Driving drugged may be more common than you think

This is London, Evening Standard :
"Drug-driving may be more of a problem than drink-driving, it is claimed, after more than half of the motorists killed in accidents in one police area were found to have taken drugs."

This story is from England, but there is good reason to believe the problem may be serious on this side of the pond as well. In the 90s (if memory serves) NHTSA ran a survey of drivers stopped for reckless driving not involving accidents on an interstate highway in a metro area in the southeast. Drivers were given immunity if they agreed to submit a blood sample. A high proportion tested positive for one or more illegal drugs.

And the problem is not limited to illegal drugs. Many drivers are impaired by various legal prescription or over-the-counter medications, particularly anti-histamines. Something to think about as you head out your driveway in the morning, especially in ragweed season.