And not just at the national level. In February, Republican San Diego County Supervisor Jim Desmond posted a video on social media saying that one of the things that concerns him about, “how people are just able to walk across the border and get here,” is fentanyl. The implication is that migrants crossing in remote parts of the border are bringing drugs with them.

But data from U.S. Customs and Border Protection (CBP) and other federal agencies show the vast majority of fentanyl comes through legal ports of entry. And the people bringing it into the country are native born Americans.

Approximately 80% of people prosecuted and convicted of federal drug trafficking offenses were U.S. citizens, according to Tara McGrath, U.S. Attorney for the Southern District of California.

• American citizens smuggle more fentanyl into the US than migrants, data show