Keith Bechtel 
Driving While Impaired [PDF ebook] 
Confronting Defense Challenges and Guidance for Law Enforcement and Prosecutors

While common in occurrence, the evidence needed to prove guilt in impaired driving cases is complex, often requiring expert testimony to assist the trier-of-fact in determining what happened. As in any profession, those who work in it sometimes take for granted the complex nature of our legal system and presume others understand it as we do, which oftentimes is not the case. To fill that void, this publication provides an overview of the criminal justice system for people who will likely encounter it through their roles as expert witnesses.