A new study conducted at the University of Iowa’s National Advanced Driving Simulator (NADS) has found drivers who use alcohol and marijuana together weave more on a virtual roadway than drivers who use either substance independently. The study, which was published in Drug and Alcohol Dependence on June 23, was co-authored by Gary Milavetz, associate professor and head of the division of Applied Clinical Sciences, and Andrew Spurgin, postdoctoral research fellow.

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