The Puerto Rico Radiation Experiments

The folder at the back of the third drawer—the one my mother labeled GOVERNMENT SECRETS—clings to its neighbors as if the paper itself has become static. The tab is labeled “1931: The Puerto Rico Radiation Experiments,” but the contents inside have nothing to do with radiation. Instead, they detail a different kind of clinical horror, one preserved in the carbon copies of official inquiries and a single, devastating piece of correspondence.

In November 1931, Dr. Cornelius P. Rhoads, a pathologist affiliated with the prestigious Rockefeller Institute for Medical Research, was conducting medical research in Puerto Rico. During his tenure on the island, Rhoads penned a private letter that would later ignite an international scandal. In this document, Rhoads expressed virulent, deeply racist contempt for the local Puerto Rican population, writing that he had actively sought to exterminate them, including a claim that he had intentionally injected cancer cells into his patients.

The letter was never meant for public eyes, but an unnamed local laboratory assistant discovered it among Rhoads’s papers. The assistant passed the document to Pedro Albizu Campos, the leader of the Puerto Rican Nationalist Party. Campos seized upon the letter as a stark, undeniable symbol of colonial exploitation and medical abuse, publicizing its contents to the media—a political and social fallout that historians would later refer to as the “Porto Ricochet.”

The ensuing public outrage forced Puerto Rican authorities to launch an official investigation in the 1930s. Faced with the consequences of his words, Rhoads deployed what would become known as his “joke” defense, characterizing the horrific claims in his letter as a piece of dark, parodic humor written for his own amusement. While the scandal remains a foundational case study in the history of medical ethics and the colonial dynamics of American clinical research, subsequent investigations found no clinical evidence to confirm that Rhoads actually performed the lethal injections he claimed. The physical reality of the experiments remains unproven, leaving the letter as either a confession of attempted mass murder or a monstrous rhetorical fabrication.

In the margin of the official 1932 senate inquiry transcript, my mother wrote a single question: If a man confesses to a shadow, does the shadow become the body? Beside it, she had sketched a small, perfect circle, bisected by a needle. She had also clipped a newspaper photo of Rhoads from his later years, looking distinguished and entirely untouched by the “Porto Ricochet.”

It is 02:48. The silence in the study is absolute, save for a faint, rhythmic tapping sound from inside the desk—a rapid, dry clacking like a typewriter carriage returning, though my mother’s old Smith Corona sits covered and dead in the corner. When I lay my hand flat against the wood, the vibration stops, but my fingers come away slick with condensation. The air in this corner has grown so cold that I can feel the chill radiating from the floorboards.

I am sending this to Lukas over the line. If it only exists here, it doesn’t exist.

>>> BEGIN CAPTURE
FILE GOVT_SECRETS/1931/PUE-121
SUBJECT: Dr. Rhoads and the Porto Ricochet
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november 1931. Dr. Rhoads conducts research in Puerto Rico.
affiliated with Rockefeller Institute for Medical Research.
Rhoads writes private letter expressing contempt for locals.
claims he actively sought to exterminate them.
claims he intentionally injected cancer cells into patients.
unnamed local lab assistant discovers document.
assistant passes letter to Pedro Albizu Campos.
Campos, Nationalist Party leader, publicizes it.
fallout termed the "Porto Ricochet" by historians.
official investigation launched by authorities in 1930s.
Rhoads uses "joke" defense, claiming parodic humor.
investigations find no clinical evidence of actual injections.
physical reality of experiments remains unproven.
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M. NOTE: If a man confesses to a shadow, does the shadow become the
body?
>>> END CAPTURE