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Press Release

Marijuana User Who Possessed Firearms Sentenced to Three Years in Prison

For Immediate Release
U.S. Attorney's Office, Northern District of Iowa
Possessed Multiple Guns, Including One Converted Into a Fully Automatic

A Dubuque man who possessed multiple firearms, including one with a device to convert it into a fully automatic weapon was sentenced February 26, 2024, to three years in federal prison.

Jacqusyn Zechariah Grubb, age 21, from Dubuque, Iowa, received the prison term after a September 29, 2023 guilty plea to possessing a firearm as a marijuana user.

Evidence in the case showed that Grubb possessed multiple firearms, including one that had a conversion device attached making it a fully automatic weapon, and high-capacity magazines.  Grubb also possessed a personally made firearm, also known as a “ghost gun.”  The court also found Grubb possessed a firearm in connection with the offense of possession for marijuana with intent to deliver.

Grubb was sentenced in Cedar Rapids by United States District Court Chief Judge C.J. Williams.  Grubb was sentenced to 36 months’ imprisonment.  He must also serve a three-year term of supervised release after the prison term.  There is no parole in the federal system.

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.

Grubb is being held in the United States Marshal’s custody until he can be transported to a federal prison.

The case was prosecuted by Assistant United States Attorney Emily K. Nydle and investigated by the Dubuque Police Department and the Bureau of Alcohol, Tobacco, and Firearms. 

Court file information at

The case file number is 23-cr-1014.

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Updated February 27, 2024

Project Safe Neighborhoods
Firearms Offenses