Ruth Bader Ginsberg was recently criticized by the right wing for using foreign precedents. Oddly enough, Scalia was one of those criticizing her. But apparently he believes that this should be left to the judiciary to decide, not Congress.
http://en.wikipedia.org/wiki/Ruth_Bader_GinsburgOn March 1, 2005, in the case of Roper v. Simmons, the Supreme Court (in an opinion written by Justice Anthony Kennedy) ruled in a 5-4 decision that the Constitution forbids executing convicts who committed their crimes before turning 18. In addition to the fact that most states now prohibit executions in such cases, the majority opinion reasoned that the United States was increasingly out of step with the world by allowing minors to be executed, saying "the United States now stands alone in a world that has turned its face against the juvenile death penalty."
Justice Antonin Scalia rejected that approach with strident criticism, saying that the justices' personal opinions and the opinions of "like-minded foreigners" should not be given a role in helping interpret the Constitution.
Ginsburg rejected that argument in a speech given about one month after Roper. "Judges in the United States are free to consult all manner of commentary," she said to several hundred lawyers, scholars, and other members of the American Society of International Law.<3> She cited several instances when the logic of foreign courts had helped untangle legal questions domestically, and of legislatures and courts abroad adopting U.S. law in return. Fears about relying too heavily on world opinion "should not lead us to abandon the effort to learn what we can from the experience and good thinking foreign sources may convey," Ginsburg told the audience.
In response to Roper and other recent decisions, several Republicans in the U.S. House of Representatives introduced a resolution declaring that the "meaning of the Constitution of the United States should not be based on judgments, laws, or pronouncements of foreign institutions unless such foreign judgments, laws or pronouncements inform an understanding of the original meaning of the Constitution of the United States." A similar resolution was introduced in the U.S. Senate. In her speech, Ginsburg criticized the resolutions. "Although I doubt the resolutions will pass this Congress, it is disquieting that they have attracted sizable support," she said. "The notion that it is improper to look beyond the borders of the United States in grappling with hard questions has a certain kinship to the view that the U.S. Constitution is a document essentially frozen in time as of the date of its ratification," Ginsburg asserted. "Even more so today, the United States is subject to the scrutiny of a candid world," she said. "What the United States does, for good or for ill, continues to be watched by the international community, in particular by organizations concerned with the advancement of the rule of law and respect for human dignity."