I have actually done a great deal of research into different states laws pertaining to bladed weapons, and as said above, it is all about perception of use.
All states allow exemptions for use. All states (that I have seen) also say in every law that it is very clearly about perception of use, and nearly every law states "with the intent of using it against your fellow man".
This being said. Even if you know you are legally in the right, that does not stop police officers or even ADA's or SDA's from prosecuting you and making your life hell in court.
What many people fail to realize is that even though your particular cause may be able to be won in court, that doesn't mean that a ADA (District attorney) or SDA (state attorney) will not try to make a name by challenging it.
Laws are created by precedents, not by the law on record, meaning they are always changing based on the circumstance.
Yes you may be in the right, but do you you want to have to hire a lawyer and spend 5 years in court?
I myself carry 2 knives on me at all times, even outside the states, as I would rather defend myself in court and feel safe on the streets than rely on the cops.
Again, it all goes to perception of use.
All knives you carry on your persons (in my opinion, and remember, you will have to convince 12 people (or not maybe) that you are carrying this knife not with the anticipation of using it against others) should be also easily considered a utilitarian knife.
Just remember, how easy is it going to be to convince a jury of your peers (most likely people that are not knife/weapon understanding people) that you are not carrying this knife with the intention of using it against others.
This is why you shouldn't in my opinion carry overly cool looking knives or tactical looking knives for defence purposes.