By Stephanie Armour, KFF Health News

While plowing a wheat field in rural Washington state in the 1990s, William Wallace spotted a gray plane overhead that he believed was releasing chemicals to make him sick. The rancher began to suspect that all white vapor trails from aircraft might be dangerous.

He shared his concern with reporters, acknowledging it sounded a little like “The X Files,” a science fiction television show.

Academics cite Wallace’s story as one of the catalysts behind a fringe concept that has spread among adherents to the Make America Healthy Again, or MAHA, movement and is gaining traction at the highest levels of the federal government. Its treatment as a serious issue underscores that under President Donald Trump, unscientific ideas have unusual power to take ho

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