Here´s McPaper on the fact that Kennedy´s opinion in Lawrence actually referred to a foreign court:
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Never before had the Supreme Court's majority cited a foreign legal precedent in such a big case.
Ah, but they´ve done it in not-so-big cases?
As Jack Balkin explains, this is nothing new or important. The previous Bowers decision had referred to a general concept of "Western Values," so actually providing some context with respect to what constitutes these values isn´t exactly radical.
Bonus points for anyone who goes through Scalia´s judicial opinions and find any references to furriners.