An Arizona law that punishes employers who knowingly hire immigrants without documents will be put to the test Wednesday. The outcome also could signal how the court would handle the controversial Arizona immigration enforcement law, SB1070, key components of which were blocked by a federal judge this summer. "If the Arizona statute is struck down on pre-emption grounds, it's very hard to imagine SB1070 surviving," said Peter Spiro, an immigration law expert at Temple's Beasley School of Law.