Keyword: «professional judgment»

The article considers the ratio of participation of individual subjects of proof – a specialist and expert in two different character types of proceedings – criminal and constitutional. The author analyzes the opinions of scholars on the concept of "professional judgment / expert" and the ability to attract the aforementioned individual lawyer. On the basis of constitutional and criminal law study concluded that the evidence of the parties and the court activity, which occupies a central place in the criminal process, is practically absent in the constitutional proceedings.