A state lawmaker has introduced a bill that would set a legal limit for THC allowed in a driver's blood stream.
Representative Pamela Hornberger introduced a bill that would amend the Michigan's Motor Vehicle Code and make it illegal to drive with THC levels above five nanograms per milliliter of blood.
Seven states across the country currently have regulations that limit THC levels for drivers.
Laws across the state range from one to five nanograms per milliliter.
Dr. Norbert Kaminski, professor of pharmacology and toxicology at Michigan State, says THC levels can vary depending on how regularly you use it or how it was ingested.
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