According to the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), vodka is an odorless, colorless, tasteless spirit, and among cocktail enthusiasts it has earned a reputation as the de facto drink of choice for those who don't like the taste of alcohol.

Is vodka odorless on your breath?

There is only one problem with this: Alcohol has no odor. Assuming the officer actually does smell an odor on the breath, what he is smelling is not ethyl alcohol but the flavoring in the beverage. ... A much stronger drink, such as scotch, will have a weaker odor. And vodka leaves virtually no odor at all.

What liquor doesn't smell on your breath?

Alcohol doesn't have any smell. It's the hops, barley and other "stuff" that you can smell on your breath. The answer is to drink a clear spirit (or white spirit! - perhaps not) such as vodka.