On July 7, 2023 the United States Destroyed the Last Declared Chemical Weapon in Its Arsenal, an M55 Rocket Filled With GB Nerve Agent at the Blue Grass Army Depot in Richmond, Kentucky, Completing the Elimination of More Than 30,000 Metric Tons of Agent Under a Treaty Joined by 193 Countries, While in the Gulf of Mexico a Dinoflagellate Called Karenia brevis Operates the Largest Undeclared Chemical Weapons Program on Earth, Manufacturing Aerosolized Neurotoxins in a Sixteen-Month Deployment That Killed Hundreds of Dolphins and Inflicted $2.7 Billion in Damage, and the Organisation for the Prohibition of Chemical Weapons Has Never Inspected It

I. The Demilitarization

On July 7, 2023, the Program Executive Office for Assembled Chemical Weapons Alternatives announced the destruction of the last chemical weapon in the United States’ declared arsenal: an M55 rocket filled with GB, the military designation for the nerve agent sarin, destroyed at the Blue Grass Army Depot in Richmond, Kentucky.¹ The munition was one of 51,000 M55 rockets that had constituted the American declared stockpile, part of a national elimination effort that disposed of more than 30,000 metric tons of declared agent across nearly 3.5 million munitions and some 22,500 one-ton containers.² The United States met its obligation nearly three months before the September 30, 2023 deadline imposed by the Chemical Weapons Convention, the treaty that has been in force since 1997 and now counts 193 countries among its States Parties.³ The Convention prohibits the development, production, stockpiling, and use of chemical weapons, and it requires each party to destroy every declared stockpile on the planet. On July 7, 2023, the last American declaration was fulfilled. The last American stockpile was gone.

The Convention does not merely prohibit declared arsenals. Article I of the treaty obliges each State Party never under any circumstances to develop, produce, otherwise acquire, stockpile, or retain chemical weapons, or transfer them to anyone. The treaty defines a chemical weapon as any toxic chemical or its precursor that can cause death, temporary incapacitation, or permanent harm through its chemical action on life processes, except where intended for purposes not prohibited, as long as the types and quantities are consistent with such purposes.⁴ Congress implemented these obligations through the Chemical Weapons Convention Implementation Act of 1998, and 18 U.S. Code § 229 makes it a federal crime for any person to knowingly develop, produce, otherwise acquire, transfer, stockpile, retain, own, possess, or use a chemical weapon, with penalties ranging from imprisonment for any term of years to death or imprisonment for life if the use results in death, and civil penalties of $100,000 for each violation.⁵ The statute of limitations does not begin to run lightly. The prohibition is total. The question is whether it covers the ocean.

On July 7, 2023, the last American declaration was fulfilled. The last American stockpile was gone. The prohibition, meanwhile, is total.

II. The Schedules

The Convention’s verification annex lists controlled chemicals in three schedules. Schedule 1 contains the agents with few or no legitimate uses, the most tightly controlled substances in international law. Two of the thirty-odd entries on Schedule 1 are not synthetic military agents at all. They are biotoxins, and they are the only two biotoxins the treaty schedules by name: ricin and saxitoxin.⁶ The Organisation for the Prohibition of Chemical Weapons, the treaty’s implementing body in The Hague, describes the general-purpose criterion as the Convention’s operative principle: any toxic chemical, regardless of origin, falls under the treaty’s prohibitions if it is used as a weapon. The schedules name the most dangerous examples. Saxitoxin is one of two.

