which the United States ratified in 1994". "The Convention against Racial Discrimination requires the federal and all state and local governments to ensure that their immigration policies do not have the effect of discriminating against persons on the basis of race, color, descent, or national or ethnic origin. This includes ensuring that non-citizens enjoy equal protection and recognition before the law. The US government is prohibited from engaging in acts or the practice of racial discrimination against persons or groups of persons and must "ensure that all public authorities and public institutions, national and local, shall act in conformity with this obligation."
Is Arizona now formally opting out of this treaty?
http://www.hrw.org/en/news/2010/04/30/us-arizona-violating-human-rights-treaty