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It's September 28, 2006 in Washington, D.C., and a congressional hearing is underway on Capitol Hill.

Patricia Dunn, the former chairman of the board of the Hewlett Packard Company, shifts uneasily in her seat as she sits in front of a congressional panel.

If you would please stand and raise your right hand.

Do you soundly swear that the testimony you're about to give is the truth, whole truth and nothing but the truth.

Patricia is nervous. Recently Newsweek revealed that she launched an illegal spying campaign against her fellow board members at HP, as well as members of the media.

Patricia admits to this at least in part. She says certain board members were leaking sensitive information to the press.

In response, she launched a campaign to find the leaker.

But Patricia denies knowing about or proving of anything illegal. Still, it's clear few in Congress believe her.

Deep into her testimony, Oregon Congressman Greg Walden grills her on the dubious methods used by her HP investigators.

So they never described the process to you that they were using?

No one ever described to me that the fraudulent use of identity was part of how the HP way of conducting internal investigations.

Pretexting, a method of accessing phone records has been at the heart of the scandal. Investigators hired by Hewlett Packard called telephone companies and impersonated members of HP's board in order to gain access to their private phone records and to discover which journalists they've been talking to.

But Patricia swears she did not know her investigators were breaking the law.

How did you think they were getting these phone records?

My understanding was that these records were publicly available. I understood that you could call up and get phone records that it was a common investigative technique.

So you think I can call up as anybody in the public and get your phone records?

I thought a year ago, I thought six months ago that indeed you could.

Then you really believe that?

I'm sorry here, but you believe that I could call whoever your carrier is and say, I'm Congressman Greg Walden.

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