On November 20, 2015, the Supreme Court of Arizona decided Dobson v. McClennen (P.3d, 2015 WL 7353847, Arizona Supreme Court 2015). The decision has important implications for individuals that use medical marijuana and might have THC or its metabolite in their system but drive at a time when they are not impaired. Jokingly called the “Driving While a Habitual User of Marijuana,” these prosecutions are no joke.
Although the responsible use of cannabis for medical purposes has largely been decriminalized in Arizona, prior to this decision the DUI laws effectively made it a crime to drive as a medical marijuana patient (even after the impairing effects faded and disappeared). In other words, using medical marijuana should not automatically be a DUI when there was no actual impairment at the time of driving.
The decision in Dobson v. McClennen didn’t make either side happy. The defense wanted a ruling that Medical Marijuana Patients were immune from the “per se” version of DUI under § 28–1381(A)(3). On the other hand, the prosecution wanted a ruling that a positive blood test meant an automatic “per se” DUI conviction under § 28–1381(A)(3). The Court rejected both positions and came up with a middle ground that leaves many of the complicated issues surrounding driving after consuming medical marijuana unresolved.