By 2010, Nogales, which didn't merit a dot on an 1888 map of the Rio Grande River regions produced by U.S. engineers, had grown into a cross-border metropolitan area of more than 400,000 people.

Marijuana, coke, meth, and more: Michael Corey of the Center for Investigative Reporting maps out seizures by checkpoints along the border. As comprehensive immigration reform winds its way ...