Digital evidence, which is stored on or transmitted by computers, can have a major role in a wide range of crimes, including homicide, rape, abduction, child abuse, solicitation of minors, child pornography, stalking, harassment, fraud, theft, drug trafficking, computer intrusions, espionage, and terrorism. Although an increasing number of criminals are using computers and computer networks, few investigators are well-versed in the evidentiary, technical, and legal issues related to digital evidence. Consequently, digital evidence is often overlooked, collected incorrectly, and analyzed ineffectively. This work explains how computers and networks function, how they can be involved in crimes, and how they can be used as a source of evidence. In addition, readers will learn about relevant legal issues and will be introduced to deductive criminal profiling, a systematic approach to focusing an investigation and understanding criminal motivations. The accompanying CD-ROM contains simulated cases that integrate many of the topics covered in the text. It teaches users the components of computer networks, the use of computer networks in an investigation, the abuse of computer networks, privacy and security issues on computer networks, and the law as it applies to computer networks. Appended summary of resources and multimedia supplement, a glossary, and author and subject indexes