According to a new article summarizing data from the Governors Highway Safety Association, blood tests of blood from the bodies of fatally injured drivers is showing that drugs are not more commonly found (43 percent of the time) than alcohol (37% of the time). That's a stark turn-around in the last 10 years or so, when in 2005 drugs were found in just 28 percent of drivers and alcohol in 41 percent. See http://www.msn.com/en-us/news/us/tiger-woods-and-americas-drugged-driving-problem/ar-BBBGwhZ?li=AA4ZnC&ocid=spartandhp for more information.   

It's getting pretty obvious, folks.  Don't drive when you are under the influence.