Blackstone's Police Manuals are the leading texts on police law. Endorsed by CENTREX, they are the only official reference work for police officers preparing for OSPRER promotion examinations and for police probationers. They cover all aspects of police law and procedure from a police officer's perspective. The 2006 editions have been extensively revised to incorporate all legislative developments and also include a number of case decisions and changes in policy. New legislation covered includes: the Asylum and Immigration (Treatment of Claimants etc) Act 2004, the Prevention of Terrorism Act 2005, the Children Act 2004, the Traffic Management Act 2004 and the Criminal Justice Act 2003.