Since the direct link I gave does not appear to work properly you may find the exerpt above in Federal Register April 3, 2008 Vol 73 No 65 (Rules and Regulations)
http://www.gpoaccess.gov/fr/Index.html regarding new Homeland Security rules for
Quote:
Documents Required for Travelers Departing From or Arriving in
the United States at Sea and Land Ports-of-Entry From Within the Western Hemisphere
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Also observe they have made the following determination as well
Quote:
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\1\ ``U.S. citizens'' as used in this rule refers to both U.S. citizens and U.S. non-citizen nationals.
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This appears to exclude "non-U.S. nationals" from any of the requirements.