I fly between Toronto-Heathrow-Oslo-Amsterdam-Brussels-Geneva-Frankfurt-Dubai-Manama-Doha-Riyadh et all. And I've been stopped everytime and queried.
Except once in Kuala Lumpur, when the juice was confiscated, I've been let go after a severe tête-à-tête. It's another matter that a few times the SOs got intrigued and were eager to have their own! US ports are pretty conducive lately - but some of Canadian ones aren't. I had some difficult time/s in Montreal as well.
The problem is in the hassle - the time wasted in unnecessary conversations. I now carry a 21mm flashlight along with my mods and the juices in labeled OTC medicine bottles. However, one of those 510 flashlight heads could be pretty handy... less intruding.
Hope our fav modder -
Perseas - comes to our rescue, soon (hint

), else I might have to develop one of my own!