Book excerpt: Texas DWI Defense: The Law and Practice ensures that you understand the chemical, biological and technological concepts and issues underlying DWI prosecution and defense in the State of Texas. The authors provide the most up-to-date information available on key areas of DWI law in the State of Texas including: DWI Investigations, Driving and Field Sobriety Testing, Drug Recognition Evaluation and Chemical Testing, Blood Alcohol Calculations, Pre-Trial Investigations and Motions, Practice, Plea Offers and Agreements, DWI Trial Procedures, and more. Many practical tools and applications designed to streamline and simplify the complex DWI defense process have been developed along with this book. They are all included on a bonus DVD so you can locate, review and print them out in a matter of seconds. The companion DVD includes NHTSA studies, articles and visual detection videos, as well as expanded sections on Texas law and procedure.