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Igor Grant

FILE - 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. Six states that allow marijuana use have legal tests for driving while impaired by the drug that have no scientific basis, according to a study by the nation’s largest automobile club that calls for scrapping those laws. ( AP Photo/Jose Luis Magana, File) (AP)

Legalizing marijuana will mean taking measures to make sure users aren’t too doped up to drive

Igor Grant
(Reuters/Jason Redmond)

With legal pot comes a problem: How do we weed out impaired drivers?

Igor Grant