The Cambridge Police Executive Programme (MSt in Applied Criminology and Police Management) is a two year part-time course which offers a globally relevant framework for preserving and enhancing democratic policing in the face of international challenges through developing senior leaders in policing, law enforcement and associated organisations. Our commitment to precision in targeting, testing and tracking police intrusions on public liberty using the best empirical and statistical evidence available provides a key tool for the kind of public ''dialogic'' strategy for maintaining police legitimacy developed at Cambridge. Our theoretical and empirical development of the concept of residual general deterrence provides the basis for refuting claims that police can be abolished without major increases in violent crime.For all our mid-career students (all police leaders or analysts from around the UK and world) enrolled on our part-time MSt Degree course, it offers an intellectual foundation for both police reform and public support.