In this scenario, the book assesses the new framework within which criminal lawyers and practitioners need to operate under the Lisbon Treaty (Part I), and focuses on the different versions of its provisions concerning cooperation in criminal matters, which will need to be implemented at the national level (Part III). The book analyses the issues raised by multilingualism in the EU decision-making process and subsequent interpretation of legal acts from the viewpoint of all the players involved (EU officials, civil, penal and linguistic lawyers: Part II), explores the possible impact of the EU legal acts concerning environmental protection, where the study of ascending and descending circulation of polysemantic words is especially relevant (Part IV), and investigates the new legal and linguistic concepts in the field of data retention, protection of victims, European investigation orders and coercive measures (Part V).