Does Marijuana Impair Driving?

It has always been supposed that cannabis, such as alcohol, impairs the understanding, coordination, reflexes and judgment required for the secure operation of a motor vehicle. And, naturally, there were political studies addressing the issue: Does marijuana hamper driving?

Interestingly, but the findings don't necessarily encourage popular opinion...
On the 1 hand, the California Department of Justice has found that bud definitely impairs psychomotor skills which are functionally associated with driving and driving abilities could be impaired, especially at high-dose amounts or one of inexperienced users.
Contradicting these conclusions, but are just two national studies. The U.S. Department of Transportation conducted study using a completely interactive simulator about the consequences of marijuana and alcohol, independently and in combination, on driver-controlled behaviour and functionality. Although alcohol has been discovered consistently and to induce disability, marijuana had an occasional impact. Injuries and speeding tickets faithfully increased with alcohol, however, no bud or joint alcohol-marijuana influence was noticed. "The Effects of Alcohol on Driver-Controlled Behavior at a Driving Simulator, Stage I", DOT-HS-806-414.
A more recent report entitled"Marijuana and Actual Performance", DOT-HS-808-078, noted that"THC isn't a profoundly impairing drug....It seemingly affects controlled data processing in an assortment of laboratory tests, but not to the extent that is beyond the person's capacity to control when he's prompted and allowed to do so in forcing".
The analysis concluded that:". . .An important practical purpose of this analysis was to ascertain whether rates of driving impairment may be really predicted from measured concentration of THC in plasma or operation measured in possible roadside"sobriety" tests of monitoring hand or ability and posture equilibrium. The outcomes, such as many reported earlier, suggested that none of those measures correctly predicts changes in real performance under the effect of THC...".
The investigators discovered that it"seems impossible to conclude anything regarding a driver's disability on the grounds of their plasma levels of THC and THC-COOH decided in one sample". THC is quite rapidly converted by the body to sterile metabolites, which may remain in the body for hours or even days. It's these metabolites that authorities blood tests from DUI arrests discover and quantify.
To put it differently, (1) marijuna might not impair driving ability in any way, and (2) the bloodstream"signs" only steps an inactive substance that might have been around for days.
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