Truth, or substantial truth, is a complete defense to a claim of defamation.
In California, a claim for defamation involves a false statement made by one person about another person, which causes harm to a person's property, business, profession or occupation.
Defamation is an invasion of the interest in reputation. It may be libel or slander. (California Civil section 44; herein, “Civ. Code § __.”) The tort involves (a) a publication that is (b) false, (c) defamatory, and (d) unprivileged, and that (e) has a natural tendency to injure or that causes special damage.
The most common defenses to defamation are: 1) truth; 2) consent; 3) privilege; and 4) the statute of limitations. Perhaps the most distinct aspect of the defamation cause of action is that falsity is required. In other words, the statement publicized about the plaintiff must be false in order to prove defamation.
Defamation Per Se Under California Defamation Law In most California slander and libel cases, plaintiffs must prove how the communications under review caused material harm — except in per se lawsuits. A statement is considered defamatory per se if harm to the victim is inherent.
In cases involving public figures or matters of public concern, the burden is on you to prove falsity. In cases involving matters of purely private concern, the burden of proving the truth is on the defendant. A defendant does not have to show the literal truth of every word in an alleged defamatory statement.
California, though, is not one of the U.S. states with criminal defamation laws. While California defamation defendants do not face potential imprisonment, they could be subject to civil lawsuits and hefty damages (including punitive damages), depending on the nature and harm caused by their false statements.