I've had the cops on the aircraft in AMS to do alcohol tests on the crew.
I was confident that we'd all pass but helluva worried about the possibility of anyone failing the test (crew arrested, handcuffs on, jail, court trial, sacking etc) never mind having to cancel the service.
The cop did not do the tests in the end as pax were boarding (it was 1600 LT btw) but like the OP, I wonder where exactly we stand legally.
I suspect, you have no alternative but to submit to the test though.
I have heard that a tee-total person can easily blow a 0.17 and that is why the Dutch have the limit set at 0.20.
