Can they actually read anything meaningful? Last time I've looked up research on emotion reading, you needed a device much more elaborated than what you see in the picture (and it was still shit). It could just be another case of a company lobbying to put these devices everywhere to get money, it would not be the first feel-good/bogus security device deployed at a large scale. It might just be similar to the fake bomb detector: http://www.bbc.com/news/uk-29459896.