Trucking dwarfs them. Since the 1994 NAFTA treaty between the United States and Mexico, tens of thousands of trucks cross the border from Tijuana, Juárez, and Nuevo Laredo every day. Most of them carry legitimate cargo. Many of them carry drugs. It’s the largest commercial border in the world, carrying almost $5 billion in trade a year. Given the sheer volume of traffic, U.S. Customs can’t come close to searching every truck. Even a serious effort to do so would cripple U.S.-Mexican trade. Not for nothing was NAFTA often referred to as the “North American Free Drug Trade Agreement.”
