Most studies find that marijuana use doesn't actually significantly impair driving ability. The increased risk is somewhere between 1.0 - 1.3x
Uh that meta-analysis of 9 studies you posted disagrees:
Specifically, drivers who test positive for marijuana or self-report using marijuana are more than twice as likely as other drivers to be involved in motor vehicle crashes. The increased risk of crash involvement associated with marijuana use is generally consistent across studies that were conducted in different geographic regions and driver populations, used different research design approaches, and were based on different methods for measuring marijuana use.
Further, one of those studies showed a 3.3x increase in crashes for high levels of THC-COOH in urine.
And as anyone who has been sufficiently stoned will tell you, there is no way in hell you should let them behind a wheel (or frankly, anyone who is mentally incapacitated). There is an upper limit just as there is for any number of prescription drugs that affect mental performance.
"Further, one of those studies showed a 3.3x increase in crashes for high levels of THC-COOH in urine."
That is the equivalent of something like half a beer, maybe one full beer at the most. And even the authors say that this is probably an overestimate, and most likely a substantial one.
If you look at the actual double blind studies, many of them can't even tell the placebo arm from the trial arm in terms of total accident risk.
Comments
Most studies find that marijuana use doesn't actually significantly impair driving ability. The increased risk is somewhere between 1.0 - 1.3x
Uh that meta-analysis of 9 studies you posted disagrees:
Specifically, drivers who test positive for marijuana or self-report using marijuana are more than twice as likely as other drivers to be involved in motor vehicle crashes. The increased risk of crash involvement associated with marijuana use is generally consistent across studies that were conducted in different geographic regions and driver populations, used different research design approaches, and were based on different methods for measuring marijuana use.
Further, one of those studies showed a 3.3x increase in crashes for high levels of THC-COOH in urine.
And as anyone who has been sufficiently stoned will tell you, there is no way in hell you should let them behind a wheel (or frankly, anyone who is mentally incapacitated). There is an upper limit just as there is for any number of prescription drugs that affect mental performance.
"Further, one of those studies showed a 3.3x increase in crashes for high levels of THC-COOH in urine."
That is the equivalent of something like half a beer, maybe one full beer at the most. And even the authors say that this is probably an overestimate, and most likely a substantial one.
If you look at the actual double blind studies, many of them can't even tell the placebo arm from the trial arm in terms of total accident risk.