Exposure to traumatic or stressful events has for some time been linked to symptoms of trauma in a minority of individuals. Those at risk of exposure to traumatic events by virtue of their occupation, such as police officers who routinely face traumatic, sad and stressful incidents, stand to receive significant benefit from learning to manage their reactions to such events. The overall aim of this study was to develop and evaluate a resilience training program designed specifically to help new-recruit police officers mitigate stress reactions and the use of drugs and alcohol. The trial of resilience training was carried out with new-recruit Victorian police officers (n = 281, with participants receiving either resilience training or control training in groups, at different intervals over 20 weeks. Findings at six-month follow-up indicate that more than half of all participants reported a total substance or alcohol involvement score that was at risk level. This suggests the need for clear, comprehensive and widely known policies and procedures to be put in place to identify and support those with either substance or alcohol use problems. The current resilience study during academy training suggests beneficial effects on workplace burnout, negative affect,relationship satisfaction and trauma symptomatology, which appear to be increasing in strength over time. Overall, the results of this study provide support for the inclusion of resilience training in the overall training of new-recruit police officers. (Executive summary, edited)