Loading

driving

  • by Paul Armentano, NORML Deputy Director May 22, 2019

    Drivers testing positive for the presence of THC in blood do not possess a significantly increased risk of being responsible for a non-fatal motor vehicle accident, according to data published in the journal Addiction.

    Investigators from the University of British Columbia compared the likelihood of crash responsibility in drivers testing positive for THC and/or other substances as compared to drug-free drivers over a six-year period (2010 to 2016).

    Researchers reported, “In this multi-site observational study of non-fatally injured drivers, we found no increase in crash risk, after adjustment for age, sex, and use of other impairing substances, in drivers with THC less than 5ng/ml. For drivers with THC greater than 5ngml there may be an increased risk of crash responsibility, but this result was statistically non-significant and further study is required. … Our findings … suggest that the impact of cannabis on road safety is relatively small at present time.”

    By contrast, authors reported, “There was a significantly increased risk for drivers who used alcohol, sedating medications, or recreational drugs others than cannabis.” Drivers who tested positive for the concurrent use of cannabis and alcohol possessed a higher risk of accident as compared to drivers who tested positive for alcohol alone – a finding that is consistent with other studies.

    The abstract of the study, “Cannabis use as a risk factor for causing motor vehicle crashes: A prospective study,” is online here. Additional information is available in the NORML fact-sheet “Marijuana and Psychomotor Performance.”

  • by Paul Armentano, NORML Deputy Director March 21, 2018

    The enactment of adult use marijuana regulation in Colorado and Washington is not independently linked to an increase in traffic fatalities, according to a study published this week by the National Bureau of Economic Research.

    Investigators at the University of Oregon compared traffic accident outcomes in Colorado and Washington following legalization to other states with similar pre-legalization economic and traffic trends. They reported, “We find that states that legalized marijuana have not experienced significantly different rates of marijuana- or alcohol-related traffic fatalities relative to their synthetic controls.”

    Authors concluded, “In summary, the similar trajectory of traffic fatalities in Washington and Colorado relative to their synthetic control counterparts yield little evidence that the total rate of traffic fatalities has increased significantly as a consequence of recreational marijuana legalization.”

    The study’s findings are similar to those of a 2017 study published in The American Journal of Public Health which reported, “Three years after recreational marijuana legalization, changes in motor vehicle crash fatality rates for Washington and Colorado were not statistically different from those in similar states without recreational marijuana legalization.”

    A 2016 study reported that the enactment of medical cannabis legislation is associated with an immediate decline in traffic fatalities among younger drivers.

    Full text of the study, “Early evidence on recreational marijuana legalization and traffic fatalities” is available from the National Bureau of Economic Research. NORML’s fact-sheets on cannabis, psychomotor performance, and accident risk is online here.

  • by Paul Armentano, NORML Deputy Director September 25, 2017

    Marijuana and the LawStandard roadside field sobriety tests (FST) are not reliable indicators of marijuana-induced impairment, according to a ruling by the Massachusetts Supreme Court.

    Justices determined that there is a lack of scientific consensus as to the validity of FSTs for determining whether a subject is under the influence of cannabis. They opined: “There is ongoing disagreement among scientists, however, as to whether the FSTs are indicative of marijuana impairment. In recent years, numerous studies have been conducted in an effort to determine whether a person’s performance on the FST is a reliable indicator of impairment by marijuana. These studies have produced mixed results. … We are not persuaded … that the FSTs can be treated as scientific tests establishing impairment as a result of marijuana consumption.”

    As a result, justices ruled that police may only provide limited testimony with regard to a defendant’s FST performance. An officer “may not suggest … on direct examination that an individual’s performance on an FST established that the individual was under the influence of marijuana,” the court determined. “Likewise, an officer may not testify that a defendant ‘passed’ or ‘failed’ any FST, as this language improperly implies that the FST is a definitive test of marijuana use or impairment.”

    The court further ruled that a police officer may not testify “without being qualified as an expert [as] to the effects of marijuana consumption [or] offer an opinion that a defendant was intoxicated by marijuana [because] no such general knowledge exists as to the physical or mental effects of marijuana consumption, which vary greatly amongst individuals.”

    Attorneys Steven Epstein and Marvin Cable filed an amicus curiae brief in the case on behalf of national NORML.

    The case is Commonwealth v. Gerhardt.

  • by Paul Armentano, NORML Deputy Director June 22, 2017

    thumbs_upThe enactment of statewide laws regulating the adult use and sale of cannabis is not associated with subsequent changes in traffic fatality rates, according to an analysis of traffic safety data (“Crash fatality rates after recreational marijuana legalization in Washington and Colorado”) published today in the American Journal of Public Health.

    Investigators from the University of Texas-Austin evaluated crash fatality rates in Colorado and Washington pre- and post-legalization. They compared these rates to those of eight control states that had not enacted any significant changes in their marijuana laws.

    “We found no significant association between recreational marijuana legalization in Washington and Colorado and subsequent changes in motor vehicle fatality rates in the first three years after recreational marijuana legalization,” author concluded.

    They further reported, “[W]e also found no association between recreational marijuana legalization and total crash rates when analyzing available state-reported nonfatal crash statistics.”

    Commenting on the findings, NORML Deputy Director Paul Armentano said: “These conclusions ought to be reassuring to lawmakers and those in the public who have concerns that regulating adult marijuana use may inadvertently jeopardize public safety. These results indicate that such fears have not come to fruition, and that such concerns ought not to unduly influence legislators or voters in other jurisdictions that are considering legalizing cannabis.”

    A prior study published last year by the same journal reported that the enactment of medical marijuana legalization laws is associated with a reduction in traffic fatalities compared to other states, particularly among younger drivers.

    Fatal accident rates have fallen significantly over the past two decades — during the same time that a majority of US states have legalized marijuana for either medical or social use. In 1996, the US National Highway Traffic Safety Administration reported that there were an estimated 37,500 fatal car crashes on US roadways. This total fell to under 30,000 by 2014.

    A summary of the study appears online under ‘First Look’ on the apha.org website here.

  • by Paul Armentano, NORML Deputy Director December 21, 2016

    cropsThe passage of medical marijuana legalization is associated with reduced traffic fatalities among younger drivers, according to data published online ahead of print in the American Journal of Public Health.

    Investigators from Columbia University in New York and the University of California at Davis analyzed traffic fatality data from the years 1985 to 2014.

    They reported that states with medical cannabis laws had lower overall traffic fatality rates compared to states where cannabis is illegal, and that there was an immediate decline in motor vehicle deaths following the establishment of a legal cannabis market – particularly among those under 44 years of age.

    Authors concluded: “[O]n average, MMLs (medical marijuana laws) states had lower traffic fatality rates than non-MML states. …. MMLs are associated with reductions in traffic fatalities, particularly pronounced among those aged 25 to 44 years. … It is possible that this is related to lower alcohol-impaired driving behavior in MML-states.”

    An abstract of the study, “US traffic fatalities, 1985-2014, and their relationship to medical marijuana laws,” appears online here.

Page 1 of 512345