Interesting that many of the comments on here are based on 'war stories', anecdotal evidence and/or emotionally motivated opinion yet few raise points about the following: what do the SOPs/Ops Manual/Company manual state? - i.e. PROCEDURES, what about Human Factors? How about SMS and Just Culture? Then, of course, the regulations. Presumably, BA has a set of procedures based upon the regulations that takes into consideration the principles of HF/SMS principles for A) acceptable consumption of alcohol and B) dealing with those who don't respect (A) - if an individual knowingly and willing breaks the the 'bottle to throttle' rules and chances it, then they know the repercussions. The crew who suspect that a breach has occurred should follow the Company procedures and if that requires calling the Police then so be it (suspect BA rules don't require this and should be handled internally unless the pilot is being unruly). Long-gone is the day where you cover for your 'mates' etc. Given the rosters, there are ample opportunities to get sauced between periods when you are on-duty. If you are responsible enough to fly 400+ pax on a long-haul flight, you need to be responsible enough to follow the rules and accept the accountability for breaking them.