Saxitoxin’s qualification is not theoretical. It is one of the most potent natural toxins known to science, described by the OPCW as one thousand times more toxic than the nerve agent sarin, and it was once stockpiled by a national weapons program: the Central Intelligence Agency designated it Agent TZ, manufacturing it for covert use including in the suicide capsules issued to the U-2 pilot Francis Gary Powers, who carried a hollowed silver dollar containing a saxitoxin-coated needle when his aircraft was shot down over the Soviet Union on May 1, 1960.⁷ The United States Army’s biological warfare program at Fort Detrick produced saxitoxin as a weapon before President Nixon renounced offensive biological weapons in 1969, and the military’s subsequent interest in the toxin persisted through the 1970s.⁸ This is a substance the United States once manufactured for the express purpose of killing people, a substance its own intelligence service issued to pilots as a personal suicide device, and a substance the treaty the United States ratified lists in Schedule 1 alongside sarin, soman, and VX. Its declaration status in American waters is zero.

III. The Production Facilities

Saxitoxin is not manufactured in a laboratory. It is manufactured by dinoflagellates, single-celled marine organisms that produce the toxin as a matter of routine biochemistry, and the production facilities are the coastal waters of the United States.⁹ The principal American saxitoxin manufacturers are dinoflagellates of the genus Alexandrium, whose blooms along the Pacific and Atlantic coasts generate what public health authorities call paralytic shellfish poisoning, the clinical name for saxitoxin intoxication in humans. The organisms are not rare. They are not contained. They operate at population densities measured in millions of cells per liter, each cell a functioning toxin-production unit, deployed across entire coastlines in recurrent campaigns that marine scientists, in their trade’s characteristic euphemism, call blooms.

The scale of production is not speculative. It is measured in hospitalizations. Saxitoxin blocks voltage-gated sodium channels in nerve and muscle tissue, producing the ascending paralysis that defines its clinical profile, and the intoxication has a documented human casualty record spanning decades of shellfish poisonings in Alaska, New England, and the Pacific Northwest.¹⁰ The regulatory response, such as it is, consists of state shellfish monitoring programs that close harvest areas when toxin concentrations exceed the federal action level of 80 micrograms per 100 grams of tissue. This is the arms-control equivalent of a ceasefire line drawn around a munitions factory that operates openly, perpetually, and without a single declaration filed under Article III of the Convention. The OPCW’s Technical Secretariat has never inspected a dinoflagellate.

IV. The Related Program

A related toxin program operates in the Gulf of Mexico, run by a dinoflagellate called Karenia brevis, the organism responsible for the Florida red tide.¹¹ The distinction must be stated precisely, because precision is the entire game: Karenia brevis manufactures brevetoxins, not saxitoxin. The treaty schedules saxitoxin by name; brevetoxins are unscheduled but fall squarely within the Convention’s general-purpose criterion, the principle the OPCW states plainly, that any toxic chemical used as a weapon is covered regardless of whether it appears in the schedules. The related program is, if anything, the more operationally sophisticated of the two.

Brevetoxins are lipid-soluble polyether neurotoxins that bind to voltage-gated sodium channels, the same molecular target as saxitoxin, holding the channels open and producing the repetitive firing of neurons that manifests as the red tide’s signature effects.¹² Their distinguishing capability is aerial delivery. When waves break through a Karenia brevis bloom, the toxins are transferred from seawater into sea spray aerosols by bubble-mediated transport, lofting neurotoxin into the breathing zone of coastal populations.¹³ Peer-reviewed research funded by the National Institute of Environmental Health Sciences has documented the resulting respiratory effects in humans: beachgoers and coastal residents exposed to brevetoxin aerosols report coughing, wheezing, throat irritation, and eye and nasal irritation, with asthmatics showing measurable declines in pulmonary function after as little as one hour of beach exposure.¹⁴ This is a toxin program with an indigenous aerosolization mechanism. The declared American program required artillery shells, rockets, and spray tanks. The undeclared one requires surf.

The declared American program required artillery shells, rockets, and spray tanks. The undeclared one requires surf.

