The source material provides excerpts from a Standardized Field Sobriety Testing (SFST) Participant Manual, detailing a comprehensive training curriculum developed by the National Highway Traffic Safety Administration (NHTSA) and the International Association of Chiefs of Police (IACP) for law enforcement officers. This curriculum focuses on DWI detection techniques, which are broken down into three phases: Vehicle in Motion, Personal Contact, and Pre-Arrest Screening, emphasizing the use of scientifically validated psychophysical tests such as the Horizontal Gaze Nystagmus (HGN), Walk and Turn (WAT), and One Leg Stand (OLS). A significant portion of the text addresses the physiology of alcohol absorption and elimination, while also discussing DWI deterrence strategies based on increasing the public's perceived risk of arrest. Additionally, the manual introduces the topic of drugged driving, outlining seven categories of impairing drugs and their indicators.

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