Watch 731- How America Exploited Japan’s Biological Weapons Crimes, available on Amazon. Its focus is primarily on Japan’s use of bio weapons on Chinese victims, its dissection of live victims, and the immunity granted by the United States in exchange for the data obtained (something the U.S. government has admitted to) and the collaboration of the scientists in future crimes.
This film also looks at the U.S. use of bio weapons against North Koreans and Chinese. The U.S. has never admitted its guilt or apologized.