-Caveat Lector-
http://news.bbc.co.uk/hi/english/sci/tech/newsid_1739000/1739413.stm
Wednesday, 2 January, 2002, 20:24 GMT
Spotting the face of deception
Heat coming off the face can be used to detect liars
By BBC News Online's Helen Briggs
The airports of the future could identify potential terrorists by
using a lie detector that spots concealed blushing with a super-
sensitive thermal imaging camera.
Liars are betrayed by the heat that rushes to their face when they
tell a fib, according to scientists in the United States.
There is an urgent need to devise technologies to identify
individuals intending to perform acts of terrorism
Mayo clinic team
Blood flow to the surface of the skin around the eyes increases when someone tells a
lie.
The tiny hot spots are invisible to the naked eye but can be measured by thermal
imaging, says a team led by James Levine of the Mayo Clinic in Rochester, Minnesota.
The researchers believe the new test could be used under cover at airports to identify
potential terrorists.
They write in the journal Nature: "There is an urgent need to devise technologies that
can be used for automated, high-throughput screening to identify individuals intending
to perform acts of terrorism."
At present, airports have to rely on a passenger's response to brief questions such
as: "Did you pack your own bags?"
Hands-off approach
The new system was tested on 20 volunteers who were told to carry out a fake crime.
The individuals were asked to stab a mannequin and rob it of $20, before pleading
their innocence when questioned.
Another group of people who had no knowledge of the crime were also tested with
thermal imaging.
Using the equipment, the scientists managed to correctly identify as guilty
seventy-five percent of the 'criminals', while 90% of the 'innocent' group were
successfully cleared of blame.
The results were as good as those from a traditional polygraph, or lie detector test.
The best technology we have available to us ... is the human brain
Philip Baum, Airport Security International
Polygraphs, which have been used for many years, are accepted in some courts of law.
They monitor physiological signs like breathing, sweat production and cardiovascular
activity.
But they have to be carried out by highly trained operators and the results take time
to analyse.
The new method has the advantage that it is instant and can be used without physical
contact by untrained staff in a variety of different situations.
Philip Baum, Editor of Aviation Security International, said further
trials of the test were needed under real-life conditions.
He told BBC News Online: "It shows promise but there's a long way to
go.
"We can't become overly reliant on technology except for the best
technology we have available to us and that is the human brain."
~~~~~~~~~~~~~~~
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