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Not finding something doesn’t mean it doesn’t exist

07.06.20

A favorite citation used by the marijuana lobby to promote the idea that marijuana doesn’t impair driving is one published in 2015 by the National Highway Traffic Safety Administration (www.nhtsa.gov/behavioral-research/drug-and-alcohol-crash-risk-study).  And when the study is cited, the results are usually badly misquoted. 

 

Los Angeles Times: “Good news (?): marijuana doesn’t increase the likelihood of car crashes.”

USA Today: “New study shows no link between marijuana use and car accidents.”

Reason: “Landmark study finds marijuana … READ MORE

Deceptive statistical analysis

07.06.20

Two articles on the effect of recreational marijuana commercialization on traffic fatalities reached opposite conclusions in the June 22nd 2020 issue of JAMA Internal Medicine.  Readers should understand the effect of study design differences before concluding that marijuana can be commercialized without an increase in traffic fatalities.

Kamer (doi:10.1001/jamainternmed.2020.1769) reported that traffic fatalities increased in both Colorado and Washington after commercializing recreational marijuana.  But Santaella-Tenorio (doi:10.1001/jamainternmed.2020.1757) found traffic fatality increased in Colorado but not in … READ MORE

Another badly flawed study

06.18.19

Jeff Brubacher from Vancouver General Hospital published “Cannabis use as a risk factor for causing motor vehicle crashes: a prospective study.”  The study has earned a great deal of press due to his finding that there was no increased risk of crash responsibility in the driver pool he studied for drivers with a blood THC level between 2 and 5 ng/ml.  There was an increased risk of crash responsibility for drivers over 5 ng/ml, but … READ MORE

Twelve Drugged-Driving Lessons from Colorado

09.17.18

What has marijuana legalization done to Driving Under the Influence (DUI) cases in Colorado? Important answers are now emerging.  July 2018, the  Division of Criminal Justice (DCJ) released a 106-page report Driving Under the Influence of Drugs and Alcohol for the year 2016.  This first-of-its-kind report and its database enabled us to draw twelve important conclusions.

 

 

1          Colorado’s report is the first to show causes of DUI, not just presence of drugs

Coroners … READ MORE

More bad journalism

03.24.16

imagesJacob Sullum, a pro-pot writer for Reason and Fortune magazines, is at it again.

This time, he claims that marijuana’s impact on crash risk has been greatly exaggerated, based upon Rogeberg and Elvik’s (R&E) paper, soon to be published in the journal Addiction. Sullum, in his typical snarky style, writes that there’s not much evidence of a surge in traffic fatalities due to marijuana-impairment in Colorado or Washington. This shouldn’t be a surprise, … READ MORE

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