Digital evidence - evidence that is stored on or transmitted by computers - can play a major role in a wide range of crimes. Though an increasing number of criminals are using computers and computer networks, few investigators are well versed in the evidently, technical and legal issues related to digital evidence. This book explains how computer networks function, how they can be involved in crime and how they can be used as a source of evidence. Readers will learn about relevant legal issues and ber introduced to deductive criminal profiling, a systematic approach to focusing an investigation and understanding criminal motivations.