"You have evidence of pig-specific bacteria in surface waters, next to industrial swine operations," says Steve Wing, a researcher at the University of North Carolina.
Hanford workers described symptoms that include chronic headaches, respiratory problems and nerve damage.
Valerie Tarico is a psychologist. She is the author of 'Trusting Doubt: A Former Evangelical Looks at Old Beliefs in a New Light." She is also the founder of WisdomCommons.org.