I. The Statutory Framework

The National Firearms Act of 1934, codified at 26 U.S.C. § 5801 et seq., imposes registration and tax requirements on the manufacture, transfer, and possession of certain categories of weapons. Section 5845(f) defines a “destructive device” in two parts. The first provides that the term means “any explosive, incendiary, or poison gas (A) bomb, (B) grenade, (C) rocket having a propellant charge of more than four ounces, (D) missile having an explosive or incendiary charge of more than one-quarter ounce, (E) mine, or (F) similar device.”¹

The statute does not define “similar device.” The legislative history does not define “similar device.” The ATF has interpreted the term through a series of administrative rulings that classify specific weapons on a case-by-case basis, including pen guns, cane guns, and certain 12-gauge shotguns deemed not suitable for sporting purposes.² The common thread in these determinations is functional: if a device expels a projectile or payload through an explosive or chemical reaction for the purpose of causing harm, it falls within the statutory definition.

Separately, 18 U.S.C. § 842(a) provides that it shall be unlawful for any person to engage in the business of manufacturing explosives without a license issued under 18 U.S.C. § 843. The term “explosive materials” is defined at 18 U.S.C. § 841(c) to include “explosives, blasting agents, and detonators.” The term “explosives” at § 841(d) means “any chemical compound mixture, or device, the primary or common purpose of which is to function by explosion.”³

The Chemical Weapons Convention, ratified by the United States in 1997 and implemented through the Chemical Weapons Convention Implementation Act of 1998 (22 U.S.C. § 6701 et seq.), defines a “toxic chemical” as “any chemical which through its chemical action on life processes can cause death, temporary incapacitation or permanent harm to humans or animals,” regardless of origin or method of production. The Convention further defines a “key component of binary or multicomponent chemical systems” as “the precursor which plays the most important role in determining the toxic properties of the final product and reacts rapidly with other chemicals in the binary or multicomponent system.”⁴

We will apply these definitions to an insect.

II. The Weapon System

The bombardier beetle is a member of the ground beetle family Carabidae, subfamily Brachininae. There are more than 500 described species worldwide, distributed across every inhabited continent.⁵ The genus Brachinus alone accounts for approximately 300 species. In the United States, roughly 40 species of bombardier beetles have been documented, with populations concentrated in temperate woodlands and grasslands from the Atlantic coast to California.⁶

Each beetle is equipped with a paired glandular system located in the posterior abdomen. The system consists of two distinct components: a reservoir chamber and a reaction chamber, connected by a muscularly controlled valve. The reservoir chamber stores two chemical precursors in aqueous solution: hydroquinone (a reducing agent) and hydrogen peroxide (an oxidizing agent). These precursors are held in concentrations of approximately 25 percent hydroquinone and 10 percent hydrogen peroxide by weight.⁷

When the beetle is threatened, it opens the valve between the reservoir and reaction chambers. The reaction chamber is lined with cells that secrete two catalytic enzymes: catalase and peroxidase. Upon contact with these catalysts, the hydrogen peroxide decomposes exothermically into water and molecular oxygen, while the peroxidase catalyzes the oxidation of hydroquinone to benzoquinone. The combined reaction generates temperatures approaching 100°C and produces a pressurized mixture of benzoquinone vapor, steam, and oxygen that is expelled through an abdominal turret with an audible detonation.⁸

In 2015, a research team from MIT, the University of Arizona, and Brookhaven National Laboratory used synchrotron X-ray imaging to observe the internal mechanics of the bombardier beetle’s discharge in real time. Their study, published in Science, revealed that the spray is not a single continuous blast but a series of rapid pulses, with the reaction chamber cycling through filling, detonation, and expulsion phases at frequencies exceeding 500 pulses per second. The valve between the reservoir and reaction chambers acts as a passive pressure-relief mechanism, opening when chamber pressure drops below a threshold and closing when the exothermic reaction builds pressure above it.⁹

