Last December, the attorney general of Oklahoma issued an advisory opinion stating that, due to recent U.S. Supreme Court decisions, the state could no longer prohibit faith-based groups from operating charter schools. Catholic leaders seized the opportunity and applied to do just that; the state’s virtual charter board may vote on their application as early as next week. We should expect a [SCOTUS] opinion ruling that states aren’t obligated to allow charter schools, but once they do, they can’t single out faith-based groups for exclusion.