Criminal investigators need broad knowledge of such topics as criminal law, criminal procedure, and investigative techniques. The best resource for these professionals will distill the needed information into one practical volume. Written in an accessible style, the fourth edition of Criminal Investigation maintains the same reader friendly approach that made its predecessors so popular with students, professionals, and practitioners. Beginning with an overview of the history of criminal investigation, the book explores current investigative practices and the legal issues that constrain or guide them. It discusses the wide range of sources of information available, including the internet, individuals, state and local sources, and federal agencies and commissions. Next, the book discusses other investigative techniques, including interviewing and interrogation, informants, surveillance, and undercover operations. A chapter on report writing provides explicit instructions on how to capture the most critical information needed in an investigation. Additional chapters cover the crime scene investigation and the crime laboratory. The remainder of the book delves into the specific investigative protocols for individual crimes, including sex offenses, homicide, mass and serial murder, assault and robbery, property crimes, cybercrime, and narcotics. Concluding chapters focus on the police/prosecutor relationship and investigative trends. Each chapter includes a summary, a list of key terms, and review questions so that readers can test their assimilation of the material. Clear and concise, this book is an essential resource for every criminal investigator's toolbox.