More than a million people have died in traffic crashes in the United States since 1966, the year of the National Traffic and Motor Vehicle Safety Act, which led to the creation of the National Highway Traffic Safety Administration, or NHTSA. The proportion of all crashes in which alcohol is involved also has declined. The declines in crash risk and the numbers of alcohol-involved crashes are attributable to several factors, including the effectiveness of public information and education programs, traffic safety legislation, a general aging of the population, and law enforcement effort. NHTSA research contributed to the improved condition, in part, by providing patrol officers with useful and scientifically valid information concerning the behaviors that are most predictive of impairment. Continued enforcement of DWI laws will be a key to saving lives in the future. For this reason, NHTSA sponsored research leading to the development of this DWI detection guide. Many things have changed since 1979, but like the original training materials, the new detection guide describes a set of behaviors that can be used by officers to detect motorists who are likely to be driving while impaired. This detection guide contains: (1) the DWI Detection Guide, (2) a summary of the research that led to the guide, (3) explanations of the 24 driving cues, and (4) a description of post-stop cues that are predictive of DWI. The research suggests that this training guide will be helpful to officers in detecting impaired motorists, articulating observed behaviors on arrest reports, and supporting officers' expert testimony.


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