CBS’s cruise down Denial River may be coming to an end: Expert Cited by CBS Says He Didn’t Authenticate Papers.

The lead expert retained by CBS News to examine disputed memos from President Bush’s former squadron commander in the National Guard said yesterday that he examined only the late officer’s signature and made no attempt to authenticate the documents themselves.

“There’s no way that I, as a document expert, can authenticate them,” Marcel Matley said in a telephone interview from San Francisco. The main reason, he said, is that they are “copies” that are “far removed” from the originals.

Matley’s comments came amid growing evidence challenging the authenticity of the documents aired Wednesday on CBS’s “60 Minutes.” The program was part of an investigation asserting that Bush benefited from political favoritism in getting out of commitments to the Texas Air National Guard. On last night’s “CBS Evening News,” Rather said again that the network “believes the documents are authentic.”

A detailed comparison by The Washington Post of memos obtained by CBS News with authenticated documents on Bush’s National Guard service reveals dozens of inconsistencies, ranging from conflicting military terminology to different word-processing techniques.

The analysis shows that half a dozen Killian memos released earlier by the military were written with a standard typewriter using different formatting techniques from those characteristic of computer-generated documents. CBS’s Killian memos bear numerous signs that are more consistent with modern-day word-processing programs, particularly Microsoft Word.

“I am personally 100 percent sure that they are fake,” said Joseph M. Newcomer, author of several books on Windows programming, who worked on electronic typesetting techniques in the early 1970s. Newcomer said he had produced virtually exact replicas of the CBS documents using Microsoft Word formatting and the Times New Roman font.

Newcomer drew an analogy with an art expert trying to determine whether a painting of unknown provenance was painted by Leonardo Da Vinci. “If I was looking for a Da Vinci, I would look for characteristic brush strokes,” he said. “If I found something that was painted with a modern synthetic brush, I would know that I have a forgery.”