The discharge can be directed through a rotatable abdominal turret capable of aiming the spray across an arc of approximately 270 degrees. Research by Eisner and Aneshansley at Cornell, published in the Proceedings of the National Academy of Sciences, demonstrated that the African bombardier beetle Stenaptinus insignis can target individual legs of an attacking ant with precision sufficient to disable specific appendages without wasting propellant on the broader body surface.¹⁰

The spray is lethal to other insects and small arthropods. It produces chemical burns and acute respiratory distress in larger organisms. A 2018 study by Sugiura and Sato, published in Biology Letters, documented that bombardier beetles swallowed by the toad Bufo japonicus detonated their chemical spray inside the toad’s stomach, causing the toad to vomit the beetle alive. Forty-three percent of beetles tested survived ingestion by triggering their chemical defense system from within the predator’s gastrointestinal tract.¹¹

We did not make this up. The beetle detonates a chemical weapon inside the stomach of a predator that has already eaten it and escapes alive. The peer-reviewed literature confirms it.

III. The Destructive Device Classification

Returning to 26 U.S.C. § 5845(f)(1): a destructive device includes any explosive, incendiary, or poison gas “bomb, grenade, rocket, missile, mine, or similar device.” The bombardier beetle’s discharge mechanism satisfies multiple categories simultaneously.

It is explosive. The reaction between hydrogen peroxide and hydroquinone in the presence of catalytic enzymes produces a rapid exothermic decomposition that generates gas pressure sufficient to expel the contents of the reaction chamber at velocities comparable to a commercial aerosol spray. The MIT synchrotron study confirmed that each pulse involves a discrete detonation event, not a passive chemical seep.⁹

It is incendiary. The discharge temperature approaches 100°C, the boiling point of water. A study by Aneshansley, Eisner, Widom, and Widom published in Science in 1969 measured the temperature of the bombardier beetle’s spray at 100°C exactly, confirming that the beetle produces a discharge at a temperature sufficient to cause thermal injury to biological tissue.¹² Protocol III of the Convention on Certain Conventional Weapons defines an “incendiary weapon” as “any weapon or munition which is primarily designed to set fire to objects or to cause burn injury to persons through the action of flame, heat, or combination thereof, produced by a chemical reaction of a substance delivered on the target.”¹³ The bombardier beetle’s spray produces burn injury through heat generated by a chemical reaction of substances delivered on the target. The Protocol was not written with insects in mind. The language does not exclude them.

It is a poison gas device. Benzoquinone, the primary toxic product of the beetle’s detonation, is classified by the Occupational Safety and Health Administration as a severe irritant to the eyes, skin, and respiratory tract. OSHA’s permissible exposure limit for benzoquinone is 0.1 parts per million averaged over an eight-hour workday, one of the lowest PELs assigned to any organic compound.¹⁴ The National Institute for Occupational Safety and Health classifies benzoquinone as “immediately dangerous to life or health” at concentrations above 2 parts per million.¹⁵ The beetle delivers it at close range, in vapor form, at boiling temperature.

The category “(F) similar device” exists as a statutory catch-all precisely to capture weapons that do not fit neatly into categories (A) through (E) but function equivalently. The ATF has invoked this provision to classify improvised explosive devices, modified fireworks, and commercial pyrotechnic equipment as destructive devices when their design or use produces explosive or incendiary effects.¹⁶ The bombardier beetle’s abdominal weapon system produces explosive, incendiary, and toxic chemical effects simultaneously. It does not merely qualify under the catch-all. It qualifies under the primary categories.

IV. The Binary Chemical Weapon

The Chemical Weapons Convention’s definition of a chemical weapon includes “toxic chemicals and their precursors” as well as “munitions and devices, specifically designed to cause death or other harm through the toxic properties of those toxic chemicals.” The Convention defines a “toxic chemical” as any chemical that “through its chemical action on life processes can cause death, temporary incapacitation or permanent harm to humans or animals.”⁴

Benzoquinone causes death to insects and temporary incapacitation to larger animals. It satisfies the definition.

