During the Killian documents controversy in 2004, the authenticity of the documents themselves was disputed by a variety of individuals and groups. Proof of authenticity is not possible without original documents, and since CBS used only faxed and photocopied duplicates, authentication to professional standards would be impossible regardless of the provenance of the originals. However, proving documents inauthentic does not depend on the availability of originals, and the validity of these photocopied documents has been challenged on a number of grounds, ranging from anachronisms in their typography to issues pertaining to their content. Typography In the initial hours and days after the CBS broadcast, most of the criticism of the documents' authenticity centered on the fact that they did not look like typical typewritten documents and appeared very similar to documents produced with modern word-processing software. These criticisms, first raised by bloggers, were taken up by outlets of the mainstream press, including The Washington Post, The New York Times, the Chicago Sun-Times, and others, who sought opinions from multiple experts. The arguments and findings are summarized below. Proportional fonts One of the initial doubts bloggers raised about the memos was the use of proportional fonts (as opposed to a monospaced typeface, where all glyphs have a single, standard width). Most typewriters in 1972 used fixed-width fonts, and, according to The Washington Post, all of the authenticated documents from the TexANG were typed using fixed-width fonts commonly associated with typewriters. Several experts interviewed by the media suggested that the proportional fonts in the documents indicated likely forgery. John Collins, vice president and chief technology officer at Bitstream Inc., the parent of MyFonts.com, stated that word processors that could produce proportional-sized fonts cost upwards of $20,000 at the time (). William Flynn, a forensic document specialist with 35 years of experience in police crime labs and private practice, said the CBS documents raise suspicions because of their use of proportional spacing techniques. The Washington Post also indicated the presence of proportional fonts as suspicious because "of more than 100 records made available by the 147th Group and the Texas Air National Guard, none used the proportional spacing techniques characteristic of the CBS documents". Bill Glennon, a technology consultant in New York City with typewriter repair experience from 1973 to 1985, said experts making the claim that typewriters were incapable of producing the memos "are full of crap. They just don't know." He