'A welcome addition that has drawn together a series of chapters from leading police officers, lawyers and academics, on an area of police work which can sometimes be ambiguous, occasionally uncharted, and where legislation presents the uninitiated with periods of bafflement and confusion. [The editor] does go someway to removing the mystery about this area of policing': Brief (the voice of Greater Manchester Police). 'A comprehensive and detailed overview of CHIS related considerations': Maurice Collins, Bucks New University. 'A comprehensive and easy to follow / research text that covers a wide range of matters relating to informants and aspects of undercover police work. There are few texts dedicated soley to this area and as such this book will be of great value to professionals, academics, students and others who are are concerned with this important area of criminal investigation': Peter Hall, Coventry University.