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Here's how it is in Texas:
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http://www.capitol.state.tx.us/statutes/docs/PE/content/htm/pe.002.00.000009.00.htm

SUBCHAPTER D. PROTECTION OF PROPERTY

§ 9.41. PROTECTION OF ONE'S OWN PROPERTY. (a) A person
in lawful possession of land or tangible, movable property is
justified in using force against another when and to the degree the
actor reasonably believes the force is immediately necessary to
prevent or terminate the other's trespass on the land or unlawful
interference with the property.
(b) A person unlawfully dispossessed of land or tangible,
movable property by another is justified in using force against the
other when and to the degree the actor reasonably believes the force
is immediately necessary to reenter the land or recover the
property if the actor uses the force immediately or in fresh pursuit
after the dispossession and:
(1) the actor reasonably believes the other had no
claim of right when he dispossessed the actor; or
(2) the other accomplished the dispossession by using
force, threat, or fraud against the actor.

Acts 1973, 63rd Leg., p. 883, ch. 399, § 1, eff. Jan. 1, 1974.
Amended by Acts 1993, 73rd Leg., ch. 900, § 1.01, eff. Sept. 1,
1994.

§ 9.42. DEADLY FORCE TO PROTECT PROPERTY. A person is
justified in using deadly force against another to protect land or
tangible, movable property:
(1) if he would be justified in using force against the
other under Section 9.41; and
(2) when and to the degree he reasonably believes the
deadly force is immediately necessary:
(A) to prevent the other's imminent commission of
arson, burglary, robbery, aggravated robbery, theft during the
nighttime, or criminal mischief during the nighttime; or
(B) to prevent the other who is fleeing
immediately after committing burglary, robbery, aggravated
robbery, or theft during the nighttime from escaping with the
property; and
(3) he reasonably believes that:
(A) the land or property cannot be protected or
recovered by any other means; or
(B) the use of force other than deadly force to
protect or recover the land or property would expose the actor or
another to a substantial risk of death or serious bodily injury.

Acts 1973, 63rd Leg., p. 883, ch. 399, § 1, eff. Jan. 1, 1974.
Amended by Acts 1993, 73rd Leg., ch. 900, § 1.01, eff. Sept. 1,
1994.

§ 9.43. PROTECTION OF THIRD PERSON'S PROPERTY. A person
is justified in using force or deadly force against another to
protect land or tangible, movable property of a third person if,
under the circumstances as he reasonably believes them to be, the
actor would be justified under Section 9.41 or 9.42 in using force
or deadly force to protect his own land or property and:
(1) the actor reasonably believes the unlawful
interference constitutes attempted or consummated theft of or
criminal mischief to the tangible, movable property; or
(2) the actor reasonably believes that:
(A) the third person has requested his protection
of the land or property;
(B) he has a legal duty to protect the third
person's land or property; or
(C) the third person whose land or property he
uses force or deadly force to protect is the actor's spouse, parent,
or child, resides with the actor, or is under the actor's care.

Acts 1973, 63rd Leg., p. 883, ch. 399, § 1, eff. Jan. 1, 1974.
Amended by Acts 1993, 73rd Leg., ch. 900, § 1.01, eff. Sept. 1,
1994.

§ 9.44. USE OF DEVICE TO PROTECT PROPERTY. The
justification afforded by Sections 9.41 and 9.43 applies to the use
of a device to protect land or tangible, movable property if:
(1) the device is not designed to cause, or known by
the actor to create a substantial risk of causing, death or serious
bodily injury; and
(2) use of the device is reasonable under all the
circumstances as the actor reasonably believes them to be when he
installs the device.

Acts 1973, 63rd Leg., p. 883, ch. 399, § 1, eff. Jan. 1, 1974.
Amended by Acts 1975, 64th Leg., p. 913, ch. 342, § 6, eff. Sept.
1, 1975. Acts 1993, 73rd Leg., ch. 900, § 1.01, eff. Sept. 1,
1994.