A Test for Marijuana Impairment? A UMass Prof Has an App for That

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Massachusetts voters legalized recreational marijuana earlier this month, despite the fact that there’s still no easy way for law enforcement to test someone behind the wheel for marijuana-induced impairment.

A field sobriety test is used when a motorist is suspected of reckless driving, and a breathalyzer is used to gauge the level of alcohol in a driver’s bloodstream. But there’s nothing similar to a breathalyzer for testing whether someone is driving while under the influence of marijuana.

“You have to prosecute the person based on the officer’s observations and what the officer found during the car stop. It makes it very difficult,” said William G. Brooks III, Norwood police chief and president of the Massachusetts Chiefs of Police Association.

That’s why Michael Milburn, a psychology professor at University of Massachusetts Boston for 39 years, is trying to get his app that tests for marijuana impairment into the hands of law enforcement....

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