OKLAHOMA CITY -- The federal government is investigating whether the Oklahoma Department of Public Safety violated the civil rights of Iranian immigrants by refusing to provide them with driver's license tests in their native Farsi language. The National Highway Traffic Safety Administration launched the investigation in March after a complaint filed on behalf of two Iranian nationals living in Bartlesville accused the state agency of unlawful discrimination based on their national origin, according to a letter from the NHTSA to Public Safety Commissioner Kevin Ward. Public safety officials said Tuesday that offering state driver's license tests in Farsi could force...