The Ten Commandments appear in multiple locations on the U.S. Supreme Court building, they are our foundation.
http://www.supremecourt.gov/about/symbolsoflaw.pdf
Until recently moving to the Oklahoma Judicial Center (a renovated, re-purposed building) the Oklahoma Supreme Court was housed in the Oklahoma state capitol and, I believe, still has courtrooms in that building. Why shouldn’t the Ten Commandments be on the Capitol grounds?
Oklahoma state property is not being used to further religions, rather is is being used to acknowledge the foundation of our society and jurisprudence. Does the Oklahoma court reject those foundations? If so, what foundations have they substituted?
According to that link, Confucius and Muhammad also appear on the U.S. Supreme Court building, along with Moses. Is sounds like the Ten Commandments are only depicted as the numerals I to X.