A federal investigation has led to the sentencing of 27 individuals involved in a methamphetamine trafficking organization that was directed from inside Oklahoma prisons. The U.S. Attorney for the Western District of Oklahoma, Robert J. Troester, announced that three inmates—Zachary Clark, Brandon Horne, and Johnny Ross—were central figures in organizing the operation using contraband cell phones while incarcerated.
The two-year investigation was conducted by the Drug Enforcement Administration (DEA) and the Oklahoma Bureau of Narcotics and Dangerous Drugs (OBN). Authorities seized about 90 kilograms of methamphetamine, 22 firearms, and nearly $350,000 in drug proceeds during their work. In total, those convicted will serve almost 235 years collectively in federal prison; one individual received a life sentence.
“Inmates using contraband cell phones behind prison walls orchestrated an entire network to traffic deadly poison in our community,” said U.S. Attorney Robert J. Troester. “Dismantling this operation required a united front between federal and state agencies, committed to stop the flow of drugs and hold the traffickers accountable. I commend the diligent work of law enforcement and prosecutors to destroy this criminal network.”
Joseph B. Tucker, Acting Special Agent in Charge of DEA Dallas, stated: “The arrest, conviction and sentencing of members of this organization and its leadership has undoubtedly made neighborhoods throughout Oklahoma a safer place for our children and families. The DEA will continue to work hand in hand with our state and local law enforcement partners to hold those distributing poison in our communities accountable for their actions.”
OBN Director Donnie Anderson added: “The results from this investigation have no doubt saved lives. These individuals were responsible for orchestrating the distribution of large shipments of meth onto the streets of Oklahoma while behind bars. As meth continues to be one of Oklahoma’s leading killers, my agency is committed to working with our state and federal partners to arrest and prosecute those who threaten the safety of our citizens.”
Court records show that Ross, Clark, and Horne were inmates at the Oklahoma Department of Corrections as early as 2024 when they managed operations linked to the Irish Mob Gang through illegal cell phone use within prison facilities. They coordinated drug distribution—primarily methamphetamine—and collected proceeds with help from associates outside prison walls.
Ross was indicted by a federal Grand Jury on April 16, 2024; Clark and Horne followed about a month later on similar charges related to conspiracy to distribute methamphetamine.
All three pleaded guilty along with 24 others charged with various drug or firearm offenses connected to this case.
Sentences ranged widely among defendants:
– Zachary Clark received life imprisonment plus five years’ supervised release.
– Brandon Horne was sentenced to 360 months (30 years) plus five years’ supervised release.
– Johnny Ross received a sentence of 120 months (10 years) plus five years’ supervised release.
Other sentences varied from several months up to over sixteen years depending on individual involvement.
This case is part of an Organized Crime Drug Enforcement Task Force (OCDETF) initiative which brings together multiple agencies—including federal prosecutors—to target high-level traffickers using collaborative intelligence-led strategies.
Assistant U.S. Attorneys Matthew Anderson, Jason Harley, and David McCrary prosecuted these cases.
Reference is made to public filings for additional information.
