"Today I want to explore what I believe is another important component of the conspiracy, and I use that term advisedly, to keep the border open no matter what. Let me cut right to the chase: It's about drugs, stupid.
Since 1984, the ruling governments of Mexico have been operating under a pact signed during the reign of President Miguel de la Madrid and the drug lords. The deal required the cartels to keep their billions of narco-dollars in Mexico's nationalized banks in exchange for quiet cooperation from the government. In other words, the drug lords could expect to carry out their business unmolested.
Why was such a deal necessary for the Mexican government? Because its economy was sinking and because drugs are the biggest of all businesses in the country.
Let me underline that last statement for you. It is very important. Mexico's biggest cash export its biggest business is drugs sold to the U.S."