The Convention further defines a binary chemical weapon system through the concept of a “key component”: “the precursor which plays the most important role in determining the toxic properties of the final product and reacts rapidly with other chemicals in the binary or multicomponent system.” The bombardier beetle stores hydroquinone and hydrogen peroxide in separate compartments. They are precursors. They react rapidly when combined. One of them, the hydroquinone, plays the most important role in determining the toxic properties of the final product, benzoquinone. This is a binary chemical weapon system as the Convention defines it.

The United States military operated its own binary chemical weapons program from the 1950s through the 1990s. The M687 binary chemical artillery projectile, developed for the U.S. Army, contained two relatively nontoxic precursors in separate canisters that mixed upon firing to produce the nerve agent GB (sarin). The operational principle was identical to the bombardier beetle’s: store precursors separately, combine them at the moment of use, deliver the toxic product to the target.¹⁷ The Army spent decades and billions of dollars developing this technology. The beetle has been operating it for approximately 100 million years.¹⁸

The Convention’s list of “Purposes Not Prohibited” includes “industrial, agricultural, research, medical, pharmaceutical or other peaceful purposes” and “military purposes not connected with the use of chemical weapons.” Self-defense is not enumerated. The beetle’s exclusive use of its binary chemical weapon system is to cause harm to other organisms that approach it. This is neither agricultural, pharmaceutical, nor peaceful. It is, by the beetle’s own operational pattern, a weapons deployment.

V. The Federal Explosives License

Title 18, United States Code, Section 842(a)(1) provides that it shall be unlawful for any person “to engage in the business of importing, manufacturing, or dealing in explosive materials without a license issued under section 843 of this chapter.” The penalty, under § 844(a), is a fine of up to $10,000 or imprisonment for not more than ten years, or both.³

The bombardier beetle manufactures explosive materials. The reaction in its abdominal chamber produces a rapid exothermic decomposition, generates gas under pressure, and expels a payload through a directed nozzle. If the ATF’s own definition of “explosives” at § 841(d) means “any chemical compound mixture, or device, the primary or common purpose of which is to function by explosion,” then the bombardier beetle’s reaction chamber is an explosive device whose primary purpose is to function by explosion. That is not an inference. That is its job description.

A Federal Explosives License, obtained by submitting ATF Form 5400.13/16, costs $200 for a three-year term. The application requires disclosure of the applicant’s business name, address, responsible persons, and storage facilities. It requires fingerprinting. It requires a background check. It requires compliance with 27 CFR Part 555, which specifies minimum standards for the storage of explosive materials, including approved magazines with specific locking mechanisms, ventilation, and distance requirements from inhabited buildings.¹⁹

The bombardier beetle stores its explosive precursors in unventilated abdominal reservoirs with no locking mechanism, no distance buffer from inhabited tissue, and no fire suppression system. The storage facility is located inside the manufacturer, which is simultaneously the delivery platform. No licensed explosives facility in America is permitted to operate under these conditions. The beetle operates under these conditions in every county of every state in which it is found.

The number of unlicensed manufacturing operations is not trivial. A single female bombardier beetle lays approximately 10 to 15 eggs per clutch, with multiple clutches per breeding season.²⁰ Each offspring, upon reaching maturity, is equipped with its own binary chemical weapon system. No license is transmitted from parent to offspring. No license exists to transmit. The proliferation is horizontal, vertical, and unrestricted.

