Why has anybody a problem with being tested for alcohol prior to a flight? If it is done in the CREW CENTRE than they give a signal to all the rest of the crew as well. Everybody now knows that there is a chance that you have to go through a alcohol test before they let you go airside.
It is very simple you can have it in two ways.
They can test you in the CREW CENTRE. And if you haven't had a drink than you are allright. (the Dutch way)
Or they come over drag you off the airplane in front of fare paying passengers and than do a alcohol test. (the UK way)
I think the first option is the better one. At least it is not done in front of fare paying passengers and you don't have to do "the walk of shame"through the passenger cabin when the police escorts you of the plane.
It's up to you which way you prefer. And regarding the nervous passengers, it is maybe better for them if they know that crews are being tested for alcohol as well. At this moment they read a lot in the news regarding drunk flight crew so it should calm them down if they know that their crew passed the alcohol test.
Regards, FT