And who is making that determination? The person who is high on marijuana??
https://www.nida.nih.gov/Marijbroch/Marijteenstxt.html
OK, I haven't read the other studies that have been posted in this thread, but this NIH website is one of the first that popped up for me when I did some searching just now.
GVC has done an awesome job in this thread, but this one was burning at me. I just had to respond.
First off, that site is obviously biased and very anti marijuana. I think you already know that, but just in case.
Before I go into how ridiculous this is, let me give a little info.
First, the legal blood alcohol limit in Utah is .08%. Some states have .10% limits. No state has lower than Utah's .08%. You can view the limits for each state here:
https://www.ohsinc.com/drunk_driving_laws_blood_breath _alcohol_limits_CHART.htm
Now lets understand what the legal BAC limit is designed to do. It is not put in place because they feel at .08% you are sloppy drunk and unable to drive. It is put in place because they want you to either stop drinking or let someone else drive
before you get to the point where you are a danger to anyone. So they know most people aren't drunk to the point they can't drive at .08%, they just don't want anyone to actually hit that point while continuing to drive. It's understandable. If I'm sloppy drunk at .08%, then I must also be pretty drunk at (legal to drive) .07%. So they make the legal limit low enough that if you ever do get pretty drunk, you'll be well over the legal limit and should not have been driving.
In short, .08% is not drunk at all for most people. I am not saying I agree or disagree with this limit, just trying to put it into perspective what it actually means. I know you probably have never been drunk in your life, so you probably have no concept of what .08% actually is. In the real world, it's maybe slightly buzzed for someone with a low tolerance, and even less buzzed for someone with a high tolerance. Probably fine to drive in both cases, but the line had to be drawn somewhere and this is where it is drawn legally in Utah. And again, I am not complaining about it so lets not start a discussion about that, I only wanted to put into perspective what .08% BAC actually is in practice for those who have only seen it written and never felt it.
So, now, on to marijuana...
I don't smoke weed anymore. I quit back when I started having kids. But I do know a bunch of old hippies who have been smoking everyday for 50+ years. These people have as great of a tolerance as you can probably get. And these people never smoke a whole marijuana cigarette (I'll refer to it as a joint going forward) by themselves. Most of the time they just load up a pipe (which I'll call a bowl going forward) and take a few hits, saving the rest for later. In the event a joint is rolled, same thing, they take a few hits and save the rest for later. They will smoke a whole joint if there are several of them all sharing it. But even then, a lot of times 3 or 4 of them will only smoke part of a joint and save the rest for later.
So when I read your link and I see a statement like this:
"Data have also shown that while smoking marijuana, people show the same lack of coordination on standard "drunk driver" tests as do people who have had too much to drink (8)."
I click on the "8" that they use as the source for their info, and I see it is
"Liguori, A.; Gatto, C. P.; and Robinson, J. H. Effects of marijuana on equilibrium. psychomotor performance, and simulated driving. Behavioral Pharmacology, 9:599-609, 1998."
So after searching the net for that particular study, I can't find it. GVC was apparently able to locate some info on it, and it said (per GVC's post) the effect of smoking one whole marijuana cigarette (3.96% THC) on brake latency and equilibrium is equal to that of someone with a BAC of .05 driving at the same speed.
So, lets put that into perspective. In a nutshell, it is saying that someone who smokes way more weed than most weed smokers would consider normal, would still drive like someone who is way under the legal limit of even the strictest DUI laws. And this is for people travelling at the same speed. Studies (posted earlier in this thread) have shown that weed smokers tend to slow down when driving, which makes it even safer.
So how does that prove that smoking weed makes driving dangerous? From what I can tell, they are saying that it is actually pretty safe. But they are somehow trying to spin that into marijuana being dangerous because they are a biased site.