In a 2-1 decision Friday, the court said Michigan's Proposal 2 is unconstitutional because it burdens minorities. Voters approved the amendment to the state constitution in 2006, and the court notes the only way people who disagree with it can seek change is in another statewide vote.
The law has forced the University of Michigan and other public schools to change admissions policies giving minorities preferential treatment.
The ban passed with 58 percent of the vote nearly five years ago and also applies to government hiring.
California, Colorado, Nebraska and Washington state have similar bans. Arizona voters rejected one in November 2010.
