I suspect there is no way to actually stop someone from suing you, but the code does say that you should not be found guilty in a civil suit if you are found not guilty in a criminal suit.
Interestingly, this is only mentioned in the Protection Of Property part of the code. I do not see it in the other parts...Protection Of Self and Protection Of Others. Unless I'm missing something.
Here is the code, and a link to the exact spot on their web site:
TITLE 11
Crimes and Criminal Procedure
Delaware Criminal Code
CHAPTER 4. DEFENSES TO CRIMINAL LIABILITY
§ 466. Justification -- Use of force for the protection of property. (http://delcode.delaware.gov/title11/c004/index.shtml#466)
§ 466 Justification — Use of force for the protection of property.
(a) The use of force upon or toward the person of another is justifiable when the defendant believes that such force is immediately necessary:
(1) To prevent the commission of criminal trespass or burglary in a
building or upon real property in the defendant's possession or
in the possession of another person for whose protection the
defendant acts; or
(2) To prevent entry upon real property in the defendant's
possession or in the possession of another person for
whose protection the defendant acts; or
(3) To prevent theft, criminal mischief or any trespassory taking
of tangible, movable property in the defendant's possession
or in the possession of another person for whose protection
the defendant acts.
(b) The defendant may in the circumstances named in subsection (a) of this section use such force as the defendant believes is necessary to protect the threatened property, provided that the defendant first requests the person against whom force is used to desist from interference with the property, unless the defendant believes that:
(1) Such a request would be useless; or
(2) It would be dangerous to the defendant or another person
to make the request; or
(3) Substantial harm would be done to the physical condition
of the property which is sought to be protected before the
request could effectively be made.
(c) The use of deadly force for the protection of property is justifiable only if the defendant believes that:
(1) The person against whom the force is used is attempting
to dispossess the defendant of the defendant's dwelling
otherwise than under a claim of right to its possession; or
(2) The person against whom the deadly force is used is
attempting to commit arson, burglary, robbery or
felonious theft or property destruction and either:
a. Had employed or threatened deadly force against or
in the presence of the defendant; or
b. Under the circumstances existing at the time, the
defendant believed the use of force other than deadly
force would expose the defendant, or another person
in the defendant's presence, to the reasonable
likelihood of serious physical injury.
(d) Where a person has used force for the protection of property and has not been convicted for any crime or offense connected with that use of force, such person shall not be liable for damages or be otherwise civilly liable to the one against whom such force was used.