The problem in CA is that individual police officers often don't know the exact details of the knife laws. Some policemen do - but many don't. Some may insist that the blade you are carrying is illegal and ask you to turn it over - even when your folder is legal. My suggestion is to comply with their request if they make a big deal about it, and ask for a receipt - you should be able to get it back in due course. And you're right - switchblades, balisong knives and spring knives are not permitted.

Pete2