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The migrants walk for days through miles of mesquite scrub, running low on food and sometimes water, paying armed drug thug "guides" and dodging U.S. law enforcement officers along the way. And still they keep coming.
The latest figures show that Arizona, which is about to put into effect the nation's toughest immigration law, also is the only border state where illegal crossings are on the rise.
President Barack Obama has called it "misguided" and promised to begin tackling an immigration overhaul.