What does "affirmative defense" require from the defendant?

An affirmative defense is a specific type of defense used in legal cases where the defendant acknowledges that they committed the act but seeks to avoid liability by providing a valid justification or excuse. This typically requires the defendant to present some evidence that supports their claim. The burden shifts to the defendant to prove this defense, which means they must offer facts or evidence that demonstrate their justification for the act committed.

In this context, the requirement for "some evidence thereon" is essential because it signifies that simply claiming an affirmative defense is not sufficient; the defendant must substantiate that claim with appropriate evidence or documentation. This could include testimony, physical evidence, or any other form of proof that aligns with the affirmative defense being presented.

The other choices do not accurately represent the requirement of an affirmative defense. An alibi, while a valid defense in some contexts, specifically asserts that the defendant was in a different location during the commission of the act and does not necessarily serve as an affirmative defense by itself. A positive polygraph result may be seen as evidence but is not universally accepted in court as definitive proof of truthfulness or innocence. Lastly, stating "none of the above" does not correctly address the nature of an affirmative defense and the essential requirement of providing some evidence to support