Thanks for your reply. They're not bad people. If I say not onboard I beleive they will respect that.
If it's not this trip it could happen another time so I want to know where I would stand as captain in the BVI. I know the rules in the USA and have no problem making my rules clear if I think there might be a problem with someone.
Based on the information in your post, if someone were caught onboard with pot it would be their problem alone, and not mine. Could this be correct?