Researchers investigating U.S. treaty questions often need to determine if an international agreement is self-executing or not. For treaties submitted to the Senate for advice and consent to ratification, you can use the declarations of advice and consent that appear in the “Congressional Record.” At the end of the declaration a note will appear if the treaty is self-executing. Hat tip to the Opinio Juris blog.
Here is an example from the September 23, 2008 Congressional Record. page S9330. http://thomas.loc.gov/cgi-bin/query/F?r110:37:./temp/~r110bzXCJP:e11421:
The Senate advises and consents to the ratification of the Protocol to the Treaty between the Government of the United States of America and the Government of the Republic of Hungary on Extradition signed December 1, 1994, as contemplated by Article 3 (2) of the Agreement on Extradition between the United States of America and the European Union, signed June 25, 2003, signed at Budapest on November 15, 2005 (Treaty Doc. 109-14), subject to the declaration of section 2.
Section 2. Declaration.
The advice and consent of the Senate under section 1 is subject to the following declaration:
This Treaty is self-executing.