In a split decision this morning, the 9th Circuit Court of Appeals concluded there was sufficient evidence to believe that provisions of SB 1070 are an unconstitutional infringement on the exclusive power of the federal government to regulate immigration. Judge Richard Paez, writing for the majority, also said such a conclusion is supported by "the threat of 50 states layering their own immigration enforcement rules on top of the Immigration and Naturalization Act."
Los Angeles Times: Court upholds judge's ban on Arizona immigration law
The Washington Post: The 9th Circuit upholds stay on Arizona’s immigration law
Christian Science Monitor: Arizona may not enforce key parts of immigration law, court rules
The Guardian (United Kingdom): Arizona immigration law loses in court