Dozens of people working for the CIA were on the ground in Benghazi, Libya, the night of last year's Sept. 11 attack on the U.S. Consulate, according to a new CNN report.
CNN reported the CIA is taking extraordinary measures to make sure no one finds out what those people were doing.
Some of the CIA operatives involved in Libya have had to take lie detector tests once a month. They normally go through such a test once every three or four years.
The goal is to see if they have been talking to the media or Congress.
Meanwhile, Congress continues to investigate the Benghazi attack that left four Americans dead, including U.S. Ambassador to Libya Chris Stevens.
They believe the Obama administration is engaged in a cover-up.