Yet the real problem the next president faces is not so much the drugs themselves, but the cartels and major traffickers who profit from the trade and bloody the streets. The U.S. Treasury department recently called the Zetas cartel's leader, Joaquín
"El Chapo" Guzmán, "the world's most powerful drug trafficker," according to the New York Times
The Zetas started out as the military wing of the Gulf Cartel, but has operated independently since 2010.
Above, Sergio Antonio Mora Cortes, aka "El Toto," and Julian Zapata Espinoza, aka "El Piolin," of the Zetas
-- accused of the murder of U.S. Immigration and Customs Enforcement agent Jaime Zapata on February 15, 2011 -- are presented to the press at the Mexican Navy headquarters in Mexico City on Feb. 28, 2011.