Live data from Hacker News

Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

facs.org

21–30 of 523 posts

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#21

I am curious what percentge of the general populous test positive for THC. It would give better context to a dead drivers testing positive for THC.

> It would give better context to a dead drivers testing positive for THC. No it wouldn't. People make those excuses because it's weed, but you would have never posted that on an article about alcohol.

Wasn't so much looking for an excuse, so much as more information.

Why did you automatically assume the point of bias?

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#22

I am curious what percentge of the general populous test positive for THC. It would give better context to a dead drivers testing positive for THC.

> It would give better context to a dead drivers testing positive for THC. No it wouldn't. People make those excuses because it's weed, but you would have never posted that on an article about alcohol.

No need to be judgmental about statistics. They are just facts.

A similar result about alcohol would be the (hypothetical) statement that the rate of drunk drivers in fatal accidents was constant before and after the enactment of Prohibition.

I do agree that the fact that fatal THC% stays constant before and after legalization is a surprise.

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#23
post #8

Is there a full study somewhere? I'd expect them to screen for other psychoactive substances as well, of which I see no mention here.

No, only conference abstract available.

https://journals.lww.com/journalacs/fulltext/2025/11001/trau...

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#24

I am curious what percentge of the general populous test positive for THC. It would give better context to a dead drivers testing positive for THC.

> It would give better context to a dead drivers testing positive for THC. No it wouldn't. People make those excuses because it's weed, but you would have never posted that on an article about alcohol.

It absolutely would. If 40% of people test positive for THC, then this would mean there is no effect. I find it unlikely 40% of people test positive for THC, but yes, it does matter.

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#25

Based on the headline, I was guessing it was any amount of positivity, and may be close to the population level, but it's actually impairment levels of THC: > In a review of 246 deceased drivers, 41.9% tested positive for active THC in their blood, with an average level of 30.7 ng/mL — far exceeding most state impairment limits. Since COVID in CA, it feels like driving has become far more dangerous with much more law…

reading the paper, I’d say this is a case of hoofbeats meaning horses- people are just getting high and crashing.. Although, this seems like a case where the average is very vulnerable to a ‘spiders georg’ type distortion, especially because of the tolerances people build.

Wow, this is amazing, you managed to read a paper that is not published? Impressive!

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#26
post #6

Feels like a low sample size, but I'm not statistician or doctor. That said, almost everyone I know that consumes THC has no qualms driving while doing it, and many of them also at work. It's a huge peeve of mine.

Wow, pretty much no one I know drives under any influence regardless what they use.

I wonder how many of these people were under the influence of alcohol and other substances.

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#27

I am curious what percentge of the general populous test positive for THC. It would give better context to a dead drivers testing positive for THC.

> “An average level of 30.7 ng/mL generally means those people must have consumed marijuana at some time close to driving. This isn’t about residual use; it’s about recent consumption.” If we are at 40% of the population being high at any given moment I think we are having extremely serious societal problems around mental health. Occasional use is not a big deal IMHO, but if a person is spending 40% of waking hours i…

This reading doesn’t make sense. There’s no way to extrapolate from this to any statement about 40% of the population, and even 40% of the day is a serious misread imo.

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#28
post #13

An issue with having the legal limit at ~2-5ng/ml is that it makes habitual users be over the limit if they have smoked recently or not.[0] Making the prohibition seem unserious to some, not about safety but about punitive control, and in turn making it matter less if you smoke and drive as you are taking the risk of getting into trouble in any case. The impairments of driving under the influence of alcohol have been…

Opening the article would have allowed you to see that the average was 30.7 ng/mL, it's in the very first bullet point!

Re: Over 40% of deceased drivers in vehicle crashes test positive for THC: Study

#29
Just noting there’s a difference between THC in your system and THC in your blood. THC leaves the bloodstream after your high. Goes into fat cells and other areas to be broken down and processed (up to a month) later. Having it in the bloodstream after an accident means they were intoxicated at the time according to science. Whether their CB1 receptors were letting it through is another matter. I can smoke a lot of weed and not “feel high” yet I would test off the charts on this test.

For drunk drivers it’s rather easy to assess whether someone is impaired. With marijuana it’s not. So until we have a valid method of testing if someone is “too stoned to drive” we have to push back on any attempt to classify marijuana users as ineligible to drive.

Post reply on HN