Pot, and the impoverished undocumented immigrants who often bring it, are no longer flowing across the border at the rate they once were. This decline has virtually nothing to do with expensive security innovations at the border and everything to do with legalization in the United States. If it were any other industry, one imagines the president would be delighted: When it comes to pot, customers prefer to buy American.
https://reason.com/archives/2019/03/03/the-wall-wont-end-pot-smugglin
