This research focuses on assessing integrated physical and mental health interventions aimed at reducing offending behaviour amongst people with intellectual disabilities, a group that is overrepresented within forensic and institutional settings. Using randomized control methodology, the study analyzes the longitudinal outcomes of one dual-modality intervention of structured physical activity combined with cognitive-behavioral and other psychosocial therapies. Impact is measured across a 230-participant sample using various quantitative metrics, including changes in health parameters, psychiatric symptoms (GAD-7, PHQ-9), and recidivism risk scores. Results suggest important reductions in risk of offending were achieved, with synergistic benefits observed when both physical and mental health interventions were executed simultaneously. Further analysis uncovers strong predictive impacts of sustained improved health on behavior control, especially in high-risk subgroups. This research highlights the importance of integrated care frameworks for dual-diagnosis patients and provides evidence for the implementation of interdisciplinary policies regarding forensic disability services.