if the pilot in question WAS over the limit the CPS would have him bang to rights and he would be prosecuted
I presume that someone thought he was over the limit, called the police, they rolled up and arrested him , removed him from the 'plane and only then tested him.... at which point it all became a little embarrassing as he wasn't over the limit
= buck passing on the usual scale
On the other hand he shouldn't have been anywhere near booze for at least 8 hours before flying so if he had had one (or two) he was playing with fire