Gooose,
You have a very valid point. How will the judge know that page 13 snagging rule (in the mouth) has an expanded definition which is not written anywhere in the regs? Maybe the enforcement officers know the gill-plate forward rule and they won't ticket you unless they think you are trying to intentionally snag or line a fish. I am going to ask him about this scenario. I also have couple other question including Dan S. question. I will post when I get the answers.

YoungManRiver,
I am not aware of any regulations to discourage flossing in WA but I haven't read the entire rules either.

RK,
Gill-plate forward with no intend to snag is what I was told.
I think it comes down to the fact that the law can not be very black and white. For example as YoungManRiver said, if I see someone with a very long leader in a same stacked up pool casting and casting and casting ..., I may think that he is trying to line them. You can also line with shorter leaders but it is more difficult in deeper waters. That is where the enforcement officer has to make a judgement and decide what the "intention" is. It may become somewhat subjective. I usually know when I am lining a fish, I can feel it. If you know what you are doing is illegal and you care about being legal then don't do it. If you want to catch a fish at any cost, well, you have to live with it and also face the consequences if you get caught.