This text stresses the practical procedures, techniques, and applications of private and public investigations to provide students with a solid foundation in criminal investigation. It seamlessly integrates coverage of modern investigative tools alongside discussion of established investigation policies, procedures, and techniques for the law enforcement officer. The 8th Edition features updated, enhanced coverage of such important topics as terrorism and homeland security, cybercrime, forensics and physical evidence, federal law enforcement investigations, report writing, crimes against children, photography and sketching, preparing and presenting cases in court, and identity theft.