Saxus Circus Maximus
I can't be sure, but I think in France if an employee has a drinking or drug problem it's probably a motive for sacking him/her with aggravated fault (Licenciement pour faute grave) and no compensation...I don't know how it working in France but here in Sweden it's the employer responsibility to deal with if an employee have alcohol and drug problems. They pay for it. Often it's the 12-step program. It's based on AA. I guess it's the same In France. Or it should be.
See, very different cultures!
A few years ago I got fired because I had a burn out! Not directly related, but it gives an idea of the trend.