My company has the following procedure:
1) Alcoholism is indeed a sickness from which people can be cured
2) The company will assist you to get proper treatment
3) All crewmembers are responsible for each other with respect to the abuse of alcohol while on nightstops (as far as is sensible)
4) If a crewmember is susspected of being intoxicated he will be given the choice of reporting sick or being checked, if then found intoxicate immediate termination of employment will follow, if not no record will be kept.
To me this seems a simple but fair procedure, basically you'll be ok as long as you are not caught. Crewmembers who suspect alcoholism with a fellow crewmember are encougaged to seek indipendent aid for this abusing (sick) crewmember.
So far this procedure has helped two great pilots to overcome their addiction, possibly even more but such information is kept confidential of course.
Nick