Great video, Gigi. I watched it three times.

:)

Did not know this:

The difference in risk between marijuana and alcohol can probably be explained by two things, Dr. Huestis and Dr. Romano both say. First, stoned drivers drive differently from drunken ones, and they have different deficits. Drunken drivers tend to drive faster than normal and to overestimate their skills, studies have shown; the opposite is true for stoned drivers.

“The joke with that is Cheech and Chong being arrested for doing 20 on the freeway,” said Mark A. R. Kleiman, a professor of public policy at the U.C.L.A. School of Public Affairs.

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Nor this:

A 21-year-old on his first bender and a hardened alcoholic will both wobble on one foot. But the same is not necessarily true of a driver who just smoked his first joint and the stoner who is high five days a week. In another study, 50 percent of the less frequent smokers failed the field test.

In one study, only 30 percent of drivers who had smoked marijuana failed a sobriety test. 

http://www.nytimes.com/2014/02/18/health/driving-under-the-influence-of-marijuana.html?_r=0