Oral arguments in USA v. State of Arizona, Case No. 10-16645, will be
heard by a panel of three judges of the United States Court of Appeals for the Ninth Circuit on
Monday, November 1, 2010, beginning at 9 a.m. (Pacific time) and will be shown in the Law Library Reference Lounge on the 2nd Floor.

The case 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
enactment 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.

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