High court strikes down key parts of Arizona immigration law Yuri Gripas / Reuters Members of the media gather June 25 for a stakeout in front of U.S. Supreme Court in Washington. The Supreme Court on Monday struck down key parts of the tough anti-illegal immigration law enacted by Arizona in 2010. The Supreme Court has handed down a ruling on Arizona's strict immigration law. The law had made it a crime for non-citizens who are unlawfully present in the United States to work in Arizona and requires police officers to check the immigration status of any person whom they have probable cause to believe is an illegal immigrant. Text of the decision (PDF) The decision was a victory for President Obama who had criticized the law, saying it "threatened to undermine basic notions of fairness that we cherish as Americans." The Justice Department moved quickly in 2010 to block enforcement of the law.