The article deals with the theory of identification and probabilistic conclusions of expert research. In the process of proving, the question of the probability of expert examination or expression of the probability of the considered versions is often addressed. In court proceedings, in many cases the expert is required to comment on the probability of one or the other version, in such cases it is necessary to express a subjective view of the assessed problem. Probabilistic expression of object identification is often an inevitable degree of knowledge in forensic research.