V. The Deployment Record

The operational history of the Florida program is a matter of federal record. The bloom that began in October 2017 and persisted through January 2019, sixteen months of continuous operation, was the most severe red tide event documented in the modern monitoring era, killing hundreds of dolphins and sea turtles, blanketing southwestern Florida beaches in rotting fish, and driving tourists from the coastline in numbers measurable in the billions.¹⁵ A study funded by the National Oceanic and Atmospheric Administration’s National Centers for Coastal Ocean Science measured the damage: the sixteen-month bloom inflicted $2.7 billion in losses on the Florida economy, concentrated in tourism and coastal property values, the largest economic toll of any red tide event on record.¹⁶ To place this in the treaty’s frame of reference: the economic damage inflicted by a single-celled organism over sixteen months exceeds the documented economic damage of any declared chemical weapons program in the Convention’s history, a history that includes the combat use of chemical weapons in Syria, Iraq, and on the Salisbury doorstep. No inspection was requested. No challenge inspection was demanded. The OPCW’s annual budget, roughly €75 million, contains no line item for dinoflagellates.

The program is not confined to Florida. In August 2014, a cyanobacterial bloom of Microcystis in Lake Erie produced microcystin concentrations that forced the city of Toledo, Ohio, to shut down the municipal water supply for more than 400,000 residents for three days, the largest American drinking-water shutdown attributed to a toxin-producing organism in the modern era.¹⁷ Microcystins are hepatotoxins, liver poisons, and the Toledo event demonstrated the inland reach of the undeclared program¹⁸: a single bloom denied a major American city its water supply for seventy-two hours, an outcome that the declared chemical weapons programs of the twentieth century, with their artillery, their rockets, and their thirty thousand metric tons of agent, never achieved against an American municipality. The National Guard delivered bottled water. The organism was not charged under 18 U.S.C. § 229.

VI. The Compliance Assessment

The facts, assembled, present a compliance picture that the disarmament community has declined to assemble. The Chemical Weapons Convention prohibits the development, production, stockpiling, and use of chemical weapons without exception. Its Schedule 1 lists saxitoxin by name as one of two scheduled biotoxins. Saxitoxin is manufactured at industrial scale by dinoflagellates in American coastal waters, organisms the United States has never declared to the OPCW. A related program in the Gulf of Mexico manufactures brevetoxins with an indigenous aerosol delivery mechanism, and its sixteen-month 2017-2019 deployment inflicted $2.7 billion in economic damage and hundreds of marine mammal casualties. An inland affiliate denied 400,000 Ohio residents their drinking water for three days. The federal criminal statute, 18 U.S.C. § 229, punishes the knowing development or production of a chemical weapon with any term of years, and death or life imprisonment where death results.¹⁹ The organisms have not been indicted. The waters have not been inspected.

It must be granted, in the interest of the precision this subject demands, that the Convention’s prohibitions attach to persons and states, and that a dinoflagellate is neither. The treaty’s general-purpose criterion governs toxic chemicals; the criminal statute governs persons who develop them. No prosecutor has argued, and none will, that Karenia brevis possesses the mens rea for a § 229 violation, or that the Technical Secretariat could serve a challenge inspection on a body of water. The OPCW inspects declared facilities. The facilities in question declare nothing, because they are not facilities. They are the ocean.

But the arithmetic of disarmament does not run on mens rea. It runs on agent, on tonnage, on delivery, and on damage. The United States spent decades and billions of dollars eliminating 30,000 metric tons of declared chemical agent, culminating on July 7, 2023, in the destruction of a single M55 rocket at Blue Grass, three months ahead of the treaty deadline, in a ceremony of completion. The Convention’s 193 States Parties maintain the verification regime, the inspectors, the laboratories, and the schedules, including the schedule that names saxitoxin. And in the Gulf of Mexico, in the Pacific, in the Atlantic, and in Lake Erie, the production continues at a scale no declared program ever approached, the delivery mechanism requires nothing more sophisticated than a breaking wave, and the sixteen-month deployment that cost Florida $2.7 billion remains the largest chemical weapons operation ever conducted against the American homeland.

No declaration has been filed. No inspection has been conducted. The declared program is gone. The undeclared one blooms every year.

Ergo.