- Over the years the European Union has expanded its legislation in the area of criminal law, criminal procedure and co-operation in criminal matters. This process led to an endless number of conventions, framework decisions, joint actions, directives and other legal instruments. Materials on European Criminal Law is a collection of legal instruments including all legal materials that are relevant for the practice of the Member States of the European Union in one concise volume. It is useful for practitioners, academics and students alike. About the author André Klip is Professor of criminal law, criminal procedure and transnational criminal law at Maastricht University. He is the author of European Criminal Law. An Integrative Approach published in its second edition (2012) by Intersentia.