These people are stupid …
> If you’re not being compelled to answer questions by the OIG, then the interview is voluntary. When your interview is voluntary, that means the OIG is running a criminal investigation of you (which is why you have a Fifth Amendment right to silence), and you would surely want counsel before answering under such a legal circumstance.
> In a voluntary interview, anything you say can be later used against you to bring criminal charges. We always work to obtain a compelled OIG interview.
> When your answers are compelled by an agent of the U.S. government, your responses cannot be used against you to bring criminal charges. Compelled interviews mean the OIG and agency can only act against you by way of a disciplinary action and not by bringing criminal charges.
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http://askthelawyer.federaltimes.com/2015/10/26/you-have-the-right-to-what-exactly/
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http://askthelawyer.federaltimes.com/2015/12/04/know-your-rights-part-2/
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http://askthelawyer.federaltimes.com/2016/01/13/oig-interviews-they-can-lie-to-you/