This book, the second volume of Crime Scene Management in Forensic Sciences, reviews the role and impact of forensic evidence in criminal investigations. It also addresses the importance of post mortem examination in criminal cases. The book investigates the use of insects and arthropods to estimate post mortem intervals during forensic investigations. Further, it discusses the physiological effects of xenobiotics at the time of death, based on their concentration and distribution in the body at autopsy. Importantly, it also discusses digital forensic investigation, which can be used for the analysis of digital evidence produced at a court of law. Lastly, it defines the structure and legal framework of these forensic evidences for the effective administration of the criminal justice system. It is an excellent source of information for forensics scientists and legal professionals.