A new report from the Manhattan Institute supports what law enforcement and drug policy experts have long understood: the majority of fentanyl entering the U.S. does not come from Canada, despite the White House's claims.Spencer Platt/Getty Images

Jonathan Caulkins is professor of operations research and public policy at Carnegie Mellon University’s Heinz College. The views expressed in this piece are the author’s own and do not represent those of the university or any other organization with which he’s affiliated.

Illegally manufactured fentanyl is a national tragedy – one that has taken hundreds of thousands of American lives and almost the same proportion of Canadian lives. Addressing the crisis deserves serious, data-driven policymaking. That’s why it’s troubling that recent rhetoric from the White House has singled out Canada as a significant source of fentanyl flowing into the United States, even citing this as one reason for the application of tariffs on Canadian goods.

Let’s be clear: the data do not support that claim.

In a new report I co-authored for the........

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