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Although consuming cannabis is legal in Colorado and several other states, driving while under the influence of the drug is not. Nick Pedersen/Getty Images hide caption

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Nick Pedersen/Getty Images

Scientists Still Seek A Reliable DUI Test For Marijuana

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The BACTrack Vio keychain breathalyzer and app on the iPhone at NPR headquarters in Washington, D.C. A public health researcher says tools like this could help people make better decisions about alcohol use. Meredith Rizzo/NPR hide caption

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Meredith Rizzo/NPR