This article discusses a comprehensive psychosocial program developed for a prison in California--the Special Needs Program for Inmate-Patients with Dementia (SNPID). It describes the individual steps of the program, their content and their application in a system that has safety and security as its highest priority. An important and innovatory aspect of SNIPD is the role of other inmates in supporting inmates with dementia. The article concludes that psychosocial interventions can be appropriately applied in prison settings and make a difference in the quality of life for inmate-patients with dementia.