Washington was one of the first states to legalize marijuana for personal use. And you can bet people in Oregon counties bordering Washington crossed that border to buy pot.
And then Oregon passed its own personal use law, and the cross-border traffic cooled.
A study led by University of Oregon health economist Ben Hansen finds that much of the marijuana grown in Washington stays in Washington, counter to concerns that much of it is exported to the black market.
He shares the results of his research with us in this month's installment of "cUriOus: Where Research Meets Radio," a collaboration with the U of O.