Ana
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Welcome to Australia, perhaps the only country in the world more litigious than the US! It's a CYA situation.
Very bright, it happens in the US also, I'm hoping to get a real reason why.
I can't believe it is a matter of liability, I think the operators in general get carried away and most of the people go along like good little lambs, is all about their "safety" so if someone doesn't go along with the silliness, then that person is either uneducated or just "an accident waiting to happen"
Not only is lame, but is not even efficient.
How can an operator KNOW for sure what is inside anyone's tanks?
I understand if the operator is supplying the gas but why go farther?