“the vast majority of fentanyl brought into the U.S. is not carried by illegal immigrants or the result of porous borders: From 2019 to 2024, 80.2 percent of the people arrested at the border with fentanyl were U.S. citizens, according to David J. Bier, director of immigration studies at the Cato Institute.
And as NPR reported last year, “the vast majority of illicit fentanyl—close to 90%—is seized at official border crossings.””