Arizona's law giving local police immigration enforcement powers is likely to be struck down, most legal experts predict. But they note one large uncertainty: The current Supreme Court has not ruled directly on such a state-federal clash over immigration. "This is an unsettled area of constitutional jurisprudence. The last major pronouncement on the question was against a completely different landscape," said Peter Spiro, a professor at Temple's Beasley School of Law. The justices "may be willing to cut [states] some slack in the face of Washington's now persistent failure to deal with immigration reform."