Workplace drug testing for marijuana may need updating in light of changing laws, a case before the Colorado Supreme Court suggests. Kai-Huei Yau/MCT/Landov hide caption

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Colorado Case Puts Workplace Drug Policies To The Test

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Does she really think you're funny, or is she just being polite? Jon Feingersh/Getty/Getty Images/Blend Images RM hide caption

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Researcher Greg Bryant Speaks To NPR's Robert Siegel

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