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Press Release

Sioux City Man Sentenced to 15 years in Prison for Third Federal Drug Conviction.

For Immediate Release
U.S. Attorney's Office, Northern District of Iowa
Mammen was found in possession of a bag containing 17 small bags of meth, packaged for distribution.

A man who possessed with intent to distribute methamphetamine was sentenced on April 25, 2022, to 15 years in federal prison.

Kory Mammen, 52, from Sioux City, Iowa, pled guilty on January 4, 2022, to possession with intent to distribute methamphetamine.  In 2000 and 2011, Mammen was convicted in the United States District Court for the Northern District of Iowa of conspiracy to distribute methamphetamine.

At the plea and sentencing hearings, evidence showed that on March 26, 2021, Mammen was stopped by law enforcement for a traffic violation in Sioux City, Iowa.  Due to suspicious behavior, law enforcement deployed a K-9 on the exterior of the car which indicated to the presence of controlled substances.  A search of the car revealed a black bag under the driver’s seat which contained two syringes and 17 smaller bags containing a total of 42 grams of methamphetamine.  On November 15, 2021, during Mammen’s arrest on the charges in this case, he was found with several baggies which contained approximately 65 grams of methamphetamine.  Mammen admitted to law enforcement he planned to distribute some or all of the methamphetamine to others.  

Sentencing was held before United States District Court Chief Judge Leonard T. Strand.  Mammen was sentenced to 180 months’ imprisonment and must serve an eight-year term of supervised release following the imprisonment.  There is no parole in the federal system.  Mammen remains in custody of the United States Marshal until he can be transported to a federal prison.

The case was prosecuted by Assistant United States Attorney Patrick T. Greenwood and was investigated by Tri-State Drug Task Force based in Sioux City, Iowa, that consists of law enforcement personnel from the Drug Enforcement Administration; Sioux City, Iowa, Police Department; Homeland Security Investigations; Woodbury County Sheriff’s Office; South Sioux City, Nebraska, Police Department; Nebraska State Patrol; Iowa National Guard; Iowa Division of Narcotics Enforcement; United States Marshals Service; South Dakota Division of Criminal Investigation; and Woodbury County Attorney’s Office.   

Court file information at

The case file number is 21-4091.  Follow us on Twitter @USAO_NDIA.

Updated April 27, 2022

Drug Trafficking