No one is saying warnings are required. I said I expected one was given, because 1) it appears to be the common practice, and 2) it is the reasonable thing to do. So I doubt that this person would have been fined without a warning, but indeed, I have no way of knowing. That said, I'm open to the idea that perhaps the law should stipulate a warning, but perhaps the language around proportionality/reasonableness is sufficient.
