Socal i dont disagree, but there is a distinction between your example.
A country may have its own view on a safe alcohol level, and who is to say their view is wrong, and they may have a view that an faa ir does not cut the mustard - and who is to say they are wrong. However to cut the mustard in an identical aircraft distinguished only by the letter on the side is banal. In your example that would mean you would be legal in a car in holland with 10 mg in your blood but change the plates on the car and you would mysteriously be illegal. The faa ir is good enough with a n on the side but not good enough with a g. The imcr is good enough to the fir but 10 feet the other side isnt even though we are meant to all be in the same european boat. Imagine the french refusing to accept a britsh driving licence! Or we a french licence.
The law is the law, but just sometimes it takes brave people to point out the law is an ass.
