The sweeping legislation makes it a crime under state law to be in the country illegally. It also requires local police officers to question people about their immigration status if there is reason to suspect they are illegal immigrants.
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Arizona has an estimated 460,000 illegal immigrants and is the state with the most illegal border crossings, with the harsh, remote desert serving as the gateway for thousands of Mexicans and Central Americans.
Other provisions of the bill allow lawsuits against government agencies that hinder enforcement of immigration laws, and make it illegal to hire illegal immigrants for day labor or knowingly transport them.
The bill takes effect 90 days after the current legislative session ends.