Can cops smell vodka on your breath?

I'm curious, could you elaborate on the notion that police officers can allegedly detect vodka on someone's breath? Is there scientific evidence to support this claim? What methods do law enforcement officials typically use to identify alcohol consumption, and are they specific to vodka or can they detect other types of alcohol as well? Additionally, what are the legal implications if an individual is found to have vodka on their breath, and what steps can be taken to avoid such situations?