A new lie detector test has been invented that could help airport staff pick out possible terrorists from ordinary passengers.
At the moment they have to rely on a passenger's response to questions such as: "Did you pack your own bags?"
The new test picks up hidden blushing in the eyes with a special sensitive camera.
Easy to use
According to scientists in America, liars are given away by heat that rushes to their face when they tell a fib.
This new test is very easy to use.
It's instant, can be used without physical contact and staff don't need to be trained to use it.