Without comment the Supreme Court denied a writ of certiorari in a case brought by Missouri and twelve other states.  The plaintiffs contended that California Proposition #2 enacted in 2008 and the equivalent Massachusetts ballot initiative (2016 Prevention of Farm Animals Cruelty Act) placing restrictions on egg-producing states to conform to California and Massachusets housing and management requirements was a constitutional issue conflicting with the interstate commerce clause. 

In November 2018, the U.S. Solicitor General stated in a brief that the plaintiff states’ claim did not fall under the jurisdiction of the Supreme Court. 

The multistate case was supported by Protect the Harvest that advocates for low-income consumers of animal products and also by national livestock associations.