This publication reviews the policies and institutional mechanisms for countering police corruption in several EU member states. To be effective, anti-corruption efforts should be based on a system of independent and mutually accountable institutions which are sufficiently empowered to implement their objectives. This report emphasises the last two decades of experience in the UK, Belgium and Austria in modernising their anti-corruption policies and institutions. In addition to the institutional and legal framework, concrete measures and methods (risk assessment, integrity tests, etc.) are also examined. The Bulgarian and Romanian experience in countering corruption in law enforcement institutions is also reviewed with an emphasis on some of the main problems and gaps that undermine effective counter measures.