Question: In what year did this criminal group, formed by former soldiers of the Mexican Armed Forces and Founded by Nabor Vargas Garcia, break away from their former employer and form their own criminal organization?
Sentence (from "Los Zetas"): Considered by the US government to be "the most technologically advanced, sophisticated, efficient, violent, ruthless, and dangerous cartel operating in Mexico", the organization has expanded beyond the traditional purview of drug trafficking and also runs profitable sex trafficking and gun running rackets.
Relevant evidence: Yes