Mexico

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A California driver's license bearing the name of Jenni Rivera lies on the ground at the site where a plane allegedly carrying the singer crashed near Iturbide, Mexico, on Sunday Dec. 9, 2012. (AP Photo)

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U.S. Interior Secretary Kenneth L. Salazar signs an agreement on Colorado River water usage as Mexican Commissioner Roberto Salmon looks on Tuesday. It amends a 1944 treaty granting Mexico 1.5 million acre-feet of river water yearly. (Associated Press)

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Some seized artifacts returned to Mexico are displayed on a table during a news conference at the Mexican Consulate in El Paso, Texas, on Oct. 25, 2012. More than 4,000 archaeological artifacts looted from Mexico and seized in the U.S. were returned to Mexican authorities in what experts say is one of the largest repatriation ever made between the neighboring countries. (Associated Press/The El Paso Times)

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Patch, 36, an Auguste clown, poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City, Wednesday, Oct. 24, 2012. Approximately 500 clowns gathered at two local theaters in the capital city to exchange ideas, compete for laughs and show off their comedy performances. Patch has been as a clown for 13 years. (AP Photo/Anita Baca)

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Burbujita poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City. (AP Photo/Anita Baca)

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Rayito Show, 35, an Auguste clown, poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City. Approximately 500 clowns gathered at two local theaters in the capital city to exchange ideas, compete for laughs and show off their comedy performances. (AP Photo/Anita Baca)

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Kiki-evolution, 5, an Auguste clown, poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City, Wednesday, Oct. 24, 2012. Approximately 500 clowns gathered at two local theaters in the capital city to exchange ideas, compete for laughs and show off their comedy performances. (AP Photo/Anita Baca)

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Kika-evolution, 5, an Auguste clown, poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City. (AP Photo/Anita Baca)

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In this Tuesday, Oct. 23, 2012 photo, straight white face clown Tikitiki, 83, poses for a photo during Mexico's 17th annual clown convention, La Feria de la Risa, in Mexico City. Approximately 500 clowns gathered at two local theaters in the capital city to exchange ideas, compete for laughs and show off their comedy performances. (AP Photo/Anita Baca)

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This undated photo provided by U.S. Customs and Border Protection shows Border Patrol agent Nicolas Ivie, who was shot to death Oct. 2, 2012, in Arizona near the U.S.-Mexico line, the first fatal shooting of an agent since 2010. (Associated Press/U.S. Customs and Border Protection)

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**FILE** Vehicles drive Aug. 9, 2012, along the border fence in Nogales, Mexico. (Associated Press)

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**FILE** A Guatemalan river-raft worker steers a group of Central American migrants journeying north to the U.S., across the Suchiate river on a makeshift raft at the Guatemala-Mexico border crossing in Tecun Uman, Guatemala, on Sept. 28, 2012. (Associated Press)

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**FILE** U.S. Customs and Border Protection officers gather along the international border with Mexico near Naco, Ariz. (Associated Press)

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Police examine drums of chemicals for meth that were seized in Queretaro, Mexico. Mexican cartels are flooding U.S. cities with extraordinarily pure meth made in factorylike “superlabs,” a surge in production that has all but negated the nation’s effort to curb meth production at home with tighter controls on key ingredients. (Associated Press)

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Crystal meth dries on a table at an lab in Ensenada, Mexico. Mexican-made meth accounts for about 80 percent of the meth sold in the U.S. (Associated Press)