This new edition presents the basic principles of criminal investigation in a practical, down-to-earth style. It discusses interviewing and interrogating suspects and witnesses, gathering and preserving evidence, conducting surveillance, writing reports, establishing modus operandi, and using technical resources, as well as current investigative procedures used in the handling of crime scenes. It also covers the prevention and suppression of crimes and the apprehension of criminals, and gives special attention to helping students understand the legal aspects of collecting and processing evidence to ensure that their work stands up in court.