> I think in some European countries this is even part of labor law (so a company can't e.g. fire a worker for hearing he went out drinking heavily on the week

> I think in some European countries this is even part of labor law (so a company can't e.g. fire a worker for hearing he went out drinking heavily on the weekend). That would depend. The industry I work in (infrastructure management) is very H&S focused, so if you weren't completely sober and able to work safely on Monday morning you would be at best sent home, and at worst fired.