Double Jeopardy also describes a three-part conceptual model that begins with the obligation of society to provide specialized mental health care treatment to persons with mental illness who are in detention—the custodial obligation. Grisso carefully outlines the argument that the obligation to provide diagnostic and treatment services is not legally avoidable. On these grounds, far more services need to be provided than are currently available. The author then moves to the issue of due process for juveniles and speaks to the issues of Miranda warnings, competence, developmental capacity to understand proceedings, and the due process rights that are ostensibly guaranteed to all U.S. citizens. Often these rights are effectively not extended to juveniles, even though these youths are going to end up in adult courts. For example, children who are developmentally immature, mentally retarded, or mentally ill are not able to understand their rights.