Freedom, security and justice are three pillars of the European Union, as laid out by the Amsterdam Treaty of 1997. But the free movement of people, goods and capital has a downside: criminals can slip across borders too. The European arrest warrant aims to tackle this problem at an international level. As with other areas, the EU does not advocate harmonising arrest laws so as to avoid encroaching on a sensitive issue of national interest. Brussels thus accepts differences between member states and bases its policy on the mutual trust and common interests of EU countries in the judicial sphere. The European arrest warrant does away with the traditional extradition procedure, which requires that a suspect’s alleged offence be considered a crime both in the country that wants to extradite him and in the state which is to deport him. In the EU, the suspect can be extradited even if he cannot be charged in the country where he is staying.