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flag States are developing tools to detect marijuana-impaired driving as legalization spreads.

flag States across the U.S. are working to develop reliable tools to detect marijuana-impaired driving as its legalization and use increase. flag While every state prohibits drug-impaired driving, marijuana's effects are hard to measure due to varying tolerance levels and the long-lasting presence of THC in the system. flag Researchers and state governments are testing saliva tests, cognitive apps, and goggles to detect recent impairment, with the goal of creating an accurate method similar to alcohol breathalyzers.

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