Members of Congress are demanding answers after a St. Louis scholar's new book revealed details of secret Cold War-era U.S. government testing in which countless unsuspecting people, including many children, pregnant women and minorities, were fed, sprayed or injected with radiation and other dangerous materials. Lisa Martino-Taylor ... wrote Behind the Fog: How the U.S. Cold War Radiological Weapons Program Exposed Innocent Americans," [using] Freedom of Information Act requests to obtain previously unreleased documents, including Army records. She found that a small group of researchers, aided by leading academic institutions, worked to develop radiological weapons and later "combination weapons" using radioactive materials along with chemical or biological weapons. Martino-Taylor said the offensive radiological weapons program was a top priority for the government. Unknowing people in places throughout the U.S., as well as parts of England and Canada, were subjected to potentially deadly material through open-air spraying, ingestion and injection. "They targeted the most vulnerable in society," Martino-Taylor said. "They targeted children. They targeted pregnant women. People who were ill in hospitals. They targeted wards of the state. And they targeted minority populations." [House Democrat William Lacy] Clay said he was angered that Americans were used as "guinea pigs" for research. "I join with my colleagues to demand the whole truth about this testing," Clay said in a statement.