Question: What month did the unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino-Japanese War got pardon?
Sentence (from "American cover-up of Japanese war crimes"): The American cover-up of Japanese war crimes occurred after the end of World War II, when the occupying US government granted political immunity to military personnel who had engaged in human experimentation and other crimes against humanity, predominantly in mainland China.
Relevant evidence: No