Document 47: Department of State Cable from George P. Shultz to the Mission to the European Office of the United Nations and Other International Organizations. "U.N. Human Rights Commission: Item 12: Iranian Resolution on Use of Chemical Weapons by Iraq," March 14, 1984.
The State Department instructs the U.S. delegate to the United Nations to get the support of other Western missions for a motion of "no decision" regarding Iran's draft resolution condemning Iraq's use of chemical weapons. Failing that, the U.S. is to abstain on the resolution.
http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB82Twenty one years ago America was quite prepared to turn a blind eye to the Iraqi use of WMD against the Iranians and the Kurds. After Sadaam outlived his usefulness, America then wanted the UN to pass a similar resolution condemning the same WMD it would have abstained from 2 decades earlier