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Video: FBI agents forced to sign rare NDA for Hillary Clinton email probe

FBI agents who worked on the Hillary Clinton email server case had to sign a special non-disclosure agreement, or NDA, telling them not to talk about the probe to anyone, unless they were testifying under oath.

Anyone who signed the NDA is also subject to lie detector tests.

This is according to a letter by a senior FBI deputy to Congressman Chuck Grassley.

The letter refers to this secretive, special NDA as a Case Briefing Acknowledgement.

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