Our Wacky Wednesday broadcast on EWTN Radio has received several questions lately about a belief that the government may be intentionally spraying biological agents through the contrails commonly emitted by aircraft during flight. Is there any evidence to support this theory?As of this writing, there is no credible evidence that the government is using aircraft to spray chemicals over the population.
The idea that there are dangerous chemicals in the white lines of vapor that trail after aircraft has been around for decades. As CNN reports, it began in the US in the late 1990s with an Air Force research paper entitled, “Weather as a Force Multiplier: Owning the Weather in 2025” that outlines “future weather modification systems to achieve military objectives” using “aerospace forces.” The Environmental Protection Agency clearly stated that the paper “does not reflect current military policy, practice, or capability.”
However, the idea of chemtrails is not far-fetched by any means. The British government conducted hundreds of mock chemical warfare attacks on the general public during the Cold War.
“This subjected hundreds of thousands of people to zinc cadmium sulfide, a chemical chosen due to its small size — it’s similar to that of germs — and because it glows under ultraviolet light, making it easy to trace,” CNN reports. “The chemical was thought to be nontoxic at the time, though repeated exposure could be cancerous. The US did the same in the 1950s and 1960s — using the chemical as a tracer to test the dispersion of biological weapons.”
Even though the EPA has issued detailed information on contrails in an effort to dispel these theories, they persist, mainly on social media where normal contrail patterns such as grids or spreading trails are misrepresented as evidence of spraying.
The most common example of these distortions refers to tic tac patterns in contrails that believers say is proof that some kind of organized spraying is occurring. However, the science tells us they are caused by crisscrossing jet trails that create a tic-tac-toe pattern when multiple aircraft pass over one another in humid air. These condensation trails are frozen water vapor that are often seen in eight-mile-wide air corridors. High-altitude humidity causes the vapors to linger for hours.
Many theorists point to the fact that several states have passed laws intending to ban any kind of weather modification and/or solar geo-engineering which they say proves that chemtrails exist.
However, a review of bills that have passed in various states such as Tennessee, Florida, Montana, and South Carolina are preemptive rather than reactive and are concerned with banning the intentional release of airborne chemicals for weather modification in the future.
Alabama’s law, House Bill 25, aims to prohibit the “dispersion of compounds or substances” into the atmosphere for the purpose of affecting the weather or sunlight and makes weather modification a Class B misdemeanor with potential fines of up to $100,000. The bill has not yet been passed. An earlier version, introduced in 2025, failed to pass.
There are many reasons why people persist in these theories.
Holly Jean Buck, a Radcliffe-Salata Climate Justice Fellow and associate professor of environment and sustainability at the University of Buffalo, believes that the conspiracy comes from fear about technology and environmental change, loss of agency, and lack of trust in elites.
“This fear is rooted in real things. Our personal and consumer data are vacuumed up and used to manipulate us — this is the business model of some the world’s highest-value companies. The platforms we spend hours on each day have been designed to maximize engagement in ways that can harm our health and the health of our children. While pollution has fallen over the last several decades, there are still areas in which it is not adequately regulated. Our governments are failing to meaningfully address climate change.”
She adds: “So when elites like Lauren Sánchez and Jeff Bezos show up in Cannes on a carbon-spewing megayacht to accept a climate change award, some people conclude that climate action is an elite plot. The core of their fears is understandable — it’s the details that are wrong.”
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