You fish with a lure with 2 or 3 treble hooks.
Fish grabs the lure and is hooked in the mouth by the tail hook, fish thrashes about as fish are known to do, and fish imbeds the 2nd and/or 3rd hook somewhere else on it's body....Isn't that what multiple treble hooks are supposed to do?
A foul hooked fish is a fish that is hooked anywhere else but it's mouth!
If there is any rule to the contrary, then it probably means that treble (and multiple treble) hooks are not acceptable for that state or derby.
Personally, I remove most of my trebles because they tend to do so much more damage to fish than a single hook.
I'm not advocating that trebles be banned, as that would be idiotic. I'm saying that I choose not to use them.
SO...logically if a lure has 2 or more trebles, and one is hooked in the mouth, then regardless of where the others end up that fish is NOT foul hooked.
(You can say it is, but that's a personal decision.)