This work offers a comprehensive and legally sound overall concept for internal investigations under German law. Due to its plain and comprehensible language, the enormous quantity of material it evaluates and the depth of the legal examination it conducts, the book will be of great value to anyone dealing with this controversial topic-either in practice or academically. Using numerous practical examples, the author answers questions such as the admissibility of internal investigations and the obligation to conduct them. He examines the legal limits of the most relevant investigative measures on the basis of all possible regulations, taking into account all conceivable modalities. Finally, he shows what may or must be done with the results of an investigation, in particular with regard to their disclosure, seizure and criminal procedural usability.