From businessinsider.com:

Despite eight years of violence spanning two Mexican presidential administrations, the country’s drug war has continued with few signs that Mexico’s drug cartels are waning in power.

Formally launched in December 2006 by former President Felipe Calderon and then continued under his successor, Enrique Pena Nieto, the drug war struck a series of high profile blows against Mexican cartels. At the same time, it triggered nationwide violence without coming anywhere close to defeating the country’s drug traffickers.

http://www.businessinsider.com/mexicos-drug-war-is-taking-worse-turn-2015-5#ixzz3aYN0OPXc