The court is going to issue an opinion on a case involving Hrach Shilgevorkyan, who was charged in December 2010 with driving with drugs in his system.

The Arizona Supreme Court heard oral arguments today on whether the Legislature intended to keep the roads free from unimpaired people who have metabolites of illegal drugs in their system.

Motorists in Arizona 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 can remain in the blood for a month, a state appellate court has ruled.