Idunno
Ground staff 'smelling alcohol' on the breath of pilots, jumping to a conclusion
I'm not being facetious when I say this, but perhaps a handful of TicTacs on the crew bus might have saved some careers.
Not excusing drinking before flying mind you
So what are you doing? - either the guy was drinking and over the limit or he was not. Its not rocket science.
If the ground staff suspect that a member of the flight crew is pissed what do you expect them to do? - the police/judiciary are the correct people to decide on this particular matter - if they are trusted to decide on whether you are drunk in charge of a car, why not an aircraft?