Erick Cruz-Olemedo

Four men have been indicted on drug charges after more than a dozen marijuana fields linked to Los Zetas cartel were found across East Texas, the Tyler Morning Telegraph reports.

The men — Erick Cruz-Olemedo, 31; Albert Rueda-Ramirez 23; Ranferi Duarte-Ramirez, 27 and Regulo Ramirez-Duarte, 22 — were charged last week with criminal conspiracy to commit possession of marijuana.

Albert Rueda-Ramirez

Ranferi Duarte-Ramirez

The charges came after a 18 month investigation by multiple agencies lead to the discovery of 15 marijuana sites across East Texas.

Regulo Ramirez-Duarte

At one of those sites, authorities in September found Cruz-Olemedo camping along with 4,000 marijuana plants.

The four men are scheduled for arraignment on June 23 and trial on July 31.