This book provides practical guidance on what remains the single most important statutory basis for police duties and powers in England and Wales, the Police and Criminal Evidence Act 1984 and its Codes of Practice. The law is explained in a clear, informative and accessible manner. With the aid of flow-charts and practical case studies, the book gives excellent guidance on how the procedures and requirements of the Act apply to common every day scenarios facing police officers and other persons charged with the investigation of offences. Covers changes introduced by the new Codes of Conduct, the Criminal Justice Act 2003 and the Serious Organised Crime and Police Act 2005. Includes the full text of the Act, as amended and the latest version of the Codes of Practice which were implemented on 1st January 2006. An essential reference for the busy police officer or legal practitioner.