Mexican national pleads guilty to heroin trafficking conspiracy in Stockton

Date: Sept. 9, 2025

Contact: newsroom@ci.irs.gov

Alberto Ojeda Lopez of Mexico pleaded guilty today to conspiracy to distribute heroin, U.S. Attorney Eric Grant announced.

According to court documents, Ojeda Lopez conspired with his wife and daughter, co‑defendants Maria Medina Silvas of Mexico, and Alecsa Ojeda de Oregel of Stockton, to distribute heroin in and around Stockton. In September 2022, Ojeda Lopez and Medina Silvas sold an ounce of heroin to an undercover officer. In August 2023, they sold a kilogram of heroin to the undercover officer. The next day, law enforcement seized 2 kilograms of heroin from Ojeda Lopez’s and Medina Silvas’ vehicle. Law enforcement then searched the Stockton residence of Ojeda de Oregel, which was used as a drug and money stash house for the conspiracy, and seized 2.8 kilograms of fentanyl, 2 kilograms of heroin, almost a half of a kilogram of methamphetamine, and $83,119 in cash drug proceeds.

This case is the product of an investigation by the Drug Enforcement Administration, with assistance from the IRS Criminal Investigation, Homeland Security Investigations, and Assistant U.S. Attorney David W. Spencer is prosecuting the case.

Medina Silvas and Ojeda de Oregel are scheduled for jury trial on Feb. 17, 2026. The charges against them are only allegations; they are presumed innocent until and unless proven guilty beyond a reasonable doubt.

Ojeda Lopez is scheduled to be sentenced by Senior U.S. District Judge John A. Mendez on Jan. 27, 2026. Ojeda Lopez faces a maximum statutory penalty of life in prison. The actual sentence, however, 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.

This case was investigated and prosecuted by the California Homeland Security Task Force (HSTF) as part of Operation Take Back America. HSTFs, which were established by President Trump in Executive Order 14159, Protecting the American People Against Invasion, are joint operations led by the Department of Justice and the Department of Homeland Security. Operation Take Back America is a nationwide federal 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 (TCOs), and protect our communities from the perpetrators of violent crime. Operation Take Back America streamlines efforts and resources from the Department’s Organized Crime Drug Enforcement Task Forces (OCDETFs) and Project Safe Neighborhoods (PSN).

IRS Criminal Investigation (IRS-CI) is the law enforcement arm of the IRS, responsible for conducting financial crime investigations, including tax fraud, narcotics trafficking, money laundering, public corruption, healthcare fraud, identity theft and more. IRS-CI special agents are the only federal law enforcement agents with investigative jurisdiction over violations of the Internal Revenue Code, obtaining a 90% federal conviction rate. The agency has 19 field offices located across the U.S. and 14 attaché posts abroad.