I've got no problem with someone having a (singular) drink...with a meal...and waiting an hour, then driving home.
Beyond that, no go, zero tolerance. You get one warning. Second time, permanent loss of driving privileges.
But I'm not in charge, so w/e.
Everyone thinks they are a special snowflake and that they can make the judgment (while impaired, even to whatever degree) on the basis of their own imagined superhuman biochemistry. But it doesn't work that way. Reality steps in and kills 10,000 people every year regardless of whether or not they think there is some specious difference between being "buzzed" and being falling down drunk in terms of reduced reaction times and distorted coordination.
Everyone thinks their unique badassery will overcome until they wipe out an entire family driving home one night.
Simple solution to all of this: Just don't f**k do it.