Iowa man sentenced to 15 years in prison for third federal drug conviction, following ICE HSI, joint law enforcement partner, investigation

SIOUX CITY, Iowa - A man who possessed with intent to distribute methamphetamine was sentenced on April 25, 2022, to 15 years in federal prison, following a U.S. Immigration and Customs Enforcement’s (ICE) Homeland Security Investigations (HSI), joint law enforcement partner, investigation.

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 Homeland Security Investigations; the Drug Enforcement Administration; Sioux City, Iowa, Police Department; 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.

HSI is a directorate of ICE and the principal investigative arm of the U.S. Department of Homeland Security (DHS), responsible for investigating transnational crime and threats, specifically those criminal organizations that exploit the global infrastructure through which international trade, travel, and finance move. HSI’s workforce of over 10,400 employees consists of more than 7,100 special agents assigned to 220 cities throughout the United States, and 80 overseas locations in 53 countries. HSI’s international presence represents DHS’s largest investigative law enforcement presence abroad and one of the largest international footprints in U.S. law enforcement.

Learn more about HSI’s mission to combat narcotics @HSIKansasCity.