Objective. An attempt was made to establish firstly, the relationship between antisocial behaviours and schizophrenia, and secondly, the reasons for antisocial behaviour abatement in the course of the disease. Moreover, the problem was discussed of compulsory judgment of the patient 's non-accountability in chronic psychotic disorders.
Case. The diagnostic process was reported concerning a person who had manifested antisocial behaviours, sometimes of a considerable social noxiousness, since early adolescence. Although as early as in the school age there had been justification for diagnosing him with schizophrenia, the illness was diagnosed over a decade later, after the onset of exacerbated productive symptoms, especially auditory imperative hallucinations increasing the risk of aggressive and self-aggressive behaviours.
Commentary. Diagnostic doubts were due mostly to the apprehension that the diagnosis of a chronic mental disorder would be equipotent with the judicial decision about the patient 's non-accountability, in consequence of which he could not be deemed guilty and his activity could not be restrained.