Legal Question in Criminal Law in Tennessee

This is actually quite a complicated issue. First of all, if the person was on the property without the owner's permission, then the owner can sue the person for trespass. From the facts you give it also sounds like the owner could sue for invasion of privacy. However, as for the evidence to be used in court, unfortunately the Constitution only protects people from government intrustion and not individuals. Therefore, the evidence, while illegally obtained, would likely still be able to be used in court. Now, if those were officers who obtained that evidence, you could get that excluded if there was no search warrant.