Carrying a Dirk or Dagger — CA Penal Code 21310 PC
In Penal Code 21310 PC, California law makes it a crime to carry a dirk or dagger in public if it is concealed. In this video, a former Los Angeles deputy district attorney discusses the laws, penalties and legal defenses.
Penal Code 16470 PC defines dirks or daggers as:
1. a knife or other instrument,
2. with or without a hand guard,
3. that is capable of ready use as a stabbing weapon, and
4. that may inflict a significant or substantial physical injury or death.
More info at http://www.shouselaw.com/dirk-dagger.html