En af de vanskeligheder, som vi står over for, er, at vi har forskellige retssystemer i EU 's medlemsstater, som har opbygget retlige organer og skabt præcedens.
Some courts have put a question mark about the operation of the European Arrest Warrant, whether as regards its transposition into international law by the mechanism used or as regards the way that certain courts have interpreted elements of the arrest warrant process.