I live in California too and the only thing I'd be uncomfortable passing is a balisong/butterfuly knife or automatic/switchblade. Both are illegal for regular citizens to carry around in their possession. LEOs and active military can legally posess autos, and collectors like us can own them in our homes, but can't carry them around.
I would never recommend a passaround involving a butterfly or auto, but other knives should be fine.
Now, there may be some knife-oriented law about what type of weapon a convicted felon may or may have in his/her possession, that would be something I'd recommend looking into. If in doubt, don't do it.