Sosa, Customary International Law, and the Continuing Relevance of Erie

62 Pages Posted: 18 Aug 2006

See all articles by Curtis Bradley

Curtis Bradley

Duke University School of Law

Jack Landman Goldsmith

Harvard Law School

David H. Moore

Brigham Young University - J. Reuben Clark Law School

Abstract

Ten years ago, the conventional wisdom among international law academics was that customary international law (CIL) had the status of self-executing federal common law to be applied by courts without any need for political branch authorization. This "modern position" came under attack by so-called "revisionist" critics who argued that CIL had the status of federal common law only in the relatively rare situations in which the Constitution or political branches authorized courts to treat it as such. Modern position proponents are now claiming that the Supreme Court's 2004 decision in Sosa v. Alvarez-Machain confirms that CIL has the status of self-executing federal common law. As this Article explains, the decision in Sosa did not in fact embrace the modern position, and, indeed, is best read as rejecting it. Commentators who construe Sosa as embracing the modern position have confounded the automatic incorporation of CIL as domestic federal law in the absence of political branch authorization (i.e., the modern position) with the entirely different issue of whether and to what extent a particular statute, the Alien Tort Statute ("ATS"), authorizes courts to apply CIL as domestic federal law. The Article also explains how CIL continues to be relevant to domestic federal common law despite Sosa's rejection of the modern position. The fundamental flaw of the modern position is that it ignores the justifications for, and limitations on, post-Erie federal common law. As the Article shows, however, there are a number of contexts in addition to the ATS in which it is appropriate for courts to develop federal common law by reference to CIL, including certain jurisdictional contexts not amenable to state regulation (namely admiralty and interstate disputes), and gap-filling and interpretation of foreign affairs statutes and treaties. The Article concludes by considering several areas of likely debate during the next decade concerning the domestic status of CIL: corporate aiding and abetting liability under the ATS; application of CIL to the war on terrorism; and the use of foreign and international materials in constitutional interpretation.

Keywords: customary international law, federal common law, alien tort statute

Suggested Citation

Bradley, Curtis and Goldsmith, Jack Landman and Moore, David H., Sosa, Customary International Law, and the Continuing Relevance of Erie. Harvard Law Review, Vol. 120, 2007, Duke Law School Legal Studies Paper No. 114, Available at SSRN: https://ssrn.com/abstract=924987

Curtis Bradley (Contact Author)

Duke University School of Law ( email )

210 Science Drive
Box 90362
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United States

Jack Landman Goldsmith

Harvard Law School ( email )

1575 Massachusetts
Hauser 406
Cambridge, MA 02138
United States

David H. Moore

Brigham Young University - J. Reuben Clark Law School ( email )

430 JRCB
Brigham Young University
Provo, UT 84602
United States
801-422-8549 (Phone)
801-422-0391 (Fax)

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