Mexico-Bound Immigrants Face Scrutiny at the Border

Analleli Rios Ramirez, 24, right, is moving back to Mexico from the United States. Efforts by the Obama administration to reduce the flow of guns and drug money from the United States to Mexico are increasing security at the border for those heading south.

By MARC LACEY
Published: August 9, 2011

NOGALES, Ariz. — An American immigration agent bounded up the steps of a bus about to cross the United States-Mexico border recently and demanded to see the papers of all those aboard. “Papers!â€