Commission: Michigan should not set THC limit for motorists

The Impaired Driving Safety Commission recently forwarded its findings to Gov. Gretchen Whitmer and the Legislature after spending nearly two years studying how marijuana affects drivers.

The Lansing State Journal reports the panel recommended that Michigan set no limit for the amount of marijuana’s active ingredient is in a motorist’s blood.

The commission’s report says levels of tetrahydrocannabinol, or THC, in a person’s blood are not a “reliable indicator” of whether they’re impaired.

The panel instead recommended that the state continue to use roadside sobriety tests to determine if a driver is impaired.

Michigan approved medical marijuana use in 2008, and recreational marijuana use last year.


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  • Helpful Info

    This makes sense because cannabis doesn’t interfere with motor skills in those that have a tolerance to its effects. Someone that uses medical marijuana every day can drive the same as someone who has never used cannabis. The people that experience difficulty with driving and other tasks are those that don’t have any kind of tolerance to THC.

  • We the people

    I think they should, it’s just like alcohol some people have a tolerance to it and some dont, how many headlines have we heard lately that states a fatal accidents was caused by impaired driving from marijuana

    • Freeman

      After 2 years of study by a state funded organization they find that thc levels in the blood “are not a reliable indicator of impaired driving”, but you think that it should still be used?
      You like your shackles extra tight don’t you?

  • steve

    Without some definite tests and absolute measurements, there are going to be a lot of cases that will wind up in court. “The cop said I acted impaired, but I know I wasn’t. Show me proof that I was”. The lawyers are going to have a field day every day when subjective judgement takes the place of objective measurement.

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