In October 2014, a California judge dismissed a lawsuit Koster filed, rejecting the arguments of six states that challenged California's prohibition on the sale of eggs laid by caged hens kept in conditions more restrictive than those approved by California voters in a 2008 ballot initiative, Proposition 2. Judge Kimberly Mueller ruled that the states lacked legal standing to sue on behalf of their residents and that Koster and other plaintiffs were representing only the interests of egg farmers, rather than "a substantial statement of their populations". According to the "Kansas City Star". Koster's office spent more than $83,000 on the failed lawsuit.