Does Utah's metabolite DUI statute require proof of impairment? State v. Outzen Explained

The Utah Supreme Court in State v. Outzen definitively answered whether Utah Code section 41-6a-517 requires proof of impairment for a conviction based on driving with controlled substance metabolites in one’s system. The court’s unanimous decision has significant implications for metabolite DUI prosecutions throughout Utah.

Background and Facts

Outzen fell asleep while driving and rear-ended another vehicle hours after smoking marijuana. Highway Patrol troopers detected signs of recent marijuana use but found no contraband. Significantly, field sobriety tests indicated Outzen “was not too impaired to drive.” However, blood tests revealed the primary metabolite of marijuana in his system. He was charged under Utah Code section 41-6a-517, which prohibits operating a motor vehicle with “any measurable controlled substance or metabolite of a controlled substance” in one’s body.

Key Legal Issues

Outzen challenged his conviction on three grounds: (1) the statute’s plain language requires proof of impairment, (2) the statute violates the Eighth and Fourteenth Amendments as a status offense under Robinson v. California, and (3) it violates Utah’s uniform operation of laws provision by creating unconstitutional classifications.

Court’s Analysis and Holding

The court rejected all challenges. Regarding statutory interpretation, the court emphasized that the statute criminalizes driving with “any measurable” controlled substance or metabolite, and limiting this to impairing substances would conflict with the legislature’s use of “any.” The phrase “in cases not amounting to” a DUI violation distinguishes the metabolite statute from the DUI statute but does not incorporate an impairment requirement.

On constitutional grounds, the court distinguished Robinson v. California, finding that section 41-6a-517 criminalizes the act of driving with metabolites present, not the status of having used drugs. Finally, the court applied rational basis review to the uniform operation challenge, concluding the statute reasonably serves legitimate purposes of deterring illegal drug use and protecting public safety.

Practice Implications

This decision establishes that Utah’s metabolite DUI statute requires no proof of impairment whatsoever. Practitioners should focus constitutional challenges on narrow factual distinctions rather than broad facial challenges, as the court has firmly rejected arguments that the statute requires impairment or creates impermissible status offenses.