PHOENIX (AP) — The immigration debate in Arizona reached a boiling point in 2007 when the state passed a groundbreaking law targeting those often blamed with fueling the nation's border woes: Employers who hire immigrants living in the U.S. illegally.

The law marked a bold step by a state into an area that had long been the domain of the federal government, and it paved the way for Arizona's landmark 2010 immigration law. It also represented a key moment in the immigration battles that continue today as Congress mulls a proposed overhaul of the immigration system.

But an examination of the law by The Associated Press found that it has done little to crack down on problematic employers. Only three of the state's 147,000 employers have been brought to civil court on illegal hiring allegations, while several hundred employees who are living in the U.S. illegally have been arrested under a section of the law that made it a felony to use fake or stolen IDs to get jobs.