The therapeutic tasks of forensic psychiatry range between the field of tension of "improvement" and "security" of entrusted persons. With respect to these aspects a paradoxical position of politics and society can be seen: whereas, regulatory security aspects are emphasized and detention measures are required with respect to the treatment measures according to 63 and 64 of the penal code (StGB) and any relaxation of rules is critically viewed, under pressure from the European jurisprudence preventive detention has been declared as a therapeutic measure. The superordinate priority of these measures is to prevent recidivism. This article firstly summarizes the empirical evidence concerning the efficacy of forensic psychiatric treatment of relevant disorders. From this it becomes obvious that the data are unreliable due to relevant risk aspects; therefore, the comparison of safety and therapeutic interests remains a challenging undertaking. A working approach that can successfully encompass both aspects is long-term case management, which is in a position to do justice to both the inpatient interaction and dynamic aspects of the treatment process beyond detention. Because the effectiveness of aftercare has been confirmed, we propose the implementation of forensic outpatient treatment as an alternative to forensic inpatient treatment.