Vnity is about as old as mankind. With vanity, various ways come to change one's appearance. Wider lips. Narrower mouth. Wider eyes. Different shape of eyes. Name a facial feature, there is a way to enhance or suppress it. Face-recognition systems rely on visual appearance. They typically need edges - edges of mouth, edges of eyes...; one popular algorithm for indexing a face is recognizing these points and measuring their distance. A little amount of properly applied pigment could shift these values by couple percents. So low-tech device a lipstick is could be a potential tool for lowering the probability of a successful identification by face recognition. Ladies often carry many more similar "terrorist tools" in their purses. Opinions, comments?