At a port of entry, your rights are few. It is like knocking on someone's door and asking to come in: it is completely within their right to look at you and everything you propose to bring into their house before they allow entry.
If they cause damage in doing so, they are financially responsible for that.
We do similar at US ports of entry. If a country can not determine who and what enters, do they really have sovereinty?
Oh, and smugglers aren't stupid; if they realize thet grandma types aren't being checked, then they will use those types until they start getting popped again.
God gave you a soul.
Your parents, a body.
Your country, a rifle.
Keep all of them clean.