Subject and Keywords:
The master thesis entitled: “Zasada wzajemnego zaufania państw członkowskich Unii Europejskiej jako podstawa budowania Europejskiej Przestrzeni Karnej” analyses the changing model of cooperation between EU Member States in criminal matters. The author tries to form a critical image of the EU and its Member States activities aimed at building the so-called European Criminal Area. The sphere which, like the single market with economic freedoms, postulates the creation of a single area in criminal matters with free movement of judicial and extrajudicial decisions in the EU. The author ask a question about the basis of this advanced form of cooperation between sovereign states. According to the doctrine, the most adequate justification for this new dimension of interstate cooperation is the principle of mutual trust. The thesis describes this phenomenon, which in the EU is going to replace a basic principle of international law - the principle of reciprocity. The author tries not only to evaluate the problem of vague legal character of the respective principle, but also to analyse the mechanisms of building and reinforcing mutual trust between the Member States and the consequences of its lack for further EU integration process.