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  1. Diverboone
    Research Note
    Drug and Alcohol Crash Risk

    This study of crash risk found a statistically significant increase in unadjusted crash risk for drivers who tested positive for use of illegal drugs (1.21 times), and THC specifically (1.25 times). However, analyses incorporating adjustments for age, gender, ethnicity, and alcohol concentration level did not show a significant increase in levels of crash risk associated with the presence of drugs. This finding indicates that these other variables (age, gender ethnicity and alcohol use) were highly correlated with drug use and account for much of the increased risk associated with the use of illegal drugs and with THC.

    This analysis shows that the significant increased risk of crash involvement associated with THC and illegal drugs is not found after adjusting for these demographic variables. This finding suggests that these demographic variables may have co-varied with drug use and accounted for most of the increased crash risk. For example, if the THC-positive drivers were predominantly young males, their apparent crash risk may have been related to age and gender rather than use of THC.
    View attachment 43006
    Compton, R. P. & Berning, A. (2015, February). Drug and alcohol
    crash risk. (Traffic Safety Facts Research Note, Report
    No. DOT HS 812 117). Washington, DC: National Highway
    Traffic Safety Administration.


  1. cra$h
    This study seems pretty vague. Statistically younger drivers are at a much higher risk of crashing, and coincidentally it's the same time when you see a higher amount of drug use. And based on the people I've met from hardcore addicts to completely sober people, I've found that a much larger majority of drug using people have crashed their cars compared to those on the opposite spectrum. Not only that but those who use drugs more frequently (especially downers) crash more than the occasional user, and much more than those who are sober. There isn't really anything definitive here, it's even worded that way. But at least it's coming from a reliable source. Although I'm sure a lot of intoxicated crashes specifically in direct relation to illegal drugs go unreported.
  2. Diverboone
    The reason I found this report "shocking" is because of the source. Often there is a "conflict", that's when a major fund or contributor stands to gain from the conclusion, the research is at a greater risk of being biased. National Highway Traffic Safety Administration is who funded this study. I would have expected results that were more consistent with their stance against "drugged driving".

    Starting in 1990 we have seen implementation of drug per se laws in at least 15 States. These laws generally make it an impaired-driving offense to drive with a measurable amount of certain drugs in one’s system. Some States define this as any detectable amount of drug. The findings of this study did not find a statistically noticeable increase in risk associated with drivers who had consumed marijuana. If the results can be reproducible and predictable the laws prosecuting those drivers are founded upon mere suspicion of hypothetical danger. Not a real identifiable harm or threat. Laws that criminalize hypothetical fears are unfounded and are a slippery slop to start down.

    I personally believe certain drugs can increase the risk of accidents. But my opinions are anecdotal and relating to the abuse of those certain drugs, not mere use.
  3. Scloud90
    double posted?
  4. Scloud90
    I havent been in a traffic accident in 7 years. That crash was when I was a young sober male.

    I increasingly started drinking and once blew a .27 (the only time I got arrested)

    I felt more sober than when I had drove before heavily intoxicated. These were hour long driving sessions as well. In fact the cop that pulled me over had followed me all throughout the city till I barely touched the line to pull me over.

    When you develop a high tolerance for drugs and alcohol you can act as if you're sober when youre driving for the most part and can be more careful. Younger people however are not used to this, and like me when I was a kid wasnt very great at driving in icy weather and crashed regardless.

    Im not proud of my drunk driving, but as an alcoholic I did it every day cause I had to drive to work and back, as well as other places. Everytime I was extremely drunk according to the legal limit but I felt absolutely fine.
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