What are the California laws on butterfly knives?

I've read the California knife laws, and it does not directly reference butterfly knives. If butterfly knives are in fact illegal, what about a training knife? Are they legal? I just want to play with one around my house because they are fun.|||Butterfly knives are illegal in Calif., they are in the same classification as switchblades, stupid laws. Go ahead and play with it around the house, just don't let anyone see it.