In cases of human disappearance, sometimes facts appear indicating the possibility of causing his death and hiding the corpse. Such hypotheses are formulated not only by law enforcement authorities, but also by the local community, and the family is slandered in them, sometimes friends of the missing person. The study, based on examples from expert practice, showed the usefulness of the polygraph test to verify such personal ver-sions, including the exclusion of wrongly suspected persons close to the missing person (father and mother). In the course of such a study, several research techniques can be used, which have been shown to increase the accuracy of the results and sometimes allow the killer to be exposed.
