WASHINGTON -- Former Mayor Marion Barry, who once served prison time on a drug charge, may have a new legal problem. There are reports the government is investigating whether he has filed any federal income tax returns since 1998. Barry is not talking. Citing unnamed sources, several local news outlets reported that Barry, 69, has been the target of an Internal Revenue Service investigation. Barry, a four-term mayor, was elected last November as the councilman representing the city's working class Ward 8. "He will talk when his lawyer says it's OK," said Linda Greene, Barry's chief of staff. Barry is...