The Pentagon has begun forcing some of its employees to undergo lie detector tests in an attempt to find out who leaked highly classified information to Iraqi exile leader Ahmed Chalabi. Chalabi has been accused of sharing secret information with Iran about U.S. war plans in Iraq and tipping Iran off to the fact that the U.S. had broken Iran’s top-secret intelligence code which allowed the U.S. to easily spy on Iran’s intelligence services. Chalabi has denied the charges. Newsweek is reporting Chalabi may have also attempted to blackmail U.S. officials by collecting and maintaining files of potentially damaging information on U.S. officials. Some officials said that when Chalabi’s offices were raided last month, American officials had hoped to find Chalabi’s cache of information he had gathered on Americans.