Can conventional explosives qualify as weapons of mass destruction under Utah law? State v. McManigal Explained

The Utah Court of Appeals recently addressed a critical question in State v. McManigal: whether conventional explosives can constitute weapons of mass destruction (WMDs) under Utah law. The court’s analysis provides important guidance for practitioners handling similar cases.

Background and Facts

McManigal was arrested following an intense police standoff after threatening restaurant employees and making concerning social media posts. Police discovered he had manufactured and stored triacetone triperoxide (TATP) and methyl ethyl ketone peroxide (MEKP) explosives throughout his home, along with seven ignition devices. The explosives were so dangerous that 600 people within a 900-foot radius were evacuated, and specialized bomb squads conducted controlled detonations. McManigal was convicted on six counts of possessing weapons of mass destruction.

Key Legal Issues

McManigal raised two primary challenges: (1) that conventional explosives cannot satisfy the statutory definition of a WMD under Utah Code section 76-10-401(6)(a)(i), and (2) that insufficient evidence supported finding the explosives were designed to cause “widespread” death or injury. He also claimed the jury instruction defining WMDs was inadequate.

Court’s Analysis and Holding

The court rejected McManigal’s argument that WMDs are limited to chemical, biological, or radiological weapons. Applying statutory interpretation principles, the court found that subsection 401(6)(a)(i) defines a standalone variant of WMD as “any item or instrumentality that is designed or intended to cause widespread death or serious bodily injury to multiple victims.” The court noted that other statutory provisions expressly contemplate that explosive devices could constitute WMDs “under circumstances not amounting to a violation of Part 4.”

Regarding the sufficiency of evidence, the court found expert testimony established that the explosives and devices were capable of causing widespread harm. Key evidence included the 900-foot evacuation radius, expert opinions that the devices could function as “actionable IEDs,” and McManigal’s own statement that detonation would “take out this whole block.”

Practice Implications

This decision significantly clarifies Utah’s WMD statute by establishing that conventional explosives can qualify as WMDs when designed for widespread harm. Defense attorneys should focus challenges on the specific design and intended use of explosives rather than categorical arguments about explosive types. The court’s analysis also emphasizes the importance of expert testimony in establishing the destructive capability of explosive devices and the relevance of defendant admissions regarding intended harm.