One2gofst, the applicable section of the Ohio Revised Code is 2923.11:
"(A) 'Deadly weapon' means any instrument, device or thing capable of inflicting death, and DESIGNED or specially adapted for use as a weapon, or possessed, carried, or used as a weapon." (emphasis mine)
The ORC section on concealment is 2923.12:
"(A) No person shall knowingly carry or have, concealed on his or her person or concealed ready at hand, any deadly weapon or dangerous ordnance."
I used to worry a bit about my BM Ascent, seeing as how the blade design was essentially the same as the AFCK ("Advanced Folding 'CAMPING'

Knife"). However, I got over that, since even the AFCK would mostly be used for utility purposes, and nothing about the blade shape seemed to indicate a "weapon only" design. Furthermore, it would take a really motivated, knife-design educated cop to recognize the Ascent's heritage, etc. "Tactical folders" may be "tactical," but they are primarily used as tools, not weapons.
I'm not so sure about the Matriarch though. The tag provided with it saying that utility use will invalidate the warranty, plus its exclusion from the Spyderco website (if I'm not mistaken, at least the picture is not there), plus it's derivation from the Civilian, PLUS all the info which could be gotten off Bladeforums and other places...
If someone really wanted to bust me with a Matriarch, I think they could do it, and I wouldn't be backed up by "all the evidence." As for "concealment," I don't think it is ever defined in the ORC. There may be trouble with that, depending on the LEO who wants to be a little criminal-loving Taft clone. Maybe I should try to look up case law on that?
If you can get a statement from the Ohio Attorney General's office that it's okay to carry a pocketclipped Matriarch, I would be thrilled to carry it when I wished. However, my experiences with asking questions of "my betters" here in Ohio is not good. Often, no one has gotten back to me or I was given the royal runaround. No one wants to put their a** on the line for a citizen question regarding self-defense, I suppose. You never know who I will go out and kill.
I am pretty comfy carrying my Sifu unless I am going somewhere "iffy," like the statehouse. The Sifu is a BF special edition, and is marked so. It is a "collectable" and I like to show it around to people (no, not strangers in elevators

). The blade is large and black ti coated, but I think I could defend it. Not so the Matriarch. Until I see case law accepting the Gunting as a "less than lethal weapon" I would say the same for it, unfortunately.
Keep in mind at some point in the future I will completely ignore Ohio's unconstitutional, immoral, illegal, and unjust, discriminatory, criminal aiding and abetting laws against the good guys going armed with a concealed weapon. And when I do, it will be with a handgun, not a knife.
This is just my layman's take on the ORC and the crap we have to deal with here in Tyrant Taft's criminally oriented la la land.
Mike, I've thought about seatbelt cutting, and I will someday (yeah, yeah, "someday"

) mount my CRKT safety tip Bear Claw in my K-car just for that purpose. Maybe two of them...
Karl