Michigan Commission: THC Level Not a ‘Reliable Indicator’ of Driving Impairment

April 2, 2019

A state commission says Michigan should not set a legal limit for how much of marijuana’s active ingredient motorists can have in their system.

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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