English: USA v. State of Arizona involves the constitutionality of Arizona Senate Bill 1070, which requires state law enforcement officers to check a person's immigration status under certain circumstances, and authorizes a warrantless arrest where there is probable cause to believe that the person has committed an offense making him/her removable from the United States.
The U.S. government, arguing that SB 1070 was preempted by federal statutes, sought a preliminary injunction to block enforcement of the law. The preliminary injunction was granted in part and denied in part by the U.S. District Court for the District of Arizona. The State of Arizona and its governor have appealed, seeking to remove the injunction imposed by the district court on certain portions of SB 1070. Other provisions of the law not subject to the injunction went into effect July 29, 2010.
This case was argued before a three judge panel of the United States Court of Appeals for the 9th Circuit on November 1, 2010 in Courtroom One of the James R. Browning Federal Courthouse in San Francisco, California.