Avena Mexico v. United States of America

Mexico v. United States of America, formally Avena and Other Mexican Nationals, was a case before the International Court of Justice (ICJ) decided on 31 March 2004, finding that the United States had breached its obligations under the Vienna Convention on Consular Relations in not allowing representation from Mexico to meet with Mexican citizens arrested and imprisoned for crimes in the United States. An order indicating provisional measures in the case of Mr. José Ernesto Medellín Rojas was entered on 16 July 2008, and on 19 January 2009 the ICJ found that the United States breached its obligations under the 16 July order, but also that the Statute of the International Court of Justice "does not allow it to consider possible violations of the Judgment which it is called upon to interpret."

Source: http://en.wikipedia.org/wiki/Mexico_v._United_States_of_America