That the cop must have a valid reason for making legal contact. This means the individual is already under investigation for another crime or the police has probable cause to stop the individual. Then if during questioning he has reason to believe that person's legal status in the country may not be what he represent then he can ask for the required documents that visitors and legal foreign residents are required, by federal law, to carry. U.S. citizens just need to show a driver's license, state issue id or a valid passport. Just like when starting a job. The governor also issued an executive order requiring classes and training to avoid any type of racial profiling. Now as to the real reason why this law was passed 1) Phoenix, the state capital, is the kidnapping capital of the nation because of the illegal immigration. 2) It is not safe to live any where near the border with Mexico. Just ask the people who live in border towns like Bisbee, Nogales or Douglas. Or even the family of the rancher that was killed simply because he was on his land when illegal immigrants were trespassing. 3) No fencing along the border with Mexico along with inadequate patrols and no anticipation of any improvements. Now someone will mention how our wonderful Secretary of DOH stated that the border is as secured as it ever was. Well Janet Napolitano used to be Governor of Arizona. Then when everything began falling apart like the state economy and the violence from Mexico spilling over into Arizona she was given a lifeboat out of the situation by Obama so she would not be stuck with any of the blame. The same Obama who has not provided any solutions so this law would not have even been considered let alone enacted.