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Civilize the mind, but make savage the body.

- Chinese proverb

Benenson said such immunity is granted to encourage witnesses to cooperate by ensuring them that anything uncovered in their files outside the scope of the investigation cannot be used against them.

The "immunity" defense works for foreign countries (cough*Saudi*cough) so why not U.S government officials...

 Mr. Comey said, “we cannot find a case that would support bringing criminal charges on these facts.

Maybe because we already gave everyone immunity (in exchange for what we may never know).

Paul Combetta, a computer specialist with no security clearance but he and the people at Platte River Networks had access to Clintons private server.
Bryan Pagliano, a tech expert who set up Clintons email. He refused a subpoena by congress and now is in contempt for it.
Cheryl Mills, Hillary's former chief of staff
Ms Mills gave federal investigators access to her laptop on the condition that what they found couldn't be used against her.
John Bentel, then-director of the State Department's office of information resources management
Heather Samuelson, a senior adviser to Mrs Clinton

None of these people will talk to the over sight committee even though they have immunity so we may never know the truth.



"This was in fact so highly irregular that Jason Chaffetz, chair of the House Oversight Committee, pronounced himself “absolutely stunned” by the FBI’s granting of immunity to Cheryl Mills – which he learned of only on Friday. “No wonder they couldn’t prosecute a case,” Rep. Chaffetz observed of Comey’s Bureau: “They were handing out immunity deals like candy.”

Probably the real reason they didn't want to prosecute :
Everyone knew-
"Most intriguing, however, is the revelation that Hillary was communicating with President Obama via personal email, and he was using an alias. The alias he used with Hillary, and apparently others, was withheld by the FBI, and let it be said the fact that the president wanted to disguise his identity in unclassified email is not all that odd.
What is odd, however, is the fact that Obama previously told the media that he only learned of Hillary’s irregular email and server arrangements from “news reports.” How the president failed to notice that he was emailing his top diplomat at her personal, clintonmail.com address, not a state.gov account, particularly when they were discussing official business, is something Congress may want to find out – since certainly the FBI won’t."
http://observer.com/...mailgate-was-a-sham/