while working in los zetas, vargas garcía commanded a group of zeta members in the mexican states of campeche, tabasco, and chiapas. he was a pioneer in smuggling narcotics for los zetas through this region of southern mexico, and was able to create a pathway for illegal goods flowing from cancún to matamoros, tamaulipas in the northeastern part of the country. vargas garcía worked for the drug lords heriberto lazcano lazcano and jorge eduardo costilla sánchez after cárdenas guillén was extradited to the united states. he also controlled human trafficking rings of illegal aliens from central america.