Every time somebody gets caught over the limit, these things turn in to a slinging match between those saying “just drink in moderation” and then tee-totallers arguing that if you can’t have 24 hours without a drink then you’re an alcoholic.
Some people drink, some people don’t, some people drink on 12/24/36/48 hour layovers in perfect moderation, some people drink too much on those layovers.
The trick is moderation, as previously discussed. If on a nightstop/layover and you fancy a glass of wine with a meal then that if you’re choice as an adult and as a professional. It does not mean that person has a drinking problem. In fact if as an adult and a professional, even if on a single occasion you have too much to drink on a layover you can still act as an adult and a professional and call in sick (unfit for duty as you are!) even that doesn’t define you as having a drinking problem. Of course if it becomes a pattern of behaviour then it may indicate an issue.We are all human and make mistakes. It’s how we deal with those mistakes that defines us.
The reality is, we do not need more blanket rules such as “no drinking down route”. We just need professionals to behave like professionals.