Reproduction of a letter to the National Commission of Human Rights from criminals, drug dealers, murderers and kidnappers in "El Altiplano," Mexico's highest-security prison. Ronaldo Schemidt/AFP/Getty Images hide caption

itoggle caption Ronaldo Schemidt/AFP/Getty Images

The alleged leader of the Zetas drug cartel, Omar Trevino Morales, is taken under custody to be presented to the press at the Attorney General Office's hangar at the airport in Mexico City, on March 4. Mexican authorities captured Trevino Wednesday, dealing a blow to the feared gang and giving the embattled government a second major arrest in a week. Omar Torres/AFP/Getty Images hide caption

itoggle caption Omar Torres/AFP/Getty Images

People view Mississippi River floodwaters on Sunday, May 8, 2011, in Memphis, Tenn. Mark Humphrey/AP hide caption

itoggle caption Mark Humphrey/AP