The "ancillary to an aviation function" bit seems a bit open to interpretation, or is it just me?
I did print up a notice a few years ago for some 757/767 refresher groundschool classes stating that a mandatory breath test was to be performed at 09:30 since the Refco was a part of pilot certification. 2 people were keen to have a quiet word before the day started. Best wind-up I've ever managed.