837. 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.
 
838. A magistrate may orally order a peace officer or private
person to arrest any one committing or attempting to commit a public
offense in the presence of such magistrate.
 
839. Any person making an arrest may orally summon as many persons
as he deems necessary to aid him therein.
 
840. An arrest for the commission of a felony may be made on any
day and at any time of the day or night. An arrest for the
commission of a misdemeanor or an infraction cannot be made between
the hours of 10 o'clock p.m. of any day and 6 o'clock a.m. of the
succeeding day, unless:
 (1) The arrest is made without a warrant pursuant to Section 836
or 837.
 (2) The arrest is made in a public place.
 (3) The arrest is made when the person is in custody pursuant to
another lawful arrest.
 (4) The arrest is made pursuant to a warrant which, for good cause
shown, directs that it may be served at any time of the day or
night.
 
841. The person making the arrest must inform the person to be
arrested of the intention to arrest him, of the cause of the arrest,
and the authority to make it, except when the person making the
arrest has reasonable cause to believe that the person to be arrested
is actually engaged in the commission of or an attempt to commit an
offense, or the person to be arrested is pursued immediately after
its commission, or after an escape.
 The person making the arrest must, on request of the person he is
arresting, inform the latter of the offense for which he is being
arrested.
 
841.5. (a) Except as otherwise required by Chapter 10 (commencing
with Section 1054) of Title 7, or by the United States Constitution
or the California Constitution, no law enforcement officer or
employee of a law enforcement agency shall disclose to any arrested
person, or to any person who may be a defendant in a criminal action,
the address or telephone number of any person who is a victim or
witness in the alleged offense.
 (b) Nothing in this section shall impair or interfere with the
right of a defendant to obtain information necessary for the
preparation of his or her defense through the discovery process.
  (c) Nothing in this section shall impair or interfere with the
right of an attorney to obtain the address or telephone number of any
person who is a victim of, or a witness to, an alleged offense where
a client of that attorney has been arrested for, or may be a
defendant in, a criminal action related to the alleged offense.
 (d) Nothing in this section shall preclude a law enforcement
agency from releasing the entire contents of an accident report as
required by Section 20012 of the Vehicle Code.
 
842. An arrest by a peace officer acting under a warrant is lawful
even though the officer does not have the warrant in his possession
at the time of the arrest, but if the person arrested so requests it,
the warrant shall be shown to him as soon as practicable.
 
843. When the arrest is being made by an officer under the
authority of a warrant, after information of the intention to make
the arrest, if the person to be arrested either flees or forcibly
resists, the officer may use all necessary means to effect the
arrest.
 
844. To make an arrest, a private person, if the offense is a
felony, and in all cases a peace officer, 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.
 
845. Any person who has lawfully entered a house for the purpose of
making an arrest, may break open the door or window thereof if
detained therein, when necessary for the purpose of liberating
himself, and an officer may do the same, when necessary for the
purpose of liberating a person who, acting in his aid, lawfully
entered for the purpose of making an arrest, and is detained therein.
 
846. Any person making an arrest may take from the person arrested
all offensive weapons which he may have about his person, and must
deliver them to the magistrate before whom he is taken.