy-makers interested in fostering cross-country efforts to combat crime: Unless differences in the legal standards and human rights safeguards across national judicial systems are smoothed, cross-country cooperation on supressing crime is likely to stall.