In this April 2, 2016 file photo, a demonstrator waves a flag with marijuana leaves on it during a protest calling for the legalization of marijuana, outside of the White House in Washington. ( AP Photo/Jose Luis Magana, File)
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Motorists are being convicted of driving under the influence of marijuana based on arbitrary state standards that have no connection to whether the driver was actually impaired, says a study by the U.S.'s largest auto club.Currently, six states where medical or recreational marijuana use is legal – Colorado, Montana, Nevada, Ohio, Pennsylvania and Washington – have set specific limits for THC, the chemical in marijuana that makes people high, in drivers' blood. But the study by AAA's safety foundation says the limits have no scientific basis and can result in innocent drivers being convicted, and guilty drivers being released.Another nine states, including some that have legalized marijuana for medical use, have zero-tolerance laws for driving and marijuana that make not only any presence of THC in a driver's blood illegal, but also the presence of its metabolites, which can linger in a driver's bloodstream for weeks after any impairment has dissipated.In addition, frequent marijuana users can exhibit persistent levels of the drug long after use, while THC levels can decline more rapidly among occasional users.
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