The United States Supreme Court has declined to hear a challenge to California's Proposition 2 law that was filed by six other states. The law, which took effect in 2015, requires that eggs produced and sold in the state are laid by hens that have adequate room to stand up, sit down, turn around and extend their limbs without touching another bird or the sides of the cage.The recent challenge to California’s law was led by Missouri Attorney General Josh Hawley, who stated he believed the law imposes onerous new regulations on Missouri poultry farmers and would drive up the cost of eggs for Missouri consumers.Alabama, Iowa, Kentucky, Nebraska and Oklahoma joined in the appeal.The law had been legally challenged by other states before. Hawley’s predecessor, Chris Koster, in 2014, filed a lawsuit that challenged the California egg law, months before it was to be enacted. The suit was filed in the U.S. District Court in Fresno, California. That challenge also involved the other five states.