Miller was the only major U.S. media reporter, and "The New York Times" the only major U.S. media organization, to be victimized by a fake anthrax letter in the fall of 2001. Miller had reported extensively on the subject of biological threats and had co-authored, with Stephen Engelberg and William Broad, a book on bio-terrorism, "", which was published on October 2, 2001. Miller co-authored an article on Pentagon plans to develop a more potent version of weaponized anthrax, "U.S. Germ Warfare Research Pushes Treaty Limits", published in "The New York Times" on September 4, 2001, weeks before the first anthrax mailings.