Although many attorneys believe a court determination that a client is a mentally disordered sex offender (MDSO) is of benefit to the client, requesting commitment on this determination may be a serious mistake. Under an MDSO commitment, clients may serve more time in a State hospital than they would serve in prison for the same crime. Further, the client may face an extended term commitment hearing for additional confinement. Community outpatient treatment programs do not exist in every community. Finally, the MDSO commitment designation may be used to keep the client confined for a longer period of time than would have been allowed under normal sentencing procedures. On the other hand, an MDSO commitment at least holds the potential of benefiting the client, who may receive effective treatment, secure earlier release, or qualify for an excellent outpatient treatment program. In its most recent decision concerning MDSO's, the California Supreme Court adopted a parens patriae concept similar to the juvenile system. Rehabilitation and treatment are of primary importance. However, the court failed to address the issue of whether amenability to treatment is constitutionally mandated by due process, and thus this area of the law remains unresolved. The article provides 123 footnotes. (Author summary modified)