Kapitan, the guy you mention should have sued for wrongful dismissal. Alcohol ban applies to a period before sign on. That is when you are on duty. You are not on duty on the way to sign on. You might be in uniform and you might be in a crew bus or your own transport. But, you are not on duty until you sign on. The ignorant & arrogant response of the employers saying "That is not how we interpret the rules" is astonishing. Rules are rules and are not open to interpretation.