A dagger is considered a knife with two sharpened edges, characteristically designed for thrusting. The thrust as primary design is key as we see knives with zero edges also considered illegal in TX (eg stilettoes etc) as they are weapons designed for the trust.
The Benchmade Adamas has a second edge that is serrated for use as a saw, not for stabbing things. However, if the bit of the spine between the saw and tip is sharpened it may be considered a dagger by the courts (the second sharpened edge has no specified minimum length). To play it safe you could grind down this bit.
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Your first concern is what Joe Cop will say, measure and decide if your going in. I have a pusher that was legal in a evil dark blue state but is illegal in Texas. Not illegal to "own" but illegal to "carry".
I believe his point is... even if the knife is legal, you might beat the rap but not the ride.