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Massachusetts Supreme Court Rules Roadside Drunk Driving Tests Not Valid for Marijuana

The Massachusetts Supreme Judicial Court ruled today that field sobriety tests used to determine if someone is drunk cannot be legally used as conclusive evidence that a motorist is under the influence of marijuana.

Cannabis Becomes Legal TonightAccording to the Associated Press, the Supreme Judicial Court said it was reasonable for police officers to testify — as non-expert witnesses — only to their observations about how individuals performed during sobriety tests. However, the court ruled that officers are not allowed to tell juries if defendants passed or failed such tests, nor offer their own opinions on whether a driver was too high to be behind the wheel.  The ruling came in a case of Thomas Gerhardt, who was charged with impaired driving in 2013.

The court noted there currently is no reliable scientific test for marijuana impairment comparable to tests for blood alcohol content. In drunken-driving cases, results of field sobriety tests can be correlated with blood alcohol readings as evidence of impairment. The lack of such a test for marijuana has taken on greater significance in states such as Massachusetts that have legalized the recreational use of marijuana for adults, but where driving under the influence of cannabis remains a serious crime.

“While not all researchers agree, a significant amount of research has shown that consumption of marijuana can impair the ability to drive,” the court said in a unanimous decision. “There is ongoing disagreement among scientists, however, as to whether (field sobriety tests) are indicative of marijuana impairment.”

In the case, Thomas Gerhardt challenged the admissibility of tests that were conducted by a state trooper in Millbury after he was pulled over on suspicion of impaired driving. The trooper reported smoke in the car, the odor of marijuana and found two roaches. Two passengers said they had smoked the joints about 20 minutes earlier, while Gerhardt maintained it had been about three hours since he used marijuana.

During his field sobriety test, Gerhardt was able to recite a portion of the alphabet and count backward, but was unable to properly follow instructions for a so-called walk-and-turn test, leading the officer to conclude he was under the influence of marijuana.

The state Legislature recently ordered creation of a special commission to study issues around driving while impaired by marijuana.

About Anthony Martinelli

Anthony, co-founder and Editor-in-Chief of TheJointBlog, has worked closely with numerous elected officials who support cannabis law reform, including as the former Campaign Manager for Washington State Representative Dave Upthegrove. He has also been published by multiple media outlets, including the Seattle Times. He can be reached at TheJointBlog@TheJointBlog.com.

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