The United States built one of the safest food supplies on Earth, yet a single field can still sicken thousands of people across dozens of states. Starting at the edge of the Salinas Valley, where much of the nation's salad is grown, the episode asks how a supply once thick with chalk, formaldehyde and embalmed beef became safe, and why failures now grow bigger and more national.
Whether food is safer or riskier is answered as both: safer on average, with larger national failures. How much the rise in big multistate outbreaks reflects real change versus better detection through whole-genome sequencing is also unsettled.