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No Easy Way To Measure How Much Marijuana Impairs Drivers06:23
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A new study out Tuesday from the AAA Foundation for Traffic Safety finds that it is very hard to accurately measure through a blood test whether someone's driving is impaired because of marijuana. (SAUL LOEB/AFP/Getty Images)
A new study out Tuesday from the AAA Foundation for Traffic Safety finds that it is very hard to accurately measure through a blood test whether someone's driving is impaired because of marijuana. (SAUL LOEB/AFP/Getty Images)

A new study out Tuesday from the AAA Foundation for Traffic Safety finds that it is very hard to accurately measure through a blood test whether someone's driving is impaired because of marijuana.

Another AAA study found that the number of fatal crashes involving a driver who had recently used marijuana doubled in Washington state in the year after recreational marijuana was legalized there. Here & Now's Jeremy Hobson talks to Jake Nelson, the AAA director of traffic safety advocacy and research about both studies.

Guest

  • Jake Nelson, AAA director of traffic safety advocacy and research.

This segment aired on May 10, 2016.

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