Section 837 Of Chapter 5. Arrest, By Whom And How Made From California Penal Code >> Title 3. >> Part 2. >> Chapter 5.

. A private person may arrest another: 1. For a public offense committed or attempted in his presence. 2. When the person arrested has committed a felony, although not in his presence. 3. When a felony has been in fact committed, and he has reasonable cause for believing the person arrested to have committed it.