" Bullough gives the example of a Mexican drug dealer who smuggles product across the border to the US. The drug in question would once have been marijuana, then cocaine, and is now likely to be fentanyl, which is cheap to manufacture and easy to conceal. The drugs are sold in the US for cash, which is used to buy, say, agricultural equipment. "

Wouldn't the person buying the tractor in the US for $$$ have to show where that money came from? Can you show up to John Deere with over a million dollars _in cash_?