Down here in Hampshire, our club strip gets a visitation from uniformed customs and excise officers every few months. They've never thankfully asked any of us what we're up to, more worried about any strange aeroplanes we didn't recognise.
Conversely, a while ago a friend who runs an airfield in ***** which is not to long a hop from the Netherlands, rang me up worried about a very suspicious pilot who had tried to sell drugs to somebody on the airfield, and threatened anybody who asked searching questions with violence. As a favour I had a word with CAA enforcement branch, who promised to talk to the relevant bit of the police. According to my friend, they seem to have done absolutely )(*(*!!! all.
It's all about being seen to be doing something isn't it, rather than actually doing something.
G