Defendants use a range of defense strategies to counter the plaintiff's case. Alibi defense involves presenting evidence that the defendant was not present at the scene of the crime during its occurrence. Self-defense claims argue that the defendant's actions were necessary to protect themselves or others from harm. The insanity defense asserts that the defendant lacked the mental capacity to understand the wrongfulness of their actions. Challenging the sufficiency or reliability of the plaintiff's evidence is another strategy used to cast doubt on the defendant's guilt.