#THC

It’s always nice to get a break from the endless stream of industry marketing materials about electrification, though this week’s impromptu theme still involves going green. Following news that General Motors is considering changing its drug testing policies to exclude marijuana, there has been heavy coverage of an Insurance Institute for Highway Safety (IIHS) study claiming states that have legalized recreational use of cannabis are seeing more crashes.

But the framing seems wildly irresponsible as it fails to highlight the problem being heavily tied to individuals operating a vehicle under the influence of marijuana and alcohol combined. It’s more or less what the IIHS attempted to do in 2018 with help from the Highway Loss Data Institute (HLDI). Our guess is that the duo is seeking out fresh reasons for insurance companies to raise rates in regions that have legalized pot because even their own research complicates the issue.

Impairment tests used by authorities in U.S. states where marijuana use is legal in some form have no basis in science, and their results essentially mean nothing, a recent study concludes.

Commissioned by the American Automobile Association’s safety foundation, the study found that no blood test for THC, the active ingredient in marijuana, can accurately determine a driver’s level of impairment, the Associated Press reports.

The finding blows law enforcement’s main method of convicting high drivers into the weeds.