.
......Whilst parked it is subject to the law of the land it is sat upon........
Seem to remember that that was the situation regarding drinking before flying, which used to be 8 hours Bottle to Throttle in some countries, 12 in others and, if memory serves me, 24 in India, (?) so on a 24 hr. 'slip pattern' one couldn't have a beer at all during the stopover, nothing to do with blood alcohol levels - straight legislation of the country one had landed in, nothing to do with the State of Registration of the aircraft one was flying out.