It's a fact of Life that some people have a problem with alcohol, regardless of their professions.
It's also highly likely that there are people who are alcohol dependent, employed in jobs where this dependency may well create a risk to other people or persons.
A quiet word by one of the other co-employees, suggesting the person step down for the day, would be a far better scenario than that described here.
My Father was admitted to hospital for removal of his adenoids and tonsils many years ago, the Doctor (who had obviously also beem imbibing pre-op, judging by the smell of alcohol on his breath) also removed Dad's uvala!