PHOENIX - An Arizona court ruling says motorists can continue to be prosecuted for driving under the influence of marijuana even if the only proof is a blood test that shows a chemical compound that doesn't cause impairment but that can remain in blood for a month.
The Court of Appeals ruling overturns a lower court judge who said it didn't make sense to permit people to be prosecuted despite no evidence they're under the influence.
Read more: Arizona ruling upholds DUI test for marijuana
