The Demon Drink
Getting a alcohol blood or breath check as a pilot is IMHO very unusual at present and in most reported instances the individuals concerned were either "shopped" by colleagues or caught after flying erratically. The third group of positive test samples comes from postmortem toxicology specimens.
The bottom line here is that alcohol, (even alcohol consumed the night before the morning after) severely affects performance, judgement and mood.
Many drugs are worse.
Even if blood or breath limits are not exceeded the negative effects of alcohol and drugs can drag on for far longer than we would expect.
I only drink if I am certain that I will not need to fly and/or work the next day.
Getting up the next morning is so much easier if you haven't had a drink the night before,
SB