HMN 2025: How Tests to detect marijuana-impaired driving are primarily based on ‘pseudoscience,’

For years now, U.S. police departments have employed officers who’re skilled to be specialists in detecting “drugged driving.” The downside is, nonetheless, that the strategies these officers use usually are not primarily based on science, in line with a new editorial within the Journal of Studies on Alcohol and Drugs (JSAD).

With marijuana now authorized in lots of U.S. states, the necessity for dependable checks for marijuana impairment is extra urgent than ever. Police can consider alcohol-intoxicated drivers through the use of an goal measure of breath alcohol outcomes. But there isn’t a “breathalyzer” equal for marijuana. The drug is metabolized in another way from alcohol, and an individual’s blood ranges of THC (the principle intoxicating chemical in marijuana) don’t correlate with impairment.

So regulation enforcement depends on subjective techniques—roadside checks and extra evaluations by police officers specifically skilled to be so-called drug recognition specialists (DREs). These officers observe a standardized protocol that’s stated to detect drug impairment and is claimed to even decide the precise drug kind, together with marijuana.

The course of entails quite a few steps, together with checks of bodily coordination; checking the driving force’s blood strain and pulse; squeezing the driving force’s limbs to find out if the muscle tone is “regular” or not; and analyzing pupil measurement and eye actions.

But whereas the protocol has the trimmings of a scientific strategy, it isn’t truly primarily based on proof that it really works, stated perspective writer William J. McNichol, J.D., an adjunct professor at Rutgers University Camden School of Law.

Instead, McNichol stated, the DRE course of is a product of “police science”—methods created by law enforcement officials to make use of of their work. Few scientific research have tried to find out how usually DREs get it proper. But the present proof suggests they’re “not a lot better than a coin toss,” McNichol stated.

Despite that, DRE packages and coaching are federally funded, and greater than 8,000 DREs work in police departments nationwide, in line with the International Association of Chiefs of Police. In addition, McNichol factors out, a “spinoff” of the DRE has just lately made its manner into job websites: office impairment recognition specialists, or WIREs, who’re licensed to detect and stop on-the-job drug impairment.

Not way back, when marijuana was uniformly unlawful within the U.S., folks would land in scorching water for easy possession or use of the drug. Now that it is authorized in lots of states, McNichol stated, there’s an pressing want for scientifically legitimate, dependable strategies for detecting marijuana impairment. That, he added, would require scientists within the substance abuse discipline to become involved.

A related commentary revealed in the identical subject of JSAD echoes that final sentiment. Collaborations between regulation enforcement and scientists who usually are not invested in both supporting or refuting the established order is the very best path ahead, write Thomas D. Marcotte, Ph.D., and Robert L. Fitzgerald, Ph.D., from the Center for Medicinal Cannabis Research on the University of California San Diego.

“Developing extra strong instruments to determine cannabis-impaired drivers in an unbiased trend is important to preserving our roadways protected,” they write. These authors additionally present suggestions for enhancing the detection of drug-impaired driving.

As for tips on how to fund that kind of analysis, McNichol stated a supply already exists: taxes from authorized marijuana gross sales.

“The cash is there,” he stated, “if solely it may be allotted correctly.”