My cousin is flying into Amsterdam where she’ll stay for a few days, then will be taking a ferry to the UK. She wants to bring a small amount (< 5g) of cannabis with her for personal use. I’ve tried explaining why this is a bad idea, but she wants proof. I haven’t found anything concrete online, mostly vague claims (invariably from pro-smoking sites) that it would probably not even be confiscated at the border and that the worst that could happen is an on-the-spot fine. However, the UK customs site clearly states that this is illegal. What penalties could she actually be facing? How likely is a tough sentence (she’s an American)?
(Please note that I am not seeking legal advice, merely information from somebody with better Googling skills than myself. I am also not condoning illegal activities - in fact I hope to prevent one.)