We're not sure if Georgia Koukiou and Vassilis Anastassopoulos of the University of Patras in Greece like a tipple or not, but the pair have developed two algorithms that, when used with thermal imaging, could pick out drunk people in crowds. What is it that betrays your best intentions to look sober? As always, your face. Booze causes the blood-vessels in your visage to dilate, and the researchers used this principle to compare facial scans against a database of tipple-free mug shots. Likewise the duo found that when under the influence, the nose gets warmer, while the forehead cools -- another visual check that the infrared can help identify. The hope is that using this technology, law-enforcement can make a judgement call based on more than just your wonky walk. But in our experience, the troublemakers are pretty good at outing themselves.