JACKSON, Miss. (AP) - A judge says there is enough evidence for a grand jury to hear the case against a Mississippi man accused of sending ricin-laced letters to President Barack Obama and others. An FBI agent testified Thursday that a dust mask that tested positive for ricin also contained some of James Everett Dutshcke's DNA. The agent says another person's DNA was on the mask, but Dutshcke was the major contributor. Dutshcke was arrested Saturday. He is accused of sending the poison-laced letters to Obama, U.S. Sen. Roger Wicker and a Mississippi judge. Dutshcke's attorney waived a detention hearing, so he will remain behind bars. He has previously denied sending the letters. Grand juries are secretive and it's not clear when one would hear evidence in the case.