Critics of the Arizona law predict it will lead to discrimination against Latinos if police are authorized to question motorists and pedestrians about their immigration status. It will "cause intolerable harassment and lengthy detentions," Lucas Guttentag, who teaches immigration law at Yale University and Stanford University, said after the oral arguments.
If the high court were to revive the stop-and-arrest provisions, Arizona could move to enforce the law.
But it would not end the legal battle. Civil rights and civil liberties groups are challenging the measure on different grounds from the Obama administration, saying it would lead to racial profiling and harassment of Latino residents and violate their civil rights.