This is an amusing story. Seems the folks at Dateline NBC sent one of their producers to the infamous hacker convention DEFCON, not entirely unusual as reporters are often in attendance, but rather than register as a reporter and get a press pass as required by the convention NBC’s reporter attempted to go undercover with a pinhole camera in clear violation of convention rules. The only flaw in this plan is that the convention organizers had been tipped off about her prior to the event ever starting so she was never really undercover at all:

Displeased with her intent, the organizers decided to give her several chances to get a legitimate press pass, the final chance coming after outing her in front of convention attendees in a mock-game of “spot the undercover reporter” (caught on video). Madigan fled, much to the delight of attendees who followed her out to the parking lot, mocking her along the way.
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Indeed, it was Madigan’s insistence on staying undercover, even when it was clear that she was never truly undercover to begin with, that set up the embarrassing outing in front of the standing-room-only crowd in Vegas.

After she had already declined to get a press pass several times, organizers fooled her, leading her to believe that she could get video of a federal agent being outed on the conference hall floor. After directing her to the hall in advance of the event, the organizers then set their own plan into motion, which was to out Madigan, not a Fed. Duped, Madigan fled the scene.

You’d think she’d be smart enough to recognize that it’s hard to be undercover when the people in charge know you’re there, but I’m not privy to the hiring standards of NBC producers.