BANGOR, Maine — Suzanne Muscara, 37, of Burlington, Maine pleaded not guilty in federal court on Thursday.
Muscara was arrested and charged earlier this month after sending a letter that she claimed contained ricin to Sen. Susan Collins' Bangor home.
Muscara was officially charged with mailing a threatening communication to a U.S. government official protected under federal law.
Muscara will stand trial in June. If convicted, she faces up to 10 years in prison and a $250,000 fine.
