Just look up knife laws in the California Penal Code on Findlaw and in any online set of city or county ordinances. It is a mishmash but the lowest common denominator / most widely legal knife would seem to be one with a blade of no longer than one inch. And of course no cane blades, switchblades, butterfly knives, etcetera.

Now go onto the website for any university, college, or school. Check out the rules for courthouses. Pretty unifomly zero knife tolerance.

Let's not even get started with TSA and federal law. Mr. Ritter has done a lot of good work in this area but it is far from permanently settled.

Finally, check the rules where you work, at the mall where you shop, etc.

So where are you going to be carrying your EDC when security or the local LEO asks ", Any knives?"

Edit: I EDC only a supposedly TSA-approved air carrier SAK whose only "blade" is a metal nail file a little over 2 inches long with no sharpened edges. It stills draws problems from time to time.