In a court of law, you are not allowed to use the fact that someone is pleading the fifth; that is refusing to incriminate themselves, as evidence in and of itself that they are guilty of a crime. In the real world, there seems an implicit admission of wrongding, likley criminal wrong doing, in pleading the fifth.
"The Los Angeles Times reported Tuesday afternoon that Lois Lerner, who heads up the Internal Revenue Service's tax-exempt division, plans to invoke the Fifth Amendment to the U.S. Constitution in a hearing Wednesday before the House Committee on Oversight and Government Affairs.
The Fifth Amendment provides that U.S. citizens may not be compelled to offer testimony if telling the truth would incriminate them.
Lerner's defense lawyer, William W. Taylor III, wrote to the committee on Tuesday that his client would refuse to answer questions related to what she knew about the extra levels of scrutiny applied to conservative nonprofit organizations that applied for tax-exempt status beginning in 2010."