Oklahoma has the "make my day law" that pretty much lets you shoot someone if they're messing with you on your property and protects people from any criminal charge or civil suit if they use force (which includes deadly force) against an invader of the home.
If you do go to court, a good lawyer can defend your case as a justifiable homicide. Of course that doesn't mean you can just shoot anyone that trespasses on your property. You have to be able to prove that the intention of the intruder was a malicious one.
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