A federal audit gave favorable grades to Maricopa County Sheriff Joe Arpaio for his treatment of inmates, amid a Justice Department probe into possible discrimination by the Arizona lawman against Hispanic inmates. Mr. Arpaio's lawyer said the audit grades from the U.S. Marshals Service show the sheriff runs a clean operation and underscore his contention that the probe is politically motivated. The Justice Department said in a statement that its investigation "pertains to allegations of discrimination in jails and police practices that are not covered by the Marshals Service review." Mr. Arpaio has gained a national reputation as an anti-illegal...