COLUMBUS – The Ohio Senate unanimously passed legislation to overhaul the way that prosecutors must prove whether a person was driving under the influence of marijuana.

Ohio, like most the rest of the nation, has liberalized its marijuana laws over the past decade, now allowing recreational and medical use of the drug in a variety of forms, Signal reports.

This has posed a tricky challenge of setting a legal standard that prohibits driving while under the influence of marijuana, while not ensnaring people who are sober on the road but have used the drug in the past few days.

And unlike with alcohol’s well established limit of .08 of blood alcohol content as the legal threshold for impaired driving, the science around cannabis concentration in the blood is far murkier. Some people with

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