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Syria. it is extremely deadly and cnns chris lawrence reminds us why the international community banned the use of these weapons. warning this report contains many graphic and disturbing images. >> reporter: describing this video as disturbing doesnt do it justice. but some attach a different word. proof. >> i have absolutely no doubt this was a chemical weapons attack. >> reporter: amy smithson is studying the use and affects of chemical weapons for years and it was the child in this video that...