April 2, 2012 - Former Tijuana cartel leader Benjamin Arellano Felix is sentenced to 25 years in prison and ordered to forfeit $100 million after pleading guilty to racketeering and conspiracy to launder money.
April 24, 2012 - Using Calderón's strategy, the Mexican government has killed more than 40 major cartel members. The Economist points out that between 2007 and 2008, the number of drug-related killings in Mexico rose by 29 percent. In the next two years, it rose by 22 percent, then by 28 percent. Last year, however, there were signs of a plateau with only an 8 percent rise. A Pew poll conducted last spring shows that 45 percent of Mexicans believe the government is making progress against the cartels; 83 percent support Calderón's strategy of using the army to fight the cartels.
May 13, 2012 - Mexican authorities find at least 49 decapitated and dismembered bodies along a highway in Nuevo Leon state, between the cities of Monterrey and Reynosa.
July 7, 2012 - In an interview with CNN, Mexico's president-elect Enrique Peña Nieto calls for a new debate on the drug war and says the U.S. must play a prominent role.
July 12, 2012 - A U.S. Senate Foreign Relations Committee report concludes Mexico's frontal assault against drug cartels has been "largely ineffective" and in some instances counterproductive to reducing violence. The report recommends the focal point of Mexico's anti-drug cooperation should be training and institution building in police forces and judiciary.
August 31, 2012 - Eduardo Arellano-Felix, an alleged senior member of a Tijuana-based drug cartel, is extradited from Mexico to the United States. Arellano-Felix was arrested on October 25, 2008, after a gun battle with Mexican forces.
September 3, 2012 - In his final state of the nation address, Mexican President Felipe Calderon defends his government's approach to combating crime and drugs and criticizes the United States for providing criminals with almost "unlimited access" to weapons.
September 4, 2012 - Mexican authorities announce the capture of Mario Cardenas Guillen, also known as "M1" and "The Fat One," a suspected leader of the Gulf cartel.
September 27, 2012 - Mexican marines capture and arrest a man claiming to be Ivan Velazquez Caballero, alias "El Taliban." Velazquez Caballero is one of the top leaders of Los Zetas.
October 9, 2012 - Mexican authorities confirm that Mexican marines killed Heriberto Lazcano Lazcano, leader of the Zetas cartel, in a shootout on October 7. Lazcano's body was stolen from a funeral home on October 8, but authorities had already taken fingerprints and photographs to confirm his identity.
December 1, 2012 - Mexican President Enrique Peña Nieto takes office.
February 21, 2013 - A report published by Human Rights Watch criticizes Mexican security forces and estimates more than 60,000 people were killed in drug-related violence from 2006 to 2012.
July 15, 2013 - Los Zetas cartel leader Miguel Angel Trevino Morales, known as Z-40, is detained by Mexican authorities in an operation in the Mexican border state of Tamaulipas, state media reports.
August 20, 2013 - Mario Armando Ramirez, ranking member of the Gulf cartel and also known as X-20, is captured in Reynosa, near Texas.
August 20, 2013 - Eduardo Arellano-Felix is sentenced to 15 years in U.S. federal prison for his role as CFO in the drug cartel organization.