[JURIST] The US Supreme Court [official website; JURIST news archive] on Thursday ruled [opinion, PDF] 5-3 in Chamber of Commerce v. Whiting [Cornell LII backgrounder; JURIST report] that a controversial Arizona employment law [materials] is not preempted by the Immigration Reform and Control Act (IRCA) [text]. The law imposes penalties on businesses that hire illegal immigrants. Chief Justice Roberts delivered the first part of the opinion, joined by Justices Antonin Scalia, Clarence Thomas, Anthony Kennedy and Samuel Alito, upholding the…