Do you see that guy over there with his balaclava, in front of the door of that luxurious house? He is planning a bad move. No doubt, he took out a small spray to modify the smell of his mouth and trick biometric security by imitating the owner’s breath. We used to surprise burglars with a crowbar or a hook in our hands. But science leaves no area of activity aside. This scene takes place in the near future. Thus, Japanese researchers succeeded – finally! we exclaim – to analyze the breath of individuals with enough precision to deduce their identity. They proclaim it with pride on the site of the Royal Society of Chemistry. It is that others, many others, had broken their nose there, precisely.