"12020 (4) Carries concealed upon his or her person any dirk or dagger.
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(24) As used in this section, a "dirk" or "dagger" means a knife or other instrument with or without a handguard that is capable of ready use as a stabbing weapon that may inflict great bodily injury or death. A nonlocking folding knife, a folding knife that is not prohibited by Section 653k, or a pocketknife is capable of ready use as a stabbing weapon that may inflict great bodily injury or death only if the blade of the knife is exposed and locked into position.
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25(d) Knives carried in sheaths which are worn openly suspended from the waist of the wearer are not concealed within the meaning of this section."
2dogs: I am aware of the "ready use as a stabbing weapon" part, but it seems to be more geared towards defining what a dirk or dagger is, which would include fixed blades and folding blades with the blade locked open. It seems to be giving a case for when a folding knife is considered a concealed weapon if the blade is locked open, so therefore a fixed blade is always considered a concealed weapon because it is in a configuration that it is always readily able to be used as a stabbing weapon.
I could see were your lawyer could argue that since it was in the bottom of your bag, it is not ready to be used as a stab implement, but that may or may not work. I could strap a knife to my thigh underneath my pants and make the same argument, since my jeans are tight, that it is not easy for me to access the knife, but I guarantee you I would get convicted for carrying a concealed weapon. I see were your argument could and should work, but given the wrong judge and arresting officer you could get convicted anyway.
Maybe I don't know the law as well as you do, but from looking at the penal code I would rather have my knife on my belt than have an LEO and judge misinterpret the intent of the law, and throw me in jail.
I didn't know if you had ever read the penal codes, that's why I pointed it out, no need to get defensive. There are a lot of misconceptions about California law, especially when it comes to knives and guns, even LEOs don't always know the laws, it's hard to know who has actually read the laws, and who hasn't, that's why I pointed it out.