VI. The Scale of Noncompliance

There are more than 500 described species of bombardier beetles in the subfamily Brachininae, distributed across North and South America, Europe, Africa, Asia, and Australia.⁵ In the United States alone, approximately 40 species have been documented, with the genus Brachinus represented in nearly every state.⁶

Population estimates for individual bombardier beetle species are imprecise, as is typical for small ground-dwelling insects, but entomological surveys consistently find bombardier beetles in densities of dozens to hundreds per hectare in suitable habitat. The Carabidae is one of the most species-rich families in the entire order Coleoptera, itself the most species-rich order in the animal kingdom. J.B.S. Haldane’s possibly apocryphal observation about the Creator’s “inordinate fondness for beetles” is relevant here: whatever design authority produced the Coleoptera appears to have mass-produced chemical weapons platforms with particular enthusiasm.²¹

The fossil record confirms that bombardier beetles have been manufacturing binary chemical weapons since at least the Cretaceous period, approximately 100 million years ago. Fossil evidence of pygidial defense glands in carabid beetles has been documented in amber deposits from the Cretaceous of Myanmar, and phylogenetic analysis by Ober and Heider (2010) placed the divergence of the Brachininae within this timeframe.²² The National Firearms Act was passed in 1934. The Chemical Weapons Convention entered into force in 1997. The beetle’s weapons program predates both by a margin of roughly 99,999,900 years.

The statute of limitations for federal explosives violations is five years under 18 U.S.C. § 3282. The bombardier beetle’s continuous manufacturing operation renders the limitations question moot. Each detonation is a new violation. Each newly hatched beetle that matures and assembles its first chemical weapon system is a new act of unlicensed manufacturing. The ongoing criminal enterprise has been refreshing its own statute of limitations for 100 million years.

VII. The Arms Export Problem

The Arms Export Control Act of 1976, codified at 22 U.S.C. § 2778, authorizes the President to control the import and export of defense articles and defense services. The International Traffic in Arms Regulations (ITAR), administered by the State Department’s Directorate of Defense Trade Controls, implement this authority through the United States Munitions List.²³ Category IV of the Munitions List includes “launch vehicles, guided missiles, ballistic missiles, rockets, torpedoes, bombs, and mines.” Category V includes “explosives and energetic materials, propellants, incendiary agents, and their constituents.”

Bombardier beetles cross international borders. They fly. The genus Brachinus is found in North America, Europe, Asia, and Africa. No export license has ever been obtained under ITAR for the transfer of a bombardier beetle’s chemical weapons system from one country to another. No end-user certificate has been filed. No Commodity Jurisdiction determination has been requested from the Directorate of Defense Trade Controls to establish whether the bombardier beetle’s abdominal weapons platform constitutes a defense article requiring export authorization.

This is not an academic concern. The United States has prosecuted individuals under ITAR for the unauthorized export of items as mundane as satellite components, rifle scopes, and night-vision goggles. In 2007, the Department of Justice secured a 57-month prison sentence against a Florida man for illegally exporting body armor to a buyer in Jamaica.²⁴ The bombardier beetle exports a binary chemical weapon system across every international border its flight path crosses. No arrest has been made.

VIII. The Enforcement Gap

The Bureau of Alcohol, Tobacco, Firearms and Explosives employs approximately 5,300 personnel, including roughly 2,600 special agents and 700 industry operations investigators. In fiscal year 2024, the ATF conducted over 10,000 compliance inspections of federally licensed explosives dealers and manufacturers.²⁵ It inspected zero abdominal reaction chambers. It issued zero citations for unlicensed chemical detonation. It conducted zero compliance reviews of any organism in the subfamily Brachininae.

The Organisation for the Prohibition of Chemical Weapons, which administers the Chemical Weapons Convention from its headquarters in The Hague, has conducted more than 4,000 inspections across 193 member states since the Convention’s entry into force in 1997.²⁶ It has inspected military arsenals, industrial chemical plants, and former weapons production facilities. It has not inspected a single rotting log, meadow, or compost pile in which bombardier beetles manufacture and stockpile their binary chemical weapons.

