I recently read about Shirō Ishii, a Japaneese microbiologist (https://en.wikipedia.org/wiki/Shirō_Ishii https://en.wikipedia.org/wiki/Shirō_Ishii) who conducte

I recently read about Shirō Ishii, a Japaneese microbiologist (https://en.wikipedia.org/wiki/Shirō_Ishii https://en.wikipedia.org/wiki/Shirō_Ishii) who conducted human experiments during World War-II which resulted in death of close to 10000 humans. More interestingly he was given immunity from war crimes in exchange for full disclosure about his experiments. And the information he provided was deemed invaluable. From the wiki it (experiment information) "could never have been obtained in the United States because of scruples attached to experiments on humans," and "the information was obtained fairly cheaply."