But, nearly one-quarter of drivers tested positive for at least one drug that could affect safety, which has been conducted five times during the last 40 years.
Drivers with evidence of drugs in their system on weekend nights climbed from 16.3% in 2007 to 20% in 2014, and those with marijuana in their system grew by nearly 50% during that same period.
Yes, but what you fail to point out is "marijuana in their system" means they have used it within the last 30 days, even though the effects of marijuana only last a few hours. Also it is important to note that a new study shows that marijuana use does not affect your driving: http://college.usatoday.com/2015/02/17/new-study-shows-no-link-between-marijuana-use-and-car-accidents/
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