(Our happy-hour fact to amaze your drinking buddies with.)

U.S. soldiers fighting in Afghanistan and Iraq will soon be issued hand-held lie detectors to test the reliability of witnesses during the heat of battle.

Around 94 of the new devices, known as Preliminary Credibility Assessment Screening Systems, will be issued in the coming months. They cost about $7,500 each and have already been tested in Iraq.

The decision to issue the machines has angered some, because polygraph tests are so notoriously unreliable. While even the Pentagon admits that the new machines will not be perfect, hopes are still high that they will improve security.

But if the lie detectors are that impressive, there's a lot more they can do. Screen some U.S. politicians, for example.