Jim if you're going to go around talking about doing your homework, you might want to start with your English homework...
http://www.merriam-webster.com/dictionary/furtive
"Furtive" means "secretly", "stealthy"... You know, like strapping a knife to your ankle so it cannot be seen. Feel free to look up more defintiions of the word for yourself.
Secondly: A dagger is defined as a double-edged knife. Knives with sharpened clip points are illegal in Washington state because of this. I've asked several LEO on this matter, what is your source?
Further, for the matter of interpertation... You're walking a fine line here. I actually asked some LEOs this exactly question, whether it depends on context of if it is simply concealed. The grand majority of them ( granted they were not Wasghinton State LEOs) stated clearly that context does not matter, because they don't know if you just had your shirt untucked or if you were trying to sneak the weapon around.
In quite contradictory fashion though, I communicated with the Attorney General for Washington State and he said that he was not aware of any case that argued the language of the statute... Posted all about it in Knife Laws forum. In fact I think I even posted the LEOs opinions on this--I asked them on a forum where there is a section for civillians to ask real cops questions, and the site verifies officers so I have no doubt they are legitimately police officers.
http://www.realpolice.net/forums/ask-cop-112/ You can view my questions on there ( same name as here ) and I'd suggest you ask yourself there as you are as of now painfully ill-informed.
If you were pulled over, and for some reason told a cop you had your TDI on you for "self-defense" he would be well within the law to arrest you and from everything I've researched most LEOs would consider it a good arrest. I think it's time for a review. Meanwhile, I've asked LEOs if having a "neck knife" under a shirt would be considered concealed and they all agree it would, so due to your confusion of the language you've been unaware for quite some time you're illegally carrying a knife.
http://www.bladeforums.com/forums/s...oncealment-in-Washington-state-letter-from-AG
Meanwhile, you say you have PTSD and other mental issues? Hey me too! You ever notice outside your doctors office, it has a sign that has "No Weapons" but then the picture it uses is a revolver, with a circle and slash through it? Down at the bottom of that sticker is usually "RCW 9.41.300". You should really pay attention if the sign your school posted has this statute number written on it, or if it is just their own private policy, city ordinance, etc. These signs are not very good at specifying "gun" from "knife" so you really shouldn't trust them to.
Here's the real problem though when it comes to RCW 9.41.280,
http://apps.leg.wa.gov/rcw/default.aspx?cite=9.41.280
Which brings us back to
http://apps.leg.wa.gov/rcw/default.aspx?cite=9.41.250
Where once again, carrying your TDI on your ankle concealed, violates section 1b of.
One part that's unfortunately so ill-defeined is "dangerous weapon". In my research, I've been able to find these articles in relation to that information...
So there is a lot to suggest ( but not define ) a deadly weapon as any knife over 3" of length in Washington state, and the question of whether intent makes it a deadly weapon or not. Meanwhile you're concealing it, and doing so on a school property.
So in reality you haven't been nearly as law abiding as you think.
Now personally, my therapist's office has a "no weapons" sign posted outside, I know it includes my knife. I take it inside anyway. I've been seeing them for years, and never ever once had a problem. One time my therapist saw my knife, I forget how or why but all she said was "Oh, well, keep that in your pocket and don't let the girls up front see it." Another time at my primary care provider's office, I lent it to a maintenance guy instlaling some new duct work.
The only time any one has EVER said a thing about my knfie was at a local pizza shop. I had it clipped to my shirt with a tek-lok, I was moving into a new place and this was convenient for me, and I decided to take a break and get dinner--forgetting about the knife. This was after the Aurora shooting in Colorado, and the guy who took my order at the counter commented, "Your probably shouldn't carry your knife around on your shirt like that after what happened in Denver..." I simply asked him, "Oh, I wasn't aware you had a policy, would you like me to leave?" You know oddly, the guy seemed to want my buisness and shut right up and I didn't get the cops called on me. Go figure.
Meanwhile, even if you went to something like the county clerk's office, obviously I left my knife in the car knowing they don't want it in there. Accidentally forgot my pepper-spray, and they actually had a locker to store it in. I asked and apparently if you did take your firearm or whatever into area, they have a locker where you can store it before going further. No alarms were raised, the cop was actually interested in the brand and asked me about it.
Granted I live on the East side. After watching a Seattle cop shoot a guy in the back for carving with a 3" folding knife, I would probably err on the side of caution over there as well.
Edit:
Speaking of Seattle, you don't happen to live there do you? Because city municipal code bans fixed blades of any length--actually this is so in a lot of places on the West side. Once again, Washington knife laws are
full of ambiguity.