In law, an absolute defense is a factual circumstance or argument that, if proven, will end the litigation in favor of the defendant. The concept of an absolute defense is not a rigid one. Statutes frequently use the term merely as a synonym to "full" or "complete". It is more often used, however, as a term of art in both criminal and civil law to refer to an underlying set of facts and laws, not raised by the complaint or indictment, which will require the defendant's dismissal even if the factual allegations of the complaining pleading are true. Another characteristic of an absolute defense is that, once it is pleaded and proven, it is not subject to mitigation or collateral attack. Examples of absolute defenses include
Truth of an allegedly libelous statement : a person cannot be made to pay damages for a defamatory statement, if the person can show that the statement is true. This is the case in some jurisdictions, including the United States, but not in others, including England and Wales and Australia.
Self-defense in a battery case: a person cannot be held criminally liable for battery if they can prove Right of self-defense under certain circumstances.
Immunity of various kinds can provide an absolute defense. Probably the strongest of these is sovereign immunity—this is the common law doctrine, followed in many jurisdictions, that the state cannot be sued unless it agrees to waive its immunity, usually by legislation allowing specific claims to be brought.
Use of the word "absolute" sometimes causes confusion, because even in the law "absolute" is sometimes used simply as a synonym for "full" or "complete". As a term or art, however, there are many complete defenses which are not customarily called absolute. Most notably, innocence, while a complete defense to a criminal charge, is not generally termed "absolute", because it involves a material fact of the pleading. On the other hand, double jeopardy is more likely to be termed an absolute defense; an indictment or does not have to state that the defendant has not previously been tried on the crime, but once a defendant shows that he has been previously tried for a crime, his dismissal is required by the US Constitution. Both an absolute defense and a complete defense must be distinguished from a partial defense. With a partial defense, the litigant hopes to mitigate the outcome of the litigation, or limit culpability, but the liability is not eliminated. Examples include diminished capacity to understand the wrongfulness of the action, or a mistake of fact that affected the intention of the litigant.
