Repeat Drug Offender Pleads Guilty to Meth and Firearm Charges

A man who conspired to distribute meth and illegally possessed a firearm pled guilty February 2, 2026, in federal court in Sioux City. 

Seann Mackey, 31, from Mount Pleasant, Iowa admitted that between June 2024 and December 2024, he was involved in a conspiracy that distributed at least 1500 grams of mixed methamphetamine which contained at least 150 grams of pure methamphetamine.  On December 20, 2024, law enforcement apprehended Mackey after he operated a motor vehicle in a high-speed/reckless driving filled chase.  Then during a foot pursuit, Mackey was observed throwing a firearm.  Law enforcement seized methamphetamine, numerous empty baggies and a digital scale from Mackey, along with a Glock 9mm handgun. 

Mackey had three prior convictions for drug offenses, and a conviction for possession of a firearm by a felon. Each of these convictions prohibit Mackey from possessing any firearm and also enhance his sentencing penalties. 

This case is part of Project Safe Neighborhoods (PSN), a program bringing together all levels of law enforcement and the communities they serve to reduce violent crime and gun violence, and to make our neighborhoods safer for everyone. On May 26, 2021, the Department launched a violent crime reduction strategy strengthening PSN based on these core principles: fostering trust and legitimacy in our communities, supporting community-based organizations that help prevent violence from occurring in the first place, setting focused and strategic enforcement priorities, and measuring the results.

Sentencing before United States District Court Judge Leonard T. Strand will be set after a presentence report is prepared.  Mackey remains in custody of the United States Marshal pending sentencing.  Mackey faces a mandatory minimum sentence of 10 years’ imprisonment and a possible maximum sentence of life imprisonment, a $8,250,000 fine, and at least eight years of supervised release following any imprisonment.

The case is being prosecuted by Assistant United States Attorney Shawn S. Wehde 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 https://ecf.iand.uscourts.gov/cgi-bin/login.pl.

The case file number is 25-4006.  Follow us on X @USAO_NDIA.