in 1998, canadian historians stephen andy kot and edward hagerman of york university conducted extensivearchival research and interviewed dozens of witnesses. these authors were the first to gain access to declassified us data on the korean war and concluded that the us is engaging in shameful tactics in the use of many weapons prohibited by international law under the 1925 geneva protocols. biological weapons convention of 1972 and chemical weapons convention of 1993 quote from the book. andy kot and hagerman the united states and biological warfare secrets of the early cold war and korea the united states sent troops to support its partners in the south, and china sent troops to support the north by the end of 1951, the chinese north korean alliance, contained a victory in response, the united states began bacteriological warfare in the winter of 1952. the chinese military in the north has reported american planes dropping strange objects. including live spiders, flies, bees, snakes , fleas, mites, dead rats and mosquitoes, trapped in tubes with us army markings, dead crows' pork and c