Criminality and violence feed the public debate and justify the adoption of measures in the area of policing: community policing; problem-solving policing; situational prevention; and technologies. On the other side, policing has become a plural subject - the technologies and the multiplicity of institutional agents that are involved in the delivery of security services. The diversification, fragmentation and dispersion of policing bring about questions regarding the accountability from the part of the agencies in charge of this service. How to make them responsible and to whom they are accountable are important questions for democratic governance.