[From article]
"What we try and do is experiment with the face itself, but it is purely non-invasive, which means the person is probably not aware the measurements are being taken.
Tell tales: High definition video measures changes in facial expression based on distances between measured points while thermal imaging shows increases in blood flow
How covert cameras detecting hot flushes will reveal who is lying at airport security
By Eleanor Harding
Daily Mail (UK)
Last updated at 4:30 PM on 4th September 2011
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