Apparently you have taken the position of Holder & Napalitono. You have no need to actually read the law.
AZ SB1070 Sec 11 C. "This act shall be implemented in a manner consistent with federal laws regulating immigration, protecting the civil rights of all persons and respecting the privileges and immunities of United States citizens."
So it is clear that the state is implementing Federal law in the enactment of this law. Some 70% of which is directed at employers.