Originally Posted by
newgroundhogbrit
As I say - not an expert - just relaying the Spanish advice. As for blue channel stops - me, last week, return to UK from AMS - must have fitted some profile or other for the day. Either that or they were really, really, bored.
Just an assumption, but I would suspect that is more down to coming back from Amsterdam. A spot check or two to discourage folk from bringing back anything 'herbal'.