Like 'flipping a coin': Why it's so hard to test drivers for pot

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https://i.cbc.ca/1.4503991.1516912045!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/weed-close-up-jpg.jpg The federal government plans to invest $81 million to train police officers to smoke out drivers impaired by pot across Canada while using a test experts say is flawed and that is being challenged in a U.S court.


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