Another Sentence and Guilty Plea in Mexican-Based Drug Trafficking Ring Involving Over 12,900 Pounds of Methamphetamine and 22 Defendants

FRESNO, Calif. - One defendant was sentenced and one pleaded guilty Monday in an investigation named "Operation Toxic Waste" that involved 22 defendants, 12,900 pounds of methamphetamine, and multiple firearms, U.S. Attorney Eric Grant announced.

Sergio Pena, 32, of La Puente, was sentenced by U.S. District Judge Jennifer L. Thurston to 15 years and eight months in prison for trafficking firearms and methamphetamine. Also, Ruben Saenz, 38, of Los Angeles, pleaded guilty to conspiracy to distribute methamphetamine. Saenz is scheduled to be sentenced on July 13, 2026. He faces a mandatory minimum of 10 years and a maximum statutory penalty of life in prison.

According to court documents, Operation Toxic Waste was an investigation into a sophisticated drug trafficking ring that resulted in the seizure of over 12,900 pounds of methamphetamine, over 50 pounds of a fentanyl mixture, 39 pounds of cocaine, and 22 pounds of heroin. The drug trafficking organization smuggled methamphetamine, fentanyl, and cocaine in portable projectors and batteries, under the guise of a legitimate transportation business. The organization also hid thousands of pounds of methamphetamine inside semi-trucks and hundreds of pounds of liquid methamphetamine in the gas tanks of cars driven across the border. The Mexico-based organization monitored the narcotics using GPS tracking devices hidden with the smuggled drugs.

During the conspiracy, Saenz transported thousands of pounds of methamphetamine in a rented moving truck. In September 2023, officers pulled him over after he left a warehouse in Ontario, California, in a moving truck. Officers found more than 4,700 pounds of methamphetamine inside the truck.

Meanwhile, Pena joined the drug trafficking organization in March 2023. He was a U.S.-based reseller of the organization's methamphetamine. He mailed and sold large amounts of methamphetamine that had been imported from Mexico. During the period under investigation, he also sold more than a dozen firearms and a machine gun conversion device.

In total, 22 individuals have been charged as part of the drug trafficking conspiracy. In addition to Pena and Saenz, the following ten defendants have either been sentenced or have pleaded guilty and await sentencing:

• Jose Nunez, 44, of Lancaster, pleaded guilty to conspiracy to distribute methamphetamine. On Aug. 25, 2025, he was sentenced to 21 years and 10 months in prison.
• Jesus Perez Garcia Jr., 26, of Los Angeles, pleaded guilty to conspiracy to distribute methamphetamine. On Aug. 25, 2025, he was sentenced to 19 years and seven months in prison.
• Adolfo Montiel, 47, of Lancaster, pleaded guilty to conspiracy to distribute methamphetamine and fentanyl. On March 31, 2025, he was sentenced to 16 years and four months in prison.
• Calvin Guntetong, 28, of North Hollywood, pleaded guilty to conspiracy to distribute methamphetamine. On July 28, 2025, he was sentenced to seven years and one month in prison.
• Jesus Rafael Ulloa Vallejo, 27, of North Hills, pleaded guilty to possession with intent to distribute methamphetamine. On Jan. 12, 2026, he was sentenced to four years and three months in prison.
• Jacklyn Saenz, 35, of Los Angeles, pleaded guilty to conspiracy to distribute methamphetamine. On Oct. 20, 2025, she was sentenced to three years and five months in prison.
• Luz Maria Cobrera Salazar, 43, of Mexico, pleaded guilty to conspiracy to distribute methamphetamine. On March 31, 2025, she was sentenced to two years and six months in prison.
• Allen Khamtrashyan, 30, pleaded guilty on Sept. 23, 2025, to conspiracy to distribute methamphetamine. He is scheduled to be sentenced on June 29, 2026, and faces up to 20 years in prison.
• Christian Jair Sanchez Rodriguez pleaded guilty on Feb. 9, 2026, to conspiracy to distribute methamphetamine. He is scheduled to be sentenced on May 11, 2026, and faces up to 20 years in prison.
• Emily Vela, 25, of Van Nuys, pleaded guilty on June 23, 2025, to conspiracy to distribute and possess with intent to distribute methamphetamine. She is scheduled to be sentenced on May 18, 2026, and faces up to 20 years in prison.

Charges are pending against the remaining defendants, who face varying maximum sentences of between 20 years and up to life in prison. The charges are only allegations; the defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt. And as to defendants who await sentencing, their sentences will be determined at the discretion of the court after consideration of any applicable statutory factors and the federal Sentencing Guidelines, which take into account a number of variables.

The Federal Bureau of Investigation conducted the investigation. Assistant U.S. Attorney Justin J. Gilio and Cody S. Chapple are prosecuting the case.

This case is part of Operation Synthetic Opioid Surge (S.O.S.) a program designed to reduce the supply of deadly synthetic opioids in high impact areas as well as identifying wholesale distribution networks and international and domestic suppliers. In July 2018, the Justice Department announced the creation of S.O.S., which is being implemented in the Eastern District of California and nine other federal districts.

This case is also part of Operation Take Back America, a nationwide initiative that marshals the full resources of the Department of Justice to repel the invasion of illegal immigration, achieve the total elimination of cartels and transnational criminal organizations, and protect our communities from the perpetrators of violent crime.