U.S. District Court Judge Susan Bolton lifted an injunction against the section of the law that requires police officers to check the legal status of people under certain conditions, The Arizona Republic of Phoenix reported.
Bolton's three-paragraph ruling was drafted jointly by the U.S. Justice Department and lawyers for the state of Arizona.
She imposed an injunction on key parts of the Arizona immigration law in July 2010.
Arizona took the case to the U.S. Supreme court which upheld all but one part of Bolton's injunction, section 2B.
That section requires Arizona officers to make an attempt to determine the immigration status of a person stopped, detained or arrested if there is reasonable suspicion that the person is in the country illegally.
Arizona Gov. Jan Brewer applauded the court's Tuesday decision.