On March 6, 2014, Pruitt joined a lawsuit targeting California's prohibition on the sale of eggs laid by caged hens kept in conditions more restrictive than those approved by California voters. Less than a week later, Pruitt announced that he would investigate the Humane Society of the United States, one of the principal proponents of the California law. In October 2014, a California judge dismissed the lawsuit, rejecting the arguments of Pruitt and the other attorneys-general concerning California's Proposition 2, a 2008 ballot initiative. Judge Kimberly Mueller ruled that Oklahoma and the other states lacked legal standing to sue on behalf of their residents and that Pruitt and other plaintiffs were representing the interests of egg farmers, rather than "a substantial statement of their populations."