Note: in the print edition of this issue, this article appears as a sidebar to another news article, “Cold War toxin seeps into Western water.” Ammonium perchlorate shows up in hundreds of military ...

INTERCEPTING TOXINS: Kerr-McGee employee relations manager Ron Cady stands at a water-treatment plant near Las Vegas Wash in Henderson, Nevada, where perchlorate concentrations in groundwater were 60 ...

Editor's Note: A previous version of this story incorrectly stated that the list of foods contained the highest concentration of perchlorate but these foods were just tested for the presence of ...

A key ingredient in rocket fuel and fireworks was found in fast food and grocery products, most concerningly baby food and fresh fruits and vegetables. Shutterstock A key ingredient in rocket fuel can ...