According to the DEA in 2020, domestically-produced raw product gets shipped to Mexico to be turned into pills, and then sent back to the US. That pretty much

According to the DEA in 2020, domestically-produced raw product gets shipped to Mexico to be turned into pills, and then sent back to the US. That pretty much always uses the southern border, while Chinese imports came in via the Pacific and the Southern border: https://www.dea.gov/sites/default/files/2020-03/DEA_GOV_DIR-008-20%20Fentanyl%20Flow%20in%20the%20United%20States_0.pdf https://www.dea.gov/sites/default/files/2020-03/DEA_GOV_DIR-... Presumably, if it was effective, that would mean their crackdown either moved pill packaging jobs from Mexico to the US or it off-shored production to China.