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In page Unethical human experimentation in the United States:

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Researchers in the United States have performed thousands of human radiation experiments to determine the effects of ionizing radiation and radioactive contamination on the human body, generally on people who were poor, sick, or powerless.[1] Most of these tests were performed, funded, or supervised by the United States military, Atomic Energy Commission, or various other U.S. federal government agencies.[citation needed]