Lethal injection case exposes U.S. top court's death penalty divide

By Lawrence Hurley WASHINGTON (Reuters) - Tensions on the Supreme Court over America's use of the death penalty boiled over on Wednesday as the justices appeared badly split in a case challenging Oklahoma's lethal injection method as a breach of the Constitution's ban on cruel and unusual punishment. The nine-member court's five conservatives seemed likely to side with Oklahoma in the case brought by three death row inmates, while its four liberals expressed doubt about the p