I did a google search and found that we have, in fact, ratified it. My apologies; I figured that since we have refused to ratify the
Convention on the Elimination of All Forms of Discrimination against Women (we are the
only country to have signed but not ratified this) and the
Convention on the Rights of the Child (Somalia is the only other country recognized by the United Nations not to have ratified this one), we had also refused to ratify the
Convention on the Prevention and Punishment of the Crime of Genocide. My bad.
You can find a whole page of international laws, conventions and treaties that fall within the purview of the Office of the United Nations High Commissioner for Human Rights at
http://www.ohchr.org/english/law/ It is quite eye-opening to browse through and see just how many of these conventions the United States has signed (meaning we have dipolmatically agreed with the contents) but ratified decades latter (meaning we have given the convention the force of law) or never ratified at all. The
International Covenant on Civil and Political Rights, for example, was proposed in December of 1966, entered in to force in March 76,
was signed by the United States in October 1977 and ratified by the Senate in June, 1992. Note that Iraq signed in Feb. 69 and ratified in Jan. 71.