In a New York Times op-ed piece titled “The Anthrax Files,” columnist Nicholas D. Kristof writes that virologist Dr. Steven J. Hatfill “has…failed three successive polygraph examinations since January, and canceled plans for another polygraph exam two weeks ago.” Kristof does not state his source for this information. For discussion of the use of polygraphs in the ongoing anthrax investigation, see the AntiPolygraph.org message board thread Federal Anthrax Probe Turns to Polygraph.