Concerns expressed by lawmakers that marijuana legalization will make the roads more dangerous might not be totally founded, a congressional research body said in a recent report. In fact, the experts tasked by the House and Senate with looking into the issue found that evidence about cannabis’s ability to impair driving is currently inconclusive.
While law enforcement has well-established tools to identify impaired driving from alcohol, developing technology to do the same for cannabis has proved difficult. Not only is the technology lacking, but questions remain as to how THC affects driving skills in the first place and what levels of THC should be considered safe.
“Although laboratory studies have shown that marijuana consumption can affect a person’s response times and motor performance, studies of the impact of marijuana consumption on a driver’s risk of being involved in a crash have produced conflicting results, with some studies finding little or no increased risk of a crash from marijuana usage,” the Congressional Research Service (CRS) wrote.
What’s more, “studies have been unable to consistently correlate levels of marijuana consumption, or THC in a person’s body, and levels of impairment.”
Both advocates and opponents of marijuana reform strongly support finding a resolution to the impaired driving detection issue. But experts aren’t so confident that researchers will be able to develop something akin to an alcohol breathalyzer, as the most promising attempts have only been able to determine whether a person has smoked within recent hours.
What’s striking about the report from Congress’s official research arm is that it repeatedly states it’s not clear that cannabis consumption is associated with an increased risk of traffic accidents. In general, the issue has been treated as something of a given in congressional hearings, with some lawmakers arguing that loosening federal cannabis laws would