A Monterrey man now admits he helped wash cartel cash through Texas by hiding drug proceeds in everyday trade, according to federal prosecutors.
Gabriel Arturo Castillo, 52, pleaded guilty in federal court this week to helping run a multimillion-dollar trade-based money-laundering network that moved drug profits from the United States into Mexico. Instead of hauling bulk cash across the border, prosecutors say the group relied on cross-border commerce to repatriate cartel proceeds. Castillo faces a statutory maximum of 20 years in prison and is scheduled to be sentenced on July 7.
According to FOX 26 Houston, Castillo admitted to participating in a multimillion-dollar conspiracy that pushed illicit drug proceeds through Texas into Mexico. Prosecutors say the operation turned U.S. dollars into pesos by purchasing pricey goods in the United States, shipping them to Mexico and reselling them there.
How Investigators Say the Exchange Worked
Federal agents described the setup as a twist on the black-market peso exchange, where merchandise purchases and exports are used to hide the movement of narcotics money. "The specific type of scheme they used is called a black-market peso exchange," said Rodrick Benton, acting special agent in charge of IRS Criminal Investigation’s Houston Field Office, as reported by FOX 26 Houston.
Arrest and Extradition Timeline
Reporting in Mexico and court records state that Castillo was arrested in Monterrey in March 2024 and later extradited to the United States in August 2025, according to Infobae. Prosecutors say the conspiracy ran for at least two years and involved millions of dollars in drug proceeds.
Enforcement and Precedent
The Justice Department and its task forces have long targeted black-market peso exchanges along the Texas border as a weak spot in cartel finances. The U.S. Attorney’s Office in the Southern District of Texas recently detailed a similar two-year, multimillion-dollar scheme that pushed proceeds through Laredo businesses. See the U.S. Department of Justice for background, and related Laredo prosecution for a recent local example of similar charges.
Legal Implications
Castillo pleaded guilty to conspiracy to commit money laundering. The charge carries a potential sentence of up to 20 years in federal prison, and his July 7 hearing will determine his prison term and any forfeiture, prosecutors say. His plea is the latest result of a multi-agency effort that includes DEA and IRS-CI to trace and disrupt the financial networks that keep cartel operations running.
Officials say the case highlights how routine trade and retail channels can be exploited to clean dirty money, and that investigators plan to keep following the funds to identify additional facilitators. For now, federal prosecutors say Castillo’s guilty plea is another step toward dismantling the financial infrastructure behind cross-border drug trafficking.
