The reconvictions of mentally disordered offenders—how, when, and where?

BACKGROUND: Little is known about the recidivism of mentally disordered offenders after discharge from forensic psychiatric services. This is problematic because such knowledge could (i) help professionals who encounter this group to better plan interventions to prevent recidivism, (ii) clarify the rates of recidivism post-discharge from forensic psychiatric care and (iii) further develop instruments for specific risk assessment. The aim of this study was to investigate the new crimes of mentally disordered offenders who had been reconvicted after discharge from forensic psychiatric care. METHODS: Included in this study were all individuals (n = 1142) who had been discharged from forensic psychiatric care in Sweden during 2009–2018, were included in the Swedish National Forensic Psychiatric Register, and had been reconvicted in a criminal court within the follow-up period of 2009–2018 (n = 157, 14% of the population). The follow-up times of the discharged patients within the period varied from 4 to 3644 days, (m = 1697, Md = 1685). Retrospective registry data along with coded data from criminal court judgments (n = 210) were used to create a database. Kaplan–Meier survival analysis and descriptive statistical analysis was performed. RESULTS: 75% of included individuals were reconvicted for at least one violent crime, but only 9 individuals were reconvicted for a serious violent crime, which can be compared to the 44 individuals with serious violent index crimes. The most common crime was “Other violent”. The most common sentence was probation. The offender’s most common relationship to the victim was having no known relationship, followed by the victim being a person of authority. The most common circumstance of the crime leading to the reconviction was that it occurred without apparent provocation; other common circumstances were related to the exercise of public authority. The most common crime scene was a public place. CONCLUSIONS: Even though the reconvictions of this group included many violent crimes, there were very few serious violent crimes. The findings that the victims of the crimes of mentally disordered offenders are most commonly either unknown to the perpetrator or persons of authority, and that the crimes are often perpetrated without apparent provocation or reason, are important information for all professionals who encounter this group and should be taken into consideration to assess risk more accurately. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12888-022-03912-4.