Based on the analysis of the legislation of Belarus and Kazakhstan, the circumstances subject to identification and proof in the process of bribery investigation are considered. Establishing the circumstances subject to proof, enshrined in the criminal procedure codes of Belarus and Kazakhstan, does not ensure the full disclosure of these crimes, but forms the basis of the process of their preliminary investigation. The conducted study allows us to present the circumstances subject to establishment as a system of interrelated elements that ensure the objective disclosure of bribery. Understanding the circumstances of bribery is based on forensic knowledge, which helps to specify them in each specific case of investigation. It is concluded that in the process of disclosing and investigating bribery, the most effective method is forensic analysis of the activities of an official and the organization in which he serves.