Arizona’s authority to confront its illegal immigration woes was again reined in Wednesday when a federal appeals court threw out a 2006 voter-approved law denying bail to people in the country illegally who are charged with certain crimes…The courts have slowly dismantled laws that sought to draw local police into immigration enforcement as frustrations in the state grew over what critics said was inadequate border protection by the federal government. ‘It’s proved to be a failed experiment,’ said Peter Spiro, a Temple University law professor who specializes in immigration law.