Crossing a border.
Each country's border is focusing on certain issues. How much money do you have, proof that it's your money. Your travel ticket, when did you buy it, who paid for it. If someone else, who? why? They need logical answer they will accept.
If you have medicine, who's name, prescription and how much of it.
They are allowed to confiscate any suspension item and you can be prosecuted.
You don't have that much rights at this point. Just a thought.