[manc]

http://www.philly.com/philly/health/topics/HealthDay684515_20140204_Fatal_Car_Crashes_Involving_Pot_Use_Have_Tripled_in_U_S___Study_Finds.html

This is more of a legit article form the medical press

http://medicalxpress.com/news/2014-05-marijuana-involved-fatal-accidents-colorado.html

The WP has hardly a significant study and seems to be pushing their agenda for a national legal drug.

[Ken H]

Medical Marijuana Laws, Traffic Fatalities and Alcohol Consumption Study (Nov 2011 )

Using state-level data, we examine the relationship between medical marijuana laws and a variety of outcomes. Legalization of medical marijuana is associated with increased use of marijuana among adults, but not among minors.

In addition, legalization is associated with a nearly 9 percent decrease in traffic fatalities, most likely to due to its impact on alcohol consumption. Our estimates provide strong evidence that marijuana and alcohol are substitutes.

http://www.scribd.com/doc/74180276/Medical-Marijuana-Laws-Traffic-Fatalities-and-Alcohol-Consumption-Study