A NEW test has been created to catch out people who can trick a normal lie detector.
Researchers at the University of Portsmouth have developed the system, which relies on the liar avoiding revealing any guilty information.
For the experiment, which was published in 'Legal and Criminological Psychology', 86 people were asked to commit a mock crime by stealing a data file in the form of a PDF. A further 82 people allocated to the control group had no knowledge of the crime.
All of the participants were then subjected to a test which requires people to choose one word from a pair of words. Each pair contains a word relating to the crime, and a neutral word.
In the test, innocent people with no knowledge of the crime chose an equal number of crime-related and neutral words. If someone fails the test, it is a strong indication of guilt.