The paper analyzes prohibitions regarding the use of evidence ("exclusionary rules") in German law. In the introduction, the theoretical foundations, based on Beling's doctrine of the "prohibitions on evidence", are explained. Then, the concept of prohibitions on evidence is defined and the existing prohibitions are systematized (1.). Next, a distinction between explicit and implicit prohibitions (based on constitutional law) is proposed, and both are explained in detail (2. and 3.). Finally, the possibility of an extensive effect ("fruit of the poisoned tree") of these prohibitions is discussed (4.). [ABSTRACT FROM AUTHOR]