Substitution of concepts and competencies in the conclusions of forensic experts on "medical cases" as a negative trend in expert, investigative and judicial practice
. The conclusion of the Commission of forensic medical examination plays a key role in revealing the signs of the objective side of iatrogenic crimes. The notion of the defect of medical care in the legislation is absent, and in theory and in practice has not developed a unified approach to establish causality and its nature (direct or indirect). Due to the lack of necessary legal regulation in expert and legal practice, a number of customs have been formed that do not meet the requirements for the formation of a scientifically based private forensic methodology for investigating crimes and the purpose of criminal proceedings. The article describes the most common errors that have a negative impact on the process of investigation and resolution of socalled “medical cases”, due to which there is either an excessive accusatory or clearly exculpatory bias, which prevents the adoption of fair and reasonable procedural decisions. Ways to improve the methods of investigation of iatrogenic crimes, including the organization of forensic medical examinations in this category of cases, are proposed.