Weed and driving: CBD-rich cannabis has 'no significant impact' on driving, forensic study finds

A new study found "no significant impact" on driving ability after smoking CBD-rich marijuana and no effect on vital signs, even though all participants in study had exceeded the legal limit of THC in their blood, Marijuana Moment first reported.

In Switzerland, 33 participants each received a joint containing tobacco and either CBD-rich marijuana or a placebo. The researchers then performed several common DUI tests.

According to researchers from the Institute of Forensic Medicine at the University of Bern, the aim of the study was "to inform warning recommendations on tobacco substitute products containing CBD-rich marijuana and to provide information for drivers regarding the possible risks of consuming CBD-rich marijuana.”

No signs of tampering were observed

The driver assessment consisted of three different tests, including a reaction test, a determination assessment to measure the ability to react under complex stimulus conditions, and a Cognitrone test, where the participant compares geometric Figures. According to the study, the tests used in the study are regularly used in Switzerland by medical personnel to determine neurological deficits. Tests included standing with arms outstretched and eyes closed while following instructions, a finger-to-nose test, and a "walk and turn" test.

The study found "no significant difference in the comparison between CBD and placebo consumption, between male and female participants, or between the first and second trial". There were no significant differences in reaction time or motor skill time between smoking CBD-rich marijuana and a placebo on reaction time as well as stress behavior or concentration performance.

"Although free THC concentrations reached levels considered to cause impairment symptoms in other studies in which high-THC marijuana was smoked, there were no signs of impairment was observed in the current study,” according to the study.

Researchers have recommended that consumers refrain from driving for several hours after smoking CBD-rich marijuana, as legal THC concentration limits may be exceeded.

Original publication: December 17, 2021

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