I'm not sure blowing beer breath into your mates face qualifies as "using a calibrated breath tester".I know what you mean. My limit is one pint. I did two one night and struggled a bit with apexes.
No problem in the cage though, but the attention level on bikes is that much higher.
If the terminally outraged are thinking of having a go at me, I use a calibrated breath tester before I drive, so I am legal.