[ConservingFreedom]

From the original report (http://www.nhtsa.gov/staticfiles/nti/pdf/812118-Roadside_Survey_2014.pdf):

"At the current time, specific drug concentration levels cannot be reliably equated with a specific degree of driver impairment."

"Alcohol, in comparison, is more predictable. A strong relationship between alcohol concentration and impairment has been established, as has the correlation between alcohol concentration and crash risk."

[Mears]

“”At the current time, specific drug concentration levels cannot be reliably equated with a specific degree of driver impairment.”

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Driving on prescription drugs terrifies me.

We had an awful accident in Boston some years ago due to prescription drugs. Two young men burned to death when rear-ended by an impaired driver.

.