On November 4, 2010, Missouri Attorney General Chris Koster and 12 other state attorneys general filed an amici curiae brief before the US Supreme Court, supporting Arizona's Legal Arizona Workers Act (LAWA). The law imposes sanctions on employers that hire illegal immigrants. The case, Chamber of Commerce v. Whiting [PDF], challenged the law under federal preemption. The other states signing in support with Missouri were Alabama, Arkansas, Kansas, Louisiana, Michigan, Mississippi, Nebraska, North Dakota, South Carolina, Tennessee, Utah, and Virginia. In September 2008, the US Court of Appeals for the Ninth Circuit rejected a challenge to the bill. The US Supreme Court ultimately ruled 5-3 to uphold the law in May 2011.
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