This Czech EPPO/OLAF volume deals with investigations related to EU fraud. Various laws, from customs to tax and corruption laws, are linked to the legislation of the European Union and the Czech Republic. Practitioners must be familiar with financial criminal law in order to handle fraud cases. The handbook covers key elements of the defence and discusses how investigations are conducted in the Czech Republic. The second section provides an overview of OLAF investigations conducted in the Czech Republic, focusing the checks carried out by the Anti-Fraud Office (OLAF) in accordance with Regulation 2185/96 and the Sigma Orionis case law of the ECJ. Prof. Dr Ji v{r '{i Jelinek and Tereza Ottov '{a have acted as the publication's national experts. While written in English, the volume includes footnotes that reproduce the original Czech legislation in the local language. Easily navigable with the help of visual symbols, it is designed as a quick reference tool for academics, students, practitioners and other interested readers.