This is not an oversight in the sense that the agencies have considered the question and declined to act. It is an oversight in the sense that the question has never been asked. The regulatory apparatus built to control explosive and chemical weapons has been designed, funded, staffed, and operated on the assumption that the entities manufacturing these weapons are human beings or human organizations. The assumption is incorrect. The most prolific manufacturer of binary chemical weapons on the North American continent has six legs, a body length of approximately 15 millimeters, and a production history that predates the flowering plants.

IX. The Self-Defense Question

It may be argued that the bombardier beetle deploys its chemical weapon system exclusively in self-defense, and that this mitigating circumstance should exempt it from regulatory scrutiny. Federal law does not support this position.

The National Firearms Act does not contain a self-defense exemption for destructive devices. An individual who manufactures a pipe bomb for the stated purpose of home defense has committed a federal felony. An individual who constructs an improvised incendiary device to protect against intruders has committed a federal felony. The purpose of the device does not alter its legal classification. A bomb manufactured for self-defense is still a bomb. It still requires registration. It still requires a tax payment. It still requires a Federal Explosives License for its manufacture.

The Chemical Weapons Convention addresses this point explicitly. Article I, Section 1 provides that each State Party undertakes “never under any circumstances” to develop, produce, stockpile, or use chemical weapons.²⁷ The phrase “under any circumstances” was drafted to foreclose precisely the kind of defensive-use argument that might be raised on behalf of the bombardier beetle. The Convention’s negotiators were thinking of nation-states when they wrote it. The language they chose applies equally to arthropods.

The beetle does not dispute this analysis. It does not raise an affirmative defense. It does not assert its Second Amendment rights, which, under District of Columbia v. Heller (2008), extend to “the people” and have not been construed to include the Insecta.²⁸ It detonates its chemical weapons when approached, which is the behavioral equivalent of entering a guilty plea while simultaneously committing the offense.

X. Conclusion

The National Firearms Act defines a destructive device as any explosive, incendiary, or poison gas bomb, grenade, or similar device. The bombardier beetle operates a binary chemical weapon system that is explosive, incendiary, and produces a toxic chemical classified by OSHA as immediately dangerous to life at concentrations above 2 parts per million. It stores precursors in separate compartments, combines them with catalytic enzymes in a reinforced reaction chamber, and detonates the resulting mixture at 100°C in pulsed bursts exceeding 500 cycles per second through a directionally aimed turret. This is not a similar device. It is, by every operational parameter, the device itself.

Federal law requires a license to manufacture explosives. No bombardier beetle has obtained one. The Chemical Weapons Convention prohibits the production and stockpiling of binary chemical weapons. More than 500 species produce and stockpile them continuously. The Arms Export Control Act requires authorization for the international transfer of defense articles. Bombardier beetles cross international borders at will, carrying their weapons systems in their abdomens, without so much as a customs declaration.

The regulatory exposure is considerable. At a statutory maximum penalty of $10,000 per violation under 18 U.S.C. § 844(a), with each detonation constituting a separate offense, and with an estimated global bombardier beetle population numbering in the hundreds of millions, each of which may discharge its weapon system dozens of times per lifetime, the aggregate fine exceeds the GDP of most industrialized nations. The calculation is straightforward. The enforcement infrastructure to collect it does not exist.

The ATF maintains a toll-free tip line. It has received zero reports concerning unlicensed chemical weapons manufacturing by arthropods. The OPCW accepts declarations from member states regarding chemical weapons production facilities. No state has declared a rotting log. The United States Sentencing Guidelines provide for enhanced penalties when destructive devices are used during the commission of another crime. The bombardier beetle deploys its chemical weapons exclusively during encounters with other organisms, each of which constitutes an assault under any reasonable interpretation of the common law.

One hundred million years of continuous, unlicensed, unregulated chemical weapons manufacturing. Five hundred species. Every inhabited continent. Zero enforcement actions.

The beetle does not deny the allegations. It is too busy manufacturing explosives.

Ergo.