The bill also allows police to arrest anyone suspected of being an illegal immigrant if they're stopped for any other reason. Alabama employers also are now required to use a federal system called E-Verify to determine if new workers are in the country legally.
Gov. Robert Bentley said the law is the nation's toughest, and groups including the American Civil Liberties Union and the Montgomery-based Southern Poverty Law Center agree. The groups say they plan to challenge it.