A program hosted by U.S. Customs and Border Protection allows private companies and local governments to reimburse the federal government for additional services.
Tougher enforcement of immigration laws in the U.S. and an economic downturn have persuaded many Mexican immigrants to return home, but some face hard times there despite Mexico's growing economy.
Every day, more than a billion dollars worth of goods moves across the border between Mexico and the U.S. But customs wait times are inconsistent, which is a problem for manufacturers.
