TL:DR explination of CA citizens arrest
California Penal Code mandates:
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. (C.P.C. 837).
California law allows citizens arrests when a citizen has reasonable cause for believing the person arrested to have committed a felony. In general, the arresting party must notify the suspect as to why he or she is being arrested, and may enter the building or private residence where the suspect is residing, using a reasonable amount of force to apprehend the suspect.
In California, for example,
"To make an arrest, a private person, if the offense is a felony may break open the door or window of the house in which the person to be arrested is, or in which they have reasonable grounds for believing the person to be, after having demanded admittance and explained the purpose for which admittance is desired. (C.P.C., 844). "
Once the suspect has been taken into custody (by the citizen), it is the citizens responsibility to deliver the suspect to the proper authorities in a timely fashion.
"A private person who has arrested another for the commission of a public offense must, without unnecessary delay, take the person arrested before a magistrate, or deliver him or her to a peace officer. (C.P.C. 847)."
bla bla bla...are you still awake?