Arizona SB1070

The Support Our Law Enforcement and Safe Neighborhoods Act (introduced as Arizona Senate Bill 1070 and thus often referred to simply as Arizona SB 1070) is a 2010 legislative Act in the U.S. state of Arizona that at the time of passage in 2010 was the broadest and strictest anti-illegal immigration measure in a long time. It has received national and international attention and has spurred considerable controversy.

U.S. federal law requires all aliens over the age of 14 who remain in the United States for longer than 30 days to register with the U.S. government, and to have registration documents in their possession at all times; violation of this requirement is a federal misdemeanor crime. The Arizona act additionally made it a state misdemeanor crime for an alien to be in Arizona without carrying the required documents, required that state law enforcement officers attempt to determine an individual's immigration status during a "lawful stop, detention or arrest", when there is reasonable suspicion that the individual is an illegal immigrant. The law barred state or local officials or agencies from restricting enforcement of federal immigration laws, and imposed penalties on those sheltering, hiring and transporting unregistered aliens. The paragraph on intent in the legislation says it embodies an "attrition through enforcement" doctrine.

Critics of the legislation say it encourages racial profiling, while supporters say the law prohibits the use of race as the sole basis for investigating immigration status. The law was modified by Arizona House Bill 2162 within a week of its signing with the goal of addressing some of these concerns. There have been protests in opposition to the law in over 70 U.S. cities, including boycotts and calls for boycotts of Arizona. Polling has found the law to have majority support in Arizona and nationwide. Passage of the measure has prompted other states to consider adopting similar legislation.

The Act was signed into law by Governor Jan Brewer on April 23, 2010. It was scheduled to go into effect on July 29, 2010, ninety days after the end of the legislative session. Legal challenges over its constitutionality and compliance with civil rights law were filed, including one by the United States Department of Justice, that also asked for an injunction against enforcement of the law. The day before the law was to take effect, a federal judge issued a preliminary injunction that blocked the law's most controversial provisions. In June 2012, the U.S. Supreme Court ruled on the case Arizona v. United States, upholding the provision requiring immigration status checks during law enforcement stops but striking down three other provisions as violations of the Supremacy Clause of the United States Constitution.

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