These models represent various possible views of the relationship and rest on the concepts of compromise, complementarity, competition, and circumvention. The analysis shows that privatization has been developing throughout the postwar period and is not a product of recent governmental and market preoccupation with the privatization of services. The private security sector is unlikely to disappear in the foreseeable future. It is important to recognize that the proposals for further privatization are serious and influential. However, the further privatization of criminal justice system services must be challenged and resisted on the grounds of tradition and legitimacy, legality and accountability, and ethics and morality. A system is also needed to ensure the public regulation and accountability of private arrangements for policing and security. Notes and 75 references.