Keith Humphreys—a professor of psychiatry at Stanford University who served as a drug policy advisor in the Bush and Obama White Houses—says Fentanyl really is a hugely destructive and disruptive force. He talks with Mike about how the rise of this drug is effected by, and might effect, the trend of marijuana legalization. Plus, Pete Buttigieg and the air-born toxic event. And on Valentine's Day: to swoon or repugn?

Produced by Joel Patterson and Corey Wara

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