An interesting debate has been studied scientifically, and the results have been published by NORML.
Click here to read the entire study's conclusions.
Policy debates regarding marijuana law reform invariably raise the question: "How does society address concerns regarding pot use and driving?" The subject is worthy of serious discussion. NORML’s Board of Directors addressed this issue by ratifying a “no driving” clause to the organization’s “Principles of Responsible Cannabis Use” stating, “Although cannabis is said by most experts to be safer with motorists than alcohol and many prescription drugs, responsible cannabis consumers never operate motor vehicles in an impaired condition.”
Nevertheless, questions remain regarding the degree to which smoking cannabis impairs actual driving performance. Unlike alcohol, which is known to increase drivers’ risk-taking behavior and is a primary contributor in on-road accidents, marijuana’s impact on psychomotor skills is subtle and its real-world impact in automobile crashes is conflicting.
Drugged Driving: True Threat Or False Panic?
Survey data indicates that approximately 112 million Americans (46 percent of the US population) have experimented with the use of illicit substances.2 Of these, more than 20 million (8.3 percent of the population) self-identify as “current” or “monthly” users of illicit drugs,3 and more than 10 million Americans say that they’ve operated a motor vehicle while under the influence of an illicit substance in the past year.4 These totals, while far from negligible, suggest that the prevalence of illicit drug use among US drivers is far less than the prevalence of alcohol among this same population.5
To date, “[The] role of drugs as a causal factor in traffic crashes involving drug-positive drivers is still not well understood.”6 While some studies have indicated that illicit drug use is associated with an increased risk of accident, a relationship has not been established regarding the use of psychoactive substances and crash severity.7 Drivers under the influence of illicit drugs do experience an enhanced fatality risk compared to sober drivers. However, this risk is approximately three times lower than the fatality risk associated with drivers who operate a vehicle above or near the legal limit for alcohol intoxication.8 According to one recent review: “The risk of all drug-positive drivers compared to drug-free drivers is similar to drivers with a blood alcohol concentration of 0.05%. The risk is also similar to drivers above age 60 compared to younger drivers [around age 35].”9
Marijuana is the most common illicit substance consumed by motorists who report driving after drug use.10 Epidemiological research also indicates that cannabis is the most prevalent illicit drug detected in fatally injured drivers and motor vehicle crash victims.11 Reasons for this are twofold. One, pot is by far the most widely used illicit drug among the US population, with nearly one out of two Americans admitting having tried it.12 Two, marijuana is the most readily detectable illicit drug in toxicological tests. Marijuana’s primary psychoactive compound, THC, may be detected in blood for several hours, and in some extreme cases days after past use,13 long after any impairing effects have worn off. In addition, non-psychoactive byproducts of cannabis, known as metabolites, may be detected in the urine of regular users for days or weeks after past use.14 (Other common drugs of abuse, such as cocaine or methamphetamine, do not possess such long half-lives.) Therefore, pot’s prevalence in toxicological evaluations of US drivers does not necessarily indicate that it is a frequent or significant causal factor in auto accidents. Rather, its prevalence affirms that cannabis remains far more popular and is far more easily detectable on drug screening tests than other controlled substances.
Click here to read the entire study's conclusions.