The Supreme Court has reached a decision in Arizona v. US.
Three of four provisions have been struck down, however, Section 2(B) of SB 1070, the part of the bill that allows local police officers to ask for immigration status after a crime, has been upheld. The Supreme Court has sent the remaining three provisions back to the Ninth Circuit. The Court ruled it was inappropriate for lower courts to strike down Section 2(B).
According to the Court opinion: