Is fentanyl from Canada really invading the U.S.? What we know so far about Trump’s border claim

The language from the Drug Enforcement Administration was stark. Canada had become a haven for chemists making a drug gaining popularity in the Lower 48. Most of the product seized in the U.S. was “manufactured in clandestine laboratories in Canada and smuggled across the Northern Border,” the DEA warned. Asian transnational criminal organizations, it said, were producing tens of millions of tablets to be sold in the U.S. market.That was 2015, and the drug was MDMA, better known as ecstasy.