Impaired driving is illegal and deadly.
• Drugs can cause impairment. • In every State and the District of Columbia, impaired driving is illegal. • Whether by drugs, alcohol, or a combination, impaired driving puts the driver, their passengers, and other road users at risk. • In NHTSA’s National Roadside Survey conducted from 2013–2014, 20 percent of the sampled weekend nighttime drivers in traffic tested positive for potentially impairing drugs.
Science has not caught up yet. But it is getting closer.
• Trends show an increase in the number of drivers testing positive for marijuana and other drugs that can impair driving, but specific drug concentration levels can’t be reliably equated with a specific degree of driver impairment. • Predicting real-world crash risk is challenging, however, studies show that marijuana impairs psychomotor skills, lane tracking, and cognitive function. • Collecting drug-impaired driving data is critical to understanding the scope of the problem.
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