The DUI Investigation Handbook details the DUI investigation process from the initial observations of driving, the first contact with the driver, and the administration of field sobriety tests. This book takes an objective view of the DUI investigation process and what law enforcement must do to properly and ethically proceed with each phase of the DUI investigation. Additionally, this book provides practical material about how to administer field sobriety tests according to NHTSA protocol, and what situations must be avoided in order to retrieve reliable results. Finally this book details how to objectively, honestly and persuasively complete the written DUI investigation and report, and how to successfully testify in court. The DUI Investigation Handbook is a must for every DUI law enforcement officer and any individual in the DUI field, including prosecutors and DUI defense attorneys.