United States Attorney’s Office Charges 88 Defendants for Federal Drug Offenses During Summer 2025

SIOUX FALLS - United States Attorney Alison J. Ramsdell announced today that the U.S. Attorney's Office indicted 88 defendants between April and August 2025 for federal offenses related to the trafficking of cocaine, fentanyl, and methamphetamine. These federal charges resulted from sophisticated, long-term investigations carried out by federal, state, tribal, and local law enforcement agencies, many of which collaborate through one of the various long-standing drug task forces operating throughout South Dakota.

"Drug traffickers who flood our South Dakota communities with illegal narcotics will be met with the full force of federal prosecution," said U.S. Attorney Alison J. Ramsdell. "The U.S. Attorney's Office in South Dakota is proud to work alongside federal, state, local, and tribal law enforcement agencies to protect the public by disrupting and dismantling drug trafficking organizations. We will continue to use every legal tool available to ensure drug traffickers face significant sentences in federal prison for endangering our communities and fueling addiction."

Leading the effort to identify and dismantle drug trafficking organizations operating in South Dakota are multi-agency drug task forces located throughout the state, including the following:

• Sioux Falls Area Drug Task Force (SFADTF), comprised of the Sioux Falls Police Department, the Minnehaha County Sheriff's Office, the South Dakota Division of Criminal Investigation (DCI), and the Drug Enforcement Administration (DEA)
• Unified Narcotics Enforcement Team (UNET), comprised of the Pennington County Sheriff's Office, the Rapid City Police Department, DCI, the South Dakota Highway Patrol (SDHP), and the South Dakota National Guard (SDNG)
• Badlands Safe Trails Drug Enforcement Task Force, comprised of the Federal Bureau of Investigation (FBI), the Bureau of Indian Affairs-Division of Drug Enforcement (BIA-DDE), DCI, and the Oglala Sioux Tribe Department of Public Safety (OSTDPS)
• Northern Plains Safe Trails Drug Enforcement Task Force, comprised of the FBI, BIA-DDE, DCI, SDHP, SDNG, Cheyenne River Sioux Tribe Law Enforcement Services, Hughes County Sheriff's Office, Tripp County Sheriff's Office, Ziebach County Sheriff's Office, and the Mobridge Police Department

Among the 88 defendants indicted over the course of the last several months were 16 defendants arrested during Operation Snowy Ridge, a two-day, multi-agency drug trafficking takedown in Western South Dakota. The number also includes Defendant Mario Balquier, a large-scale methamphetamine dealer based in Mexico with high-level connections to the Sinaloa Cartel. Balquier, a U.S. citizen, fled to Mexico in 2013 after being indicted on federal drug charges. He was recently taken into custody with the assistance of federal agents from South Dakota following a high-risk fugitive arrest.

Examples of significant illegal drug cases prosecuted by the U.S. Attorney's Office this calendar year, and the federal prison sentences that resulted, include the following:

• United States v. Rikki Barrowman, et al.: Defendant pleaded guilty to Conspiracy to Distribute a Controlled Substance (150 pounds of methamphetamine) throughout Pierre, Rapid City, and several South Dakota reservations and was sentenced to nearly 23 years in federal prison. The case was investigated by the Northern Plains Safe Trails Drug Enforcement Task Force. Assistant U.S. Attorney Meghan Dilges prosecuted the case.
• United States v. Guillermo Calderon, et al.: Defendant pleaded guilty to Conspiracy to Distribute a Controlled Substance (methamphetamine) within the Pine Ridge Reservation and Rapid City area and was sentenced to 25 years in federal prison. The case was investigated by the FBI, DEA, BIA-OJS, and OSTDPS. Assistant U.S. Attorney Anna Lindrooth prosecuted the case.
• United States v. Curtis Cummings, et al.: Following a jury trial, Defendant was convicted of Conspiracy to Distribute a Controlled Substance (fentanyl) Resulting in Death. He was sentenced to 30 years in federal prison; his co-conspirators each received 20-23 years in federal prison. The case was investigated by UNET. Assistant U.S. Attorneys Meghan Dilges and Edward Tarbay prosecuted the case.
• United States v. Nathan Johnson, et al.: This 24-defendant methamphetamine conspiracy spanned the state and was one of the largest drug conspiracies in South Dakota history. The lead co-conspirators received sentences ranging from 27-36 years in federal prison. The case was investigated by the DEA, FBI, United States Postal Inspection Service (USPIS), Internal Revenue Service-Criminal Investigations (IRS-CI), DCI, the SFADTF, and the SDHP, with collaboration from more than a dozen other federal, state, and local law enforcement agencies across the country. Assistant U.S. Attorney Paige Petersen prosecuted the case.
• United States v. Cory Linderman, et al.: Defendant was part of a group of people who worked together to traffic approximately 100 pounds of methamphetamine throughout the Rapid City area. He was sentenced to 23 years in federal prison. Other co-conspirators received sentences ranging from 14-22 ½ years in federal prison. The case was investigated by UNET. Assistant U.S. Attorney Mark Hodges prosecuted the case.
• United States v. Quantiae Harris, et al.: This 26-defendant methamphetamine and fentanyl conspiracy operated throughout the Sioux Falls area. To date, numerous defendants have pleaded guilty and Defendants Hailey Schneiderman and Heather Downey have been sentenced to 16 years and 10 years in federal prison, respectively. The case was investigated by the DEA, the SFADTF, and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Special Assistant U.S. Attorney Mark Joyce is prosecuting the case.
• United States v. Misty Stahlhoefer, et al.: This seven-defendant conspiracy involved the distribution of approximately 30-35 pounds of methamphetamine throughout the Pierre area. Misty Stahlhoefer was sentenced to 21 years in federal prison. Other co-conspirators received sentences ranging from 2-18 years in federal prison. The case was investigated by the FBI's Northern Plains Safe Trails Drug Enforcement Task Force, the Pierre Police Department, the Chamberlain Police Department, and the Lyman County Sheriff's Office. Assistant U.S. Attorney Meghan Dilges prosecuted the case.
• United States v. Calvin Taylor, et al.: Three defendants were charged with Conspiracy to Distribute a Controlled Substance (methamphetamine) in the Aberdeen area. Two defendants pleaded guilty and one was convicted at trial. Defendants Hillard and Fowler have received 10 years and 25 years in federal prison, respectively. Taylor awaits sentencing. Special Assistant U.S. Attorney Mark Joyce is prosecuting the case.

The prosecution of illegal narcotics by the U.S. Attorney's Office is part of Operation Take Back America, a nationwide initiative that marshals the full resources of the United States Department of Justice to 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 Neighborhood (PSN).