PHOENIX—An appeals court has issued a ruling that upholds the right of authorities to prosecute pot smokers in Arizona for driving under the influence even when there is no evidence that they are actually high.
The ruling by the Court of Appeals focuses on the chemical compounds in marijuana that show up in blood and urine tests after people smoke pot. One chemical compound causes drivers to be impaired; another is a chemical that stays in people's systems for weeks after they've smoked marijuana but doesn't affect impairment.
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