There is also no evidence that any significant level of illegal fentanyl — the primary killer in U.S. overdose deaths — is produced in South America, according to the United Nations Office on Drugs and Crime (UNODC).

UNODC analyzes global drug trafficking based on reporting from its member states, open sources and drug seizure information.

Most illegal fentanyl enters the U.S. from Mexico, per UNODC and the U.S. Drug Enforcement Administration. Illicit fentanyl can also be diverted, or stolen, from legal sources as medical professionals use the drug.

Yet President Donald Trump has linked his administration’s attacks on drug vessels in Latin America to the fentanyl crisis, among other drugs.