_ Ruled for employers who want to force unionized workers to pursue their age discrimination claims through arbitration instead of a federal lawsuit. The court, in a 5-4 decision, said an arbitration agreement negotiated between an employer and a union that strips them of their option to take complaints to court is binding on workers. The dissenting justices said the high court in the past ruled that unions cannot bargain away employees' federal forum rights in discrimination cases.

_ Said the federal government should pay federally appointed lawyers for working on state clemency requests for death row inmates. The 6th U.S. Circuit Court of Appeals in Cincinnati had said that the law does not allow federal public defenders to be paid for working on state clemency requests. The high court disagreed and reversed that decision on a 7-2 vote.

_ Ruled that the government may consider cost in deciding whether to order power plants to undertake environmental upgrades that would protect fish. The 2nd U.S. Circuit Court of Appeals in New York said that the Clean Water Act does not allow cost to be used when deciding what technology would best minimize environmental impacts. But Justice Antonin Scalia, writing for a 6-3 majority, said even the appeals court and environmentalists "concede that some form of cost-benefit analysis is permitted."