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The government will use any and all information at its disposal to find journalist sources, as shown in The Washington Post's report this morning on a Department of Justice investigation into Fox News chief correspondent James Rosen, who may face criminal charges for reporting government secrets.

In June 2009, Rosen reported on CIA analysis suggesting that North Korea might respond to new UN sanctions with renewed nuclear tests. In order to determine how Rosen learned of the analysis, which had been issued by the CIA only a few hours prior, FBI investigators used every tool at their disposal: analyzing Rosen's security access card to determine when he entered and left the State Department building, studying his phone records, and subpoenaing his personal email.

Ultimately, agents determined the source of the leak was likely the State Department's Stephen Jin-Woo Kim. Rosen and Kim established a high-tech version of the red-flag-in-a-planter system used by Bob Woodward during Watergate: when Kim wanted to meet, he would allegedly send an email to Rosen's Gmail account containing an asterisk. Rosen detailed the sorts of things he wanted to discuss.

He also wrote, according to the affidavit: “What I am interested in, as you might expect, is breaking news ahead of my competitors” including “what intelligence is picking up.” And: “I’d love to see some internal State Department analyses.”

According to the Post report, that's what Kim allegedly provided. And the way in which he did so appears to have been indiscreet. Their federally distributed security passes showed that Rosen and Kim left and returned to a building at the same time on the day of the leak. Kim's department phone records showed a number of calls between him and Rosen. When you work directly for Big Brother, you're likely to be caught.