Neither the Supreme Court of the United States nor any lower Federal court shall, in the purported exercise of judicial power to interpret and apply the Constitution of the United States, employ the constitution, laws, administrative rules, executive orders, directives, policies, or judicial decisions of any international organization or foreign state, except for the English constitutional and common law or other sources of law relied upon by the Framers of the Constitution of the United States.
I got into an argument with somebody here about this very subject back awhile ago. They thought this idea was stupid.