On Monday, the Supreme Court in Arizona v. United States struck down three provisions of Arizona’s S.B. 1070 racial profiling law, but reinstated, for now, the most controversial provision, which requires Arizona police officers to demand the immigration papers of anyone they stop, arrest, or detain. S.B. 1070 makes racial profiling Arizona state policy. When a police officer asks for papers, it’s based on bias because there is no way to tell by looking at or listening to someone whether the person is lawfully in the United States.