WASHINGTON (Reuters) - The Justice Department declined to prosecute then-Transportation Secretary Elaine Chao after the inspector general's office referred allegations of potential misuse of office for review, a report made public on Wednesday said. The report included allegations that Chao directed staff to research or purchase personal items for her online using her personal credit card. In December, the inspector general's office referred its findings to the U.S. Attorney's Office for the District of Columbia for criminal prosecution, which declined to open a criminal investigation. Th...