LAREDO, Tex. — The five burly, sweat-soaked customs agents were in unfamiliar territory.

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Times Topics: Janet Napolitano | Homeland Security DepartmentThey had come from frigid ports in Baltimore and Boston to work in the sweltering heat of the Southwestern border. But the biggest change was that they were looking at what was leaving the country, rather than what was coming in.

“You know, early this week I met with President Obama, and this morning I met with President Calderón of Mexico,â€