Informants and Undercover Investigations is a comprehensive work on a subject that has traditionally been shrouded in secrecy. Based on recognized practices and case law, this book examines frequently encountered informant issues and provides guidance on how to successfully operate an informant. It identifies informants as one of the most unstable components of the criminal justice system but emphasizes the value of a closely controlled informant in a criminal investigation. With case studies and appendices, this text also examines the US Marshal’s Witness Security Program and reviews current local, state, and federal cases for best practice protocols.