A book published by the National District Attorneys Association on better understanding the Toxicology for drug related DUI and how to better prosecute those types of cases. This new edition presents a clear and concise update on important issues from a prosecutorial standpoint. Drug prevalence, pharmacology, specimen selection and analytical testing are all discussed. Expert testimony is also addressed, including the limitations and challenges associated with the interpretation of results. It is without doubt that this new and updated monograph will continue to serve as a trusted resource to prosecutors that are engaged in this field.