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This was the news story in early 2016: The Justice Department has granted immunity to a former State Department staffer, who worked on Hillary Clinton's private email server, as part of a criminal investigation into the possible mishandling of classified information, according to a senior law enforcement official.

The official said the FBI had secured the cooperation of Bryan Pagliano, who worked on Clinton's 2008 presidential campaign before setting up the server in her New York home in 2009.

Another in Sep 2016: Three key witnesses to Hillary Clinton's use of a private email server were given immunity from prosecution in exchange for their cooperation with the FBI's investigation, a top U.S. congressman said on Friday. The revelation is certain to fuel Republican anger over the FBI's handling of the Clinton investigation just days before she and GOP rival Donald Trump will face off at the first presidential debate.

Basically it was done in the Obama DOJ, and all "by the book" as Obama allegedly said in a meeting. It was so "by the book" they had to hide it.