Although I'm not a fan of alcoholism, unlike other controversial products the primary victim is the person who chooses to ingest alcohol. However I would not be opposed to breathalyzers installed on commercial vehicles as well as cars operated by drivers with a recent history of drunk driving with use required at start up. Due to the potential for malfunction in an emergency, I'd say all vehicles should still operate in all cases but any over the limit readings automatically send alerts to the vehicles owners as well as law enforcement and the vehicle's location is tracked so the whoever needs to know may verify it was a false reading or an accurate reading leading to the intoxicated operator arrested and prosecuted if it was driven.
I'm also okay with discounted health, auto and life insurance premiums for those of us who do not engage in unhealthy lifestyle choices on a wide range of categories including excessive alcohol consumption. We can verify it at least to some extent by having a no cost drivers license special "no-alcohol" photo background color. This is already done for younger drivers in my state where those under 21 have a yellow background on the DL photo but for those 21 and over the background is light blue. It doesn't cost anybody any fees. It just alerts bars, restaurants and stores that the potential buyer of an alcoholic beverage was under the legal age at the time the license was issued and to check the date of birth to make sure he/she is now legal. This could be offered at no cost to everybody upon request regardless of age, then the insurance companies can offer a discount everyone with a yellow background. The only hassle would be bars, restaurants and stores would have to start carding everyone and not sell adult beverages to anybody with a yellow DL even if they're 50. Its not 100% full-proof but what is?