Your mention of Texas law got me to thinking. I looked up the blade size limitations for my state (Utah). This is the relevent passage from the Utah ciminal code:

(5) (a) "Dangerous weapon" means any item that in the manner of its use or intended use is capable of causing death or serious bodily injury. The following factors shall be used in determining whether a knife, or any other item, object, or thing not commonly known as a dangerous weapon is a dangerous weapon:
(i) the character of the instrument, object, or thing;
(ii) the character of the wound produced, if any;
(iii) the manner in which the instrument, object, or thing was used; and
(iv) the other lawful purposes for which the instrument, object, or thing may be used.

That's it. No blade size mentioned at all! It seems to be saying that, unless I am walking around with Orcrist Goblin-Cleaver stuck down my trousers, then I am perfectly legal. I find it fascinating that they left it so deliberately vague. I would love to have a lawyer chime in on this.

Regards, Vince