Gil Kerlikowske's website
Scientific uncertainty complicates drug czar's claim
"More people are driving under the influence of drugs than are driving under the influence of alcohol. A recent roadside survey showed that 16 percent of the people tested, tested positive for illicit or licit drugs. That's significantly higher than alcohol."
— PolitiFact National
on Monday, April 5th, 2010
Even with a rigorous study, it can be hard to tell.