I would much rather the pilot had a little alcohol in his/her system than had spent a sleepless night in a hotel.
For many, "The Lunch Time Beer" before a long night flight was the afternoon naps' soporific of choice, (there was a better one of course, but rarely was a compliant example available - my lips are sealed ) and usually ensured a few hours sleep in a city hotel surrounded by traffic and Police sirens, whereas those who didn't indulge tossed and turned sleeplessly, and reported for work considerably less relaxed, and considerably more knackered some hours later when a demanding landing approached had to be completed.
Testing the crew after a normal sector, with no irregularity, is just crass nonsense, testing a crew to - maybe - prevent a future incident is one thing, but are 'they' going to prosecute a crew for successfully completing a flight !! Would 'they' prefer that crew had crashed and killed everyone , but were stone cold sober, so that was alright ?
The World has truly Gone Mad.