WASHINGTON (AP) - Legal proceedings were expected Monday in a federal court in Baltimore against a college student who the FBI believes hid box cutters and other banned items aboard two Southwest Airlines planes, the agency said. Government prosecutors still were trying to determine what charges they might bring against Nathaniel T. Heatwole. The 20-year-old student had warned officials he would try to bring forbidden articles onto commercial flights to expose holes in security, an official said.A federal law enforcement official confirmed Saturday that investigators are interviewing Heatwole, of Greensboro, N.C., to learn how he got through airport screeners while...