Supreme Court justices clashed on Wednesday over how states execute killers, with one court member saying current lethal-injection drugs would not be used on cats and dogs and a second arguing that executions do not have to be pain-free. The court blocked Florida, at the last minute, from executing Clarence Hill in January, as Hill lay on a gurney with IV lines in his arms. The justices took up his case with a lively and sometimes contentious discussion about the way states carry out capital punishment. The court's ruling will determine whether inmates can file last-minute civil rights challenges claiming...