How in any way is the arrest of a CC member the "top priority" for any of the pax on board? You think they want to witness an arrest.....or get home to their loved one or maybe catch on onward connection or train?
Hardly in BA's interest either....to have a CC member arrested for a failed D&A in front of 180 of their customers
I've said pretty much everything I can on this thread so I'll bow out, but I do owe you a clarification on that part (as I can see how you've understood it).
What I meant by that is that, as a passenger, I would not want a cabin crew high on Class A drugs to be able to do it again, and if it requires extra time to ensure that this is prevented then it is in my interest for safety reasons.