Charles Bowden, on the US-Mexico border:
The border is 1,900 miles long. If two people slipped through each mile in a 24-hour period, that would amount to 3,800 people a day. That adds up to 1,387,000 people a year. Or consider this: One bridge from Juarez to El Paso handles 600,000 semi-trucks a year. One semi with a freight load of 24 tons could probably tote enough heroin to satisfy the U.S. market for a year