This product provides perspective on scientific standards and tests used to charge an individual with driving under the influence. Featuring leading DUI defense practitioners and experts, this volume discusses the observable behaviors and technological tests that are utilized as evidence of intoxication in a DUI case and discusses contributing factors that may skew these results. Emphasizing the importance of understanding how pre-existing medical conditions, improper test administration, misinterpretation of results, and mechanical failure can affect driver evaluation and testing, the authors provide case examples and court transcripts to illustrate how attorneys can overcome inaccurate results to successfully defend a client.