For years, getting caught trying to smuggle drugs across the US-Mexican border meant being handed over to US authorities for prosecution. Problem was, US Attorneys on the border were so swamped with marijuana smuggling cases, the general rule was they wouldn't prosecute for less than 500 pounds. Instead, local prosecutors got those cases, but they were swamped, too. As a result, thousands of Mexican marijuana smugglers never faced prosecution in the US -- they were simply deported back over the border to Mexico.

Reynosa/Hidalgo border crossing (courtesy portland.indymedia.org)

The border agreement is a sign of "our effort to enhance cooperation between the US and Mexico on prosecuting drug trafficking cases," said Arizona US Attorney Dennis Burke.

There is plenty of work to do. In the past year, ICE opened 646 smuggling cases out of busts at the Nogales port of entry. In the fiscal year ending in October 2008, ICE busted 71,000 pounds of pot on the Arizona border.

The program is a pilot program currently operating in Arizona. US officials will be monitoring the cases returned to Mexico, and if satisfied with the results, may extend it all along the border.