A proportion of ex-military personnel who develop mental health and social problems end up in the Criminal Justice System. A government review called for better understanding of pathways to offending among ex-military personnel to improve services and reduce reoffending. We utilised data linkage with criminal records to examine the patterns of offending among military personnel after they leave service and the associated risk (including mental health and alcohol problems) and socio-economic protective factors.

Questionnaire data from a cohort study of 13 856 randomly selected UK military personnel were linked with national criminal records to examine changes in the rates of offending after leaving service.

All types of offending increased after leaving service, with violent offending being the most prevalent. Offending was predicted by mental health and alcohol problems: probable PTSD, symptoms of common mental disorder and aggressive behaviour (verbal, property and threatened or actual physical aggression). Reduced risk of offending was associated with post-service socio-economic factors: absence of debt, stable housing and relationship satisfaction. These factors were associated with a reduced risk of offending in the presence of mental health risk factors.

Ex-military personnel are more likely to commit violent offences after leaving service than other offence-types. Mental health and alcohol problems are associated with increased risk of post-service offending, and socio-economic stability is associated with reduced risk of offending among military veterans with these problems. Efforts to reduce post-service offending should encompass management of socio-economic risk factors as well as mental health.

With significant numbers of individuals in the criminal justice system having mental health problems, court-based diversion programmes and liaison services have been established to address this problem.

To examine the effectiveness of the New South Wales (Australia) court diversion programme in reducing re-offending among those diagnosed with psychosis by comparing the treatment order group with a comparison group who received a punitive sanction.

Those with psychoses were identified from New South Wales Ministry of Health records between 2001 and 2012 and linked to offending records. Cox regression models were used to identify factors associated with re-offending.

A total of 7743 individuals were identified as diagnosed with a psychotic disorder prior to their court finalisation date for their first principal offence. Overall, 26% of the cohort received a treatment order and 74% received a punitive sanction. The re-offending rate in the treatment order group was 12% lower than the punitive sanction group. ‘Acts intended to cause injury’ was the most common type of the first principal offence for the treatment order group compared with the punitive sanction group (48% v. 27%). Drug-related offences were more likely to be punished with a punitive sanction than a treatment order (12% v. 2%).

Among those with a serious mental illness (i.e. psychosis), receiving a treatment order by the court rather than a punitive sanction was associated with reduced risk for subsequent offending. We further examined actual mental health treatment received and found that receiving no treatment following the first offence was associated with an increased risk of re-offending and, so, highlighting the importance of treatment for those with serious mental illness in the criminal justice system.

Offenders with an intellectual disability pose a major challenge to Intellectual Disability Service providers in the Republic of Ireland. This is especially so as no national Forensic Intellectual Disability Service currently exists.

The Forensic Intellectual Disability Working Group of the Irish College of Psychiatrists was established in order to take steps to address this issue by establishing the level of need for a Forensic Intellectual Disability Service in Ireland and developing a college position paper.

No previous study has been carried out to measure offending behaviour amongst persons with an intellectual disability attending mental health services in Ireland.

A postal survey was undertaken targeting the lead clinicians of all Intellectual Disability Psychiatry, General Adult Psychiatry and Forensic Psychiatry Services in the Republic of Ireland. This survey requested anonymous data regarding service users with an intellectual disability and offending behaviour in this population.

Data relating to 431 service users was returned. Those reported to engage in offending behaviour were predominantly young males. Assault was the most common offence type. A significant number of serious offences such as unlawful killing, sexual assault and arson were reported.

There is an urgent need for the development of a Forensic Intellectual Disability Service in the Republic of Ireland. The current efforts of the National Forensic Mental Health Service to establish such a service by the creation of a post of Consultant Forensic Psychiatrist (special interest in intellectual disability) are to be welcomed.

The link between psychotic disorders and violent offending is well established; knowledge about risk of post-illness-onset offending across the full spectrum of psychiatric disorders is lacking. We aimed to compare rates of any offending and violent offending committed after the onset of illness, according to diagnostic group, with population controls.

A 25% random sample of the Danish population (n = 521 340) was followed from their 15th birthday until offending occurred. Mental health status was considered as a time-varying exposure in a Poisson regression model used to examine the duration from service contact to the offence.

Males with any psychiatric contact had an incidence rate ratio (IRR) of 2.91 [95% confidence interval (CI) 2.80–3.02] for any offending; 4.18 (95% CI 3.99–4.38) for violent offending. Associations were stronger for women (IRR 4.17, 95% CI 3.95–4.40 for any offending; 8.02, 95% CI 7.20–8.94 for violent offending). Risk was similar across diagnostic groups for any offending in males, while variation between diagnostic groups was seen for male violent and female offending, both any and violent.

Risk of offending, particularly violent offending, was elevated across a range of mental disorders following first contact with mental health services. The extent of variation in strength of effect across diagnoses differed by gender.