Abstract: This article reflects scientific research on the existing court decisions in criminal procedural law. It is stated that the recognition of court decisions as evidence in criminal cases is strict for other courts as well as for preliminary investigation and inquiry authorities. There is no institution of prejudice in our current criminal-procedural legislation. In this regard, when the legal system of foreign countries is studied, it is expressed by the fact that the issues of prejudice and precedent are interrelated, and their negative and positive aspects are shown on the example of national legislation. This article explains the prejudicial importance of court decisions in evidence and proof, and the procedures for their use.