Two Inspectors General believe their may be criminal wrongdoing at the IRS in attempting to hide Lois Lerner's e-mails from Congressional investigators. Koskinen, head of the IRS, testified under oath that the e-mails could not be retrieved. The Inspectors discovered that not one IT person was asked to try and retrieve those e-mails. 33,000 emails have been recovered likely with more to come.
Washington Post
Washington Post