Recent high profile cases have highlighted how forensic evidence can no longer be regarded as unassailable. As forensic practice and procedure becomes increasingly complex, lawyers, the police and the courts need to develop a better understanding of the evidence in order to effectively prosecute or defend criminal cases. This is a practical guide to understanding the uses, strengths and limitations of forensic practice. Advised by experts and written by lawyers in a modern, accessible style, Forensic Practice in Criminal Cases takes readers through the nature and uses of forensic evidence and explores specific areas of expertise. The book offers practical coverage of: - the types of forensic investigation which should be carried out - how investigations can go wrong - what further investigations need to be carried out - what documentary records of the investigation should exist - how to instruct a forensic scientist to provide or challenge scientific evidence. This is the only work dedicated to forensic practice within the context of criminal law. It will be welcomed by criminal lawyers, judges, magistrates, students, police officers and anyone interested in the criminal justice system.