[Responsibility2nd]

Yes.

Start here and click away.

http://www.google.com/search?hl=en&q=nhtsa+marijuana&btnG=Google+Search&rlz=1R2ADBF_en&aq=f&oq=

[starlifter]

Thanks. Here's what I found, fifth reference:

NHTSA Accident Study Finds Drugs Not Big Danger on the Road, the Main Danger is Alcohol. Marijuana By Itself Not an Apparent Driving Hazard

The NHTSA report, “The Incidence and Role of Drugs in Fatally Injured Drivers,” by K.W. Terhune, et al. of the Calspan Corp. Accident Research Group in Buffalo, NY (Report # DOT-HS-808-065) is available from the National Technical Information Service, Springfield VA 22161

Thank you for your help.