Floyd Ray Roseberry pleaded not guilty in federal court on Wednesday to charges of threatening “use of weapons of mass destruction” and “threats to use explosive materials.” “The court found him competent to go forward with proceedings and he was arraigned on an indictment returned last week,” Bill Miller, the public information officer for the U.S. Attorney’s Office for the District of Columbia, told The Epoch Times. A grand jury returned an indictment of Roseberry on Sept. 14. From Grover, North Carolina, the 49-year-old defendant was reported to have a bipolar disorder being treated with ineffective medication. Magistrate Judge Zia Faruqui ruled that a new treatment that had been prescribed within the month since the incident happened was proving effective, allowing Roseberry to stand trial. Roseberry was taken into custody on Aug. 19, after claiming that he had a bomb in his truck parked outside the Library of Congress at …