The U.S. Supreme Court on Monday rejected the latest challenge to California’s ban on foie gras, a delicacy produced from the enlarged livers of ducks and geese that have been force-fed corn.

The court declined to hear an appeal by producers of foie gras.

In doing so, the high court left intact a 2017 ruling by the San Francisco-based 9th U.S. Circuit Court of Appeals upholding the law. Animal rights groups contend that the force-feeding process is painful, gruesome and inhumane.