>> Getting an accurate enough sample from your breath without cooperation and breathing into a tube is probably impossible. > There are numerous companies work

>> Getting an accurate enough sample from your breath without cooperation and breathing into a tube is probably impossible. > There are numerous companies working on artificial noses that car manufacturers have been looking to integrate in order to have an equivalent of white noise generators but of course for smell. These are completely different things. To detect intoxication for drunk driving, you need to accurately estimate the concentration of alcohol in the driver's blood. Detecting the "smell" of alcohol in the car does not do that. It's also likely impossible to detect blood alcohol concentration in real-life conditions by sampling ambient air (what if they're the DD driving home a bunch of drunks? what if the window's open? what if they had liquor spilled on them?).