She explains that the emphasis on deterrence in law enforcement is fading, and she favors replacing this emphasis with concepts of legitimacy and procedural justice. "Legitimacy" is achieved by a police agency when officers enforce laws fairly according to law and the rules that limit their power. Implications of an emphasis on legitimacy are drawn for police stops, particularly pervasive stops as a policy emphasis. Racial profiling by police is part of the discussion. Differences between deterrence and legitimacy is these contexts are discussed. The application of these principles in a Chicago project is described.